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Photosynthesis enhanced oxidative stress tolerance in high-yield rice varieties (Oryza sativa var. japonica L.) in the field

文献类型： 外文期刊

作者： Wei, X. D. 1 ; Jin, L. 1 ; Li, X. 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Food Crops, China Natl Ctr Rice Improvement, Jiangsu High Qual Rice R&D Ctr,Nanjing Branch, Nanjing, Jiangsu, Peoples R China

关键词： Rice (Oryza sativa var. japonica L.);Photooxidation;Net photosynthetic rate;Yield component;Antioxidant enzyme

期刊名称：GENETICS AND MOLECULAR RESEARCH （ 2015影响因子：0.764； 五年影响因子：0.912 ）

ISSN： 1676-5680

年卷期： 2016 年 15 卷 3 期

页码：

收录情况： SCI

摘要： The objective of this study was to understand varietal differences in photosynthetic characteristics, chlorophyll fluorescence, antioxidant capability, and yield of japonica rice varieties. Nanjing 44, Oryza sativa var. japonica (average yield of 12.7 t/ha), Nanjing 46, and Nanjing 5055 (average yields of 11.3 and 11.5 t/ha) were included as "super" and high-yield varieties, respectively, whereas Wuyunjing 7 (average yield of 10.2 t/ha) was included as a control variety. These varieties were grown under field conditions in Jiangsu Province, China, in 2010-2012. Different organs (panicle, grain, etc.) were measured, before and after flowering, to identify differences of dry matter accumulation and transformation properties. Photosynthesis, the chlorophyll content, and antioxidant enzyme activities of the flag leaf in the days after flowering (DAF) were also investigated. The results showed that, compared with the other three rice varieties, Nanjing 44 had the highest plant dry weight and number of grains per panicle. It also had a relatively high net flag leaf photosynthetic rate and showed the least inhibition of photosynthesis at noon in DAF, which probably explains the higher yield in this variety. Furthermore, Nanjing 44 also had the highest stem export and conversion rate from stem to grain, exhibiting a strong ability to convert and distribute photosynthetic products. After DAF 42, Nanjing 44 still maintained a high-soluble protein content and a high antioxidant ability in the leaves to clear peroxidation products, which could protect the photosynthetic apparatus of the flag leaves, and maintain the grain-filling activity for longer. The high-yield capability of Nanjing 44 was attributed to its photosynthetic advantages in the leaves during the late developmental stage.

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