亚热带农业研究2023，Vol.19Issue(4)：234-240,7.DOI:10.13321/j.cnki.subtrop.agric.res.2023.04.003
遮荫及环剥对红锥幼苗下冠层叶片抗性生理的影响
Effects of shading and girdling on resistance physiology of leaves in lower canopy of Castanopsis hystrix
摘要
Abstract
[Purpose]Effects of different shading and girdling treatments on resistance physiology of leaves in the lower canopy of Castanopsis hystrix seedlings were compared to understand the response mechanism of C.hystrix to shading and girdling.[Method]Canopy and stem below 1/3 part of 2-year-old C.hystrix seedlings were treated with different shading(25%,45%,70%and 85%shading)and girdling treatments by 2-factor randomized block group design,with unshaded being the control,to investigate the effects of shading and girdling on osmotic regulator,protective enzyme activity and MDA content of leaves in the lower canopy of C.hystrix.[Result]Contents of soluble sugar,soluble protein and proline of leaves in the lower canopy of C.hystrix decreased with en-hanced shading treatment.Catalase(CAT)and superoxide dismutase(SOD)activities both increased firstly and then decreased with the increase of shading,while it was the opposite for peroxidase(POD).CAT and SOD activities both peaked at 45%shading under shading treatment solely;under the combined treatments of shading and girdling,CAT and SOD activities peaked at 45%and 25%shading,respectively.Contrarily,POD activity was the lowest at 45%and 25%shading under shading treatment solely and combined treatments,respectively.Malondialdehyde(MDA)content decreased firstly,minimized at 45%shading under solely shading and combined treatment,and then started to rebound.Compared with the treatments without girdling,leaves in the lower canopy of C.hystrix were lower in the contents of soluble sugar,soluble protein,proline and MDA,but higher in the activities of CAT,POD and SOD.[Conclusion]Leaves in the lower canopy of C.hystrix were adaptable to shading stress mainly by coordinated activities of SOD,POD and CAT,in combination of higher protective enzyme activities arisen from girdling.关键词
抗性生理/局部遮荫/环剥/下冠层/红锥Key words
resistance physiology/partial shading/girdling/lower canopy/Castanopsis hystrix分类
农业科技引用本文复制引用
杨丽萍,张燕,杨康,韦宇,滕维超,谭长强..遮荫及环剥对红锥幼苗下冠层叶片抗性生理的影响[J].亚热带农业研究,2023,19(4):234-240,7.基金项目
广西自然科学基金项目"红锥对下冠层枝叶遮阴的响应机制"(2020GXNSFBA297051) （2020GXNSFBA297051）
中央引导地方科技发展资金项目"红锥核心种质资源库及共享服务平台建设"(桂科ZY21195049) （桂科ZY21195049）
广西自筹经费林业科技项目"红锥定向培育集成技术研究"(桂林科研[2022ZC]第 31 号). （桂林科研[2022ZC]第 31 号）
