Mechanisms of resistance to shoot fly, Atherigona soccata in sorghum

Dhillon, M K and Sharma, H C and Singh, R and Naresh, J S (2005) Mechanisms of resistance to shoot fly, Atherigona soccata in sorghum. Euphytica, 144 (3). pp. 301-312. ISSN 0014-2336

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Abstract

Sorghum shoot fly, Atherigona soccata (Rondani) is an important pest of sorghum in Asia, Africa, and Mediterranean Europe, and host plant resistance is an important component for the management of this pest. The levels of resistance in the cultivated germplasm are low to moderate, and therefore, it is important to identify genotypes with different mechanisms of resistance to pyramid the resistance genes. We studied the antixenosis for oviposition, antibiosis, and tolerance components of resistance in a diverse array of shoot fly-resistant and -susceptible genotypes. The main plants and tillers of SFCR 151, ICSV 705, SFCR 125, and, IS 18551 experienced lower shoot fly deadhearts at 28 days after seedling emergence, produced more number of productive tillers. The insects fed on these genotypes also exhibited longer larval period (10.1–11.0 days compared to 9.3 days on Swarna), lower larval survival and adult emergence (54.7–67.8 and 46.7–52.2% compared to 73.3 and 60.6% on Swarna, respectively), and lower growth and adult emergence indices as compared to the susceptible check, Swarna. Physico-chemical traits such as leaf glossiness, trichome density, and plumule and leaf sheath pigmentation were found to be associated with resistance, and chlorophyll content, leaf surface wetness, seedling vigor, and waxy bloom with susceptibility to shoot fly and explained 88.5% of the total variation in deadhearts. Step-wise regression indicated that 90.4% of the total variation in deadhearts was due to leaf glossiness and trichome density. The direct and indirect effects, correlation coefficients, multiple and step-wise regression analysis suggested that deadhearts, plants with eggs, leaf glossiness, trichomes on the abaxial surface of the leaf, and leaf sheath pigmentation can be used as marker traits to select for resistance to shoot fly, A. soccata in sorghum.

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Atherigona soccata, Sorghum bicolor, Sorghum shoot fly, resistance mechanisms
Subjects:	Mandate crops > Sorghum
Depositing User:	Mr Sanat Kumar Behera
Date Deposited:	09 Oct 2011 10:58
Last Modified:	09 Oct 2011 10:58
URI:	http://oar.icrisat.org/id/eprint/2115
Official URL:	http://dx.doi.org/10.1007/s10681-005-7400-4
Projects:	UNSPECIFIED
Funders:	Suri Sehgal Foundation
Acknowledgement:	We thank Dr B.V.S. Reddy for providing seeds of some shoot fly-resistant and -susceptible genotypes, Messers G. Pampapathy, V. Venkateshwara Rao, J. Raja Rao, K. Hareendranath, Madhusudan Reddy, S.V.N. Chandra, and Mrs Ponnamma for their help in observations, Mr Ravi kumar for providing the GenStat(6th Edition) compatible program on path analysis, and Suri Sehgal Foundation for extending funds for these studies to ICRISAT, Asia Center, Patancheru, India.
Links:	Author

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