烯效唑对黑麦草抗旱生理特性的影响

Effects of uniconazole on the drought resistance of Perennial ryegrass

以黑麦草Lolium perenne为材料,研究了不同质量浓度烯效唑对黑麦草抗旱生理的影响。结果表明:在进行干旱胁迫前,叶面喷施烯效唑,能够在黑麦草受到干旱胁迫时不同程度的提高黑麦草的抗旱性。当土壤含水量降至14%时,未喷施烯效唑的黑麦草叶片严重萎蔫,而喷施一定质量浓度烯效唑的叶片叶色正常,且其叶绿素含量均有不同程度提高,叶片含水量提高、水势降低,游离脯氨酸含量增加、根冠比提高,其中以质量浓度为40 mg/L的效果最好。当烯效唑质量浓度增至80 mg/L时,过度抑制了地下部分的生长,减少了根吸收水分的范围和深度,反而降低黑麦草的抗旱性。因此,在黑麦草生长时期叶片喷施40 mg/L的烯效唑,可以提高黑麦草在干旱条件下的抗旱性,对草坪节水灌溉有重要意义。

The effects of uniconazole （S3307） on the drought resistance of Perennial ryegrass were investigated by pot experiment under different concentration treatments of SS3307（0-80 mg/L）. Pe-rennial ryegrass was subjected to soil drought stress by withholding watering at the fifteen days after spraying SS3307. The results showed that S3307 increased the relative water content of Perennial ryegrass and therefore increased the drought resistance. When the soil water content decreased to 14%, the leaves of non-spraying control withered greatly, however, the leaves in uniconazole treatment had normal leaf color, the contents of chlorophyll, the leaf water content and free-proline, and also the ratio of the root to crown of Perennial ryegrass were significantly increased, the treatment with 40 mg/L concentration were better than others. When the concentration increased to 80 mg/L, it restrained the growth of underground part, and decreased the range and depth of imbibing ability,then reduced the resistance of the Perennial ryegrass. This suggested that spraying 40 mg/L unicon-azole could effectively increase the drought resistance of the Perennial ryegrass.