Japanese Journal of Breeding

Cytogenetical Studies on the Genus Oryza : VII. Cytogenetical Studies on F₁ Hybrids between Diploid O. punctata and Diploid Species having C genome

Taira KATAYAMA, Tsugufumi OGAWA

1974 Volume 24 Issue 4 Pages 165-168
Published: August 31, 1974
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.24.165

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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.

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Effects of r-Ray lrradiation on the Development of Leaf-and FIlower Buds in Tea Plants. : I. Changes in Number bf Leaf-and Flower Buds

Kazumi KUDO, Yuzo FUTSUHARA

1974 Volume 24 Issue 4 Pages 169-175
Published: August 31, 1974
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.24.169

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The tea plant is suitable material for studying -the radiation effects on the development of the leaf-and flower buds because each bud has three primo-rdia, inner one of which would develop to the leaf bud, the others to the flower buds, if possible. Whether these primordia would develop to the leaf bud or the flower buds depends upon the inte-lrnal and external conditions of the plants. Based on such a view, 2 to 7 year-old plants of tea varieties were irradiated chronically with gam-ma rays (⁶⁰Co) at the two stages of development. The levels of exposure were 1O, 12.5, 25, 50, 100 and 200R/day.

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Breeding for Saline-resistant Varieties of Rice : II. Comparative Performance of Some Rice Varieties to Salinity During Early Development Stages

AKBAR Muhammad, Tomosaburo YABUNO

1974 Volume 24 Issue 4 Pages 176-181
Published: August 31, 1974
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.24.176

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The response of four rice varieties : Blue-bonnet, IR 8, Jhona 349 and Magnola to salinization during germination and early, development stages was observed by using water-culture techniques. The three rice varie-ties : Bluebonnet, Jhona 349 and Magnolia were highly resistant to salinity during germina-tion. In general, all the four rice varieties were much more sensitive during the young-seedling and at the transplanting stages than during the germination stage. The variety Magnolia was the most tolerant during germination stage and the most sensi-tive during seedling stage in respect to dry matters. On the contrary, IR 8 was the least tolerant of the four varieties tested during germination and was relatively tolerant during seedling stagre in respect to dry matters. Magnolia showed relatively better performance than the other three varieties at transplanting. In general, each variety behaved quite differe-ntly to salinity during different development stages. Therefore, it is rather di fficult to compare one stage of plant development with anoter for the same variety.

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Effect of Cultural Condition on the in vitro Development of Ovules in Petunia hybrida Vilm.

Takumi WAKIZUKA, Tetsuo NAKAJIMA

1974 Volume 24 Issue 4 Pages 182-187
Published: August 31, 1974
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.24.182

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The successful development of the young ovules excised separately from placenta soon aLter fertilization has not been obtained in Petunia sp.. This experiment was carried out to find a favourable condition for the in vitro develop-ment of the excised young ovules of Petunia hybrida Vilm. The results are as follow : (1) The medium containing 6% sucrose was most favourable for development of the free ovules excised 4 days after pollination. And also when osmotic value of the medium were adjusted to equivalent to 6% sucrose solution by adding cucumber fruit-juice, the ovules were developed at same rate of the former. Therefore, it is recognized that high osmotic value of the medium act upon the development of young ovules. (2) When the ovules excised 3 days after pollination were inoculated, the most favourable bsmotic value of a medium was equivalent to 8% sucrose solution which was higher than one L0r culturing the ovules excised 4 days aLter pollination. Moreover, it was observed that the range of osmotic value for culturing younger ovules was narrow than that for older one. Therefore, it is recognized the osmotic value of medium affects more remarkably the development of younger ovules.

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The Inhibiting Effect of EDTA on the Repair of Gamma-ray Induced Lesions in Germinating Barley Seeds

Hikoyuki YAMAGUCHI, Tadao NAITO, Atsushi TATARA

1974 Volume 24 Issue 4 Pages 188-193
Published: August 31, 1974
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.24.188

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[title in Japanese]

[in Japanese]

1974 Volume 24 Issue 4 Pages 194-198
Published: August 31, 1974
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.24.194

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