Potassium phosphite as a resistance inducer in tomato mutants against Phytophthora infestans
DOI:
https://doi.org/10.18378/rvads.v14i2.6129Keywords:
Solanum lycopersicum, Micro-Tom, ReekAbstract
The objective of this study was to evaluate the effect of potassium phosphite as a resistance inducer in the management of Phytophthora infestans, causal agent of the reek, in tomato mutants for trichomes and hormones, to identify their mode of action and the possible signaling pathways involved. Eleven mutant genotypes (hair absent, Wooly, hairless, Galapagos, notabilis, Never ripe, epinastic, procera, curl3, 35S::nahG and dgt, Nr) which are in the same genetic background as the wild parental, cultivate Micro-Tom. The experiment was carried out in a completely randomized design, in a two - factorial scheme, with four replications. The factor A corresponded to the genotypes used and the factor B applied or not of the inducer. The variables analyzed were: incubation period (PI), final lesion size (TFL) and lesion expansion rate (r). For all variables there was a significant interaction between the genotypes and the application of potassium phosphite. In plants treated with potassium phosphite, the PI in the Galapagos genotype was significantly lower from 52 to 70% relative to the mutant genotypes except Never ripe and 35S::nahG. The application of potassium phosphite increased significantly in 63, 53, and 70% TFL for the Wooly, hairless and procera genotypes, respectively. The r in the genotype procera was significantly lower in 76% of that observed in the Micro Tom, and 50 to 76% in relation to the mutant genotypes when the plants were not treated with potassium phosphite. The most likely signaling pathway for resistance induction by potassium phosphite is that of salicylic acid.
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