摘要
两个小麦品种叶片延伸速率随着土壤水分胁迫的加剧而下降,复水后“昌乐5号”恢复生长比“鲁麦5号”快。随着水势的下降,两个品种叶片渗透调节能力增加,“昌乐5号”约为0.41MPa;“鲁麦5号”约为0.33MPa。在同一叶片延伸速率下,“昌乐5号”的水势、渗透势总是比“鲁麦5号”的更低,生长停止时前者的水势、渗透势分别为-1.50MPa、-1.70MPa左右;而后者则分别为-1.20MPa和-1.30MPa左右。叶片细胞延伸生长的临界膨压不同,“昌乐5号”为0.22 MPa,“鲁麦5号”为0.15MPa,扩张系数变化很小。
The results of the experiment showed that leaf elongation rate in two wheat cultivars de- creased under soil water stress. Rewatering after water stress, growth restoration of 'Changle No.5' was faster than that of ',Lumai No.5'. The osmotic adjustment ability of leaves in these two wheat cultivars increased to 0.41MPa for 'Changle No.5' and 0.33MPa for 'Lumai No.5' as water potential decreased. Ar the same leaf elongation rate water porential and osmo- tic potential of 'Changle No.5' decreased more than that of 'Lumai No.5.' Leaf elongation rate fell to zero as water potential and osmotic potential were --1.50MPa and --1.70MPa for 'Changle No.5' and --1.20MPa and --1.30MPa for 'Lumai No.5.' The threshold turgor pres- sure of elongation growth in leaf cell was different being 0.22MPa for 'Changle No.5' and 0.15MPa for 'Lumai No.5'. The difference in the gross extensible coefficient of growing leaf was very small.
关键词
小麦
土壤水分胁迫
渗透调节
Wheat
Soil water stress
Osmotic adjustment
Leaf elongation rate
