Japanese Journal of Breeding

Relationships of Actual Performance of Double Cross Hybrids and Predicted Value based on the Mean Value of the Single Crosses concerned in the Silkworm, Bombyx Mori L.

Isamu MlNAGAWA, Yasuo OTSUKA

1975 Volume 25 Issue 5 Pages 251-257
Published: October 31, 1975
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.25.251

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The correlation between actual performances of double cross hybnds and mean values of corresponding measurements obtained for single crosses produced among parenta, 1 four strains were examined in the silkworm, in order to evaluate the possibility of prediction of double cross performance frorn the single cross data. It was found that the correlations were high for some traits such as cocoon shell percentage, raw silk percentage, Iength of cocoon filarnent and size of cocoon filament, but they were low for others such as pupation rate, cocoon yield and reelability.

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Effect of Different Chromosome Numbers of Tobacco Pollen on Plant Formation by Anther Culture and Fertilization

Minoru NIIZEKI, Fumiji KITA

1975 Volume 25 Issue 5 Pages 258-264
Published: October 31, 1975
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.25.258

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The ability of pollens with various chromosome numbers in fertilization to diploid plants and androgenetic plant formation by anther culture were compared by using several kinds of polyploid and aneuploid plants. The totipotency of pollens differentiated into plants by the anther culture was not likely to be strikingly affected by the difference of chromosome numbers, while the pollens fertilized to the diploid plants had a conspicuous advantage in lower chromosome numbers than the others.

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The mechanisms of weediness found in. dallisgrass populations

Hiroko MORISHIMA

1975 Volume 25 Issue 5 Pages 265-274
Published: October 31, 1975
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.25.265

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Twenty natural populations of apomictic dallisgrass were examined to look into its adaptive mechanisrns. The weediness of this species depends on its "general-purpose" genotype expressing tolerance to environmental stresses, competitive ability, phenotypic plasticity and colo-nizing ability by seed dispersal.

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Studies on the Transfer of Desirable Genes by Backcrossing : II. Backcross-breeding Systems by the Use of Genetic Male Sterility in Self-pollinated Crops

Hiroshi FUJIMAKI

1975 Volume 25 Issue 5 Pages 275-282
Published: October 31, 1975
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.25.275

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New breeding systems are suggested for facilitating backcrosses of self-pollinated crops by manipulating genetic male sterility. Three models are presented with regard to the use of different kinds of male-sterility genes.

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[title in Japanese]

[in Japanese]

1975 Volume 25 Issue 5 Pages 283-285
Published: October 31, 1975
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.25.283

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