长柄扁桃在乌兰布和沙地的生理适应性研究

Physiological Adaptability of Amygdalus pedunculata to Wulanbuhe Sandy Land

本试验分析了人工模拟干旱条件下长柄扁桃几个生理指标的变化,并探讨了长柄扁桃对干旱环境的适应性。研究结果表明:长柄扁桃叶片丙二醛(MDA)含量随着干旱程度的加剧而增加,且随着干旱时长的延长呈上升趋势;超氧化物歧化酶(SOD)活性随着干旱程度的增加而提升,但在中度干旱和极度干旱时,当干旱时长达到21 d后,则出现小幅回落;过氧化物酶(POD)活性在中度干旱以内随干旱程度增加而提升,但到了极度干旱时,POD活性反而低于中度干旱的POD水平;脯氨酸含量整体上都呈现出先升后降的趋势,在胁迫21 d时Pro含量出现了一个高峰,但在持续干旱28 d后都呈下降趋势。结论是长柄扁桃具有典型抗旱植物的生理特征,对干旱具有一定的适应能力,但在生产中必须重视长柄扁桃抗旱的生理极限,应及时补充水分以保障其正常生长发育。

The changes of several physiological indexes of almond under artificial simulated drought conditions were studied and the adaptability of Amygdalus pedunculata to drought environment was discussed.The results showed that the content of malondialdehyde(MDA)increased with the aggravation of drought,and increased with the extension of drought time.The activity of superoxide dismutase(SOD)increased with the increase of drought severity,but decreased slightly after 21 days in moderate drought and extreme drought.Peroxidase(POD)activity increased with the increase of drought severity within moderate drought,but in extreme drought,POD activity was lower than that of moderate drought.On the whole,the content of proline increased first and then decreased.The Pro content appeared a peak at 21 days of stress,but decreased after 28 days of continuous drought.The conclusion is that Amygdalus pedunculata has the physiological characteristics of typical drought resistant plants and has developed certain adaptability to drought,but attention should be paid to the physiological limit of drought resistance in production,and supplement water in time need to be available to ensure its normal growth and development.