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草业学报  2012 

钙磷对酸铝胁迫后紫花苜蓿-根瘤菌体系结瘤固氮的修复效应

, PP. 108-116

Keywords: 紫花苜蓿,群体感应,固氮性能,修复,钙磷交互

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Abstract:

本试验采用水培法,以三得利紫花苜蓿和耐酸苜蓿根瘤菌91522为材料,探讨了酸铝胁迫处理苜蓿幼苗1周后,施加Ca2+、P对紫花苜蓿-根瘤菌结瘤固氮性能和群体感应的修复/恢复作用。结果表明,酸铝毒害后,Ca2+对紫花苜蓿-根瘤菌结瘤过程有显著的修复效应,根瘤菌群体感应、根瘤固氮酶活性显著提高;4μmol/LP素营养与Ca2+存在交互效应,导致苜蓿现瘤时间较未经修复的处理提前14d,苜蓿结瘤总数提高了247.09%,结瘤率达到90%,根毛变形率由3.33%提高到28.89%。Ca2+对结瘤动力学曲线的修复作用主要表现为从开始结瘤起同期结瘤数显著提高。P素对结瘤数影响在Ca2+5mmol/L条件下较显著;Ca2+对固氮酶活性有显著提高作用,而且5mmol/L效果优于10mmol/L,4μmol/LP素可以进一步提高固氮酶活性。初步认为,补充Ca2+和4μmol/LP可以促进根瘤菌在酸铝胁迫条件下群体感应物的分泌、改善苜蓿根毛对结瘤信号的感知和变形,修复酸铝对苜蓿和根瘤菌的毒害,恢复和提高固氮性能。

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