Influence of Cytoplasmic Male Sterility on Expression of Different Mechanisms of Resistance in Sorghum to Atherigona soccata (Diptera: Muscidae)

Dhillon, M K and Sharma, H C and Naresh, J S and Singh, R and Pampapathy, G (2006) Influence of Cytoplasmic Male Sterility on Expression of Different Mechanisms of Resistance in Sorghum to Atherigona soccata (Diptera: Muscidae). Journal of Economic Entomology, 99 (4). pp. 1452-1461. ISSN 0022-0493

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Abstract

Atherigona soccata (Rondani) (Diptera: Muscidae) is one of the most important pests of sorghum, Sorghum bicolor (L.) Moench, in Asia, Africa, and the Mediterranean Europe. Exploitation of cytoplasmic male sterility (CMS) for hybrid production has resulted in considerable narrowing of the genetic base and may increase the vulnerability of this crop to insect pests. Therefore, we studied the expression of different mechanisms of resistance in sorghum to A. soccata in CMS (A) and maintainer (B) lines of 12 genotypes under Þeld and greenhouse conditions. The CMS lines of A. soccata-resistant genotypes were preferred for oviposition (78.5 versus 71.5% plants with eggs) and suffered greater deadheart incidence (47.6 versus 41.6%) than the corresponding maintainer lines, whereas such differences were not apparent in CMS lines belonging to the susceptible genotypes (92.7 versus 92.3% plants with eggs and 75.6 versus 74.6% deadhearts) under multichoice Þeld conditions. Similar differences also were observed under controlled conditions in the greenhouse. The larval period (9.0 versus 8.8 d) and pupal mortality (18.4 versus 13.4%) were greater on maintainer lines than that on the CMS lines in the resistant group. The male and female pupal weights, fecundity, and antibiosis index were greater on the CMS than on the maintainer lines. The maintainer lines showed better recovery resistance than the CMS lines, but no such differences were observed in tiller deadhearts. The differences in susceptibility to A. soccata were greater in the A. soccata resistant CMS and maintainer lines than in the CMS and maintainer lines belonging to susceptible genotypes. Conversion of A. soccata-resistant genotypes into alternate less susceptible cytoplasmic backgrounds may be undertaken for developing sorghum hybrids with stable resistance to A. soccata.

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Atherigona soccata, cytoplasmic male sterility, mechanisms of resistance
Subjects:	Mandate crops > Sorghum
Depositing User:	Mr Sanat Kumar Behera
Date Deposited:	09 Oct 2011 07:17
Last Modified:	09 Oct 2011 07:17
URI:	http://oar.icrisat.org/id/eprint/2109
Official URL:
Projects:	UNSPECIFIED
Funders:	Suri Sehgal Foundation
Acknowledgement:	We thank G. T. Gujar, Indian Agricultural Research Institute, Pusa, New Delhi, India, for critical comments on the manuscript; Suri Sehgal Foundation for extending funds for these studies; B.V.S. Reddy for providing the seeds of some of the CMS and the maintainer lines; Messers J. Raja Rao, V. Venkateshwara Rao, K. Hareendranath, Madhu Sudhan Reddy, S.V.N. Chandra, and Ponnamma for help in these studies; and S. Chandra and Prasanth for help in statistical analysis of the data.
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