中国生态农业学报2011，Vol.19Issue(4)：872-877,6.DOI:10.3724/SP.J.1011.2011.00872
苦豆子和披针叶黄华种子萌发和幼苗生长对干旱胁迫的响应
Response of Sophora alopecuroides and Thermopsis lanceolata seed germination and growth to drought stress
摘要
Abstract
Seed germination and seedling stages are nol only crucial stages of the life span of plants, but also important adaptation stages to different environmental conditions. The response of Sophora ahpecuroides L. And Thermopsis lanceolate L, seed germination and seedling growth to drought stress in border desert lands of the Hexi Corridor were investigated under simulated drought conditions of polyethylene glycol-6000 (PEG) with -0.03 Mpa, -0.10 Mpa, -0.24 Mpa, -0.42 Mpa, -0.65 Mpa and -0.94 Mpa osmotic potentials. The main objectives of the study were to reveal the adaptive mechanisms of desert plants and to provide further technical guidance on seedling cultivation and restoration of desert vegetation. The result showed that the rate of seed water uptake, germination percentage, germination index, vigor index, seedling height, root length and plant water content decreased with increasing PEG drought stress. However, seedling and root dry weight and root/shoot ratio initially increased followed by a decrease. Furthermore, seed germination was sensitive to drought stress. The lowest osmotic potential threshold was -0.65 Mpa for S. Ahpecuroides seeds and -0.42 Mpa for T. Lanceolate seeds. For seeds incapable of germination under drought stress, germination percentage was high once water was recovered. The results suggested that response of seed germination and seedling growth to drought stress was ecologically essential for later establishment of seedlings and vegetation. In artificial cultivation, however, a key step for successful planting was guaranteed soil moisture.关键词
干旱胁迫/苦豆子/披针叶黄华/萌发率/吸水率Key words
Drought stress/ Sophora alopecuroides L./ Thermopsis tanceo/ata L./ Germination percentage. Seed water uptake分类
农业科学引用本文复制引用
王进,王桔红,张勇,马昭远,颜霞..苦豆子和披针叶黄华种子萌发和幼苗生长对干旱胁迫的响应[J].中国生态农业学报,2011,19(4):872-877,6.基金项目
国家自然科学基金项目(31040009)、甘肃省自然科学基金项目(1010RJZG204)、甘肃省高校河西走廊特色资源利用省级重点实验室基金(XZ1013)和河西学院校长基金项目(XZ201001)资助 （31040009）
