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作者	单位
赵丽敏 ,姜钧升,张萍萍,李秧秧	（1. 西北农林科技大学资源环境学院，陕西杨凌 712100； 2. 西北农林科技大学水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室，陕西杨凌 712100）

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中文摘要:

为给小麦抗旱和高水分利用效率育种提供理论根据，选用陕西关中不同年代生产上主要推广种植的8个品种，研究了叶表皮导度的变异及其与叶片形态生理特性之间的关系。结果表明，小麦拔节期的叶表皮导度为21.2～30.8 mmol·m^-2·s^-1，灌浆期为11.9~23.2 mmol·m^-2·s^-1，灌浆期的叶表皮导度低于拔节期。抗旱品种长武134的叶表皮导度显著低于其他品种。拔节期8个品种的叶表皮导度并无显著差异，灌浆期则存在极显著差异。拔节期叶表皮导度与叶面积和叶下表面气孔宽度呈显著正相关，与蜡质含量呈显著负相关；灌浆期叶表皮导度与叶形态特性、蜡质含量和气孔特性无相关性。说明拔节期和灌浆期影响小麦叶表皮导度变异的机制不同。

英文摘要:

Leaf epidermal conductance is closely related with dehydration tolerance and water use efficiency in crops, thus it has important value in drought resistant breeding. Eight wheat cultivars which were widely planted in the last 50 years in Guanzhong area of Shaanxi province were used to test the degree of genotypic variation in epidermal conductance and its correlation with some morpho physiological characters of leaf. The results indicated that the epidermal conductance of the eight wheat cultivars were ranged between 21.2～30.8 mmol·m^-2·s^-1 at booting stage，11.9～23.2 mmol·m^-2·s^-1 at grain filling stage, respectively. Leaf epidermal conductance at grain filling stage was lower than that at booting stage. Drought resistant cultivar Changwu 134 had lower epidermal conductance than other cultivars. No significant difference in epidermal conductance was detected at booting stage, but extremely significant difference observed at grain filling stage. Leaf epidermal conductance of wheat was positively related with leaf area and abaxial stomata width, and negatively related with wax load at booting stage.Epidermal conductance of wheat leaf was not related with leaf morphological traits, wax load and stomatal traits at grain filling stage, indicating different mechanisms may involve in the variation of wheat leaf epidermal conductance at booting and grain filling stage.

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