数字农科院2.0

Dry Matter Accumulation And Phosphorus E.fficiency Response Of Cotton C ultivars To Phosphorus And Drought

文献类型： 外文期刊

作者： Li Yongshen;Guan Xinyuan;Liu Ping;Liu Zhiyong;Wu Zhansheng;Wang Jun

作者机构：

关键词： cotton; drought; dry matter; low phosphorus; phosphorus efficiency

期刊名称： JOURNAL OF PLANT NUTRITION

ISSN： 0190-4167

年卷期： 2017 年 40 卷 16 期

页码：

摘要： Low soil phosphorus (P) availability and drought are the most recognized growth-limiting factors for the cotton production in arid regions. A pot experiment with P-efficient (Xinluzao19, X19) and P-inefficient (Xinluzao19, X26) cotton cultivars was conducted to investigate the effects of P and drought on dry matter accumulation and P efficiency. Results showed that biomass and chlorophyll content of leaves increased significantly with the increase in soil P content, whereas the root:shoot ratio decreased dramatically. Drought increased the root:shoot ratio, but the chlorophyll content of leaves remained stable. The yield of X19 increased with the increase in soil P content. For X26, the highest yield was attained under the medium P content. Under drought conditions, root P efficiency ratio, P absorption efficiency, and P transfer efficiency were all proportional to P concentration, whereas P utilization was inversely proportional. Compared with X26, X19 presented higher P absorption efficiency and P utilization but lower root P efficiency ratio and P transfer efficiency. It suggested thatthe application of phosphate fertilizer under drought could increase the root P efficiency ratio, P absorption efficiency, and P transfer efficiency, thereby enhancing the ability of stress resistance of cotton and significantly increasing biomass as well as cotton yield.

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