Control of stem rot of soybean incited by Sclerotium rolfsii through metal salts
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Authors
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T.K. BAG and A.K. SINHA
Department of Plant Pathology, Bidhan Chandra Krishi Vishwavidyalaya, Mohanpur 741252, West Bengal
Keywords:
Soybean, Sclerotium rolfsii, stem rot, metal salts, seed soak, induced resistanceAbstract
When susceptible soyabean seeds (cv. IS-79-291) were given a pre-sowing soak treatment for 24 h in a range (10-5, 10-4 and 10-3 M) of dilute solutions of 6 metal salts (barium sulfate, lithium sulfate, manganese sulfate, cupric chloride, ferric chloride and zinc chloride) and pot-grown 2-week-old plants were soil inoculated with S. rolfsii [Corticium rolfsii], the first 5 salts substantially (61-77%) inhibited disease symptoms and reduced plant mortality by 45 to 75% as compared with the control. Zinc chloride recorded milder effects. Only manganese sulfate had a graded concentration effect, giving maximum control at 10-3 M. For the others, the optimum was either at 10-4 or 10-5 M. None of the salts had any appreciable inhibitory effect on sclerotium germination. Biochemical studies with infected stem tissue from the optimum treatment for each salt, compared with the control, showed an appreciable increase in total phenol and o-dihydroxyphenol content and also in peroxidase activity but reductions in pectolytic enzyme activity. The possible use of these salts in plant disease control is discussed.
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