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JXB Advance Access originally published online on July 28, 2003
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Journal of Experimental Botany, Vol. 54, No. 390, pp. 2193-2194, September 1, 2003
© 2003 Oxford University Press

Putative PIP1 genes isolated from apple: expression analyses during fruit development and under osmotic stress

Received 13 March 2003; Accepted 15 June 2003

Chun-Gen Hu1,2, Yu-Jin Hao1, Chikako Honda1, Masayuki Kita1 and Takaya Moriguchi*,1

1 National Institute of Fruit Tree Science, Tsukuba, Ibaraki 305-8605, Japan
2 Huazhong Agricultural University, Wuhan, Hubei 430070, China

* To whom correspondence should be addressed. Fax: +81 29 838 6437. E-mail: takaya{at}affrc.go.jp

To gain insight into the function of plasma membrane intrinsic protein (PIP) genes in apple, two genes, MdPIP1a and MdPIP1b, were isolated. MdPIP1 expression was in accordance with the volume increase during fruit development, which is a loading process of water and solutes. In addition, the expression of MdPIP1 was up-regulated in the stems by osmotic stress. These results indicate that MdPIP1 may play important roles not only in fruit expansion, but also in maintaining water homeostasis under stress conditions.

Key words: Apple, fruit expansion, gene expression, osmotic stress, plasma membrane intrinsic protein (PIP).


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