论文部分内容阅读
以喜马拉雅紫茉莉1年生成年苗为试材,采用盆栽试验和自然干燥的方法,研究了喜马拉雅紫茉莉对土壤干旱胁迫的生理生态响应过程。结果表明:随着干旱程度的加剧,喜马拉雅紫茉莉叶片相对含水量(LRWC)及叶绿素(Chl)含量在中轻度干旱胁迫下变化幅度不大,在土壤含水量为8.88%~9.58%(28d)时,开始发生显著变化;脯氨酸和可溶性糖的含量随土壤相对含水量降低而增加;喜马拉雅紫茉莉通过SOD和POD的协同作用以清除体内氧自由基,达到适应和抵御干旱逆境的目的,并且POD活性作用大于SOD活性作用。喜马拉雅紫茉莉可通过渗透调节、抗氧化酶活性升高等途径增强对干旱环境的耐受性和适应性;喜马拉雅紫茉莉有较强的抗旱性,干旱胁迫28d(土壤含水量10%左右)为耐受极限。
Taking one-year old seedlings of Mirabilis jalapa in Himalayas as test material, the physiological and ecological responses of Mirabilis jalapa to soil drought stress were studied by means of pot experiment and natural drying method. The results showed that the leaf water content (LRWC) and chlorophyll (Chl) content of the leaves of the Himalaya jamesonii under moderate and moderate drought stress did not change much with the increasing degree of drought. Under the condition of soil water content of 8.88% ~ 9.58% ), The content of proline and soluble sugar increased with the decrease of soil relative water content. The synergistic effect of SOD and POD in the body of the genus Himalaya to eliminate oxygen free radicals and achieve the purpose of adapting and resisting the drought stress , And POD activity is greater than that of SOD activity. Mirabilis jalapa increased its tolerance and adaptability to arid environment by osmotic adjustment and antioxidant enzyme activity enhancement. Mirabilis jalapa had stronger drought resistance, drought resistance 28 d (soil moisture content about 10%) was resistant By the limit.