草业科学2018，Vol.35Issue(2)：348-356,9.DOI:10.11829/j.issn.1001-0629.2017-0227
陕北黄土丘陵沟壑区主要植物种子对干旱胁迫的萌发响应及抗旱性评价
Evaluation of germination response and the resistance of main plant species seedling to drought stress in the hill-gullied Loess Plateau region of northern Shaanxi
摘要
Abstract
In the hill-gullied Loess Plateau region of northern Shaanxi,lack of soil water is a dominant factor affecting vegetation restoration,and the effect of drought stress on seed germination is a key limiting factor for plant regeneration.This experiment was conducted to estimate the seed germination characteristics and drought resistance of 16 main plant species in the hill-gullied Loess Plateau region.Different concentrations of polyethylene glycol (PEG-6000) solution were used to simulate the drought stress in this study.The results showed that germination of all seeds was subjected to different degrees of inhibition with the increase of PEG concentration.Generally,with drought stress increase,the seed germination time lag was prolonged,or even the seeds did not germinate,and the germination potential,germination rate,germination index,and drought resistance index of all seeds tended to decline.However,slight drought stress (50 g · L-1) promoted the germination of some seeds and increased seed germination potential and germination rate.The comprehensive evaluation of the relative germination potential,relative germination rate,relative germination index,and drought resistance index of 16 species by the membership function method indicated that the drought resistance of Bidens pilosa,Artemisia scoparia,and Setaria viridis was the strongest,and that of Stipa grandis was the weakest.关键词
PEG-6000/干旱胁迫/种子萌发/黄土丘陵沟壑区/抗旱性Key words
PEG-6000 (polyethylene glycol)/drought stress/seed germination/hill-gullied Loess Plateau region/drought resistance分类
农业科技引用本文复制引用
葛芳红,王宁,胡澍,周正朝,蒋平海..陕北黄土丘陵沟壑区主要植物种子对干旱胁迫的萌发响应及抗旱性评价[J].草业科学,2018,35(2):348-356,9.基金项目
国家自然科学基金项目(41501290、41571260) （41501290、41571260）
黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金(A314021402-1512) （A314021402-1512）
