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The AMT1 family genes from Malus robusta display differential transcription features and ammonium transport abilities

文献类型： 外文期刊

作者： Li, Hui 1 ; Yang, Qing-song 1 ; Liu, Wei 1 ; Lin, Jing 1 ; Chang, You-hong 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Hort, Jiangsu Key Lab Hort Crop Genet Improvement, Nanjing, Jiangsu, Peoples R China

关键词： Ammonium transport;Malus robusta;Expression profile;Yeast complementation

期刊名称：MOLECULAR BIOLOGY REPORTS （ 影响因子：2.316； 五年影响因子：2.357 ）

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收录情况： SCI

摘要： Ammonium is an important nitrogen sources for plant growth. In this study, we report on the gene characterization of the ammonium transporter AMT1 subfamily in the apple rootstock Malus robusta Rehd. Thirteen AMT genes were comprehensively evaluated from the apple genome (version 1.0). Then the gene features and expression patterns of five AMT1 members from M. robusta were analyzed. These genes fell into four clusters in the AMT phylogenetic tree: clade I (MrAMT1;1 and MrAMT1;3), clade II (MrAMT1;4), clade III (MrAMT1;2), and clade IV (MrAMT1;5). All the AMT1s, apart from MrAMT1;4, were expressed in vegetative organs and strongly responded to nitrogen concentration changes. For example, MrAMT1;2 and MrAMT1;3 had high transcript accumulation levels in the leaves and roots, respectively. Finally, the functions of these AMT1s were studied in detail by heterologous expression in yeast. These genes allowed strain 31019b to assimilate nitrogen, but their (NH4)-N-15 (+) uptake kinetics varied. These results revealed the functional roles of AMT1 during ammonium absorption in the AMT-defective mutant yeast system.

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