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Plant Pathology Journal
  Year: 2014 | Volume: 13 | Issue: 2 | Page No.: 100-111
DOI: 10.3923/ppj.2014.100.111
Penetration and Infection Processes of Alternaria brassicicola on Cauliflower Leaf and Alternaria brassicae on Mustard Leaf: A Histopathological Study
Pratibha Sharma, Swati Deep, Dinesh Singh Bhati, Manika Sharma and P. Chowdappa

Abstract:
Alternaria blight caused by Alternaria brassicicola (Schwein) Wiltshire and Alternaria brassicae (Berk) Sacc. is one of the most serious diseases of Cauliflower [Brassica oleracea (L.) var. botrytis] and Mustard [Brassica juncea L.] grown as edible vegetable and oilseed crop, respectively in India. As resistance against these pathogens is not found till now therefore, the exploration of the host-pathogen interaction is much needed. In the present study, the cauliflower-A. brassicicola and mustard-A. brassicae interactions were studied at microscopic level using light and electron microscope. The initial infection processes involve conidia germination, penetration and colonization on the plant surfaces. Several germ-tubes developed from conidia and colonize extensively across the leaf surfaces. Penetration in the plant surface, either directly through the epidermis or via stomata occurred with occasional appressoria formation. Least aggressive A. brassicae isolate was found to infect mustard leaf by spreading over epidermal cells only. Finally, hyphae colonize the leaf cells forming network collapsing epidermal cells to form necrotic lesions which may be due to release of toxin.
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How to cite this article:

Pratibha Sharma, Swati Deep, Dinesh Singh Bhati, Manika Sharma and P. Chowdappa, 2014. Penetration and Infection Processes of Alternaria brassicicola on Cauliflower Leaf and Alternaria brassicae on Mustard Leaf: A Histopathological Study. Plant Pathology Journal, 13: 100-111.

DOI: 10.3923/ppj.2014.100.111

URL: https://scialert.net/abstract/?doi=ppj.2014.100.111

 
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