GGE biplot analysis to evaluate genotype, environment and their interactions in sorghum multi-location data

Rakshit, S and Ganapathy, K N and Gomashe, S.S. and et al, . (2012) GGE biplot analysis to evaluate genotype, environment and their interactions in sorghum multi-location data. Euphytica, 185 (3). pp. 465-479. ISSN 1573-5060

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Abstract

Sorghum [Sorghum bicolor (L.) Moench] is a very important crop in the arid and semi-arid tropics of India and African subcontinent. In the process of release of new cultivars using multi-location data major emphasis is being given on the superiority of the new cultivars over the ruling cultivars, while very less importance is being given on the genotype × environment interaction (GEI). In the present study, performance of ten Indian hybrids over 12 locations across the rainy seasons of 2008 and 2009 was investigated using GGE biplot analysis. Location attributed higher proportion of the variation in the data (59.3–89.9%), while genotype contributed only 3.9–16.8% of total variation. Genotype × location interaction contributed 5.8–25.7% of total variation. We could identify superior hybrids for grain yield, fodder yield and for harvest index using biplot graphical approach effectively. Majority of the testing locations were highly correlated. ‘Which-won-where’ study partitioned the testing locations into three mega-environments: first with eight locations with SPH 1606/1609 as the winning genotypes; second mega-environment encompassed three locations with SPH 1596 as the winning genotype, and last mega-environment represented by only one location with SPH 1603 as the winning genotype. This clearly indicates that though the testing is being conducted in many locations, similar conclusions can be drawn from one or two representatives of each mega-environment. We did not observe any correlation of these mega-environments to their geographical locations. Existence of extensive crossover GEI clearly suggests that efforts are necessary to identify location-specific genotypes over multi-year and -location data for release of hybrids and varieties rather focusing on overall performance of the entries.

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Sorghum bicolor – Multi-location data – GE interaction – GGE biplot – Stability – Mega-environment
Subjects:	Mandate crops > Sorghum Others > Genetics and Genomics
Depositing User:	Mr Sanat Kumar Behera
Date Deposited:	21 May 2012 06:25
Last Modified:	21 May 2012 06:25
URI:	http://oar.icrisat.org/id/eprint/5932
Official URL:	http://dx.doi.org/10.1007/s10681-012-0648-6
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	The authors thank Dr. P. Rajendrakumar of Directorate of Sorghum Research for his valuable input in improving the discussion.
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