丛枝菌丝网络介导苜蓿植株间机械损伤信号的传递

Defense Signal Transmission between Alfalfa Plants through Underground Mycorrhizal Network

摘要:

为了解植株间的菌丝网络（common mycorrhizal networks，CMNs）的功能，对丛枝菌根菌丝网络在紫花苜蓿（Medicago sativa）机械损伤信号传递中的作用进行了研究。结果表明，与经机械损伤处理的供体植株有CMNs连接的受体植株叶片中挥发物的数量和种类都显著高于无CMNs连接的植株；供体植株经机械损伤处理后，有CMNs连接的受体植株的超氧化物歧化酶（SOD）等抗逆酶活性都显著升高。这表明机械损伤诱导的防御信号可通过地下菌丝网络传递给邻近植株，激活邻近植株防御系统，使邻近未受机械损伤的苜蓿植株改变挥发性气体，并改变其防御酶活性，用以修复损伤带来的伤害。

Abstract:

In order to understand the function of common mycorrhizal networks (CMNs) among plants, its role in mechanical damage signal transduction of Medicago sativa was studied. The results showed that analyzed whether the damage signal of donor plants could be transmitted to the neighboring recipient plants through CMNs. The number and kinds of volatile compounds in leaves of recipient plants connected with CMNs were significantly higher than those connected without CMNs. The activities of defense enzyme also increased significantly in recipient plants connected with CMNs. Therefore, it was suggested that the defense signals induced by mechanical damage could be transmitted to neighboring plants through CMNs, which activates the defense system of neighboring plants, so that the nearby alfalfa plants without mechanical damage changed the volatile gas and the defense enzyme activity, so as to repair the damage caused by the damage.