Browsing by Author "KUSALKAR, D.V."
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ThesisItem Open Access COMBINING ABILITY AND HETEROSIS IN SWEET SORGHUM lSorghum bicolor (L.) Moench]"(MPKV,RAHURI, 2019) Aru shital Ratan; KUSALKAR, D.V.The present investigation entitled "Combining ability and heterosis in sweet sorghum [Sorghum bicolor (L.) moench]" was undertaken with view to study the general and specific combining ability of the parents and crosses respectively for cane, juice yield and its component traits in sweet sorghum and to study the heterosis for cane, juice yield and its component traits in sweet sorghum. The experimental material of combining ability analysis consisting of 64 genotypes (30 hybrids, 10 restorer lines, 3 maintainer (B) lines and one check) were laid out in randomized block design (RBD) with of three replications. It was observed that, the mean squares due to lines, testers as well as lines vs testers interaction and hybrids were found significant for all the characters under studies, except the magnitude of variance in lines and testers was found non-significant for internode per plant, in lines it is non significant for total sugar and also for magnitude of varience in lines and lines vs. testers found non significant for brix. The estimates of GCA and SCA variance found significant for all the characters under studies, however the estimates of GCA variance found non-significant for brix per cent and Reducing sugar percent. Significant variance indicated the presence of substantial amount of genetic variability among the parents and crosses for respective characters. The parents RSSV-260, RSSV-512, RSSV-509 and RSSV-498 were observed good general combiners for cane juice yield and its contributing traits. Among the lines, CMS 1409 has been observed best general combiner for juice yield and most of the its contributing traits. Out of 30 hybrids, 12 hybrids recorded significant positive sea effects, among which, cross combinations CMS-1409A x RSSV-503 (3221), ICMS-479A x RSSV-509 (1965) and ICMS-479A x RSSV-313 (1857) exhibited high sea effects for juice yield with high sea effects for juice yield contributing characters. The significant average heterosis, heterobeltiosis and standard heterosis has been observed for total biomass yield, juice yield and its contributing characters in number of crosses. The cross ICMS-479 x RSSV-260 showed the highest significant average heterosis (93.25%) and heterobeltiosis (72.60%) for juice yield. The extent of standard heterosis observed for juice yield over the check Phule Vasundhara was up to 9.41 per cent. The highest significant standard heterosis was recorded by the cross ICMS-479 x RSSV-260 (9.41%), followed by cross CMS-1409 x RSSV-260 (4.57%). Based on per se performance, GCA effects of parents, SCA effects of hybrids and heterotic perfom1ance for yield and its principal components in the F1 hybrids the cross combinations viz., ICMS-479 x RSSV-260, ICMS-479 x RSSV-260, CMS-185 x RSSV-260, CMS-1409A x RSSV-512, and CMS 185A x RSSV-512 were appeared to be the most promising. These crosses need further evaluation in preliminary or multilocations hybrid trials for further commercial exploitation.