Genetic divergence and molecular characterization of sorghum hybrids and their parents for reaction to Atherigona soccata (Rondani).

Dhillon, M K and Sharma, H C and Folkertsma, R T and Chandra, S (2006) Genetic divergence and molecular characterization of sorghum hybrids and their parents for reaction to Atherigona soccata (Rondani). Euphytica, 149 (1-2). pp. 199-210. ISSN 0014-2336

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Simple sequence repeat (SSR) markers linked to quantitative trait loci (QTL) associated with resistance to sorghum shoot fly, Atherigona soccata resistance were used to characterize the genetic and phenotypic diversity of 12 cytoplasmic male-sterile (CMS) and maintainers, 12 restorer lines, and 144 F1 hybrids. The genetic diversity was quite high among the shoot fly-susceptible parents and the hybrids based on them, as indicated by high polymorphic information content (PIC) values, while limited genetic diversity was observed among shoot fly-resistant lines. The phenotypic and genotypic dissimilarity analysis indicated that the shoot fly-resistant and -susceptible parents were 73.2 and 38.5% distinct from each other, and the morphological and genetic distances of certain resistant and susceptible cross combinations was more than their resistant or susceptible parents. Genetic variability among the groups was low (10.8%), but high within groups (89.2%). The genetic and morphological distances suggested that the F1 hybrids were closer to CMS (5 to 12% dissimilar) than the restorer (11 to 87% dissimilar), suggesting that CMS influences the expression of resistance to sorghum shoot fly. The SSR markers can be used to characterize the homologous traits in sorghum germplasm.

Item Type: Article
Uncontrolled Keywords: Sorghum shoot fly, Atherigona soccataSSR markers, sorghum, resistance, cytoplasmic male-sterility
Subjects: Mandate crops > Sorghum
Depositing User: Mr Sanat Kumar Behera
Date Deposited: 08 Oct 2011 12:15
Last Modified: 11 Mar 2012 02:05
Official URL:
Acknowledgement: We thank Dr. J.H. Crouch, former Theme Leader, Biotechnology, ICRISAT for providing funds for these studies and Drs. P.M. Gour and Ashok Chhabra for their critical comments on the manuscript. The authors also wish to thank entomology staff, Messrs. G. Pampapathy, J. Raja Rao, V. Venkateshwara Rao, Madhusudhan Reddy, K. Hareendranath, and S.V.N. Chandra for their help in collecting the phenotypic data, Mr. G. Somaraju for genotyping and Mr. Prasanth for their help in the statistical analysis of the data.
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