TAA family contributes to auxin production during de novo regeneration of adventitious roots from Arabidopsis leaf explants
TAA family contributes to auxin production during de novo regeneration of adventitious roots from Arabidopsis leaf explants
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TAA家族在拟南芥叶外植体不定根从头再生过程中有助于生长素的产生
DOI：
10.1007/s11434-016-1185-9
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发表时间：
2016-10
期刊：
影响因子：
18.9
通讯作者：
Lin Xu
中科院分区：
文献类型：
--
作者：
Xuening Zhang;Zhongnan Yang;Wu Liu;Lin Xu
Abstract
Many differentiated plant organs have the ability to regenerate into a new plant after detachment via de novo organogenesis. During de novo root organogenesis from Arabidopsis thaliana leaf explants, wounding first induces endogenous auxin production in mesophyll cells. Auxin is then polar transported to, and accumulates in, regeneration-competent cells near the wound to trigger the cell-fate transition. The TRYPTOPHAN AMINOTRANSFERASE OF ARABIDOPSIS (TAA) family proteins and the YUCCA (YUC) family proteins catalyze two successive biochemical steps in auxin biogenesis, and YUCs have been shown to be involved in auxin production in mesophyll cells during de novo root organogenesis. In this study, we show that the TAA family is also required for adventitious rooting. Inhibition of TAA blocked adventitious root formation from leaf explants. Intriguingly, whereas YUC1 and YUC4 have been shown to be highly induced by wounding, TAA genes retained consistent expression levels before and after leaf detachment. Therefore, we suggest that TAAs and YUCs are both required for auxin biogenesis in leaf explants, but they play different roles in regeneration. While YUC1 and YUC4 function in response to wounding to catalyze the rate-limiting step in auxin biosynthesis, TAAs probably serve as abiding and basal enzymes during de novo root organogenesis from leaf explants.
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影响因子：
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作者：
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DOI：
10.1073/pnas.1108436108
发表时间：
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影响因子：
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