【作者】 魏磊；

【导师】 崔世茂；

【作者基本信息】 内蒙古农业大学 ， 果树学， 2008， 硕士

【摘要】 以盆栽山杏为试材,探讨了不同程度干旱胁迫对山杏叶片生理特性的影响。结果表明,山杏叶片净光合速率、蒸腾速率、气孔导度随着干旱胁迫程度的加强而降低。随着温度的升高,干旱胁迫程度的增强,叶片净光合速率和水分利用效率却随之降低,而蒸腾速率则随之升高,加重了干旱对其光合作用的影响。叶片蒸腾速率的日变化在各干旱胁迫处理间峰值的高低和峰出现的时间随着干旱胁迫程度的加强而降低和提前。在轻度和中度干旱胁迫下的净光合速率、气孔导度及水分利用效率日变化曲线与对照相同均呈双峰型,而在重度胁迫下净光合速率和气孔导度日变化则呈现单峰型。干旱胁迫使叶片可溶性糖含量和脯氨酸含量增加,SOD活性增强,其变化幅度为:重度胁迫>中度胁迫>轻度胁迫,而且重度胁迫还可能导致膜受损并很难恢复。山杏叶片脯氨酸含量在胁迫初期迅猛增加,随着干旱胁迫时间的延长.脯氨酸含量先增后减,说明在一定的干旱条件下,山杏对干旱胁迫具有一定的适应能力。更多还原

【Abstract】 In this research , The response of photosynthetic character of prunus sibirica to soil drought stress were studied .The results show that net photosynthetic rate (Pn), transpiration rate (Tr) and stomatal conductance(Cs)decreased with the increases in drought stress . Compared with control(Ck), Decreases of intercellular CO2 concentration (Ci) under mild and moderate stress and increase under severe stress were found .The test of respone of photosynthesis to temperature exhibited the decline of Pn and increase of Tr under higher temperature , and water use efficiency (WUE)decreased .The stress effects of drought were aggravated under higher temperature on photosynthesis . The peak values of the diurnal variation of Tr decreased and the time of the peak moved up with the increases in drought stress.The diurnal variation curves of Pn , Cs and WUE were double-peak types under different water stress , but the curves of Pn and Cs were changed to single-peak types under severe stress .Soluble sugar content ,proline (pro) content and SOD activitiesincreased,increased order was sever>moderate>milddrought stress .Proline (pro) content increased drastically during the early period, decreased after increased .The conclusion is that Prunus sibiricaexhibits a certain adaptability to drought stess更多还原