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以豫麦49为研究材料,在水分胁迫条件下研究钙赤合剂(Ca-GA)和磷(P)浸种对幼苗净光合速率(Pn)、水分利用效率(WUE)、渗透调节物质脯氨酸(Pro)、膜脂过氧化物丙二醛(MDA)及抗氧化酶系统的影响。结果表明:与清水浸种处理相比,Ca-GA浸种和P浸种处理后的幼苗在重度水分胁迫条件下其光合速率和水分利用效率增加,MDA含量降低,Pro含量增加,过氧化物酶(POD)、超氧化物歧化酶(SOD)及过氧化氢酶(CAT)活性增强,抗坏血酸-过氧化物酶(APX)活性变化不大,抗坏血酸(AsA)和还原型谷胱甘肽(GSH)含量升高。以上结果表明:Ca-GA浸种和P浸种处理均有效降低了水分胁迫导致的抗氧化系统紊乱,使幼苗保持一定的光合速率和较高的水分利用效率。总体上看,Ca-GA浸种和P浸种可有效提高小麦幼苗抗旱性。
Yumai49 was used to study the effects of Ca-GA and P treatments on the net photosynthetic rate (Pn), water use efficiency (WUE), osmoregulation proline (Pro), membrane lipid peroxide malondialdehyde (MDA) and antioxidant enzyme system. The results showed that the photosynthetic rate and water use efficiency of seedlings treated with Ca-GA soaking and P soaking were significantly increased, the content of MDA decreased, the content of Pro increased, the content of peroxidase (POD) ), Superoxide dismutase (SOD) and catalase (CAT) activities were increased, activity of ascorbate peroxidase (APX) changed little, ascorbate and glutathione (GSH) Rise. The above results show that Ca-GA soaking and P soaking treatment can effectively reduce the disturbance of antioxidant system caused by water stress and maintain the photosynthetic rate and water use efficiency of seedlings. Overall, Ca-GA soaking and P soaking can effectively improve the drought resistance of wheat seedlings.