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JXB Advance Access published online on July 28, 2003
Journal of Experimental Botany, doi:10.1093/jxb/erg238
© 2003 by Oxford University Press
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Received March 13, 2003; accepted June 15, 2003
© 2003 Society for Experimental Biology

GENE NOTE

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

Chun Hu 1, Yu-Jin Hao 2, Chikako Honda 2, Masayuki Kita 2, and Takaya Moriguchi 2*

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

* To whom correspondence should be addressed. E-mail: takaya{at}affrc.go.jp.


  Abstract

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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