Abstract
The effects of foliar application of growth substances and mineral nutrition of the host on the development of charcoal rot disease of soybean caused byMacrophomina phaseolina was tested. Among the eight growth substances examined, gibberellic acid was most successful in reducing the disease severity, followed by 3-indoleacetic acid and 2,3,5-triiodobenzoic acid. Low concentrations of these compounds stimulated while high concentrations inhibited the mycelial growth ofM. phaseolina in vitro. Substrate supplementation with different doses of N, P, K and Ca had varying effects on disease development. Disease increased considerably by both excess and defficient N and also by deficient Ca, while excess Ca conferred partial resistance. Glyceollin contents of host roots before and after excess Ca and gibberellic acid (10 mg/L) treatments were estimated. Both compounds significantly increased glyceollin production in infected roots. However, gibberellic acid induced glyceollin synthesis even in uninoculated roots. Changes in the host reaction towards increased resistance was correlated with increased phytoalexin production.
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Chakraborty, U., Chakraborty, B.N. & Purkayastha, R.P. Application of growth substances and mineral nutrition affecting disease development and glyceollin production of soybean. Folia Microbiol 34, 490–497 (1989). https://doi.org/10.1007/BF02814459
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DOI: https://doi.org/10.1007/BF02814459