Photochemical efficiency of PSII and characteristics of photosynthetic CO2 exchange in Indica and Japonica subspecies of rice and their reciprocal cross F-1 hybrids under photoinhibitory conditions

文献类型： 外文期刊

第一作者： Ji, BH

作者： Ji, BH;Jiao, DM

作者机构：

关键词： D1 protein;photochemical efficiency of PSII;photoinhibition of photosynthesis;photorespiration;hybrid rice

期刊名称：ACTA BOTANICA SINICA （ 影响因子：0.599； ）

ISSN： 0577-7496

年卷期： 1999 年 41 卷 5 期

页码：

收录情况： SCI

摘要： To elucidate photoinhibitory characteristics and their genetic background in rice (Oryza sativa L.), PS II electron transport activities, D1 protein contents, chlorophyll a fluorecence parameters, net photosynthetic rates (P-N), photorespiratory rates (P-R) and RuBPCase/Oase activities were measured, and kinetic analysis of RuBPCase was carried out in indica and japonica subspecies of rice and their reciprocal cross F-1 hybrids after photoinhibitory treatment in 21% O-2 and CO2-free gases under a PFD of 1000 mu mol photons . m(-2) . s(-1) for 3 h. The results are as follows: Japonica rice, keeping less net degradation of D1 protein and maintaining higher PSII electron transport activities and photo chemical efficiency of PSII (F-v/F-m), was more tolerant to photo inhibition as compared with indica rice. However, the D1 protein contents, PSII electron transport activities and F-v/F-m in their reciprocal cross F1 hybrids, though lying between the values of their parents, were closer to those in their maternal lines rather to their paternal lines. Characteristics of photosynthetic CO2 exchange were further observed. The P-R was relatively stable, yet the P-N decreased obviously and, as a results, the P-R/P-N increased in all genotypes. There were more decrease in P-N and more increase in P-R/P-N in photoinhibition-sensitive indica than in the photoinhibition-tolerant japonica. However, the P-R/P-N in the reciprocal cross F-1 hybrids, though lying between the values of their parents, was closer to that in their maternal lines than to paternal lines. No obvious changes were observed in the activities of RuBPCase/Oase, K-m(CO2) and V-max(CO2) of RuBPCase in indica and japonica rice and their reciprocal cross F1 hybrids be fore and after photoinhibitory treatment. Furthermore, markedly positive correlation between D1 protein contents and F-v/F-m (r = -0.9501), and negative correlation between D1 protein contents and P-R/P-N (r = 0.976 8) were demons trated. These results infer that the D1 protein encoded by the plastid gene from maternal line was the molecular basis of photoinhibitory characteristics and their physiological inheritance.

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