【作者】 李传宗； 刘丽媛； 李亚兵； 杨代刚； 王国平； 杨北方； 冯璐； 王占彪； 雷亚平； 范正义； 杜文丽； 支晓宇； 韩迎春；

【Author】 Li Chuanzong;Liu Liyuan;Li Yabing;Yang Daigang;Wang Guoping;Yang Beifang;Feng Lu;Wang Zhanbiao;Lei Yaping;Fan Zhengyi;Du Wenli;Zhi Xiaoyu;Han Yingchun;Institute of Cotton Research,Chinese Academy of Agricultural Sciences/State Key Laboratory of Cotton Biology;

【机构】 中国农业科学院棉花研究所/棉花生物学国家重点实验室；

【摘要】 基于中棉所63杂交种较其亲本的杂种优势,采用空间统计学的方法,研究了不同生育时期中棉所63杂交种及其亲本冠层光合有效辐射的空间分布规律,冠层光截获与叶面积指数(LAI)和生物量积累的关系及中棉所63杂交种杂种优势的形成机制。研究结果表明:中棉所63杂交种冠层iPAR呈"V"字型变化趋势,株型较紧凑,冠层横向和纵向光分布均匀,群体上中下部均能接受适宜的光辐射。父本冠层荫蔽,冠层中下部透光性差,不利于中下部成铃和吐絮。母本较中棉所63杂交种株型松散,果枝较长,导致冠层下部较荫蔽,不利于下部果枝成铃的生长和吐絮。合理的株型结构与光截获,较高的LAI和较多的干物质积累及适当的生殖干物质转化比重是中棉所63产量显著高于父母本、表现超亲优势的形成机制。研究结果将为中棉所63的推广应用提供理论支撑。更多还原

【Abstract】 Based on the heterosis of CCRI 63 hybrids comparing with its parents and using spatial statistical methods,present research investigated the photosynthetically active radiation distribution in different growth stages of the CCRI 63 hybrids and its parents within the canopy;revealed the relationship between light interception(iPAR),leaf area index(LAI) and biomass accumulation;and clarified the mechanism of the heterosis of CCRI 63.These results showed that the iPAR variation of CCRI 63 hybrids exhibited "V" shapes within the canopy,the distribution of light is even at horizontal and vertical direction within the canopy for the reason of its relatively compact plant type thus the whole population receiving appropriate light radiation.However,the male parent with shaded canopy and bad light transmission is not conducive to the boll grow and open in the middle and lower part of the canopy.While,the loose plant type and longer branch of the female parent lead to a shaded canopy in lower part,thus being detrimental to the boll growth in this part of the canopy.The mechanism of CCRI 63 hybrids significantly higher than their parents in yield are reasonable plant type structure,light interception,higher LAI,more dry matter accumulation and appropriate proportion of dry matter.This study may provide theoretical support for the extensive application of CCRI 63.更多还原