Journal of Plant Biology

, Volume 51, Issue 1, pp 48–51 | Cite as

TohpreproHypSys- A Gene Expression and Defense Protein Activity in the Tobacco Wounding Response



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.


Nicotiana tabacum polyphenol oxidase proteinase inhibitor systemin wounding response 


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Copyright information

© The Botanical Society of Korea 2008

Authors and Affiliations

  1. 1.College of Life SciencesHuaZhong Normal UniversityWuhanChina

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