Genotypic variation in spatiotemporal distribution of canopy light interception in relation to yield formation in cotton

Journal of Cotton Research

Zhanbiao WANG¹  Xiaoyu ZHI¹  Xiaofei LI¹  Yaping LEI¹  Yingchun HAN¹  Beifang YANG¹  Zhengyi FAN²  Fangfang XING²  Wenli DU²  Lu FENG²  Shiwu XIONG²  Guoping WANG²  Yabing LI² 

[1] Institute of Cotton Research of Chinese Academy of Agricultural Sciences, Anyang, China;Zhengzhou Research Base, State Key Laboratory of Cotton Biology, Zhengzhou University, Zhengzhou, China

关键词: Cotton cultivars;    Light interception;    Plant type structure;    Boll distribution;    Yield;   

DOI  :  10.1186/s42397-018-0012-z

学科分类：农业科学（综合）

来源: Springer

【 摘 要 】

Within-canopy interception of photosynthetically active radiation (PAR) impacts yield and other agronomic traits in cotton (Gossypium hirsutum L.). Field experiments were conducted to investigate the influence of 6 cotton varieties (they belong to 3 different plant types) on yield, yield distribution, light interception (LI), LI distribution and the relationship between yield formation and LI in Anyang, Henan, in 2014 and 2015. The results showed that cotton cultivars with long branches (loose-type) intercepted more LI than did cultivars with short branches (compact-type), due to increased LI in the middle and upper canopy. Although loose-type varieties had greater LI, they did not yield significantly higher than compact-type varieties, due to decreased harvest index. Therefore, improving the harvest index by adjusting the source-to-sink relationship may further increase cotton yield for loose-type cotton. In addition, there was a positive relationship between reproductive organ biomass accumulation and canopy-accumulated LI, indicating that enhancing LI is important for yield improvement for each cultivar. Furthermore, yield distribution within the canopy was significantly linearly related to vertical LI distribution. Therefore, optimizing canopy structure of different plant type and subsequently optimizing LI distribution within the cotton canopy can effectively enhance the yield.

【 授权许可】

CC BY