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Researcher S. H. BHANDERI
Advisor Dangaria, C. J.
Source KrishiKosh-Indian National Agricultural Research System
Content type Text
Educational Degree Master of Science (M.Sc.)
Publisher JAU
File Format PDF
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Plants (Botany)
Subject Keyword Botany ♦ Genetic Studies In Pearl Millet [pennisetum Glaucum (l.)]
Abstract Information regarding heterosis and combining ability in respect of grain yield and yield components was obtained in the present investigation. The material for present study comprised of 8 diverse parents (inbreds) and their twenty-eight hybrids. They were evaluated in the randomized block design, replicated three times at Instructional farm, College of Agriculture, Junagadh Agricultural University, Junagadh during kharif-2005. Observations were recorded on days to flowering, days to maturity, no. of nodes, plant height (cm), effective tiller per plant, ear head length (cm), ear head girth (cm), ear head weight (g), dry fodder yield per plant (g), grain yield per plant (g), test weight (g),harvest index and, threshing index. The data were analysed to estimate heterosis and combining ability for these traits. The analysis of variance revealed significant differences among genotypes, parents and hybrids for all the characters. Parent Vs hybrids for all the characters except number of nodes. The results revealed presence of considerable genetic variability in the material studied. High magnitude of parents Vs hybrids mean square (except number of nodes) indicated presence of conspicuous mean heterosis. The magnitude of heterosis varied from cross to cross for all the characters. Plant height and grain yield per plant exhibited the highest heterotic values, whereas, least heterosis was observed for no. of nodes. Heterosis in grain yield was reflected through heterosis in Ear head weight, ear head length, 1000-grain weight, ear head weight and dry fodder yield per plant threshing index harvest index. The crosses J-2420 x J-2480, J-2340 x J-2440 and J-2441 x J-2480 exhibited the highest heterotic effect and mean performance for grain yield. The combining ability analysis showed that general as well as specific combining ability variances were significant for all the characters. The GCA: SCA variance ratio indicated preponderance of additive genetic variance for plant height, ear head length, ear head girth and test weight, where as non- additive genetic variance for days to maturity, days to flowering, effective tillers per plant, dry fodder weight, grain yield per plant, harvest index, as well as ear head weight, number of nodes, threshing index, while were equally important for both type of genetic variance. The hybrids, J-2420 x J-2480, J-2340 x J-2440, J-2440 x J-2420 and J-2340 x J-2454 were the promising ones on the basis of SCA effect, per se performance, and heterosis, which could be exploited for improvement in grain yield and its components. The parents like J-2420, J-2340, and J-2441, J-2440 could be used in hybridization programme to exploit their GCA effects for grain yield and some other important contributing traits. The hybrids viz., J-2440 x J-2420, J-2340 x J-2440, J-2441 x J-2420, J-2340 x J-2420 and J-2340 x J-2441 displayed high per se performance, high estimates of heterobeltiosis, high SCA (except J-2441 x J-2420, J-2340 x J-2420) and involved both the parents with high GCA effects. Such crosses have potential to throw desirable transegresants in the segregating material, which the breeder can handle through pedigree method for the development of high yielding inbred lines.
Educational Use Research
Education Level UG and PG
Learning Resource Type Thesis
Publisher Place Junagadh
Size (in Bytes) 123.84 MB
Page Count 136