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Thaumatin-like protein (TLP) is present as a large family in plants, and individual members play different roles in various responses to biotic and abiotic stresses. Here we studied the role of 33 putative grape ( Vitis vinifera  L.)  TLP  genes ( VvTLP ) in grape disease resistance. Heat maps analysis compared the expression profiles of 33 genes in disease resistant and susceptible grape species infected with anthracnose ( Elsinoe ampelina ), powdery mildew ( Erysiphe necator ) or  Botrytis cinerea . Among these 33 genes, the expression level of  TLP29  increased following the three pathogens inoculations, and its homolog from the disease resistant Chinese wild grape  V .  quinquangularis  cv. ‘Shang-24’, was focused for functional studies. Over-expression of  TLP29  from grape ‘Shang-24’ ( VqTLP29 ) in  Arabidopsis thaliana  enhanced its resistance to powdery mildew and the bacterium  Pseudomonas syringae  pv. tomato DC3000, but decreased resistance to  B .  cinerea . Moreover, the stomatal closure immunity response to pathogen associated molecular patterns was strengthened in the transgenic lines. A comparison of the expression profiles of various resistance-related genes after infection with different pathogens indicated that  VqTLP29  may be involved in the salicylic acid and jasmonic acid/ethylene signaling pathways.

Analysis of the grape (Vitis vinifera L.) thaumatin-like protein (TLP) gene family and demonstration that TLP29 contributes to disease resistance