中国麻业科学2026，Vol.48Issue(4)：202-211,10.DOI:10.27053/j.cnki.PFSC.20260405
外源乙烯对苎麻茎秆不同部位解剖结构发育的影响
Effects of Exogenous Ethylene on Anatomical Structure Development in Different Stem Regions of Ramie
摘要
Abstract
To investigate the effects of exogenous ethylene on the development of different anatomical regions in ramie(Boehmeria nivea)stems and their spatial variations,ramie cultivar G52 was used as the experimental material.A bidirectional treatment was conducted using ethephon(ETH)and the ethyl-ene signaling inhibitor silver nitrate(AgNO3),with water serving as the control(CK).Five days after treatment,samples were collected from the upper,middle,and lower segments of the stems.Morphologi-cal changes in the epidermis,phloem,xylem,fiber layer,and individual fiber cells were analyzed using microanatomy and cytological statistical techniques.The results indicated that the ethylene signal signifi-cantly promoted the radial expansion of the phloem and inhibited the excessive thickening of the xylem,whereas inhibiting the ethylene signal induced preferential xylem development.Furthermore,the ethylene-induced thickening of the fiber layer was generally accompanied by a significant decrease in cell density per unit area.The regulatory effects of ethylene on different stem segments exhibited distinct spa-tial variations.In the upper part undergoing primary growth,ethylene primarily promoted transverse cell expansion;in the middle part characterized by active secondary development,exogenous ethylene signifi-cantly enhanced the massive deposition and thickening of the secondary cell walls in individual fiber cells;in the mature lower part,maintaining the endogenous ethylene signal was essential to prevent se-vere basal lignification and to keep fiber cells from shrinking and thinning.These findings demonstrate that ethylene is involved in regulating the anatomical structure formation across different developmental regions of ramie stems,providing a reference for the application of ethylene-based plant growth regulators to mitigate basal lignification and improve both the yield and quality of ramie fibers.关键词
苎麻/乙烯/韧皮部发育/解剖结构Key words
ramie/ethylene/phloem development/anatomical structure分类
农业科技引用本文复制引用
张硕,赵珏,吴霓程,张浩涓,邢虎成..外源乙烯对苎麻茎秆不同部位解剖结构发育的影响[J].中国麻业科学,2026,48(4):202-211,10.基金项目
岳麓山实验室种业专项项目(YLS-2025-ZY02056) （YLS-2025-ZY02056）
湖南省自然科学基金面上项目(2025JJ50167) （2025JJ50167）
国家自然科学基金(32272137) （32272137）
