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干旱协迫下，抗旱（陕合６号）与干旱敏感（郑引１号）小麦品种叶片中的核糖核酸酶活性均有所增加，增加幅度与其相对含水量变化呈显著负相关。１４Ｃ－Ｌｅｕ掺入后，样品粗提液经ＰＡＧＥ分离并染色，发现干旱处理叶片的两个低分子女（１２ｋＤ、１７ｋＤ）具ＲＮａｓｅ活性的蛋白质的放射性掺入总量低于对照，但占总蛋白的放射性比例高子对照，证明干旱胁迫下存在ＲＮａｓｅ的从头合成（ｄｅｎｏｖｏｓｙｎｔｈｓｉｓ）。讨论了胁迫下ＲＮａｓｅ活性增加的原因。
Under drought co-operation, the activities of ribonucleases in drought-resistant wheat (Shaanhe 6) and drought-sensitive (Zhengyin 1) increased with the relative water content. After 14C-Leu incorporation, the crude extracts were separated by PAGE and stained. The results showed that the total radioactive incorporation of RNase activity of two low-molecular-weight female (12kD, 17kD) The radioactive high-sub-control of the protein demonstrated the denovosynthsis of RNase under drought stress. The reason for the increase of RNase activity under stress was discussed.