Relationship of photosynthetic efficiency and seed-setting rate in two contrasting rice cultivars under chilling stress

文献类型： 外文期刊

第一作者： Wang, L. -Z.

作者： Wang, L. -Z.;Wang, L. -M.;Xiang, H. -T.;Luo, Y.;Li, R.;Li, Z. -J.;Wang, C. -Y.;Meng, Y.

作者机构：

关键词： abscisic acid;chlorophyll fluorescence;malondialdehyde;peroxidase;proline;superoxide dismutase

期刊名称：PHOTOSYNTHETICA （ 影响因子：3.189； 五年影响因子：3.38 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Low temperature during the vegetative stage affects rice (Oryza sativa L.) seed-setting rate in Heilongjiang province at Northeast China. However, little is known about changes of the photosynthetic rate and physiological response in contrasting rice cultivars during chilling periods. In this study, two rice cultivars with different chilling tolerance were treated with 15A degrees C from June 27 to July 7. The chilling-susceptive cultivar, Longjing11 (LJ11), showed a significant decrease in a ripening rate and seed-setting rate after being treated for four days, whilst chilling-tolerant cultivar, Kongyu131 (KY131), was only slightly affected after 4-d treatment. The photosynthetic activities, chlorophyll contents, and antioxidative enzyme activities in LJ11 decreased significantly along with the chilling treatment. The decrease in -carotene contents might play a role as it could cause direct photooxidation of chlorophylls and lead to the inhibition of the photosynthetic apparatus. In the meantime, no significant damage was found in leaves of KY131 from June 27 to July 11. In conclusion, the chilling-tolerance mechanism of rice is tightly related to the photosynthetic rate, metabolism of reactive oxygen species, and scavenging system in the vegetative stage.

分类号： Q94

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