ALA对冬小麦叶片气体交换和水分利用效率的影响

以冬小麦“百农矮抗58”为材料，研究了在始穗期喷施不同浓度(10 、30、50 mg/L)的5-氨基乙酰丙酸（5-aminolevulinic acid, ALA)对冬小麦叶片气体交换和水分利用效率的影响。结果表明，10～50 mg/L ALA处理的叶片气孔导度高于不喷施的对照，但在开花期和乳熟期对气孔导度的促进作用大于腊熟期； 叶片净光合速率也明显高于对照。在开花期和乳熟期，ALA提高叶片的净光合速率主要是由于减少了光合的气孔限制； 而在腊熟期则主要是由于减少了光合的非气孔限制。在开花期和乳熟期，10～50 mg/L ALA处理的叶片水分利用效率与对照没有显著性差异，但在腊熟期，叶片水分利用效率较对照有显著性提高。与对照相比，10～50 mg/L ALA处理冬小麦的穗粒数、千粒重和产量显著增加，其中以30 mg/L ALA处理增产效果最大。

Effects of 5-aminolevulinic acid on leaf gas exchange and water use efficiency in winter wheat

Using Bainong AK58 as experiment material,a field experiment was conducted to examine the effects of different concentrations of 5-aminolevulinic acid(ALA)(10 mg/L,30 mg/L,50 mg/L) applied at initial heading stage on leaf gas exchange and water use efficiency of winter wheat.The results were as follows: The stomatal conductance of winter wheat flag leaves treated with 1050 mg/L ALA were significantly higher than that of the control(0 mg/L ALA);however the promotive effects of 10-50 mg/L ALA on stomatal cond...