Flumetralin and dimethyl piperidinium chloride alter light distribution in cotton canopies by optimizing the spatial configuration of leaves and bolls  

作　　者：LIANG Fu-bin YANG Cheng-xun SUI Long-long XU Shou-zhen YAO He-sheng ZHANG Wang-feng 

机构地区：[1]The Key Laboratory of Oasis Eco-Agriculture,Xinjiang Production and Construction Corps,Shihezi University,Shihezi 832003,P.R.China [2]Manasi County Development and Reform Commission,Manasi 832200,P.R.China

出　　处：《Journal of Integrative Agriculture》2020年第7期1777-1788,共12页农业科学学报（英文版）

基　　金：This study was financially supported by the 948 Program from Ministry of Agriculture of China(2016-X25);the National Key Technology R&D Program of China(2014BAD09B03);The authors are grateful to Dr.William J.Gale(Shihezi University,China)for his helpful revision of the paper especially in English language.

摘　　要：Plant growth regulators(PGRs)are frequently used to adjust cotton growth and development.The objectives of this study were to determine how PGRs affect plant morphology,light distribution and the spatial distribution of leaves and bolls within the cotton canopy.The field experiments were carried out at Shihezi(Xinjiang Uyghur Autonomous Region,China)in 2014 and 2015.The experiment included two PGR treatments:(i)flumetralin(active ingredient(a.i),N-N-ethy)-2,6-dinitro-4-aniline and(i)mepiquat chloride(ai,1-dimethyl-piperidiniuchloride)plus flumetralin.No PGR(manual topping)was applied in the control treatment.The chemically-topped plants were taller and had more main stem internodes than the manually-topped plants.Furthermore,the PGRs significantly reduced the length of fruiting branches in the upper canopy,resulting in a more compact canopy.The maximum leaf area index was signifcantly greater in the chemically-topped treatments than that in the control.In particular,the PGRs increased leaf area index by 25%in the upper canopy.The leaf area duration was also longer in the chemically-topped treatments than in the control.Compared with the control,the chemically-topped treatments increased canopy diffuse non-interceptance by 35.75%in the upper canopy layer,while reducing the fraction of intercepted photosynthetically active radiation by 14.45%in the upper canopy layer.Light transmittance in the upper and middle canopy layers was greater in the chemically-topped treatments than in the control,which increased boll numbers in both the upper canopy and the middle canopy.However,the chemically-topped treatments resulted in less light-leakage through the lower canopy layer during the late growth stages,which had a tendency to increase boll numbers in the whole canopy.In summary,the PGRs optimized canopy shape,light distribution and the spatial distribution of bolls and leaves.

关 键 词：COTTON chemical topping leaf spatial distribution light distribution boll spatial distribution 

分 类 号：S562[农业科学—作物学]