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Published on August 20, 2008; 10.1104/pp.108.120154

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Received April 1, 2008
Accepted August 10, 2008

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

Nan Ma , Jingqi Xue , Yunhui Li , Xiaojing Liu , Fanwei Dai , Wensuo Jia , Yunbo Luo , and Junping Gao *

Department of Ornamental Horticulture, China Agricultural University; Department of Pomology, China Agricultural University; Department of Fruit Biology, China Agricultural University

* Corresponding author; email: gaojp{at}cau.edu.cn.

Aquaporins are water channel proteins which 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 sub-epidermal (AbsE) cells, and decreased petal water content in rose (Rosa hybrida) cv. 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 have shown 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 AbsE cells. The expression of Rh-PIP2;1 is highly correlated with petal expansion and tightly down-regulated by ethylene. Furthermore, we demonstrated 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 ethylene inhibits petal expansion of roses at least partially by suppressing Rh-PIP2;1 expression.




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K. Tungngoen, P. Kongsawadworakul, U. Viboonjun, M. Katsuhara, N. Brunel, S. Sakr, J. Narangajavana, and H. Chrestin
Involvement of HbPIP2;1 and HbTIP1;1 Aquaporins in Ethylene Stimulation of Latex Yield through Regulation of Water Exchanges between Inner Liber and Latex Cells in Hevea brasiliensis
Plant Physiology, October 1, 2009; 151(2): 843 - 856.
[Abstract] [Full Text] [PDF]


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