腐殖酸对小麦抗旱性的生理效应

Physiological effects of humic acids on drought resistance of wheat

在干旱气候条件下，喷施腐殖酸钠（ＨＡ）、黄腐酸钠（ＦＡ）可降低土壤水分损耗，提高小麦叶片持水能力，叶片细胞超氧物歧化酶（ＳＯＤ）、过氧化氢酶（ＣＡＴ）活性明显提高，丙二醛（ＭＤＡ）含量和电解质渗出率明显降低，可减缓叶绿素降解，增强光合速率和光合产物积累，延缓植株衰老，小麦抗旱性增强，千粒重增加．

Under dry climate condition, spraying humic acids can decrease the loss of soil moisture and enhance the water retention ability of wheat leaf. The activities of superoxide dismutase (SOD) and catalase (CAT) in leaf cells are significantly increased, but the MDA content and leakage rate of electrolyte are significantly'decreased, and hence, the chlorophyll decomposition is retarded, the photosynthetic rate and grain filling intensity are increased. the plant senescence is retarded, the drought resistance of wheat is enhanced and its thousand-grain weight is increased.