文献类型： 外文期刊
作者： Huang, Mingchao 1 ; Yuan, Mengru 1 ; Sun, Chunyu 1 ; Li, Meiru 1 ; Wu, Pingzhi 4 ; Jiang, Huawu 1 ; Wu, Guojiang 1 ; Chen, Yaping 1 ;
作者机构： 1.Chinese Acad Sci, South China Bot Garden, Key Lab South China Agr Plant Mol Anal & Genet Im, Guangzhou 510650, Peoples R China
2.Chinese Acad Sci, South China Bot Garden, Guangdong Prov Key Lab Appl Bot, Guangzhou 510650, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Guangdong Acad Agr Sci, Key Lab South Subtrop Fruit Biol & Genet Resource, Key Lab Trop & Subtrop Fruit Tree Res Guangdong P, Minist Agr,Inst Fruit Tree Res, Guangzhou 510640, Peoples R China
关键词： Lotus japonicus; development; nodulation; disease resistance
期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：6.208； 五年影响因子：6.628 ）
ISSN：
年卷期： 2022 年 23 卷 12 期
页码：
收录情况： SCI
摘要： Arabidopsis AGD2 (Aberrant Growth and Death2) and its close homolog ALD1 (AGD2-like defense response protein 1) have divergent roles in plant defense. We previously reported that modulation of salicylic acid (SA) contents by ALD1 affects numbers of nodules produced by Lotus japonicus, but AGD2 ' s role in leguminous plants remains unclear. A combination of enzymatic analysis and biological characterization of genetic materials was used to study the function of AGD2 (LjAGD2a and LjAGD2b) in L. japonicus. Both LjAGD2a and LjAGD2b could complement dapD and dapE mutants of Escherichia coli and had aminotransferase activity in vitro. ljagd2 plants, with insertional mutations of LjAGD2, had delayed flowering times and reduced seed weights. In contrast, overexpression of LjAGD2a in L. japonicus induced early flowering, with increases in seed and flower sizes, but reductions in pollen fertility and seed setting rates. Additionally, ljagd2a mutation resulted in increased expression of nodulin genes and corresponding increases in infection threads and nodule numbers following inoculation with Rhizobium. Changes in expression of LjAGD2a in L. japonicus also affected endogenous SA contents and hence resistance to pathogens. Our results indicate that LjAGD2a functions as an LL-DAP aminotransferase and plays important roles in plant development. Moreover, LjAGD2a activates defense signaling via the Lys synthesis pathway, thereby participating in legume-microbe interaction.
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