【摘要】 通过盆栽试验测定了土壤自然干旱胁迫过程中柽柳、梭梭和四翅滨藜3种灌木叶片相对含水量、水分饱和亏、超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、过氧化物酶(POD)活性和脯氨酸含量的变化,研究了3种植物对水分胁迫逆境环境的生理适应机理。结果表明:随土壤水分胁迫的加重,3种灌木叶片相对含水量下降,水分饱和亏增加,渗透调节物质脯氨酸积累,保护酶系统酶活性上升,但在变化趋势和幅度上有显著差异。3种灌木幼苗均有较强的耐旱性,但耐旱机制不同。更多还原

【Abstract】 The physiological adaptability mechanism of Tamarix chinensis seedlings,Haloxylon ammodendron seedlings and Atriplex canescens(pursh)Nutt seedlings under drought stress were studied.The changes of relative water content,water deficit,activity of superoxide dismutase(SOD),catalase(CAT),peroxidase(POD) and the contents of soluble protein in plant were measured.Results showed that with the increase of drought stress intensity,RWC of these three bushes decreased,and the water deficits increased.The activity of protective enzyme system increased,but there were significant differences in the tendency and extent.Meanwhile the proline as osmoregulation matters was accumulated.These three species of bush all had powerful ability in adapting to drought stress,but they had different drought resistance mechanism.更多还原