几种旱生灌木种子萌发对干旱胁迫的响应

应用生态学报 ›› 2002, Vol. ›› Issue (8): 953-956.

几种旱生灌木种子萌发对干旱胁迫的响应

曾彦军¹, 王彦荣¹, 萨仁², 田雪梅²

1. 兰州大学草地农业科技学院, 甘肃草原生态研究所, 兰州 730020;
2. 内蒙古阿拉善盟草原站, 巴彦浩特 750360

收稿日期:2002-04-07 修回日期:2002-05-09 出版日期:2002-08-15
通讯作者: 曾彦军,男,1964年生,助理研究员,主要从事草原生态学和种子学研究,发表论文15篇.E-mail:yrwang66@public.lz.gs.cn
基金资助:
国家重点基础研究发展规划项目(G2000048704)

Response of seed germination of three xeromorphic shrubs to drought stress

ZENG Yanjun¹, WANG Yanrong¹, SA Ren², TIAN Xuemei ²

1. College of Pastoral Agriculture Science and Technology, Lanzhou University, Gansu Grassland Ecological Research Institute, Lanzhou 730020;
2. Grassland Station of Alashan Region, Inner Mongolia, Bayanhot 750360

Received:2002-04-07 Revised:2002-05-09 Online:2002-08-15

摘要/Abstract

摘要： 以不同渗透势的PEG(6000)溶液(-0.3～-2.7MPa)为模拟干旱胁迫条件,研究了柠条(Caragana korshinskii)、花棒(Hedysarum scoparium)和白沙蒿(Artemisia sphaerocephala)种子发芽、幼苗生长和累积吸水率对干旱胁迫的响应,讨论了参试种子发芽特性、初生根长度与幼苗建植成活率的关系.结果表明,干旱胁迫下柠条发芽率最高,其次为花棒,白沙蒿最低.-0.3～-0.6MPa渗透势下白沙蒿发芽10d的初生根长度显著大于花棒和柠条(P<0.05),三者的测量值依次为7.9、4.5和3.1cm.干旱胁迫条件下参试种子发芽率与种子72h累积吸水率均呈极显著的正相关(P<0.01).

Abstract: The seed germination, seedling growth and water absorption characteristic of Caragana korshinskii, Hedysarum scoparium, and Artemisia sphearocephala were investigated under different osmotic potentials (PEG 6000, -0.3～-2.7MPa). The results showed that under drought stress, C.korshinskii had the highest germination rate, while A.sphearocephala had the lowest one.Under -0.3～-0.6MPa, the root length of 10 day old A.sphearocephala seedling was significantly longer than that of H. scoparium and Caragana korshinskii (P<0.05),and the length reached 7.9, 4.5 and 3.1cm, respectively. There existed a significant positive correlation between seed germination rate and 72h water absorption rate of the three shrub seeds(P<0.01). The relationships among germination characteristics, root length, and survive percentage of seedlings were also discussed.

中图分类号:

S793.01

曾彦军, 王彦荣, 萨仁, 田雪梅. 几种旱生灌木种子萌发对干旱胁迫的响应[J]. 应用生态学报, 2002, (8): 953-956.

ZENG Yanjun, WANG Yanrong, SA Ren, TIAN Xuemei . Response of seed germination of three xeromorphic shrubs to drought stress[J]. Chinese Journal of Applied Ecology, 2002, (8): 953-956.

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