Sorghum Genetic Resources: Conservation and Diversity Assessment for Enhanced Utilization in Sorghum Improvement uri icon

abstract

  • World collection of sorghum consists of 235,711 accessions, housed innational and international genebanks, of which, ICRISAT genebankholds 37,949 accessions, predominantly landraces from SAT regions.Biologically, this collection represents all basic and intermediate races,and geographic regions. Core/mini core, genotype-based referenceset or in some cases trait-based diversity panels have been developed.These reduced subsets are in demand to discover new sources ofvariation, dissect population structure and diversity, estimate linkagedisequilibria, map marker-trait associations, and mine allelic variationsassociated with agronomically benefi cial traits. More emphasis shouldalso be to discover germplasm with novel seed quality traits impartinghealth benefi ts. Few germplasm, such as IS 18758, IS 1054, and IS 33844,have proved to be an excellent source of desirable plant type, high grainyield, good grain quality, resistant to leaf diseases, and used extensivelyin breeding programs at ICRISAT and elsewhere. New sources suchas IS 26962 and IS 23680 identifi ed as having high Fe and Zn serve aspotential parents for developing improved nutrient dense cultivars. Inaddition, 34 germplasm lines have been directly released as cultivarsin 17 countries. There is a continuous need to identify germplasm lineswith multiple resistances to abiotic and biotic stresses and those withnovel seed quality traits to develop sorghum cultivars and hybridsadapted to diverse agroclimatic conditions. A better understandingof available genetic resources, genomic tools and resources includingsequenced variation in sorghum genome will assist germplasmcurators/breeders effi ciently conserve and utilize diverse germplasmin sorghum improvement

publication date

  • 2014