Ideotype Population Exploration: Growth, Photosynthesis, and Yield Components at Different Planting Densities in Winter Oilseed Rape (Brassica napus L.)

文献类型： 外文期刊

第一作者： Ma, Ni

作者： Ma, Ni;Yuan, Jinzhan;Li, Ming;Li, Jun;Zhang, Liyan;Liu, Lixin;Naeem, Muhammad Shahbaz;Zhang, Chunlei;Li, Ming

作者机构：

期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）

ISSN： 1932-6203

年卷期： 2014 年 9 卷 12 期

页码：

收录情况： SCI

摘要： Rapeseed is one of the most important edible oil crops in the world and the seed yield has lagged behind the increasing demand driven by population growth. Winter oilseed rape (Brassica napus L.) is widely cultivated with relatively low yield in China, so it is necessary to find the strategies to improve the expression of yield potential. Planting density has great effects on seed yield of crops. Hence, field experiments were conducted in Wuhan in the Yangtze River basin with one conventional variety (Zhongshuang 11, ZS11) and one hybrid variety (Huayouza 9, HYZ9) at five planting densities (27.0x10(4), 37.5x10(4), 48.0x10(4), 58.5x10(4), 69.0x10(4) plants ha(-1)) during 2010-2012 to investigate the yield components. The physiological traits for high-yield and normal-yield populations were measured during 2011-2013. Our results indicated that planting densities of 58.5x10(4) plants ha-1 in ZS11 and 48.0x10(4) plants ha(-1) in HYZ9 have significantly higher yield compared with the density of 27.0x10(4) plants ha(-1)for both varieties. The ideal silique numbers for ZS11 and HYZ9 were similar to 0.9x10(4) (n m(-2)) and,16104 (n m(-2)), respectively, and ideal primary branches for ZS11 and HYZ9 were similar to 250 (n m(-2)) and,300 (n m(-2)), respectively. The highest leaf area index (LAI) and silique wall area index (SAI) was similar to 5.0 and 7.0, respectively. Moreover, higher leaf net photosynthetic rate (Pn) and water use efficiency (WUE) were observed in the high-yield populations. A significantly higher level of silique wall photosynthesis and rapid dry matter accumulation were supposed to result in the maximum seed yield. Our results suggest that increasing the planting density within certain range is a feasible approach for higher seed yield in winter rapeseed in China.

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