Effect of pattern and severity of moisture-deficit stress on stalk-rot incidence in sorghum. II. Effect of source/sink relationships

Seetharama, N and Sachan, R C and Huda, A K S and Gill, K S and Rao, K N and Bidinger, F R and Reddy, D M (1991) Effect of pattern and severity of moisture-deficit stress on stalk-rot incidence in sorghum. II. Effect of source/sink relationships. Field Crops Research, 26 (3-4). pp. 355-374. ISSN 0378-4290

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Abstract

Stalk-rot of grain sorghum [Sorghum bicolor (L.) Moench] is most commonly associated with weakly parasitic root and stalk-rot fungi when the host plants are subjected to environmental stresses. The incidence of rots is generally more in high-grain-yield environments associated with high plant density or fertilizer application. The effects of time of occurrence and degree of moisture deficit stress (moisture stress) on grain and biomass yields, and the natural incidence of stalk-rots were studied. Stress during grain-filling had a greater effect on incidence of rots than stress at earlier stages. Grain-yield and disease incidence were differently affected by timing and severity of moisture stress. Stalk-rot incidence was most commonly and strongly associated with moisture stress at the terminal stage of growth. However, stress during panicle development induced changes in the sink size (grain number) or root-growth pattern, which in turn influenced both the timing and extent of stalk-rot incidence. The amount of biomass produced during the later part of the grain-filling period was positively correlated with lower disease susceptibility. The distribution index (i.e., the ratio of grain-yield to biomass produced after flowering) could be generally used to predict disease susceptibility. There were no simple correlations between biomass, grain-yield or yield components, and stalk-rot.

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Stalk-rot, Grain sorghum, Abiotic stress factors, Physiological stress, Crop growth
Subjects:	Mandate crops > Sorghum
Depositing User:	Ms. Ishrath Durafsha
Date Deposited:	13 Feb 2014 14:36
Last Modified:	13 Feb 2014 14:36
URI:	http://oar.icrisat.org/id/eprint/7502
Official URL:	http://dx.doi.org/10.1016/0378-4290(91)90011-J
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	We are grateful to I.N. Rao for typing, and to V. Ramesh for drawing the figures.
Links:	Google Scholar

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