Effect of Heat Stress on the Boll Setting Quality of Island Cotton on Different Fruiting Branches

doi:10.3969/j.issn.1000-6362.2019.11.003

Abstract

Abstract: In order to study the effects of net photosynthetic rate, boll setting rate, yield and quality of island cotton on different fruiting branches under different warming days, the warming experiment on island cotton with plastic shed was conducted under the flowering period, taking two cotton varieties(XH43 and XH49)with different heat tolerances as material, and 3 different warming days treatments were designed: H3 (3 days shading), H6 (6 days shading), H9 (9 days shading). The natural temperature in the field was used as the control (CK). The results showed that heat stress reduces the yield and yield components of XH43 and XH49. Among them, H6 and H9 treatments reached significant levels. Heat stress significantly decreased the boll number, boll weight, lint percentage and seed cotton yield of the middle fruit branch, but significantly increased the boll number of the upper fruit branch and promoted the yield of the upper fruit branch. Heat stress had no significant effect on the fiber quality of XH43 and XH49, but resulted in a significant decrease in the upper half mean length, uniformity index and breaking tenacity of the upper fruit branch. However, heat stress significantly increased the breaking tenacity of upper fruit branches, in which H6 and H9 treatments reached a significant level, which increased by 2.19% ?5.12% and 4.48%?7.59%, respectively, compared with the control. The changes of yield and quality of different fruit branches of XH49 were greater than those of XH43 under heat stress. The results showed that the effect of heat stress on XH49 was more serious. Short-term heat stress will lead to a large number of bolls shedding and development hindering of cotton bolls in the middle fruit branches during the boll stage. The net photosynthetic rate of cotton treated with H6 and H9 was significantly higher than that of the control, which enhanced the photosynthetic capacity of cotton in the later stage, and then increased the boll number, yield and breaking tenacity of upper fruit branches.

Key words: Island cotton, Heat stress, Boll stage, Yield, Fiber quality

CHEN Zhen, ZHANG Ju-song, CHEN Ping, ZHANG Wei-tao, Abudukadier·kuerban, CUI Jian-ping. Effect of Heat Stress on the Boll Setting Quality of Island Cotton on Different Fruiting Branches[J]. Chinese Journal of Agrometeorology, 2019, 40(11): 692-701.

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