Root Growth of Arabidopsis thaliana Is Regulated by Ethylene and Abscisic Acid Signaling Interaction in Response to HrpNEa, a Bacterial Protein of Harpin Group
Root Growth of Arabidopsis thaliana Is Regulated by Ethylene and Abscisic Acid Signaling Interaction in Response to HrpNEa, a Bacterial Protein of Harpin Group
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DOI：
10.1007/s11105-008-0038-3
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发表时间：
2008-05
影响因子：
2.1
通讯作者：
X. Ren;Fang Liu;Z. Bao;Chunling Zhang;Xiaojing Wu;Lei Chen;Ruoxue Liu;Hansong Dong
中科院分区：
文献类型：
--
作者：
X. Ren;Fang Liu;Z. Bao;Chunling Zhang;Xiaojing Wu;Lei Chen;Ruoxue Liu;Hansong Dong
HrpNEais a harpin protein fromErwinia amylovora, a bacterial pathogen that causes fire blight in rosaceous plants. Treating plants with HrpNEastimulates ethylene and abscisic acid (ABA) to induce plant growth and drought tolerance, respectively. Herein, we report that both growth hormones cooperate to mediate the role of HrpNEain promoting root growth ofArabidopsis thalianaseedlings. Root growth is promoted coordinately with elevation in levels of ABA and ethylene subsequent to soaking of germinating seeds of wild-type (WT)Arabidopsisin a solution of HrpNEa. However, these responses are arrested by inhibiting WT roots from synthesizing ethylene as well as sensing of ABA and ethylene. The effects of HrpNEaon roots are also nullified in ethylene-insensitiveetr1-1andein5-1mutants and in the ABA-insensitive mutantabi2-1ofArabidopsis. These results provide evidence for presence of a relationship between root growth enhancement and signaling by ABA and ethylene in response to HrpNEa. Nevertheless, when HrpNEais applied to leaves, ethylene signaling is active in the absence of ABA signaling to promote plant growth. This suggests the presence of a different signaling mechanism in leaves from that in roots.
