Japanese Journal of Breeding

Biological Effect of High LET Radiations after Post-Irradiation Storage or with Low and High LET Combination Treatments in Rice

H.K. Shama, Taro Fujii

1973 Volume 23 Issue 3 Pages 121-124
Published: June 30, 1973
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.23.121

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The present experiments ware conducted to find out the influence of post-irradiation storage as well as pre/post gamma-ray and neutron combination treatments on the biological effects in rice. In the storage experiment, it may be noted that enhanced radiation damage occurred upto 20 days storage with some recovery at 30 days. In the combination treatments with neutrons and gamma-rays, the extent of radiation damage differed by the combination procedures.

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Studies on the Chemical Quality of Rice Kernel : V. Selection of Mutants with High Protein Content Induced by Ethyleneimine Treatment.

Katsumi Kataoka

1973 Volume 23 Issue 3 Pages 125-130
Published: June 30, 1973
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.23.125

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Mutants with changes of seed protein content in rice were obtained by ethyleneimine (EI) treatment with three levels of concentration. In M₂ generation mutation frequency and nurnber of high protein mutants increased with the increasing EI concentration. Agronomic characteristics of some mutants with high protein content were also observed in M4 generation. The characters of most of them were improved or at least sirnilar to those of the original variety. These facts seem to suggest the possibility of breeding new varieties with high protein content of grain by utilization of EI induced mutants.

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Relationships between in Vitro Digestibility and Morphological Characters in Alfalfa (Medicago sativa L.) : II. Selection for I. V. D. on the Basis of Correlation between I. V. D. and Other Agronomic Characters

Kenichi Suginobu, B.R. Christie

1973 Volume 23 Issue 3 Pages 131-138
Published: June 30, 1973
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.23.131

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Correlation coefficients between in vitro digestibility (I. V.D.) and morphological characters were estimated. I.V.D. of both leaves and stems were negatively correlated with plant weight but the values were low. Phenotypic selection in a space planted nursery should be based on desirable characters, agronomically with a consideration of leafiness. Selection for I.V.D. should then be carried out on the above selections.

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Genetic Studies on the Negative Correlation between Root Weight and Sugar Content in Sugar Beets. : VIII. Correlated Response of Some Foliar Characters Accompanied with Mass Selection

Chikahiro Tsuda, Michio Hachinoe

1973 Volume 23 Issue 3 Pages 139-147
Published: June 30, 1973
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.23.139

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In sugar beets, generally, root weight and sucrose content are negatively correlated. Data from a number of progeny lines indicated that root weight was correlated to lamina weight, while sucrose content was correlated to leaf nurnber. It was suggested that selection for these leaf characters might be useful for improvement of root weight and sucrose content.

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[title in Japanese]

[in Japanese], [in Japanese]

1973 Volume 23 Issue 3 Pages 148-152
Published: June 30, 1973
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.23.148

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[title in Japanese]

[in Japanese], [in Japanese]

1973 Volume 23 Issue 3 Pages 152-154
Published: June 30, 1973
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.23.152

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