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Researcher Choudhary, Kuldeep
Advisor Dubey, R. B.
Source KrishiKosh-Indian National Agricultural Research System
Content type Text
Educational Degree Master of Science (M.Sc.)
Publisher MPUAT
File Format PDF
Language English
Subject Domain (in DDC) Technology ♦ Agriculture & related technologies ♦ Techniques, equipment & materials
Subject Keyword Heterosis ♦ Combining ♦ Ability ♦ Late Maturing ♦ Qpm ♦ Hybrids ♦ (zea Mays ♦ Heterosis and Combining Ability In Late Maturing Qpm Hybrids In Maize (zea Mays L.) ♦ Plant Breeding
Abstract The present investigation consisted of 45 hybrids along with 18 parents and 4 checks viz., Pratap QPM Hybrid-1, HQPM-7, HQPM-1 and PMH-4, a total of 67 entries were evaluated during Kharif 2013 in randomized block design with three replications. The data was recorded on fourteen traits to study the magnitude of mid parent heterosis (MP), heterobeltiosis (BP), economic heterosis (SC), general and specific combining ability effects. The analysis of variance revealed that the mean squares due to genotypes, parents, crosses and parents v/s crosses were significant for all the traits, except for days to 50 per cent tasseling, days to 50 per cent silking and days to 75 per cent brown husk. The per se performance indicated that the inbred line L8 exhibited maximum mean values for grain yield per plant, ear length and oil content. Another inbred line L9 exhibited minimum mean values of days to 50 per cent tasseling, days to 50 per cent silking, days to 75 per cent brown husk and plant height. The inbred line L13 depicted highest mean value for harvest index and tryptophan content, inbred line L10 for starch content whereas, inbred line L5 for lysine content. Among the hybrids, L6 x T2 showed maximum mean values for harvest index and protein content. Hybrid L7 x T2 exhibited minimum mean values for days to 50 per cent tasseling and days to 50 per cent silking. The hybrids L3 x T3 and L5 x T3 exhibited maximum mean values for oil content. The hybrid L10 x T3 exhibited maximum mean value for tryptophan content whereas, hybrid L7 x T3 exhibited maximum mean values for lysine content. Three hybrids L7 x T2, L10 x T3 and L7 x T3 depicted positive significant economic heterosis for grain yield per plant over the best check HQPM-1. The hybrid L6 x T2 exhibited maximum positive significant economic heterosis for protein content over the best check HQPM-7. Three hybrids namely L10 x T3, L13 x T1 and L5 x T1 exhibited positive significant economic heterosis for tryptophan content over the best check Pratap QPM Hybrid-1 while only one hybrid L7 x T3 showed positive significant economic heterosis for lysine content over the best check HQPM-7. Heterobeltiosis for grain yield per plant was exhibited by twenty three hybrids with maximum heterobeltiosis depicted by the hybrid L10 x T3. Majority of the hybrids exhibited significant negative relative heterosis for maturity traits and plant type traits indicated that for these traits the genes with negative effects were dominant. On the other hand for yield and yield contributing traits as well as quality traits, most of the hybrids exhibited positive significant relative heterosis, thereby indicating that for these traits the genes with positive effects were dominant. The analysis of variance for combining ability indicated that mean square due to crosses, lines and testers were significant for all the traits except for days to 50 per cent tasseling, days to 50 per cent silking and days to 75 per cent brown husk. The ratio of ï ³ 2 sca / ï ³ 2 gca was greater than one for all the traits except days to 50 per cent tasseling and days to 75 per cent brown husk, thereby indicating the preponderance of non-additive gene effects in the expression of these traits. Inbred line L6 has been found good general combiner for majority of traits viz., plant height, ear height, 100- grain weight, grain yield per plant, harvest index, protein content, oil content, tryptophan content and lysine content. Hybrid L7 x T2 showed highest positive significant sca effects along good per se performance and positive significant economic heterosis for grain yield per plant. The hybrid L10 x T3 showed highest significant sca effects, good economic heterosis and per se performance for tryptophan content along with good per se performance for grain yield per plant. Thus a close association between sca effects, economic heterosis and per se performance for grain yield per plant, oil content, starch content, protein content, tryptophan content and lysine content was observed among the best hybrids identified on the basis of sca effect.
Educational Use Research
Education Level UG and PG
Learning Resource Type Thesis
Publisher Place Udaipur
Size (in Bytes) 707.07 kB
Page Count 123