Pub Date : 1976-06-01DOI: 10.1270/JSBBS1951.26.137
S. Kiyosawa
Disease dispersion from a point source in pure and mixed stands of susceptible and resistant plants was followed by a simulation made by using the equation in respect with disease dispersion, y=are-5P. The effect of mixing of resistant plants in susceptible plants to inhibit the disease increase is reduced with the increase of disease dispersal gradient, 6, Iarger than 0.5. Infection rates calculated by the number of new lesions decrease straightly with the decrease of the proportion of susceptible plants against the logarithm of the proportion. This decrease is inhibited by the increase of disease dispersal gradient, 6. The effect of mixing of resistant plants is decreased with the decrease of spacing density. The infection rates calculated by the total number of new and old lesions give a dropping curve which is asymptotic to 0.
{"title":"A comparison by simulation of disease dispersal in pure and mixed stands of susceptible and resistant plants.","authors":"S. Kiyosawa","doi":"10.1270/JSBBS1951.26.137","DOIUrl":"https://doi.org/10.1270/JSBBS1951.26.137","url":null,"abstract":"Disease dispersion from a point source in pure and mixed stands of susceptible and resistant plants was followed by a simulation made by using the equation in respect with disease dispersion, y=are-5P. The effect of mixing of resistant plants in susceptible plants to inhibit the disease increase is reduced with the increase of disease dispersal gradient, 6, Iarger than 0.5. Infection rates calculated by the number of new lesions decrease straightly with the decrease of the proportion of susceptible plants against the logarithm of the proportion. This decrease is inhibited by the increase of disease dispersal gradient, 6. The effect of mixing of resistant plants is decreased with the decrease of spacing density. The infection rates calculated by the total number of new and old lesions give a dropping curve which is asymptotic to 0.","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123580530","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 : 1975-12-31DOI: 10.1270/JSBBS1951.25.349
I. A.S, M. Haque
In 1969 an almost sterile hybrid (2n=14) between a short-day variety of 'Tossa' jute (=Corchorus olitorius; 2n=14) and a photo-neutral wild species, C, depressus (2n=14) was obtained. In F3, approximately 80% of the plants were short-day and 20% photo-neutral suggesting that the latter character is probably recessive. A few F3's chosen at random for chromosome counts turned out to be tetraploids (2n=28) indicating that the F2 parents of the F3 population underwent chro-mosome doubling. While characters of the economic importance such as height and nonbranching habit were almost restored in the F4 and the F5, fibre qualities deteriorated in thern. Fibre qualities however improved in sorne backcross progeny. Further the recessive (?) character for photo-neutrality continued to segregate in F4 and in F5' The presence of a paracentric inversion throwing out the gene in the form of a fragment during chromatid bridge formation is suggested to be the cause for the non-fixation of the photo-neutral character in the progeny.
{"title":"An Attempt to Produce a Photo-neutral Strain of Jute through Interspecific Hybridization","authors":"I. A.S, M. Haque","doi":"10.1270/JSBBS1951.25.349","DOIUrl":"https://doi.org/10.1270/JSBBS1951.25.349","url":null,"abstract":"In 1969 an almost sterile hybrid (2n=14) between a short-day variety of 'Tossa' jute (=Corchorus olitorius; 2n=14) and a photo-neutral wild species, C, depressus (2n=14) was obtained. In F3, approximately 80% of the plants were short-day and 20% photo-neutral suggesting that the latter character is probably recessive. A few F3's chosen at random for chromosome counts turned out to be tetraploids (2n=28) indicating that the F2 parents of the F3 population underwent chro-mosome doubling. While characters of the economic importance such as height and nonbranching habit were almost restored in the F4 and the F5, fibre qualities deteriorated in thern. Fibre qualities however improved in sorne backcross progeny. Further the recessive (?) character for photo-neutrality continued to segregate in F4 and in F5' The presence of a paracentric inversion throwing out the gene in the form of a fragment during chromatid bridge formation is suggested to be the cause for the non-fixation of the photo-neutral character in the progeny.","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1975-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117173716","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 : 1975-12-31DOI: 10.1270/JSBBS1951.25.355
Kiyoshi Saito
Rhodohypoxis baueri is one of the newly introduced African bulbous fl. owers and is attractive with a plenty of star-like flowers. Hitherto, several cultivars with small fiowers have) been known as diploid (2n=12), and furthermore, extra-large flowering cultivars such as "Tetra Whlte" were presumed to be tetraploid. However, the author has confirmed firstly that the latters are triploid (2n=18), and has explained their morphological and cytological characteristics, compatin with those of the former diploids. Lastly, grades of self- and cross-incompatibilities in several cultivars were examined by seed-bearing abilities through self-pollination and inter-varietal crossin".
{"title":"Studies on the Occurrence of Polyploidy and its Contributions to the Flower Plant Breeding. XII. On the Nature and Sterility in the Spontaneous Triploid Cultivars of Rhodohypoxis baueri NEL.","authors":"Kiyoshi Saito","doi":"10.1270/JSBBS1951.25.355","DOIUrl":"https://doi.org/10.1270/JSBBS1951.25.355","url":null,"abstract":"Rhodohypoxis baueri is one of the newly introduced African bulbous fl. owers and is attractive with a plenty of star-like flowers. Hitherto, several cultivars with small fiowers have) been known as diploid (2n=12), and furthermore, extra-large flowering cultivars such as \"Tetra Whlte\" were presumed to be tetraploid. However, the author has confirmed firstly that the latters are triploid (2n=18), and has explained their morphological and cytological characteristics, compatin with those of the former diploids. Lastly, grades of self- and cross-incompatibilities in several cultivars were examined by seed-bearing abilities through self-pollination and inter-varietal crossin\".","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1975-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129356722","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 : 1975-06-30DOI: 10.1270/JSBBS1951.25.161
T. Wakizuka, T. Nakajima
The in vitro development from zygote to proembryo in ovules of Petunia hybrida Vilrn. was investigated. Zygote could grow to early globular ernbryo on a simple nutrient medium provided osmotic value of medium had been favourable. Attention is drawn to the initiation of abnormal structure in embryo sac.
{"title":"Development of Proembryo in Cultured Ovules of Petunia hybrida Vilm.","authors":"T. Wakizuka, T. Nakajima","doi":"10.1270/JSBBS1951.25.161","DOIUrl":"https://doi.org/10.1270/JSBBS1951.25.161","url":null,"abstract":"The in vitro development from zygote to proembryo in ovules of Petunia hybrida Vilrn. was investigated. Zygote could grow to early globular ernbryo on a simple nutrient medium provided osmotic value of medium had been favourable. Attention is drawn to the initiation of abnormal structure in embryo sac.","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1975-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133634438","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 : 1974-08-31DOI: 10.1270/JSBBS1951.24.165
T. Katayama, T. Ogawa
True F1 hybrid between diploid O. punctata and Ceylonese officinaJis (CC) was first produ-ced by the authors. The F1 hybrids within diploid O. punctata showed complete pairing in chromosomes at MI, while those between diploid O. punctata and the others (intermediate form, O. eichin-geri and Ceylonese officinalis) showed low pair-ing in mean at MI, various irregularities and complete sterility of seed. Based on the present results and other evi-dences, the authors again Propose that the genome of diploid O.punctata should be des-ignated as BB.
{"title":"Cytogenetical Studies on the Genus Oryza : VII. Cytogenetical Studies on F1 Hybrids between Diploid O. punctata and Diploid Species having C genome","authors":"T. Katayama, T. Ogawa","doi":"10.1270/JSBBS1951.24.165","DOIUrl":"https://doi.org/10.1270/JSBBS1951.24.165","url":null,"abstract":"True F1 hybrid between diploid O. punctata and Ceylonese officinaJis (CC) was first produ-ced by the authors. The F1 hybrids within diploid O. punctata showed complete pairing in chromosomes at MI, while those between diploid O. punctata and the others (intermediate form, O. eichin-geri and Ceylonese officinalis) showed low pair-ing in mean at MI, various irregularities and complete sterility of seed. Based on the present results and other evi-dences, the authors again Propose that the genome of diploid O.punctata should be des-ignated as BB.","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1974-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133377976","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}
The time of onset of nucleic acid syntheses and mitosis have been determined especially in the first leaf meristem of germinating barley seed. These cells in the dormant barley seed remain at G1 and the synchronization of cell division is attained by proceeding them simultaneously to S phase with the seed soaking.
{"title":"Timing of Nucleic Acid Syntheses and Mitosis in the First Leaf Meristem of Germinating Barley Seeds","authors":"A. Tatara, H. Yamaguchi","doi":"10.1270/JSBBS1951.23.15","DOIUrl":"https://doi.org/10.1270/JSBBS1951.23.15","url":null,"abstract":"The time of onset of nucleic acid syntheses and mitosis have been determined especially in the first leaf meristem of germinating barley seed. These cells in the dormant barley seed remain at G1 and the synchronization of cell division is attained by proceeding them simultaneously to S phase with the seed soaking.","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"198 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1973-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121151469","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 : 1972-04-30DOI: 10.1270/JSBBS1951.22.114
M. Mii, R. Iwasa
Karyological studies were made on three species of Portulaca : P. grandiflora, P. “Jewel” and P. pilosa. From the obserbation, the evolution of karyotype, the relation between basic numbers and life forms, and the possibility of interspecific hybridization between P. grandiflora and P. “Jewel” were discussed.
{"title":"Karyological Studies on Three Species of Portulaca","authors":"M. Mii, R. Iwasa","doi":"10.1270/JSBBS1951.22.114","DOIUrl":"https://doi.org/10.1270/JSBBS1951.22.114","url":null,"abstract":"Karyological studies were made on three species of Portulaca : P. grandiflora, P. “Jewel” and P. pilosa. From the obserbation, the evolution of karyotype, the relation between basic numbers and life forms, and the possibility of interspecific hybridization between P. grandiflora and P. “Jewel” were discussed.","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1972-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131037893","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 : 1971-08-31DOI: 10.1270/JSBBS1951.21.219
K. Arashi, M. Tejima, F. Fujimoto
{"title":"Studies on the Local Adaptation of Sugar Beet Varieties : Especially New Varieties Bred by Branch of Japan Sugar Beet Institute.","authors":"K. Arashi, M. Tejima, F. Fujimoto","doi":"10.1270/JSBBS1951.21.219","DOIUrl":"https://doi.org/10.1270/JSBBS1951.21.219","url":null,"abstract":"","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1971-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133765459","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 : 1971-06-30DOI: 10.1270/JSBBS1951.21.160
K. Yonezawa, M. Ichii, H. Yamagata
Complements to the previously offered theory were presented and some numerical computations of the components, of which the theoretical equation for the estimation of X2-population size consists, were carried out for meeting our various necessities.
本文对前人提出的理论进行了补充，并对其组成部分进行了数值计算，得到了x2种群规模估计的理论方程。
{"title":"Theoretical Basis for Determining the Number of X2-Plants Required for Improvement of Quantitative Characters of Self-Pollinating Crops : II. Complement to the Theory and Numerical Computations","authors":"K. Yonezawa, M. Ichii, H. Yamagata","doi":"10.1270/JSBBS1951.21.160","DOIUrl":"https://doi.org/10.1270/JSBBS1951.21.160","url":null,"abstract":"Complements to the previously offered theory were presented and some numerical computations of the components, of which the theoretical equation for the estimation of X2-population size consists, were carried out for meeting our various necessities.","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1971-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124731828","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 : 1970-12-31DOI: 10.1270/JSBBS1951.20.359
F. Fujimoto, T. Matsumura
Comparison of the actual sugnr yield of the synthetic varieties with predicted yield based on general combining ability indicated that the optimum number of component strains in the synthetic variety would be about six. But, actual sugar yield was the highest in the three-strain synthetic variety, which was in agreement with the predicted yield based on specific combining ability. The decrease in sugar yield in Syn2 and Syn3 generation was small. The superior synthetic variety can be obtained with smaller number of component strains, in which the specific combining ability might have greater importance.
{"title":"STUDIES ON THE BREEDING METHOD OF SYNTHETIC VARIETIES IN SUGAR BEET. : III. Performance of Synthetic Varieties and Number of Component Strains.","authors":"F. Fujimoto, T. Matsumura","doi":"10.1270/JSBBS1951.20.359","DOIUrl":"https://doi.org/10.1270/JSBBS1951.20.359","url":null,"abstract":"Comparison of the actual sugnr yield of the synthetic varieties with predicted yield based on general combining ability indicated that the optimum number of component strains in the synthetic variety would be about six. But, actual sugar yield was the highest in the three-strain synthetic variety, which was in agreement with the predicted yield based on specific combining ability. The decrease in sugar yield in Syn2 and Syn3 generation was small. The superior synthetic variety can be obtained with smaller number of component strains, in which the specific combining ability might have greater importance.","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1970-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130753386","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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