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[目的]研究干旱胁迫对甘蔗叶片水分和叶绿素荧光参数的影响,为甘蔗生产及评价研究提供依据。[方法]选取7个抗旱性不同的甘蔗品种,在苗期进行干旱胁迫,并测定胁迫条件下甘蔗叶片水分含量和叶绿素荧光参数的变化。[结果]甘蔗叶片水势和相对含水量与土壤相对含水量存在一定的内在联系,耐旱强的品种对土壤水分的利用率较高;相关分析和因子分析表明苗期干旱存活率、Fv/Fm、叶片水势和相对含水量可被用作抗旱性评价指标。[结论]水势表现为一个相对独立的影响因子,对甘蔗抗旱性有支配作用,并验证了Fv/Fm作为甘蔗抗旱评价指标的可靠性。
[Objective] The research aimed to study the effects of drought stress on water content and chlorophyll fluorescence parameters of sugarcane leaves, and provide basis for sugarcane production and evaluation. [Method] Seven sugarcane varieties with different drought resistance were selected to conduct drought stress at seedling stage. The changes of water content and chlorophyll fluorescence parameters of sugarcane leaves under stress were measured. [Result] The water potential and relative water content of sugarcane leaves were related to the relative water content of sugarcane. The drought tolerant cultivars had a higher utilization rate of soil moisture. Correlation analysis and factor analysis showed that the survival rate of seedling Drought, Fv / Fm , Leaf water potential and relative water content can be used as drought resistance evaluation index. [Conclusion] The water potential was a relative independent factor, which had a dominant effect on the drought resistance of sugarcane, and verified the reliability of Fv / Fm as an index to assess the drought resistance of sugarcane.