干旱胁迫对水稻叶表面蜡质积累的影响

Impact of Water Stress on Leaf Epicuticular Wax Accumulation of Rice

环境胁迫一直以来是影响植物生长和农作物产量的主要因素,而覆盖植物叶片表层的蜡质层在植物生长发育和适应外界环境方面起着关键作用。本试验以中花11、广盐2号和Z46这3个水稻品种进行干旱胁迫处理,通过扫描电镜观察叶片表面蜡质覆盖密度,以及测定叶片相对含水量、叶绿素浸提率以及失水率等生理指标,从而综合分析干旱胁迫对不同水稻品种叶片表面蜡质积累的影响。结果表明:干旱胁迫条件下,3个试验的水稻品种叶片相对含水量降低,叶表面蜡质覆盖量增加,叶绿素浸提率以及离体叶片失水率下降。

Environmental stresses are the main factors which affect plant growth and crop yield. Wax layer which covers the plant surface plays a key role in plant growth and development, and adapting to the external environment. In this study, three rice varieties such as ＂Zhonghua 11 ＂, ＂Euryhaline 2＂ and ＂Z46＂ were treated by drought, then the leaf surface wax coverage was observed by scanning electron microscope （SEM）, and the relative water content, chlorophyll extraction rate and water-loss rate were determined so as to analyze synthetically the effect of water stress on the leaf epicuticular wax coverage. The results showed that the leaf relative water content of three tested rice varieties decreased, the leaf epicuticular wax crystals increased, and the chlorophyll leaching and water loss rate decreased under drought resistance.