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The Role of Edaphic Factors in Disease Development

OAR@ICRISAT

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Relation http://oar.icrisat.org/4138/
 
Title The Role of Edaphic Factors in Disease Development
 
Creator Jordan, W R
Clark, R B
Seetharama, N
 
Subject Sorghum
 
Description 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.
 
Date 1984
 
Type Conference or Workshop Item
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/4138/1/CP_181.pdf
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.