Chloroplast ultrastructure regeneration with protection of photosystem II is responsible for the functional stay-green' trait in wheat

被引:32
|
作者
Luo, P. G. [1 ,3 ]
Deng, K. J. [2 ]
Hu, X. Y. [1 ]
Li, L. Q. [1 ]
Li, X. [1 ]
Chen, J. B. [1 ]
Zhang, H. Y. [1 ]
Tang, Z. X. [1 ]
Zhang, Y. [2 ]
Sun, Q. X. [3 ]
Tan, F. Q. [1 ]
Ren, Z. L. [1 ,2 ]
机构
[1] Sichuan Agr Univ, State Key Lab Plant Breeding & Genet, Yaan 625014, Sichuan, Peoples R China
[2] Univ Elect Sci & Technol China, Sch Life Sci & Technol, Chengdu 610054, Peoples R China
[3] China Agr Univ, Coll Agr & Biotechnol, Beijing 100193, Peoples R China
来源
PLANT CELL AND ENVIRONMENT | 2013年 / 36卷 / 03期
基金
中国国家自然科学基金;
关键词
delayed senescence; grana thylakoid; PSII activity; suppression subtractive hybridization (SSH); unsaturated fatty acids; wheat (Triticum aestivum L; HARVESTING COMPLEX-II; LEAF SENESCENCE; REGULATES CHLOROPHYLL; FATTY-ACIDS; PROTEIN; MUTANT; DEGRADATION; DEFICIENT; MEMBRANES; GENE;
D O I
10.1111/pce.12006
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
CN17 is a functional stay-green wheat variety that exhibits delayed leaf senescence and enhanced photosynthetic competence. To better understand these valuable traits, levels of chlorophyll a and b, soluble proteins, unsaturated fatty acids, and other components of CN17 were assayed. In addition, chloroplast ultrastructure, chloroplast number, and differences in gene expression between CN17 and a control variety, MY11, were examined. By 21 d post-anthesis (DPA), CN17 leaves exhibited a significantly higher maximal photochemical efficiency for photosystem II (PSII) (Fv/Fm) and a significantly higher efficiency of excitation capture by open PSII reaction centres (Fv'/Fm'). In addition, chlorophyll degradation in CN17 was delayed by approximately 14 d, and was not blocked as observed in cosmetic stay-green phenotypes. The soluble protein content (Ps) of CN17 was higher than MY11 at all timepoints assayed, and the ratio of unsaturated to saturated fatty acids was significantly higher. CN17 also exhibited isolated granal lamellae associated with vesicles and diminished peroxidation, and between 35 and 42 DPA, a sharp decrease in chloroplast number was detected. Taken together, these results strongly support the hypothesis that chloroplast ultrastructure regeneration is responsible for the functional stay-green trait of CN17, and gene expression data provide insight into the mechanistic details.
引用
收藏
页码:683 / 696
页数:14
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