Coordination of root growth and leaf senescence in cotton

WANG Su-Fang1 XUE Hui-Yun1 ZHANG Zhi-Yong1 TANG Ju-Xiang1

(1.Henan Institute of Science and Technology/Henan Collaborative Innovation Center of Modern Biological Breeding/Henan Key Laboratory for Molecular Ecology and Germplasm Innovation of Cotton and Wheat, Xinxiang, Henan, China 453003)
【Knowledge Link】seed cotton

【Abstract】Two cotton cultivars, Baimian 1 and DP99B, were used to investigate the root growth and vigor, leaf senescence, and yield in the field during 2011–2012. Baimian 1 produced higher cotton fiber yield than DP99B during the two years. Baimian 1 had better leaf photosynthetic rate or performance index based on light energy absorption, higher root length density (RLD), better root distribution, and higher root vigor than DP99B, evidenced by higher volume of bleeding sap, in which higher percentage of protein was contained. In 2012, DP99B had faster root growth with higher RLD in middle August and higher root vigor in late July than Baimian 1. The total xylem sap amount of DP99B was 1.7 times that of Baimian 1. After the full-bloom stage, the higher root density, more bleeding sap, and slower leaf senescence showed coordination to a great extent, confirming that leaf senescence was regulated by root growth and root vigor in late cotton growth season.

【Keywords】 cotton; root distribution ; root length density ; bleeding sap ; leaf senescence ;

【DOI】

【Funds】 National Natural Science Foundation of China (31271648, 31571600)

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(Translated by GAO XP)

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This Article

ISSN:0496-3490

CN:11-1809/S

Vol 46, No. 01, Pages 93-101

January 2020

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Article Outline

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Abstract

  • 1 Materials and methods
  • 2 Results
  • 3 Discussion
  • 4 Conclusion
  • References