National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Standard heterosis over two checks was studied in 30 crosses of tomato. Degree and direction of heterosis is important for commercially exploitation of tomato. All these crosses showed marked variations for yield and yield related traits in the expression of standard heterosis. Standard heterosis for total yield per plant was found to be 62.46 per cent over first check (SH1) and 30.84 per cent over second check (SH2). Highest heterotic effects for yield traits over SH1 was observed for number of seeds per fruit followed by plant height, number of fruits per cluster, number of fruits per plant and fruit diameter while the traits showing highest heterotic effects over SH2 were fruit diameter followed by plant height, number of seeds per fruit, number of fruits per plant and number of primary branches per plant. The maximum significant positive heterosis for total yield per plant was estimated for the cross Azad T-5 × DT-2 with 62.46 over SH1 and 30.84 over SH2 followed by Sel-7 × DT-2 with 56.08 over SH1 and 25.7 over SH2 and then the cross Punjab Upma × DT-2 with 50.76 over SH1 and 21.42 over SH2. In F2 progenies inbreeding depression was also studied for 16 characters of 30 hybrids. In many crosses significant inbreeding depressions were found for the studied characters. In most of the crosses high heterosis for total yield per plant and its related traits was invariably accompanied by high inbreeding depression in F2 generation. To develop high yielding tomato hybrids the most important criteria is the selection of good parents.
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