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Summa Phytopathologica

Print version ISSN 0100-5405

Abstract

SANTOS, Ricardo Lima dos; PAVAN, Marcelo Agenor; SILVA, Norberto da  and  FUMES, Leandro Augusto Andrade. Inheritance of resistance to powdery mildew in pea and pathogenesis-related aspects. Summa phytopathol. [online]. 2012, vol.38, n.2, pp. 119-122. ISSN 0100-5405.  http://dx.doi.org/10.1590/S0100-54052012000200002.

The inheritance of resistance to powdery mildew in the pea cultivar MK-10 and some histological aspects of infection were assessed. For the inheritance study, F1, F2, backcrosses and F3 generations of MK-10 crossed with two susceptible populations were evaluated. Histological evaluations included percentage of germinated conidia, percentage of conidia that formed appresoria, percentage of conidia that established colonies, and number of haustoria per colony. Segregation ratios obtained in the resistance inheritance study were compared by Chi-square (ײ) test and the histological data were analyzed by Tukey's test at 5% probability. It was concluded that resistance of MK-10 to powdery mildew is due to a pair of recessive alleles since it is expressed in the pre-penetration stage and completed by post-penetration localized cellular death, characteristic of the presence of the pair of recessive alleles er1er1.

Keywords : Erysiphe pisi; genetic resistance; host-pathogen interaction; MK-10; histology.

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