The relationships between carbon isotope discrimination and photosynthesis and rice yield under shading
محل انتشار: مجله تولید گیاهان، دوره: 10، شماره: 4
سال انتشار: 1395
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 240
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شناسه ملی سند علمی:
JR_IJPPG-10-4_011
تاریخ نمایه سازی: 17 مهر 1398
چکیده مقاله:
The measurement of carbon isotope discrimination (∆) provides an integrated insight into theresponse of plants to environmental change. To investigate the potential use of ∆ for identifyingshade tolerance in rice, five rice varieties were selected and artificially shaded (53% lightreduction) during the grain-filling period in 2010 and 2011, in Sichuan, China. Shadingtreatment had a significant influence on the ∆ of rice organs, resulting in clear increases in the ∆of stems plus sheaths (∆Sm), rice grains (∆Gm) and rice flour (∆Fm) at maturity, but a reductionin the ∆ of leaves (∆Lg) at the grain-filling stage. The relationships between ∆ and leafphotosynthetic and chlorophyll fluorescence characteristics and grain yield showed a closedependence on plant organs and light regimes. Under shading treatment, photosynthetic ratewas negatively associated with ∆Gm and the ∆ of stems plus sheaths at the grain-filling stage(∆Sg), whereas ∆Sm was significantly (PPSII (PSII), photochemical quenching (qP) and non-photochemical quenching (NPQ).Moreover, grain filling and grain weight under shading treatment were positively correlatedwith ∆Sg, but negatively related to ∆Sm in 2011. In contrast, a significantly (Passociation between grain weight and ∆Lg was observed in 2010. It was found that lower valuesof ∆Lg, ∆Sm and ∆Gm in rice indicated better light-harvesting and light-use capability and alsohigher grain filling and grain weight of rice.
کلیدواژه ها:
نویسندگان
L. Wang
Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture, Sichuan Agricultural University, Chengdu ۶۱۱۱۳۰, China
F. Deng
Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture, Sichuan Agricultural University, Chengdu ۶۱۱۱۳۰, China
T.Q. Lu
Mianyang Institute of Agricultural Sciences, Mianyang ۶۲۱۰۲۳, China.
M. Zhao
Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture, Sichuan Agricultural University, Chengdu ۶۱۱۱۳۰, China.