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Acta Biochimica et Biophysica Sinica 2009 41(4):316-324; doi:10.1093/abbs/gmp020
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© The Author 2009. Published by ABBS Editorial Office in association with Oxford University Press on behalf of the Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences.

A cotton gene encoding a polygalacturonase inhibitor-like protein is specifically expressed in petals

Haiyan Shi{dagger}, Li Zhu{dagger}, Ying Zhou, Gang Li, Liang Chen and Xuebao Li*

Hubei Kei Laboratory of Genetic Regulation and Integrative Biology, College of Life Sciences, HuaZhong Normal University, Wuhan 430079, China

* Corresponding address. Tel/Fax: +86-27-67862443; E-mail: xbli{at}mail.ccnu.edu.cn


  Abstract

A cDNA encoding a polygalacturonase-inhibitor-like protein (PGIP) was isolated from cotton flower cDNA library. The cDNA, designated GhPS1 (GenBank accession No. ABO47744 [GenBank] ), encodes a protein with 370 amino acids that shares high similarity with the known plant PGIPs. Fluorescent microscopy indicated that GhPS1 protein localizes on the cell membranes as well as in cytoplasm. Real-time quantitative RT–PCR and northern blot analyses showed that GhPS1 was specifically expressed in cotton petals. Furthermore, the GhPS1 expression was gradually up-regulated in petal development, and its transcripts were accumulated to the highest level in the petals at anthesis. However, its expression level was declined rapidly in senesced petals after flowering. At low temperature, the GhPS1 gene expression was gradually decreased to very low level in petals. Collectively, our results suggest that GhPS1 gene might be involved in cotton petal development and senescence, and in response to cold stress.

Keywords    cotton (Gossypium hirsutum); petal development; polygalacturonase inhibitor-like protein; gene expression

Received: October 27, 2008; Accepted: February 11, 2009

{dagger} These authors contributed equally to this work.


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