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We have carried out a comparative study on chitinase gene expression and enzyme activity in  Lycopersicon chilense  (a drought-tolerant wild tomato) and  L. esculentum  under water stress. Both enzyme assay and Northern blot analysis revealed that chitinase expression was differentially induced by drought among the different genotypes. Higher induction of chitinase was found in tolerant species compared to the sensitive one. Among genotypes examined,  L. chilense  LA2747 presented the highest level of the chitinase induction, while the lowest level was found in  L. esculentum  HR86. Leaves of drought-stressed plants showed the highest expression and roots showed the lowest, with stems being intermediate. Chitinase activity was detected in flowers of both drought-stressed and control plants. The measurement of leaf water potentials of different genotypes revealed a correlation between drought tolerance and the level of chitinase expression during water stress. Our results suggest that the chitinase might be involved in drought tolerance of  L. chilense .

Comparison of Drought-induced Chitinase Expression Between Wild and Cultivated Tomatoes