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|Authors:||TASHILDAR, MOHINUDDIN BABALAL|
|Title:||EVALUATION OF TOMATO F1 HYBRIDS FOR DIESEASE RESISTANCE AND YIELD|
|Publisher:||Mahatma Phule Krishi Vidyapeeth, Rahuri-413 722 (M.S.), India.|
|Abstract:||The present investigation entitled, "Evaluation of tomato F, hybrids for disease resistance and yield" was undertaken with the objectives of elucidating information on extent of heterosis, general and specific combining ability effects and inheritance of disease resistance to leaf curl virus, Fusarium wilt and nematode. The crosses involving 3 lines and 11 testers were studied for 10 characters in Line x Tester mating design. The mean performance of hybrids was superior than mean performance of the parents for yield and yield contributing characters like yield per plant and number of fruits per plant. Considerable amount of genetic variability among the parents and appreciable amount of heterosis over better parent and superiority over top parent were observed for yield per plant and number of fruits per plant. The crosses 3 x 6, 3 x 8 and 3x9 showed high performance performance, high heterosis for yield and yield contributing characters along with low incidence of leaf curl virus. For distant market, the crosses 3 x 4, 3x7,2x9 and 2x7 were found to be stout with good pericarp thickness. Studies on combining ability indicated that none of the parents was observed as good general combiner for all the characters. The parent 85-1, COMLCR-4, COMLCR-9 and COMLCR-3 were best general combiners for yield per plant and its components. Specific combining ability studies indicated that 1 x 4, 3 x 8, 3 x 6, 1 x 9, 3 x 9 were the best specific combiners for yield per plant. These crosses deserve due consideration for their further exploitation as commercial hybrids. None of the characters showed the ratio of additive genetic variance to dominance genetic variance more than unity. Hence, they were mostly governed by predominance of dominance gene action. Considering the weight of fruits per plant and number of fruits per plant it could be suggested that parents 85-1, COMLCR-3, COMLCR-4 and COMLCR-9 were found to be good general combiner and had high heterotic response which could be exploited in future hybrid development programme. Furthermore, the cross combinations 3 x 6, 3 x 8 and 3x9 deserve due consideration for their further exploitation as commercial hybrids as they produced better yield per plant, showed significant sca effects and were found to show low incidence of leaf curl virus disease.|
|Appears in Collections:||Thesis|
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