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Int. J. Mol. Sci. 2012, 13(1), 540-551; doi:10.3390/ijms13010540
Article

A Chitosan Induced 9-Lipoxygenase in Adelostemma gracillimum Seedlings

1,2,3
, 1
, 3
 and 1,*
1 State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, China 2 Graduate School of the Chinese Academy of Sciences, Beijing 100049, China 3 Life Science College, Southwest Forestry University, Kunming 650224, China
* Author to whom correspondence should be addressed.
Received: 26 October 2011 / Revised: 20 November 2011 / Accepted: 12 December 2011 / Published: 5 January 2012
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Abstract

Oxylipins generated by the lipoxygenase (LOX) pathway play an important role in plant defense against biotic and abiotic stress. In chitosan-treated Adelostemma gracillimum seedlings, obvious accumulation of 9-LOX-derived oxylipins, namely 9,10,11-trihydroxy-12-octadecenoic acid, was detected. Using degenerate primers, a LOX-specific fragment putatively encoding LOX was obtained by RT-PCR, and a 2.9-kb full-length cDNA named AgLOX1 was isolated by RACE from chitosan-induced A. gracillimum seedlings. Genomic Southern analysis implied that there was only one copy of AgLOX1 in the A. gracillimum genome. AgLOX1 was expressed in Escherichia coli and the recombinant protein was partially purified. The enzyme converted linoleic and linolenic acids almost exclusively to their 9-hydroperoxides. AgLOX1 encoded a 9-lipoxygenase. Northern blot analysis indicated that chitosan-induced AgLOX1 transcript accumulation peaked at 8 h after initiation of treatment, whereas trihydroxy derivatives accumulation was highest at 24 h after elicitation. Results showed that chitosan-induced AgLOX1 encoded a 9-lipoxygenase potentially involved in the defense response through 9-LOX pathway leading to biosynthesis of antimicrobial compounds in A. gracillimum seedlings.
Keywords: Adelostemma gracillimum; lipoxygenase; chitosan; trihydroxyl octadecenoic acid; functional expression; AgLOX1 Adelostemma gracillimum; lipoxygenase; chitosan; trihydroxyl octadecenoic acid; functional expression; AgLOX1
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Li, J.; Zhao, P.-J.; Ma, C.-L.; Zeng, Y. A Chitosan Induced 9-Lipoxygenase in Adelostemma gracillimum Seedlings. Int. J. Mol. Sci. 2012, 13, 540-551.

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