<紀要論文>
Studies on the alloplasmatic effect in tribe Brassiceae : Ⅱ. Several conspicuous characteristics appeared in the carinata-cytoplasmic pekinensis plant

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概要 The pekinensis plant having carinata's cytoplasm, a product of nucleus-substitution, revealed conspicuous characters ascribable to an alloplasmatic effect. In this report is given an account of those ...characters. 1. The leaves were somewhat slender and the flowers were smaller-sized in this alloplasmatic plant as compared with a normal pekinensis plant. 2. The plant varied in the rate of its growth under different conditions, growing at a much reduced rate and revealing marked signs of chlorophyll deficiency under adverse conditions. Retarded growth and chlorophyll deficiency are so closely related to each other with this plant as to admit no separate occurrence. However, as a (10Ⅱ + 1Ⅰ) plant having carinata's cytoplasm showed its retarded growth, not revealing a trace of chlorophyll deficiency, it may be safely asserted that the retarded growth is unquestionably ascribable to the carinata-cytoplasmic effect in this plant. 3. Morphological and biochemical investigations disclosed that, with the plants ranging nine generations (B_3F_4-B_9F_12), chlorophyll deficiency, the most conspicuous character in those plants, was somewhat strengthened under strong light and low temperature conditions (about 5℃ or lower), showing considerable variation in its manifestation from individual to individual. Chlorophyll-deficient leaves in those alloplasmatic plants contained no doubt chlorophylls in an insufficient quantity, and accompanied also the quantitative alterations resulted through the changes in ratio of the chlorophyll a: b and that of chlorophyll; carotenoid. It was found on further examination that, in the (10Ⅱ + 1Ⅰ) plant having carinata's cytoplasm, the added extra-chromosome acted upon the carinata-cytoplasmic effect and redeemed the chlorophyll-defect, also increasing the carotenoid content. 4. The plant was normal in its pollen-fertility under any environmental conditions, and either almost normal or subnormal in its seedfertility according as it had been growing up in a greenhouse or under an adverse condition. As reduced seedfertility was invariably attended with retarded growth in this plant, it seems that this decrease of seed-fertility may not be directly attributable to the alloplasmatic effect.続きを見る

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登録日 2012.07.20
更新日 2021.02.05

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