Abstract

PEREZ, Sandra et al. Expression of four defenSe genes against tobacco mosaic virus (TMV) in two varieties of tobacco (Nicotiana tabacum L.). Rev. Protección Veg. [online]. 2009, vol.24, n.1, pp. 29-34. ISSN 2224-4697.

Tobacco Mosaic Virus (TMV) is an economically important disease infecting crops worldwide. The objective of the present work was to evaluate the expression of representative sequences from N. tabacum genome in two Cuban tobacco varieties (BHmN and Corojo) with a different behavior in the pathogenic interaction. Leaf samples were taken at 0, 48 hours and seven days after virus inoculation to proceed with the total RNA extraction (Trizol method) and the primers were designed using sequences of tobacco defense genes to analyse their expression by RT-PCR. At seven days after inoculation, a b 1,3 glucanase expression was observed in both varieties, which was higher in the resistant one. Chitinase was induced at 48 h in the resistant variety with no expression seven days after inoculation. Phosphatase serine-threonine and the heat shock protein were expressed in both varieties at all the time tested; however the expression was a little higher in BHmN variety. In this study, the induction of b 1,3 glucanase in N. tabacum plants inoculated with TMV was likely to be related to the hypersensible response and the acquired systemic resistance.

Keywords : tobacco mosaic virus; expressed sequences; tobacco.

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