氮和磷对不同基因型小麦水分状况的影响

为了阐明不同水分条件下氮、磷对不同基因型小麦的水分生理指标的作用及其变化趋势，试验逸用6个不同基因型的小麦进化材料，研究了拔节期各基因型小麦的叶片保水力、叶水势、叶片膜透性与气孔导度。结果表明，当土壤水分充足时，施肥会提高叶片保水力、叶水势，降低叶片膜透性，增加二倍体小走的气孔导度，而降低六倍体小走的气孔导度。在水分胁迫下，施肥会提高叶片保水力，降低叶水势、叶片膜透性和气孔导度；而且随小麦染色体倍性从2n→4n→6n的进化方向，小麦叶片保水力、叶水势、叶片膜透性均先降低，然后又升高。

Effects of Nitrogen and Phosphorus on Leaf Water Status of Different Wheat Genotypes

The leaf water retention capability, water potential, membrane permeability and stomatal conductance of six wheat genotypes, which are very important in the evolution of wheat, were investigated to study the effects of nitrogen and phosphorus on wheat water physiological indexes under different soil water condition. The results showed that under sufficient soil water condition, the application of nitrogen and phosphorus elevated leaf water retention capability and water potential, decreased membrane permeability, increased the stomatal conductance of diploid, but decreased the stomatal conductance of hexaploid. Under water stress, increasing fertilizer improved leaf water retention capability, but decreased leaf water potential, membrane permeability and stomatal conductance. And with the evolution from diploid to tetraploid to hexaploid, leaf water retention capability, water potential and membrane permeability decreased first, then increased.