摘要
在实验室内模拟研究的基础上,运用生理生态学的原理,研究了水盐胁迫对钠猪毛菜(salsola nitraria)和散枝猪毛菜(salsola brachiata)种子萌发的影响,结果显示,钠猪毛菜与散枝猪毛菜种子萌发的最适温度分别为25℃和15℃。在盐溶液和PEG溶液中,2种种子的萌发规律相似,即随着水势的降低,萌发率和萌发速率下降。在盐胁迫下钠猪毛菜和散枝猪毛菜种子萌发的最低水势接近-7.2 MPa;在水分胁迫下2种种子萌发的最低水势均未超过-2.0MPa,其中,钠猪毛菜种子表现出较强的耐水分胁迫能力。在相同水势条件下,PEG对2种猪毛菜种子萌发的抑制程度显著大于等渗NaCl,说明渗透胁迫是影响2种植物种子萌发的主要因素。
The paper integrated the effect of water and salt stress on the seed germination of two halophytes： Salsola nitraria and salsola brachiataby simulation experiments in growth chamber. The results were as following： the optimal constant temperatures for Salsola nitraria and salsola brachiataby were 25℃ and 15℃. The germinated regularity of two species of Salsola L. was similar in saline and PEG solutions： the germination percentage and germination rate of both species decreased with decreasing water potential in all types of solutions. The germination lowest water potential of Salsola nitraria and salsola brachiataby approached - 7.2 MPa on salinity stress; the germination lowest water potential of Salsola nitraria and salsola brachiataby were not exceed - 2.0 MPa on water stress, and Salsola nitraria represented terriblestrong tolerance to water stress. In the same water potential, the inhibitory effects of PEG were greater than those of iso-osmotic NaCl. It displayed that the osmotic stress is the main factor that affects germination of halophyte.
出处
《干旱环境监测》
2007年第4期229-234,共6页
Arid Environmental Monitoring
基金
中国科学院"西部之光"人才培养计划项目(2005)
中国科学院新疆生态与地理研究所"绿洲学者"项目(0671051)
