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Hyderabad, India

Aruna C.,Direct Of Sorghum Research | Rakshit S.,Direct Of Sorghum Research | Shrotria P.K.,Govind Ballabh Pant University of Agriculture & Technology | Pahuja S.K.,CCS Haryana Agricultural University | And 6 more authors.
Journal of Agricultural Science | Year: 2016

Forage sorghum is an important component of the fodder supply chain in the arid and semi-arid regions of the world because of its high productivity, ability to utilize water efficiently and adaptability to a wide range of climatic conditions. Identification of high-yielding stable genotypes (G) across environments (E) is challenging because of the complex G × E interactions (GEI). In the present study, the performance of 16 forage sorghum genotypes over seven locations across the rainy seasons of 2010 and 2011 was investigated using GGE biplot analysis. Analysis of variance revealed the existence of significant GEI for fodder yield and all eight associated phenotypic traits. Location accounted for a higher proportion of the variation (0·72-0·91), while genotype contributed only 0·06-0·21 of total variation in different traits. Genotype-by-location interactions contributed 0·02-0·13 of total variation. Promising genotypes for fodder yield and each of the associated traits could be identified effectively using a graphical biplot approach. The majority of test locations were highly correlated. A 'Which-won-where' study partitioned the test locations into two mega-environments (MEs): ME1 was represented by five locations with COFS 29 as the best genotype, while ME2 had two locations with S 541 as the best genotype. The existence of two MEs suggested a need for location-specific breeding. Genotype-by-trait biplots indicated that improvement for forage yield could be achieved through indirect selection for plant height, leaf number and early vigour. Copyright © Cambridge University Press 2015. Source

Umakanth A.V.,Direct Of Sorghum Research | Bhat B.V.,Direct Of Sorghum Research | Blummel M.,Direct Of Sorghum Research | Blummel M.,Indian International Crops Research Institute for the Semi Arid Tropics | And 3 more authors.
Indian Journal of Animal Sciences | Year: 2014

Genetic control of the lignification process through use of brown mid-rib (bmr) mutations has offered the most direct and productive approach to reducing lignin concentration and increasing digestibility of sorghums. Brown midrib genes were introgressed from IS 21888 (bmr-3) and IS 21891(bmr-8) into elite sorghum lines and the advanced progenies were evaluated in relation to normal sorghums. The bmr types were significantly early to flower and mature compared to normal sorghum. Normal sorghum had a significant superiority of 11 and 9% for panicle length and panicle width as compared to bmr sorghum. The bmr types recorded significantly lower grain yield than normal sorghum. However, among the bmr sorghums, CSV 15 × IS 21891 (bmr-8 mutation) derivative recorded a significant superiority over other bmr entries and was at par with the normal sorghum check CSV 20. For stover yields, normal sorghums were significantly superior to the bmr sorghums by 46%. Dry matter intake (DMI) was positively correlated with ME and IVOMD in normal sorghum. However, the correlation of DMI with IVOMD was not significant in bmr sorghums. In both the sorghums, IVOMD was positively correlated with TDN, relative feed value RFV, ME and negatively correlated with ADF and NDF. However, the association of IVOMD with NDF was non-significant in bmr sorghum. The findings of the present study indicated that bmr 3 and bmr 8 genes significantly improved the stover digestibility in specific genetic backgrounds and their interaction with recipient genetic background was evident. Source

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