Journal
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
Volume 69, Issue 5, Pages 1058-1063Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1271/bbb.69.1058
Keywords
adaptive evolution; Fusarium head blight (FHB); glycoside hydrolase family 10 (GH10) and family 11 (GH11); glycoside hydrolase family 18 (GH18) chitinase; pathogenesis-related proteins (PR proteins)
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XIP-I and TAXI-I are wheat (Triticum aestivum L) grain proteins that inhibit microbial xylanases used in food processing. Although their biochemical properties and structural features were established recently, very little is known about their expression and their family members in wheat plants. To clarify. the role of these xylanase inhibitor proteins in plant defense, we examined the expression of the XIP-type genes in response to a variety of biotic and abiotic signals. Although Xip-I was not expressed in flowering spikelets inoculated with Fusarium graminearum, transcription of Xip-I was greatly enhanced in Erysiphe graminis-infected leaves. Thus, unlike Taxi-I, Xip-I is pathogen-inducible, and unlike Taxi-III and Taxi-IV, its expression depends on the type of the pathogen and/or infected tissue. Xip-I was expressed when the leaves were wounded, and its expression was significantly elevated by treatment with methyl jasmonate (MeJA). The different expression profiles of XIP- and TAXI-type genes suggest distinct roles in plant defense.
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