The Role of Edaphic Factors in Disease Development

Jordan, W R and Clark, R B and Seetharama, N (1984) The Role of Edaphic Factors in Disease Development. In: Proceedings of the Consultative Group Discussion on Research Needs and Strategies for Control of Sorghum Root and Stalk Rot Diseases, 27 Nov - 2 Dec 1983, Bellagio, Italy.

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This paper presents a brief overview of the roles of abiotic stresses in the modification of processes contributing to the growth and grain yield of sorghum in both the absence and presence of biotic (disease) stresses. Water, temperature, and nutrient stresses promote yield losses through their effects on interception of solar radiation and production of photosynthate. Formation and maintenance of active green leaf area is essential for continued production of photosynthate to maintain carbon and energy flow to both developing gram and plant tissues. Abiotic stresses predispose host tissues to pathogen invasion and promote proliferation and spread of disease in plant tissues, but the mechanism(s) are unknown. The association of charcoal rot with stress during gta,rr filling lends support to the view that carbohydrate mobilization from stalk and root tissues may be intimately associated with host resistance. Further research is needed to define the nature of changes induced by stress that predispose host roots to infection. Since infection and proliferation of the pathogen in host tissues seem to be controlled independently, the changes allowing spread should be studied further. Finally, interactions of abiotic stresses should be studied in a manner that will allow formulation of host-pathogen models necessary to explore possible common bases for disease development and resistance.

Item Type: Conference or Workshop Item (Paper)
Subjects: Mandate crops > Sorghum
Depositing User: Library ICRISAT
Date Deposited: 06 Dec 2011 05:27
Last Modified: 06 Dec 2011 05:27
Acknowledgement: UNSPECIFIED
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