Rh-PIP2;1, a rose aquaporin gene, is involved in ethylene-regulated petal expansion.

Plant Physiology
Nan MaJunping Gao

Abstract

Aquaporins are water channel proteins that facilitate the passage of water through biological membranes and play a crucial role in plant growth. We showed that ethylene treatment significantly reduced petal size, inhibited expansion of petal abaxial subepidermal cells, and decreased petal water content in rose (Rosa hybrida 'Samantha'). Here, we report the isolation of a plasma membrane aquaporin (PIP) gene, Rh-PIP2;1, and characterized its potential role in ethylene-inhibited petal expansion. Rh-PIP2;1 is mainly localized on the plasma membrane and belongs to the class 2 subfamily of PIP proteins. We show that Rh-PIP2;1 is an active water channel. The transcripts of Rh-PIP2;1 are highly abundant in petal epidermal cells, especially in the abaxial subepidermal cells. The expression of Rh-PIP2;1 is highly correlated with petal expansion and tightly down-regulated by ethylene. Furthermore, we demonstrate that in Rh-PIP2;1-silenced flowers, petal expansion was greatly inhibited and anatomical features of the petals were similar to those of ethylene-treated flowers. We argue that Rh-PIP2;1 plays an important role in petal cell expansion and that ethylene inhibits petal expansion of roses at least partially by suppressing Rh-PIP2;1 ...Continue Reading

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Citations

Apr 20, 2013·Journal of Experimental Botany·Daofeng LiuJunping Gao
Apr 6, 2011·Plant Physiology·Thomas A ColquhounDavid G Clark
Feb 1, 2013·Journal of Experimental Botany·Mohammed BendahmaneManuel Le Bris
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Jun 20, 2014·The Plant Journal : for Cell and Molecular Biology·Yonglu MengJunping Gao
Aug 6, 2014·Plant Physiology and Biochemistry : PPB·Chuan YueYajun Yang
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Mar 26, 2015·Plant Science : an International Journal of Experimental Plant Biology·Lei DingShiwei Guo
Oct 16, 2016·Plant, Cell & Environment·Michael GroszmannJohn R Evans
Apr 20, 2017·Frontiers in Plant Science·Noushina IqbalM I R Khan
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Feb 10, 2018·Journal of Experimental Botany·Nan MaJunping Gao
Sep 13, 2017·Journal of Integrative Plant Biology·Huijun YanKaixue Tang
Nov 23, 2017·Frontiers in Plant Science·Yaxin LiZhenxian Zhang
Apr 13, 2018·BMC Genomics·Darren Chern Jan WongGregory A Gambetta

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