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Reddy P.S.,Indian Institute of Millets Research | Reddy B.V.S.,Indian International Crops Research Institute for the Semi Arid Tropics | Kumar A.A.,Indian International Crops Research Institute for the Semi Arid Tropics | Sharma H.C.,Indian International Crops Research Institute for the Semi Arid Tropics
Indian Journal of Genetics and Plant Breeding | Year: 2015

Breeding for resistance to sorghum shoot fly in A1 CMS system has been only partially successful. To compare the alternate Cytoplasmic Male Sterility_(CMS) systems for shoot fly resistance, 72 hybrids produced by crossing 36 A-lines carrying six diverse cytoplasms namely, A1, A2, A3, A4(M), A4(G) and A4(VZM), each in six nuclear backgrounds with two common fertility restorers. The hybrids were evaluated during 2006 and 2007 rainy and post rainy seasons in shoot fly screening trials at ICRISAT. ANOVA indicated absence of overall cytoplasmic influence on dead hearts%. The general (GCA) and specific combining ability (SCA) estimates suggested that inheritance for deadhearts was governed by additive-type of gene action. For GCA effects, the A2 and A4(M) cytoplasms and for SCA effects, the A4(G) and A4(M) cytoplasms were superior over other cytoplasms. Overall, the A4(M) cytoplasm seemed to contribute to shoot fly resistance in hybrid combinations. However, use of all the six alternate cytoplasms should not increase the risk of shoot fly in commercial grain production. © 2015, Indian Society of Genetics and Plant Breeding. All rights reserved. Source


Ganapathy K.N.,Indian Institute of Millets Research | Rakshit S.,Indian Institute of Millets Research | Gomashe S.S.,Indian Institute of Millets Research | Audilakshmi S.,Indian Institute of Millets Research | And 2 more authors.
Plant Genetic Resources: Characterisation and Utilisation | Year: 2016

Knowledge on genetic diversity is necessary to determine the relationships among the genotypes, which allow the selection of individual accessions for crop breeding programmes. The present study aimed at assessing the extent and pattern of genetic diversity within a set of 251 sorghum genotypes using SSR markers. A total of 393 alleles were detected from the 251 genotypes, with the number of alleles ranging from 2 (Xcup11) to 24 (Sb5-206) and an average of 10.07 alleles per primer pair. Pairwise Wright's FST statistic and Nei's genetic distance estimates revealed that the race and geographical origin were responsible for the pattern of diversity and structure in the genetic materials. In addition, the analysis also revealed high genetic differentiation between the rainy and post-rainy sorghum groups. Narrow diversity was observed among the different working groups in the rainy (restorers and varieties) and post-rainy (varieties and advanced breeding lines) sorghum groups. Neighbour-joining and STRUCTURE analysis also classified 44 elite lines broadly into two distinct groups (rainy and post-rainy). However, limited diversity within the rainy and post-rainy sorghum groups warranted an urgent need for the utilization of diverse germplasm accessions for broadening the genetic base of the Indian breeding programme. The diverse germplasm accessions identified from the mini-core accessions for utilization in breeding programmes are discussed. Copyright © NIAB 2016 Source

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