Co-5² resistance allele contributes to induce basal defense against Colletotrichum lindemuthianum race 7

Alelo de resistência Co-5² contribui para induzir a defesa basal contra Colletotrichum lindemuthianum raça 7

ABSTRACT

The role of the Co-5² and Co-4² alleles in the early activation of bean immunity against Colletotrichum lindemuthianum is poorly known. Thus, by using the anthracnose-susceptible Sutagao cultivar and the anthracnose-resistant bean G2333, this study aimed to evaluate the presence of the Co-4² and Co-5² alleles by SCAR markers, as well as their role in the respective defense responses, using histochemical tests and diferential gene expression. The results showed that the Co-5² allele contributes to defense responses against anthracnose, since susceptible beans with the Co-4² allele and without the Co-5² allele decreased both the number of callose deposits and the accumulation of reactive oxygen species at the fungus attack sites. Additionally, for the Sutagao cultivar, there was a late response of defense-related genes such as PR-1, PR-3 and Pv-POD. The Co-5² allele contributes to induce defense mechanisms in the Phaseolus vulgaris and C. lindemuthianum interaction.

KEYWORDS:
Phaseolus vulgaris L.; anthracnose; callose deposits; plant defense