干旱区地理2011，Vol.34Issue(1)：100-106,7.
几种荒漠植物种子萌发对干旱胁迫的响应及其抗旱性评价研究
Response to droughty stresses and drought-resistances evaluation of seed germination of four desert vegetation
摘要
Abstract
By the way of simulation drought, the seeds germination and seedling growth of four desert vegetations of Kalidium foliatum, Lycium nahenicum, Artemisia arenaria and Artemisia ordosica were tested in distilled water appended PEG -6000 (solution osmotic potentials were changed from 0 to -2.1 MPa), darkness and 25 ℃ for ten days. The results show that drought stress has a significant effect on seed germination and seedling growth of the four desert vegetations( P ＜0.05 ), and the lowest thresholds of osmotic potential for seed germination are - 1.5 MPa in Kalidium foliatum and -0.9 MPa in Lycium ruthenicum, Artemisia arenaria and Artemisia ordosica. With the aggravating of drought stress, the total germination rates, plumule lengths, radical lengths, seedling fresh weights and vigor indexes of four desert vegetations are tended to decline, which are smaller than that of the comparison ones. The comprehensive evaluation of the relative seed germination rates, relative germination days, relative plumule lengths, relative radical lengths, relative seedling fresh weights, drought resistance indexes and relative vigor indexes of four vegetations by the average subordinative function method indicates that the drought resistances of the four vegetations are decreased in the order of Kalidium foliatum ＞ Artemisia arenaria ＞ Artemisia ordosica ＞ Lycium ruthenicum. Basing on the studies and reported literature, it found that the extent of seed germination drought-resistatnce of desert vegetation in the condition of simulation drought could not exactly reveal tolerancedrought capability of their seed germination in the nature. And the adaptability of desert vegetations to drought not only depends on capability of drought-resistance, but also their drought-resistance mechanism. On the results and four vegetation habitats, the paper brought forward suggestions as follows: the capability and mechanism of drought - resistances of seed germination and seedling and transplant survival rates of species distributed in desert region should been studied together. Among the four vegetation, Kalidiumfoliatum is more suited to restore heavy salinization areas, and Artemisia arenaria is more fitted to restore serious sandy areas.关键词
荒漠植物/干旱胁迫/种子萌发/抗旱性评价Key words
desert vegetation/ drought stress/ seed germination/ drought resistance evaluation分类
农业科技引用本文复制引用
何芳兰,赵明,王继和,尉秋实,张锦春..几种荒漠植物种子萌发对干旱胁迫的响应及其抗旱性评价研究[J].干旱区地理,2011,34(1):100-106,7.基金项目
国家"十一五"科技支撑计划项目(2007BAD46B00) （2007BAD46B00）
甘肃省重大科技专项(0702NKDH030 （）
中央级公益性科研院所基本科研业务专项资金项目(CAFYBB2007043) （CAFYBB2007043）
