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KMID : 0368420080510010048
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Journal of Plant Biology
2008 Volume.51 No. 1 p.48 ~ p.51
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TohpreproHypSys- A Gene Expression and Defense Protein Activity in the Tobacco Wounding Response
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Ren Feng
Lian Hai-Jiang
Chen Liang
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Abstract
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Tobacco hydroxyproline-rich glycopeptide systemin precursor A (TobpreproHypSys-A), from which TobHypSys I and II are released, plays a crucial role in defense responses. Here, we investigated the expression otTobpreproHypSys- A and the activity of defense proteins in tobacco organs during wounding. Expression was induced more rapidly in upper, non-wounded leaves than in lower, wounded leaves. At 24 h after mechanical wounding, expression was tow in the roots, but increased in the stems and flowers, although to a lesser extent than in the leaves. At 3 or 10 d after insect-wounding, expression did not differ among organs, suggesting thatTobpreproHypSys- A could be induced globally and continuously throughout such stress. During that period, the activity of two defense proteins ? PPO and PI ? was consistent with the expression ofTobpreproHyp- Sys- A in various organs. This indicates that those proteins also could be regulated by TobHypSys, both globally and continuously.
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KEYWORD
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Nicotiana tabacum, polyphenol oxidase, proteinase inhibitor, systemin, wounding response
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