Pub Date : 1970-08-31DOI: 10.1270/JSBBS1951.20.187
K. Osone, K. Mikaelsen
Rice seeds were soaked in water at various lengths of time. Embryo development and metabolic activity (RNA- and DNA-synthesis) were studied in relation to changes in sensitivity to gamma radiation and the chemical mutagens, ethylmethanesulfonate (EMS) and methylmethanesulfonate (MMS). During the initial stage when swelling and elongation of the embryo took place, the sensitivity to EMS and MMS was decreasing. In the second stage with higher metabolic activity the sensitivity to gamma radiation and the mutagen increased slowly. In the third stage the sensitivity increased proportionally with the rapid increase of DNA-synthesis in the embryos.
{"title":"STUDIES ON EMBRYO DEVELOPMENT AND CHANGES IN SENSITIVITY TO GAMMA RADIATION AND ALKYLATING AGENTS (MMS AND EMS) IN RICE SEEDS DURING SOAKING IN WATER","authors":"K. Osone, K. Mikaelsen","doi":"10.1270/JSBBS1951.20.187","DOIUrl":"https://doi.org/10.1270/JSBBS1951.20.187","url":null,"abstract":"Rice seeds were soaked in water at various lengths of time. Embryo development and metabolic activity (RNA- and DNA-synthesis) were studied in relation to changes in sensitivity to gamma radiation and the chemical mutagens, ethylmethanesulfonate (EMS) and methylmethanesulfonate (MMS). During the initial stage when swelling and elongation of the embryo took place, the sensitivity to EMS and MMS was decreasing. In the second stage with higher metabolic activity the sensitivity to gamma radiation and the mutagen increased slowly. In the third stage the sensitivity increased proportionally with the rapid increase of DNA-synthesis in the embryos.","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1970-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126585955","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 frequency of M2 aberrants falling outside the variation range of original variety defined with a certain confidence limit (α) was studied on its availability for estimation of mutational effects. Experimental results suggested that the frequency of aberrants was a highly effective index in some quantitative characters not only for estimation of mutational effects but also far selection of mutants.
{"title":"STUDIES ON THE UTILITY OF ARTIFICIAL MUTATIONS IN PLANT BREEDING. : VI. Estimation of Mutational Effects by the Frequency of Aberrants in M2 Generation.","authors":"T. Ko, H. Yamagata, K. Syakudo","doi":"10.1270/JSBBS1951.19.89","DOIUrl":"https://doi.org/10.1270/JSBBS1951.19.89","url":null,"abstract":"The frequency of M2 aberrants falling outside the variation range of original variety defined with a certain confidence limit (α) was studied on its availability for estimation of mutational effects. Experimental results suggested that the frequency of aberrants was a highly effective index in some quantitative characters not only for estimation of mutational effects but also far selection of mutants.","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"197 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1969-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124398545","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 : 1968-06-30DOI: 10.1270/JSBBS1951.18.123
T. Akihama
{"title":"SEASONAL CHANGE OF COMPETITIVE ABILITY IN VEGETATIVE CHARACTERS IN MIXED POPULATION OF RICE VARIETIES.","authors":"T. Akihama","doi":"10.1270/JSBBS1951.18.123","DOIUrl":"https://doi.org/10.1270/JSBBS1951.18.123","url":null,"abstract":"","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1968-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126203024","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}
： Resistance of soybean varieties to the sQybean tested ． Resis 【 ance varieties to the race were classified ｝ nto two types ， and
大豆品种对大豆的抗性试验。对该人种的遗传变异分为两类
{"title":"STUDIES ON THE RESISTANCE OF SOYBEAN VARIETIES TO THE SOYBEAN CYST NEMATODE. : I. Comparison of Varietal Responses.","authors":"S. Sugiyama, K. Hiroma","doi":"10.1270/JSBBS1951.18.80","DOIUrl":"https://doi.org/10.1270/JSBBS1951.18.80","url":null,"abstract":"： Resistance of soybean varieties to the sQybean tested ． Resis 【 ance varieties to the race were classified ｝ nto two types ， and","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"174 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1968-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114607271","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}
performed. These varieties were found to carry two dominant genes for resistance, Pi-a and Pi-z. The latter gene is on a locus independent of or distant from the genes, Pi-a, Pi-k and Pi-ta, and is linked with the gene, Pi-i.
{"title":"THE INHERITANCE OF RESISTANCE OF THE ZENITH TYPE VARIETIES OF RICE TO THE BLAST FUNGUS","authors":"S. Kiyosawa","doi":"10.1270/JSBBS1951.17.99","DOIUrl":"https://doi.org/10.1270/JSBBS1951.17.99","url":null,"abstract":"performed. These varieties were found to carry two dominant genes for resistance, Pi-a and Pi-z. The latter gene is on a locus independent of or distant from the genes, Pi-a, Pi-k and Pi-ta, and is linked with the gene, Pi-i.","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"316 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115444582","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}
When dormant seeds of rice varieties were exposed to various doses of γ-rays, marked varietal differences in radiation effect on root growth were observed. It was shown that dose-response curves could be approximated by one general function irrespective of sensitivity.
{"title":"STUDIES ON VARIETAL DIFFERENCES IN RADIOSENSITIVITY IN RICE : I. Dose-response Curve for Root Growth and Varietal Difference in Radiosensitivity","authors":"Y. Ukai","doi":"10.1270/JSBBS1951.17.33","DOIUrl":"https://doi.org/10.1270/JSBBS1951.17.33","url":null,"abstract":"When dormant seeds of rice varieties were exposed to various doses of γ-rays, marked varietal differences in radiation effect on root growth were observed. It was shown that dose-response curves could be approximated by one general function irrespective of sensitivity.","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128024701","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 : 1966-12-25DOI: 10.1270/JSBBS1951.16.272
S. Nakao, Tadahiro Watanabe
Edgeworthia Gardineri from Nepal Himalaya is studied in relation to its use as a possible source of paper materials. The study was done in comparison with the Japanese corresponding species, E. papyrifera. The Himalayan species has the chromosome number of 108 at root-tip cells so it is 12X, because the basic chromosome number of Edgeworthia is X=9. The general morphological characteristics of the Himalayan species are almost similar to the Japanese species which is usually tetraploid, but the former has larger and thicker leaves and is evergreen while the Japanese species is deciduous. When the Himalayan species is compared with the artificially induced Japanese octoploid plants, it has. larger stomata cells, more chloroplasts in them and longer hairs on the leaves, but shorter fibre cells in the bark which are most important for paper materials.
{"title":"Chromosome number thia Gardneri MEISSN.","authors":"S. Nakao, Tadahiro Watanabe","doi":"10.1270/JSBBS1951.16.272","DOIUrl":"https://doi.org/10.1270/JSBBS1951.16.272","url":null,"abstract":"Edgeworthia Gardineri from Nepal Himalaya is studied in relation to its use as a possible source of paper materials. The study was done in comparison with the Japanese corresponding species, E. papyrifera. The Himalayan species has the chromosome number of 108 at root-tip cells so it is 12X, because the basic chromosome number of Edgeworthia is X=9. The general morphological characteristics of the Himalayan species are almost similar to the Japanese species which is usually tetraploid, but the former has larger and thicker leaves and is evergreen while the Japanese species is deciduous. When the Himalayan species is compared with the artificially induced Japanese octoploid plants, it has. larger stomata cells, more chloroplasts in them and longer hairs on the leaves, but shorter fibre cells in the bark which are most important for paper materials.","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1966-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124921500","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 : 1966-09-25DOI: 10.1270/JSBBS1951.16.179
K. Kushibuchi, S. Hashiguchi, R. Ito
{"title":"Studies on the biometrical selective method. I. Quantitative expression of the breeding purpose.","authors":"K. Kushibuchi, S. Hashiguchi, R. Ito","doi":"10.1270/JSBBS1951.16.179","DOIUrl":"https://doi.org/10.1270/JSBBS1951.16.179","url":null,"abstract":"","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1966-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125830400","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 : 1966-06-25DOI: 10.1270/JSBBS1951.16.138
Kanziro Saio
When there is dependency among environmental effects, if the variance of an individual unit is E, the variance of n individuals is not to be E/n. H. F. SMITH has suggested ernpirically that it should be E/nb (0<__-b__-<1). In this paper, the author clears up the relation between a parameter of b and the concept of a correlation directly showing dependency and indicates the appropriateness, or the limit of the appropriateness, of SMITH'S assumption. Besides, it also proves that the above-mentioned fact for the variance is fit for the covariance when two or more characteristics are observed.
当环境效应之间存在依赖关系时，如果单个单位的方差为E，则n个个体的方差不为E/n。H. F. SMITH曾实证地提出它应该是E/nb (0<__-b__-<1)。本文澄清了b的一个参数与直接表示相依性的相关概念之间的关系，指出了SMITH假设的适当性或适当性的极限。此外，还证明了当观察到两个或两个以上的特征时，方差的上述事实与协方差是拟合的。
{"title":"Some consideration when environmental effects of observations of bio-individual characteristics are dependent upon each other : particularly concerned with variance and covariance","authors":"Kanziro Saio","doi":"10.1270/JSBBS1951.16.138","DOIUrl":"https://doi.org/10.1270/JSBBS1951.16.138","url":null,"abstract":"When there is dependency among environmental effects, if the variance of an individual unit is E, the variance of n individuals is not to be E/n. H. F. SMITH has suggested ernpirically that it should be E/nb (0<__-b__-<1). In this paper, the author clears up the relation between a parameter of b and the concept of a correlation directly showing dependency and indicates the appropriateness, or the limit of the appropriateness, of SMITH'S assumption. Besides, it also proves that the above-mentioned fact for the variance is fit for the covariance when two or more characteristics are observed.","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1966-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123983560","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}
Smooth bromegrass seedlings derived from individual plants were evaluated for stand :and vigor in three trials in the greenhouse and one trial in the field. The results were as follows : 1. Progenies from single plants differed significantly in seedling vigor and stand, with some superior to commercial varieties. 2. Progenies superior in one trial tended to be better in others, although exceptions occurred. 3. Top weight of seedlings was sampled in one experiment, and this measure of 'seedling vigor was correlated highly with early vigor and final plant height. 4. Seed weight was correlated positively and significantly with seedling vigor but was not associated with stand. 5. Some differences in seedling characteristics occurred when 1958 and 1959 seed lots from the same plant were compared. Seedlings originating from the seed grown in 1959 were generally superior in vigor. 6. Variation ascribed to replication was highly significant in the fleld experiment but was important in only one of three greenhouse experiments.
{"title":"Seedling Characteristics of Single Plant Progenies of Smooth Bromegrass : Bromus inermis LEYSS","authors":"Y. Maki","doi":"10.1270/JSBBS1951.15.73","DOIUrl":"https://doi.org/10.1270/JSBBS1951.15.73","url":null,"abstract":"Smooth bromegrass seedlings derived from individual plants were evaluated for stand :and vigor in three trials in the greenhouse and one trial in the field. The results were as follows : 1. Progenies from single plants differed significantly in seedling vigor and stand, with some superior to commercial varieties. 2. Progenies superior in one trial tended to be better in others, although exceptions occurred. 3. Top weight of seedlings was sampled in one experiment, and this measure of 'seedling vigor was correlated highly with early vigor and final plant height. 4. Seed weight was correlated positively and significantly with seedling vigor but was not associated with stand. 5. Some differences in seedling characteristics occurred when 1958 and 1959 seed lots from the same plant were compared. Seedlings originating from the seed grown in 1959 were generally superior in vigor. 6. Variation ascribed to replication was highly significant in the fleld experiment but was important in only one of three greenhouse experiments.","PeriodicalId":270267,"journal":{"name":"Japanese journal of breeding","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1965-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122526181","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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