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J Integr Plant Biol ›› 2003, Vol. 45 ›› Issue (12): 1489-1496.
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LI Ji, LIU Jin-Yuan
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Abstract:
A novel chitinase gene (GhChia7 ) was isolated from salicylic acid (SA)-treated cotton cotyledons and characterized by DNA sequence analysis of its cDNA and genomic DNA clone. The deduced amino acid sequence, designated as class Ⅶ chitinase, shares about 30% identity to class Ⅰ or Ⅱ chitinases, and does not correspond to any of the previously characterized classes Ⅰ-Ⅵ chitinases. Northern blotting analysis showed that the transcripts of GhChia7 were abundant both in cotton fibers and in the roots of the seedlings. The accumulation of GhChia7 mRNA in SA-treated cotyledons reached maximum at 7.5 mmol/L concentration after 18 h. Results indicate that GhChia7 might play an important role in cotton抯 active defense response.
Key words: Gossypium hirsutum , chitinase gene, salicylic acid, cotton defense
LI Ji, LIU Jin-Yuan. A Novel Cotton Gene Encoding a New Class of Chitinase[J]. J Integr Plant Biol, 2003, 45(12): 1489-1496.
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