Dry matter accumulation and phosphorus efficiency response of cotton cultivars to phosphorus and drought |
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Authors: | Wang Jun Liu Ping Liu Zhiyong Wu Zhansheng Li Yongshen |
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Affiliation: | 1. Agricultural Techniques Extension Center, Xinjiang Agricultural Reclamation Academy of Sciences, Shihezi, Xinjiang, China;2. Institute of Cotton, Xinjiang Agricultural Reclamation Academy of Science, Shihezi, Xinjiang, China;3. College of Chemistry and Chemical Engineering, Shihezi University, Shihezi, Xinjiang, China |
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Abstract: | 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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Keywords: | cotton drought dry matter low phosphorus phosphorus efficiency |
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