水稻生育后期叶片早衰突变体的光合特性与叶绿体超微结构观察

doi:10.3724/SP.J.1006.2012.00871

Abstract

Abstract: The influences of leaf premature senescence at the filling stage on photosynthesis rate, chlorophyll fluorescence and chloroplast ultra-structure were investigated using Zhehui 7954 (an excellent indica restorer line) and its leaf senescence mutant (psf). The results indicated that the psf mutant had significantly negative influence on the numbers of filling grains per panicle, seed-setting rate, 1000-grain weight and yield per plant, especially on the numbers of filling grains per panicle and seed-setting rate. Compared with CK, psf also exhibited dramatically lower chlorophyll content, the ratio of chlorophyll a/b, photosynthetic rate (P_n) and chlorophyll fluorescence parameters F_v/F_o and F_v/F_m at filling stage, which were further lowered in the process of maturity. No visual changesin the ultra-structure of mesophyll cells and chloroplasts were observed for psf, showing its intact thylakoid, plastoglobuli size and shape. However, abnormal shape and stacking parallel distribution of chloroplasts, near the cell wall, the degraded grana, the plastoglobuli residue and the destroyed chloroplast membrane could be detected in psf mesophyll cells, in which the appearance of stacking and spherical chloroplasts was responsible for the dropped P_n in psf leaf prior to the degradation and disintegration of thylakoid and grana membrane, thereby caused the decrease of F_v/F_oand F_v/F_m.

Key words: Rice (Oryza sativa L.)')">

Rice (Oryza sativa L.), psf mutant, Ultra-structure, Photosynthesis rate, Chlorophyll fluorescence

WANG Fu-Biao,HUANG Fu-Deng,CHENG Fang-Min,LI Zhao-Wei,HU Dong-Wei,PAN Gang,MAO Yu-Chan. Photosynthesis and Chloroplast Ultra-structure Characteristics of Flag Leaves for a Premature Senescence Rice Mutant[J].Acta Agron Sin, 2012, 38(05): 871-879.

”. Please open it by linking:https://zwxb.chinacrops.org/EN/abstract/abstract5102.shtml" name="neirong"> Rice (Oryza sativa L.)|psf mutant|Ultra-structure|Photosynthesis rate|Chlorophyll fluorescence

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URL: https://zwxb.chinacrops.org/EN/10.3724/SP.J.1006.2012.00871

https://zwxb.chinacrops.org/EN/Y2012/V38/I05/871

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Photosynthesis and Chloroplast Ultra-structure Characteristics of Flag Leaves for a Premature Senescence Rice Mutant

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