Pub Date : 1999-03-01DOI: 10.1080/07060661.1999.10600132
R. Mathiasen
Abstract Subalpine fir (Abies Lasiocarpa (Hook.) Nutt.) and Rocky Mountain subalpine fir (Abies bifolia A. Murr.) are more susceptible to infection by Douglas-fir dwarf mistletoe (Arceuthobium douglasii Engelm.) than previously reported. Temporary circular plots (6-m radius) were established around dominant, severely infected Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco). Within plots, species, diameter at 1.37 m above the ground, and dwarf mistletoe rating (6-class system) were determined for each live tree over 1.37 m in height. Sixty-six percent and 15% of the subalpine fir and Rocky Mountain subalpine fir, respectively, sampled near large, severely infected Douglas-fir were infected. In contrast, over 90% of the Douglas-fir in the same plots were infected. Based on these results, subalpine fir is classified as a secondary host of Douglas-fir dwarf mistletoe and Rocky Mountain subalpine fir is classified as an occasional host. Variation in the infection of subalpine fir by Douglas-fir dwarf mistle...
{"title":"Comparative susceptibility of subalpine firs to Douglas-fir dwarf mistletoe","authors":"R. Mathiasen","doi":"10.1080/07060661.1999.10600132","DOIUrl":"https://doi.org/10.1080/07060661.1999.10600132","url":null,"abstract":"Abstract Subalpine fir (Abies Lasiocarpa (Hook.) Nutt.) and Rocky Mountain subalpine fir (Abies bifolia A. Murr.) are more susceptible to infection by Douglas-fir dwarf mistletoe (Arceuthobium douglasii Engelm.) than previously reported. Temporary circular plots (6-m radius) were established around dominant, severely infected Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco). Within plots, species, diameter at 1.37 m above the ground, and dwarf mistletoe rating (6-class system) were determined for each live tree over 1.37 m in height. Sixty-six percent and 15% of the subalpine fir and Rocky Mountain subalpine fir, respectively, sampled near large, severely infected Douglas-fir were infected. In contrast, over 90% of the Douglas-fir in the same plots were infected. Based on these results, subalpine fir is classified as a secondary host of Douglas-fir dwarf mistletoe and Rocky Mountain subalpine fir is classified as an occasional host. Variation in the infection of subalpine fir by Douglas-fir dwarf mistle...","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81559610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-03-01DOI: 10.1080/07060661.1999.10600114
J. B. Heale, V. Karapapa
Abstract Verticillium wilt of winter oilseed rape (Brassica napus subsp. oleifera), reported previously as being caused by Verticillium dahliae Klebahn, or V. dahliae var. longisporum Stark, 1961, has caused serious economic losses in Sweden since 1960 and is now widespread in Europe. We have recently fully characterized and reclassified this host-adapted, near-diploid pathogen at the species level: Verticillium longisporum comb. nov. (Karapapa, Bainbridge, and Heale. 1997. Mycol. Res. 101: 1281–1294, and Karapapa, Bainbridge, and Heale. 7th International Verticillium Symposium, Cape Sounion, Athens, Greece, Oct. 1997. Abstr. p. 12). This pathogen causes yield losses, both in oilseed rape and related Brassica, in Europe, Asia, and Japan, but has not yet been reported on the U.K. oilseed rape crop or on the Canadian canola crop. Verticillium wilt in cauliflower in California, reported in 1994–1995 as involving a relatively large-spored V. dahliae with high nuclear DNA content, may be the first evidence of ...
摘要/ Abstract摘要:冬季油菜黄萎病的研究。先前报道的由大百合黄萎病(Verticillium dahliae Klebahn，或V. dahliae var. longisporum Stark, 1961)引起的油油病，自1960年以来在瑞典造成了严重的经济损失，现在在欧洲广泛传播。我们最近在物种水平上完全表征和重新分类了这种适应宿主的近二二体病原体:长孢黄萎病梳状体。11月(Karapapa, Bainbridge和Heale, 1997)。Mycol。Res. 101: 1281-1294，和Karapapa, Bainbridge, and Heale.第七届国际黄萎病研讨会，苏尼翁角，希腊雅典，1997年10月。Abstr。12页)。这种病原菌在欧洲、亚洲和日本的油菜和相关的芸苔属植物中造成产量损失，但在英国的油菜作物或加拿大的油菜籽作物中尚未报道。1994-1995年报道的加州花椰菜黄萎病涉及一种核DNA含量高、孢子较大的dahliae，这可能是黄萎病的第一个证据。
{"title":"The verticillium threat to canada’s major oilseed crop: canola","authors":"J. B. Heale, V. Karapapa","doi":"10.1080/07060661.1999.10600114","DOIUrl":"https://doi.org/10.1080/07060661.1999.10600114","url":null,"abstract":"Abstract Verticillium wilt of winter oilseed rape (Brassica napus subsp. oleifera), reported previously as being caused by Verticillium dahliae Klebahn, or V. dahliae var. longisporum Stark, 1961, has caused serious economic losses in Sweden since 1960 and is now widespread in Europe. We have recently fully characterized and reclassified this host-adapted, near-diploid pathogen at the species level: Verticillium longisporum comb. nov. (Karapapa, Bainbridge, and Heale. 1997. Mycol. Res. 101: 1281–1294, and Karapapa, Bainbridge, and Heale. 7th International Verticillium Symposium, Cape Sounion, Athens, Greece, Oct. 1997. Abstr. p. 12). This pathogen causes yield losses, both in oilseed rape and related Brassica, in Europe, Asia, and Japan, but has not yet been reported on the U.K. oilseed rape crop or on the Canadian canola crop. Verticillium wilt in cauliflower in California, reported in 1994–1995 as involving a relatively large-spored V. dahliae with high nuclear DNA content, may be the first evidence of ...","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89423359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-03-01DOI: 10.1080/07060661.1999.10600116
G. Chongo, C. C. Bernier, L. Buchwaldt
Abstract Partial resistance and fungicide applications were evaluated in 1995 and 1996 for control of anthracnose in lentil (Lens culinaris) caused by Colletotrichum truncatum. Line 458-57 (partially resistant) and cv. Eston (susceptible) were planted in fields with a history of low, partial, and high anthracnose pressures. Unsprayed plots were compared with plots receiving a single application of either I or 2 kg a. i./ha of chlorothalonil at the 10- to 12-node stage, and two applications of 1 kg a.i./ha at the 10- to 12-node stage and to days later. Anthracnose severity in unsprayed plots was highest (78% for cv. Eston and 62% for 458-57) at high disease pressure, intermediate (62% for cv. Eston and 46% for 458-57) at partial disease pressure, and lowest (26% for cv. Eston and 15% for 458-57) at low disease pressure. Yield losses in unsprayed plots ranged from 26 to 57% in cv. Eston and 20 to 28% in 458-57, with the most significant losses occurring in cv. Eston at high disease pressure. Applications of...
{"title":"Control of anthracnose in lentil using partial resistance and fungicide applications","authors":"G. Chongo, C. C. Bernier, L. Buchwaldt","doi":"10.1080/07060661.1999.10600116","DOIUrl":"https://doi.org/10.1080/07060661.1999.10600116","url":null,"abstract":"Abstract Partial resistance and fungicide applications were evaluated in 1995 and 1996 for control of anthracnose in lentil (Lens culinaris) caused by Colletotrichum truncatum. Line 458-57 (partially resistant) and cv. Eston (susceptible) were planted in fields with a history of low, partial, and high anthracnose pressures. Unsprayed plots were compared with plots receiving a single application of either I or 2 kg a. i./ha of chlorothalonil at the 10- to 12-node stage, and two applications of 1 kg a.i./ha at the 10- to 12-node stage and to days later. Anthracnose severity in unsprayed plots was highest (78% for cv. Eston and 62% for 458-57) at high disease pressure, intermediate (62% for cv. Eston and 46% for 458-57) at partial disease pressure, and lowest (26% for cv. Eston and 15% for 458-57) at low disease pressure. Yield losses in unsprayed plots ranged from 26 to 57% in cv. Eston and 20 to 28% in 458-57, with the most significant losses occurring in cv. Eston at high disease pressure. Applications of...","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77582933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-03-01DOI: 10.1080/07060661.1999.10600129
A. Starratt, G. Lazarovits
Abstract Melon seedlings grown in the presence of low levels of the dinitroaniline herbicide trifluralin and the chloroacetamide herbicide acetochlor to induce resistance to Fusarium oxysporum f. sp. melonis (the cause of fusarium wilt) had elevated levels of free amino acids. This response with trifluralin is similar to that previously described for tomato seedlings treated with various dinitroanilines. In tomato, however, acetochlor did not induce resistance to F. oxysporum f. sp. lycopersici or result in elevated levels of amino acids.
{"title":"Herbicide-induced disease resistance and associated increases in free amino acid levels in melon plants","authors":"A. Starratt, G. Lazarovits","doi":"10.1080/07060661.1999.10600129","DOIUrl":"https://doi.org/10.1080/07060661.1999.10600129","url":null,"abstract":"Abstract Melon seedlings grown in the presence of low levels of the dinitroaniline herbicide trifluralin and the chloroacetamide herbicide acetochlor to induce resistance to Fusarium oxysporum f. sp. melonis (the cause of fusarium wilt) had elevated levels of free amino acids. This response with trifluralin is similar to that previously described for tomato seedlings treated with various dinitroanilines. In tomato, however, acetochlor did not induce resistance to F. oxysporum f. sp. lycopersici or result in elevated levels of amino acids.","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76753013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-03-01DOI: 10.1080/07060661.1999.10600131
W. Ko, R. Kunimoto
Abstract Quick decline is the most serious disease of macadamia trees in Hawaii. Some macadamia trees showing symptoms of quick decline in commercial orchards on the island of Hawaii did not display macroscopic fungal fruiting bodies on the trunks. Acremonium recifei was consistently isolated from bark and wood obtained from trunks of these trees. The fungus was demonstrated to kill twigs of healthy macadamia trees when these twigs were artificially inoculated. Results suggest that trunk infection by A. recifei may lead to girdling, resulting in a rapid decline of macadamia trees.
{"title":"ACREMONIUM RECIFEI : A NEW CAUSAL AGENT OF MACADAMIA QUICK DECLINE","authors":"W. Ko, R. Kunimoto","doi":"10.1080/07060661.1999.10600131","DOIUrl":"https://doi.org/10.1080/07060661.1999.10600131","url":null,"abstract":"Abstract Quick decline is the most serious disease of macadamia trees in Hawaii. Some macadamia trees showing symptoms of quick decline in commercial orchards on the island of Hawaii did not display macroscopic fungal fruiting bodies on the trunks. Acremonium recifei was consistently isolated from bark and wood obtained from trunks of these trees. The fungus was demonstrated to kill twigs of healthy macadamia trees when these twigs were artificially inoculated. Results suggest that trunk infection by A. recifei may lead to girdling, resulting in a rapid decline of macadamia trees.","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77753966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-03-01DOI: 10.1080/07060661.1999.10600117
Hai Yu, J. Sutton
Abstract Density patterns of colony-forming units (CFU) of the biocontrol agent Gliocladium roseum were investigated in raspberry cv. Boyne and cv. Redwing after spore suspensions (107 conidia/mL) were applied 2 h before dusk in field plots. Estimated density of G. roseum on leaves of both cultivars was 2 x 103 to 5 x 103 CFU/cm2 at 1 h after inoculation. During the next 2 days density of the agent progressively decreased, but at 3–10 days after inoculation it fluctuated around 10–102 CFU/cm2 leaf in ‘Boyne’ and after or 3–12 days, it fluctuated near 103 CFU/cm2 leaf in ‘Redwing’. Density of G. roseum on flowers was 1 x 104 to 5 x 104 CFU/flower at 1 h after inoculation and declined rapidly in ‘Boyne’ and slowly in ‘Redwing’. At 3–10 and 3–12 days, respectively, the density fluctuated around 70 CFU/flower in ‘Boyne’ and 800–2300 CFU/flower in ‘Redwing’. Germination of G. roseum, observed on stamens of ‘Boyne’, was sparse (<4–10%) in the field. However, germination potential, estimated in stamens of flower...
{"title":"Density dynamics of Gliocladium roseum in relation to biological control of Botrytis cinerea in red raspberry","authors":"Hai Yu, J. Sutton","doi":"10.1080/07060661.1999.10600117","DOIUrl":"https://doi.org/10.1080/07060661.1999.10600117","url":null,"abstract":"Abstract Density patterns of colony-forming units (CFU) of the biocontrol agent Gliocladium roseum were investigated in raspberry cv. Boyne and cv. Redwing after spore suspensions (107 conidia/mL) were applied 2 h before dusk in field plots. Estimated density of G. roseum on leaves of both cultivars was 2 x 103 to 5 x 103 CFU/cm2 at 1 h after inoculation. During the next 2 days density of the agent progressively decreased, but at 3–10 days after inoculation it fluctuated around 10–102 CFU/cm2 leaf in ‘Boyne’ and after or 3–12 days, it fluctuated near 103 CFU/cm2 leaf in ‘Redwing’. Density of G. roseum on flowers was 1 x 104 to 5 x 104 CFU/flower at 1 h after inoculation and declined rapidly in ‘Boyne’ and slowly in ‘Redwing’. At 3–10 and 3–12 days, respectively, the density fluctuated around 70 CFU/flower in ‘Boyne’ and 800–2300 CFU/flower in ‘Redwing’. Germination of G. roseum, observed on stamens of ‘Boyne’, was sparse (<4–10%) in the field. However, germination potential, estimated in stamens of flower...","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79178065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-03-01DOI: 10.1080/07060661.1999.10600090
T. Zhou, G. Boland
Abstract Hypovirulent dsRNA-containing, and virulent dsRNA-free, isolates of Sclerotinia sclerotiorum were compared for mycelial growth and oxalic acid production in liquid culture. When harvested at 14 days post-inoculation, hypovirulenr isolates 91 and 215 produced less dry mycelium than virulent isolates 191 and 275C in potato-dextrose broth (PDB) and PDB amended with sodium succinate (PDBSS). All isolates produced more oxalic acid per gram dry mycelium When grown in PDBSS than in PDB. In a time course study, hypovirulent isolates 91 and 275 produced less mycelium (0.23 and 0.03 g dry wt.) and oxalic acid (0.22 and 0.01 mg/mL) than virulent isolates 191 and 275C (0.81 and 0.91 g dry wt., and 0.50 and 0.63 mg oxalic acid per millilitre, respectively) at 15 days post-inoculation. The amount of oxalic acid produced per gram dry mycelium reached a maximum for virulent isolates 191 and 275C at 3 and 5 days post-inoculation. Hypovirulent isolate 91 reached a maximum at 9 days post-inoculation, and hypovirule...
{"title":"Mycelial growth and production of oxalic acid by virulent and hypovirulent isolates of Sclerotinia sclerotiorum","authors":"T. Zhou, G. Boland","doi":"10.1080/07060661.1999.10600090","DOIUrl":"https://doi.org/10.1080/07060661.1999.10600090","url":null,"abstract":"Abstract Hypovirulent dsRNA-containing, and virulent dsRNA-free, isolates of Sclerotinia sclerotiorum were compared for mycelial growth and oxalic acid production in liquid culture. When harvested at 14 days post-inoculation, hypovirulenr isolates 91 and 215 produced less dry mycelium than virulent isolates 191 and 275C in potato-dextrose broth (PDB) and PDB amended with sodium succinate (PDBSS). All isolates produced more oxalic acid per gram dry mycelium When grown in PDBSS than in PDB. In a time course study, hypovirulent isolates 91 and 275 produced less mycelium (0.23 and 0.03 g dry wt.) and oxalic acid (0.22 and 0.01 mg/mL) than virulent isolates 191 and 275C (0.81 and 0.91 g dry wt., and 0.50 and 0.63 mg oxalic acid per millilitre, respectively) at 15 days post-inoculation. The amount of oxalic acid produced per gram dry mycelium reached a maximum for virulent isolates 191 and 275C at 3 and 5 days post-inoculation. Hypovirulent isolate 91 reached a maximum at 9 days post-inoculation, and hypovirule...","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84684550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-03-01DOI: 10.1080/07060661.1999.10600115
R. Winder
Abstract Marsh reed grass (Calamagrostis canadensis [Michx.] Beauv.), a plant that limits conifer growth in boreal forest regeneration, was sampled in western Canada for the presence of potential fungal biocontrol agents. Of 20 isolates screened for pathogenicity, Colletotrichum sp., Fusarium spp., and Dilophospora alopecuri (Fr.:Fr.) Fr. were pathogenic to marsh reed grass. Colletotrichum isolate PFC13 caused up to 54% damage when formulated in powdered alginate and applied with a vegetable oil and surfactant combination. The virulence of Fusarium isolates varied with isolate and incubation conditions, while the virulence of isolate PFCI3 was sensitive to formulation conditions. Fusarium isolates had a broad host range, causing up to 78% leaf area damage on marsh reed grass seedlings. Isolate PFC13 had a narrower host range than the Fusarium isolates, including oat, sunflower, and rye, but not other plants such as corn or wheat. Fungi have potential as biocontrol agents of marsh reed grass when considere...
{"title":"Evaluation of Colletotrichum sp. and Fusarium spp. as potential biological control agents for marsh reed grass (Calamagrostis canadensis)","authors":"R. Winder","doi":"10.1080/07060661.1999.10600115","DOIUrl":"https://doi.org/10.1080/07060661.1999.10600115","url":null,"abstract":"Abstract Marsh reed grass (Calamagrostis canadensis [Michx.] Beauv.), a plant that limits conifer growth in boreal forest regeneration, was sampled in western Canada for the presence of potential fungal biocontrol agents. Of 20 isolates screened for pathogenicity, Colletotrichum sp., Fusarium spp., and Dilophospora alopecuri (Fr.:Fr.) Fr. were pathogenic to marsh reed grass. Colletotrichum isolate PFC13 caused up to 54% damage when formulated in powdered alginate and applied with a vegetable oil and surfactant combination. The virulence of Fusarium isolates varied with isolate and incubation conditions, while the virulence of isolate PFCI3 was sensitive to formulation conditions. Fusarium isolates had a broad host range, causing up to 78% leaf area damage on marsh reed grass seedlings. Isolate PFC13 had a narrower host range than the Fusarium isolates, including oat, sunflower, and rye, but not other plants such as corn or wheat. Fungi have potential as biocontrol agents of marsh reed grass when considere...","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78405552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-03-01DOI: 10.1080/07060661.1999.10599970
K. Rashid, E. Kenaschuk
Abstract The genetics of resistance to flax rust (caused by Melampsora lini) in six flax (Linum usitatissimum) introductions from Argentina were investigated in a series of crosses with single-gene lines for rust resistance. These introductions proved resistant to the most virulent rust races in the North American collection of M. lini. Segregating patterns in F2 and BCF1 populations from crosses with the effective rust resistance genes indicated the presence of three resistance genes designated as Al, A2, and A3. These genes are different from the rust resistance genes present in the 30 single-gene lines used to differentiate the North American races of M. lini
{"title":"Three new rust resistance genes in flax introductions","authors":"K. Rashid, E. Kenaschuk","doi":"10.1080/07060661.1999.10599970","DOIUrl":"https://doi.org/10.1080/07060661.1999.10599970","url":null,"abstract":"Abstract The genetics of resistance to flax rust (caused by Melampsora lini) in six flax (Linum usitatissimum) introductions from Argentina were investigated in a series of crosses with single-gene lines for rust resistance. These introductions proved resistant to the most virulent rust races in the North American collection of M. lini. Segregating patterns in F2 and BCF1 populations from crosses with the effective rust resistance genes indicated the presence of three resistance genes designated as Al, A2, and A3. These genes are different from the rust resistance genes present in the 30 single-gene lines used to differentiate the North American races of M. lini","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82959962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-03-01DOI: 10.1080/07060661.1999.10599997
C. Snyder, A. Jones
Abstract Polymerase chain reaction (PCR)-mediated analysis of rDNA from isolates of Monilinia fructicola and Monilinia laxa from Michigan cheny orchards revealed interspecies restriction site variation in the internal transcribed spacer 1 (ITSI) region and length variation in the small subunit (SSU) rRNA gene. 1TS1 sequences from both species were 146 by long; however, the ITSI of M. laxa differed at three positions from the ITSI of M. fructicola. Although the sequences of the ITS1 regions from both species were nearly identical, the enzyme tilrel cuts the PCR-amplified ITSI region of the two species differentially. PCR amplification of the 3′ end of the SSU rRNA gene yielded products of approximately 940 and 520 by from M. fructicola and M. laxa, respectively. A 421-bp group I intron was detected by PCR within the SSU rDNA of 32 isolates of M. fructicola but not in the eight isolates of M. laxa. Intron sequences from each of four isolates of M. fructicola were identical, and the SSU rDNA flanking sequenc...
{"title":"Genetic variation between strains of Monilinia fructicola and Monilinia laxa isolated from cherries in Michigan","authors":"C. Snyder, A. Jones","doi":"10.1080/07060661.1999.10599997","DOIUrl":"https://doi.org/10.1080/07060661.1999.10599997","url":null,"abstract":"Abstract Polymerase chain reaction (PCR)-mediated analysis of rDNA from isolates of Monilinia fructicola and Monilinia laxa from Michigan cheny orchards revealed interspecies restriction site variation in the internal transcribed spacer 1 (ITSI) region and length variation in the small subunit (SSU) rRNA gene. 1TS1 sequences from both species were 146 by long; however, the ITSI of M. laxa differed at three positions from the ITSI of M. fructicola. Although the sequences of the ITS1 regions from both species were nearly identical, the enzyme tilrel cuts the PCR-amplified ITSI region of the two species differentially. PCR amplification of the 3′ end of the SSU rRNA gene yielded products of approximately 940 and 520 by from M. fructicola and M. laxa, respectively. A 421-bp group I intron was detected by PCR within the SSU rDNA of 32 isolates of M. fructicola but not in the eight isolates of M. laxa. Intron sequences from each of four isolates of M. fructicola were identical, and the SSU rDNA flanking sequenc...","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82962337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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