Leaf chloroplast ultrastructure and photosynthetic properties of a chlorophyll-deficient mutant of rice
文献类型: 外文期刊
作者: Wu, Z. M. 1 ; Zhang, X. 2 ; Wang, J. L. 2 ; Wan, J. M. 2 ;
作者机构: 1.Jiangxi Agr Univ, Minist Educ & Jiangxi Prov, Key Lab Crop Physiol Ecol & Genet Breeding, Nanchang 330045, Peoples R China
2.Chinese Acad Agr Sci, Inst Crop Sci, Natl Key Facil Crop Gene Resources & Genet Improv, Beijing 100081, Peoples R China
关键词: chlorophyll fluorescence;photosynthesis;rice;ultrastructure;violaxanthin
期刊名称:PHOTOSYNTHETICA ( 影响因子:3.189; 五年影响因子:3.38 )
ISSN: 0300-3604
年卷期: 2014 年 52 卷 2 期
页码:
收录情况: SCI
摘要: Leaf chloroplast ultrastructure and photosynthetic properties of a natural, yellow-green leaf mutant (ygl1) of rice were characterized. Our results showed that chloroplast development was significantly delayed in the mutant leaves compared with the wild-type rice (WT). As leaves matured, more grana stacks formed concurrently with increasing leaf chlorophyll (Chl) content. Except for the lower intercellular CO2 concentration, the ygl1 plants had a higher leaf net photosynthetic rate, stomatal conductance, and transpiration rate than those of the WT plants. Under equal amounts of Chl, the excitation energy of PSI and PSII was much stronger in the mutant than that in the WT. The ygl1 plants showed higher nonphotochemical quenching and lower photochemical quenching. They also exhibited higher actual photochemical efficiency of PSII with a higher electron transport rate. Under the light of 200 mol(photon) m(-2) s(-1), the ygl1 mutant showed lesser deepoxidation of violaxanthin in the xanthophyll cycle than WT, but it increased substantially under strong light conditions. In conclusion, the photosynthetic machinery of the ygl1 remained stable during leaf development. The plants were less sensitive to photoinhibition compared with WT due to the active xanthophyll cycle. The ygl1 plants were efficient in both light harvesting and conversion of solar energy.
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