Effects of Nuclear and Cytoplasmic Genes Altering Chlorophyll Loss on Gas Exchange during Monocarpic Senescence in Soybean

概要

論文の詳細を見る
Several genes can alter the yellowing processes that normally occur during pod development and monocarpic senescence in soybean. CytG and d_1 + d_2 cause the leaves and seeds to stay green at maturity. G blocks yellowing of the seed coat but not the leaves or embryos. By contrast, another gene, y_3, causes earlier yellowing of the leaves. This paper examines the effects of these genes on photosynthesis and some related parameters of the senescence syndrome in near-isogenic backgrounds (cv. Clark). Neither cytG nor d_1d_2 delays the decline in photosynthetic rate during monocarpic senescence relative to Clark; while Gd_1d_2 does. Again, y_3 causes an earlier decrease. Similarly, neither cytG nor d_1d_2 alters the decline in stomatal conductance and transpiration, which occurs at the end of podfill; however, Gd_1d_2 delays it and y_3 advances it. Neither cytG nor d_1d_2 prevents the rise in intercellular CO_2 during podfill, while Gd_1d_2 does, and y_3 promotes it. These changes in intercellular CO_2 may reciprocally reflect the status (maintenance for Gd_1d_2 and early loss for y_3) of the photosynthetic enzymes. Gd_1d_2, d_1d_2 and cytG do not appreciably affect leaf blade abscission; however, y_3 prevents it. Gd_1d_2 increases the dry weight seed yield, and y_3 decreases it. Gd_1d_2 inhibits several components in the senescence process, while cytG seems to affect mainly chlorophyll loss and y_3 may act more broadly than just accelerating senescence. Clearly, the stay-green trait can be caused by more than one genetic locus, and it may or may not maintain photosynthesis.
日本植物生理学会の論文

Effects of Nuclear and Cytoplasmic Genes Altering Chlorophyll Loss on Gas Exchange during Monocarpic Senescence in Soybean

スポンサーリンク

概要

著者

関連論文

スポンサーリンク