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[目的]研究小桐子幼苗在空气干旱胁迫下的水分状况变化与渗透调节物质响应差异,以更好地理解其抗旱性机制。[方法]以培养12d的小桐子幼苗为材料,在25℃/20℃(昼/夜)、16h光照、相对湿度75%的人工气候箱中进行空气干旱处理,测定小桐子水势、渗透势,以及可溶性糖、脯氨酸、甜菜碱含量变化。[结果]空气干旱处理导致小桐子叶片水势、渗透势显著下降,膨压丧失。小桐子叶片和茎秆中可溶性糖、脯氨酸和甜菜碱含量不同程度地显著上升。[结论]小桐子叶和茎中有机渗透调节物质对干旱胁迫的响应存在明显差异,总体而言,叶片对干旱的响应大于茎秆。
[Objective] The research aimed to study the differences of water status and osmoregulation material responses of Jatropha curcas seedlings under air-drought stress in order to better understand the mechanism of drought resistance. [Method] With air-dry treatment of Jatropha curcas seedlings for 12 days in the artificial climate chamber at 25 ℃ / 20 ℃ (day / night), 16h illumination and relative humidity 75%, the water potential, As well as soluble sugar, proline, betaine content changes. [Result] The air drought treatment caused the water potential and the osmotic potential of Jatropha curcas decreased significantly and the turgor loss. The contents of soluble sugar, proline and betaine in leaves and stems of Jatropha curcas rose significantly to varying degrees. [Conclusion] The response of organic osmotic adjusting substances in leaves and stems of Jatropha curcas to drought stress were significantly different. Generally, the response of leaves to drought was greater than that of stems.