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Grain yield and lodging-related traits of ultrashort-duration varieties for direct-seeded and double-season rice in Central China

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Journal of Integrative Agriculture 2022年第10期21卷 2888-2899页

作者： WANG Xin-yu XU Le LI Xiao-xiao YANG Guo-dong WANG Fei PENG Shao-bing National Key Laboratory of Crop Genetic Improvement/Hubei Hongshan Laboratory/Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River Ministry of Agriculture and Rural Affairs/College of Plant Science and TechnologyHuazhong Agricultural UniversityWuhan 430070P.R.China

Lodging is the most common constraint on grain yield of direct-seeded *** is limited information about lodging resistance and its related plant traits in direct-seeded and double-season rice(DDR)in Central *** study aims to identify the plant traits that achieve high lodging resistance in ultrashort-duration varieties(about 95 days)of *** experiments were conducted in 2017 and 2018 in Wuxue County,Hubei Province,China,with four ultrashort-duration varieties grown under two nitrogen(N)***-related traits were measured on the 15 th day after heading,and yield and yield attributes were measured at *** grain yield of the four varieties ranged from 4.59 to 7.61 t ha^(-1)across the two N rates,with a total growth duration of 85 to 97 *** differences in lodging index were mainly explained by the bending moment,which was closely related to plant *** resistance did not affect the lodging index *** plant height from 95.4 to 80.5 cm decreased the lodging index by 22.4%but did not reduce grain *** results suggested that reducing plant height was effective in improving the lodging resistance of ultrashort-duration varieties of *** resistance should be enhanced by improving breaking resistance rather than reducing plant height to increase DDR grain yield further.

关键词： direct seeding double-season rice lodging plant height ultrashort growth duration

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