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Not AvailableGenetic 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.Not Availabl

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Not AvailableForty seven sweet sorghum genotypes were evaluated for resistance to stem borer during kharif 2007 - 2009. Principal component analysis (PCA) was performed considering five parameters viz., dead-hearts, stem, peduncle tunneling, exit holes/stalk, number of larvae/ stalk. Two principal components (PCs) were extracted explaining a cumulative variation of 71.5 %. PC1 explained 47.7 % of the variation while PC2 explained 23.7 % of variation. PC1 had the loadings for dead-hearts (0.85), stem tunneling (0.73), exit holes/ stalk (0.87) whereas peduncle tunneling (0.82) and larvae/ stalk (0.81) were loaded in PC2 . PCA brought out three characters/variables viz. dead-hearts, stem tunneling and exit holes/ stalk, as most important in explaining variability thus, aiding in deciding reaction to pest. Eleven genotypes viz., E 27, IS 18162, IS 18164, E 38, ICSV 700, ICSV 93046, NSSV 6, GGUB 50, IS 5353, KARS 95 and RSSV 9 were found resistant to stem borer, Chilo partellusNot Availabl

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Not AvailableSweet sorghum can be grown under dryland conditions with annual rainfall ranging from 550-750 mm. The best areas to produce this crop are Central and South India, subtropical areas of Uttar Pradesh and Uttaranchal. It can be grown on well-drained soils such as silt loam or sandy silt clay loam soils with a depth of 0.75 m. Atmospheric temperatures suitable for sweet sorghum growth vary between 15 and 37°C. Sorghum being a C4 species is adapted to a wide range of environments with latitudes ranging from 40oN to 40oS of the equator. Sorghum in general has relatively a deep root system (>1.5 m), and has the unique feature of being ‘dormant’ under unfavorable conditions and resume growth once environmental conditions are favorableNot Availabl

General and specific combining ability in sweet sorghum.

In breeding of sweet sorghum hybrids, non-additive genetic effects are important in phenotypic expression of the traits of interest. The aim of this study was to evaluate the general combining ability (GCA) of sweet sorghum lines and the specific combining ability (SCA) of the hybrids for agronomic and technological traits. Five fertility restorer lines, four male-sterile lines, and their hybrids from partial diallel crosses were evaluated in experiments laid out in a 5 x 6 triple rectangular lattice design in the municipalities of Lavras, MG and Sete Lagoas, MG, Brazil. Diallel analysis was performed using the Griffing model adapted to partial diallel crosses. There was a significant effect of GCA and SCA for most of the traits evaluated, indicating the participation of additive or dominant genes in inheritance. The restorer lines CMSX508, BRS 511, CMSXS643, and CMSXS646 show potential for use as parents in sorghum breeding programs