Structural defence mechanisms in groundnut to rust pathogen


189

Authors

  • C.D. MAYEE and K.T. APET Marathwada Agricultural University, Parbhani 431 402

Keywords:

Defence mechanism, groundnut, Puccinia arachidis, callose depositions, resistance to rust

Abstract

Five rust resistant genotypes of groundnut viz., EC 76446 (292), Nc Ac 927, Nc Ac 17090, PI 215696 and PI 350680 were screened along with two susceptible cultivars; SB XI and Robot 33-1 for morphological and anatomical features, using the sequential section cutting and whole mount technique. Inoculated leaves were examined for infection structures. Resistant genotypes were characterized by smaller sized stomata of low frequency, compact palisade layer, thicker epidermis-cum-cuticle layer and presence of trichomes on abaxial surfaces of leaves. Delayed appearance of visible pustules on the leaf surface was a result of delayed formation of infection peg, intercellular hypae, aggregation of mycelia and formation of subepidermal son. Resistance was characterized by intense callose depositions around the infection foci, while the deformities in subepidermal uredospores clearly indicated obstruction to visible pustule appearance on the leaves of resistant genotypes.

Issue

Vol. 48 No. 2 (1995): Indian Phytopathology

Section

Research Articles

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How to Cite

K.T. APET, C. M. and. (2002). Structural defence mechanisms in groundnut to rust pathogen. Indian Phytopathology, 48(2), 154-159. https://epubs.icar.org.in/index.php/IPPJ/article/view/20708