应用生态学报2017，Vol.28Issue(9)：2923-2931,9.DOI:10.13287/j.1001-9332.201709.025
紫花苜蓿种子萌发及幼苗生理特性对PEG6000模拟渗透势的响应
Response of seed germination and seedling physiological characteristics of Medicago sativa to the simulated osmotic potential of PEG6000
摘要
Abstract
The responses of seed germination and seedling physiological characteristics of alfalfa to different osmotic potentials were studied with the varied concentrations of PEG6000 (0％,5％,10％,15％,20％,25％ and 30％ corresponding to osmotic potential of O,-0.06,-0.17,-0.32,-0.53,-0.79 and-1.10 MPa,respectively) in this study.Five indexes of seed germination increased firstly and then decreased with a decrease of osmotic potential.Indexes of germination and vigor were the highest when osmotic potential was-0.06 MPa.Rate,potential and index germination reached the maximum when osmotic potential was-0.17 MPa.Seedling POD,SOD,CAT activities and chlorophyll content increased firstly and then decreased with a decrease of osmotic potential,and indexes reached the maximum when osmotic potential was-0.17 MPa.The ratio of chlorophyll a to chlorophyll b decreased firstly and then increased with a decrease of osmotic potential,and it reached the minimum when osmotic potential was-0.06 MPa.Pro,MDA and REC increased with a decrease of osmotic potential.Seed germination and the comprehensive indexes of seedling physiology were optimal for seed germination when osmotic potential was-0.06-0.17 MPa.Seed germination was restrained when the osmotic potential was lower than-0.79 MPa.关键词
渗透势/种子萌发/生理特性/紫花苜蓿Key words
osmotic potential/seed germination/physiological characteristics/Medicago sativa引用本文复制引用
陈士超,王猛,汪季,高永,刘宗奇,王香..紫花苜蓿种子萌发及幼苗生理特性对PEG6000模拟渗透势的响应[J].应用生态学报,2017,28(9):2923-2931,9.基金项目
本文由林业公益性行业科研专项(201204205)资助 （201204205）
This work was supported by the Special Fund for Forest Scientific Research in the Public Welfare (201204205). （201204205）
