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标题：PILS6 is a temperature-sensitive regulator of nuclear auxin input and organ growth in Arabidopsis thaliana
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作者：Elena Feraru ; Mugurel I. Feraru ; Elke Barbez 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2019
卷号：116
期号：9
页码：3893-3898
DOI：10.1073/pnas.1814015116
出版社：The National Academy of Sciences of the United States of America
摘要：Temperature modulates growth and development throughout the entire lifecycle of a plant. High temperature (HT) triggers the auxin biosynthesis-dependent growth in aerial tissues. On the other hand, the contribution of auxin to HT-induced root growth is currently under debate. Here we show that the putative intracellular auxin carrier PIN-LIKES 6 (PILS6) is a negative regulator of organ growth and that its abundance is highly sensitive to HT. PILS6 localizes to the endoplasmic reticulum and limits the nuclear availability of auxin, consequently reducing the auxin signaling output. HT represses the PILS6 protein abundance, which impacts on PILS6-dependent auxin signaling in roots and root expansion. Accordingly, we hypothesize that PILS6 is part of an alternative mechanism linking HT to auxin responses in roots.
关键词：high temperature ; auxin signaling ; PILS proteins ; endoplasmic reticulum ; root growth