Abstract

SANZON GOMEZ, Diana et al. Morphological Changes in Cells of Chilli CM334 Inoculated with Phytophthora capsici and Fusarium oxysporum. Rev. mex. fitopatol [online]. 2012, vol.30, n.1, pp.66-71. ISSN 2007-8080.

The chilli (Capsicum annuum) CM334 is resistant to oomycete Phytophthora capsici (Pc), such resistance is manifested by a hypersensitive reaction (HR); however, this genotype is susceptible to Fusarium oxysporum (Fo). In this study we compared the cellular changes in the HR-induced by Pc, incompatible interaction (II), and Fo-induced necrosis, compatible interaction (CI). The necrosis and colonization by the oomycete in II was confined to the site of inoculation in the stem, and in CI, the pathogen colonized the whole stem and the necrosis was limited to the site of inoculation. Cell wall degradation was evident in the CI, whereas in the II, only the collapse of the cells was observed. In the II, 31% of the nuclei of cortical cells were red suggesting a HR and in the CI 71% of the nuclei were globose and light gray suggesting a death by necrosis.

Keywords : Compatible interaction; incompatible interaction; oomycetes; hypersensitive reaction; programmed cell death; necrosis.