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Coordination of root growth and leaf senescence in cotton

China 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 two years. Baimian 1 had better leaf photosynthetic rate or performance index based on light energy absorption, higher root length density (RLD) and better root distribution, and higher root vigor than DP99B, evidenced by higher volume of bleeding sap, in which higher percentage of protein contents was contained. In 2012, DP99B had faster root growth with higher RLD at middle August and higher root vigor at late July than Baimian 1, and the total xylem sap amount of DP99B was 1.7 times that of Baimian 1. After bloom peaking, the higher density of root, more bleeding sap and slower leaf senescence showed the coordination to a great extent, confirming that leaf senescence is regulated by root growth and root vigor in later cotton growth