Abstract
Productivity of Indian mustard, an important oilseed crop of India, is affected by several pathogens. Among them, the hemibiotroph Sclerotinia sclerotiorum, which causes sclerotinia rot disease, is the most devastating fungal pathogen causing up to 90% yield losses. The availability of host resistance is the only efficient approach to control and understand the host–pathogen interaction. Therefore, the present investigation was carried out using six Indian mustard genotypes with contrasting behavior towards sclerotinia rot to study the antioxidant resistance mechanism against S. sclerotiorum. The plants at post-flowering stage were inoculated with five-day-old pure culture of S. sclerotiorum using artificial stem inoculation method. Disease evaluation revealed significant genotypic differences for mean lesion length among the tested genotypes, where genotype DRMR 2035 was found highly resistant, while genotypes RH 1569 and RH 1633 were found highly susceptible. The resistant genotypes had more phenolics and higher activities of peroxidase, catalase and polyphenol oxidase which provide them more efficient and strong antioxidant systems as compared with susceptible genotypes. Studies of antioxidative mechanisms validate the results of disease responses.
Highlights
Oilseed crops play a crucial role in the agricultural-based economy of India [1]
Inoculatedplants plantsshowed showed characteristics characteristics symptoms ofof sclerotinia rot rot as white-greyish lesions on Inoculated symptoms sclerotinia as white-greyish lesions stems while uninoculated plants were healthy with no symptoms
Summary
Oilseed crops play a crucial role in the agricultural-based economy of India [1]. Among the nine major oilseed crops widely cultivated in India, rapeseed-mustard occupies the foremost position because of its greater sustainability under varied agro-ecological situations. Sclerotinia rot caused by Sclerotinia sclerotiorum (Lib.) de Bary, a cosmopolitan soilborne fungal pathogen, is the utmost devastating disease in the present climate [4]. This pathogen does not have any specific host and causes disease in >600 plant species including important oilseed crops viz. Sclerotinia rot symptoms, those due to carpogenic infection, are visible after flowering stage It causes infection in plant parts including stem with typical symptoms of initially soft and white-grayish lesions which extend throughout the stem and lead to plant collapse [6]. Stem lesion length, rate of lesion development over time, and Area Under Disease Progression Curve (AUDPC) are very good parameters for assessing resistance and disease progression over time
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