Genetic variability for fodder quality traits in sorghum under different water regimes

Kanuganahalli, V and Kodukula, P and Devulapall, R and Deshpande, S and Vadez, V and Blümmel, M (2017) Genetic variability for fodder quality traits in sorghum under different water regimes. In: InterDrought-V, February 21-25, 2017, Hyderabad, India.

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Abstract

Sorghum is grown as a dual purpose crop yielding food (grain) and fodder (stover) in marginal environments of Asia and Sub-Saharan Africa. Application of genomics and trait discovery tools in breeding program can expedite genetic improvement of fodder quality. Earlier reports suggested that a difference of one percentage unit in stover digestibility increases livestock output of 6 to 8%. To characterize fodder quality traits in sorghum and to identify genomic regions related to t[hose traits, a set of mapping population parents (24) were evaluated under two water regimes (control and stress) over 3 years at ICRISAT-Patancheru. In vitro organic matter digestibility (IVOMD%) – a key stover quality trait, test weight (TW-g), stalk yield (SY-Kg/ha) and grain yield (GY-Kg/ha) recorded significant variation across genotype, treatment, year and interaction effects. Across season analyses revealed a range of 45.8% to 50.4% for IVOMD, variation from 1.9g to 4.1g for TW. The SY and GY recorded a mean value of 4552 Kg/ha and 3152 Kg/ha, across years. While heritability estimates across seasons were on higher side for TW (0.85), SY (0.77) and IVOMD (0.70), it was lower for GY (0.39). A positive correlation of 0.63 and 0.79 was observed for SY – IVOMD and plant height (PH) - SY, respectively. This further implied that an opportunity exists for simultaneous improvement in both yield and fodder quality. We identified a parental set of ICSV1 and ICSV700 having consistently contrasting values across all seasons for IVMOD for further genetic mapping of the fodder quality traits in sorghum.

Item Type: Conference or Workshop Item (Paper)
Divisions: Research Program : Innovation Systems for the Drylands (ISD)
CRP: UNSPECIFIED
Uncontrolled Keywords: Genetic variability, fodder quality traits, sorghum, water regimes
Subjects: Mandate crops > Sorghum
Others > Genetics and Genomics
Depositing User: Mr Ramesh K
Date Deposited: 13 Jun 2018 07:50
Last Modified: 13 Jun 2018 07:50
URI: http://oar.icrisat.org/id/eprint/10720
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