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|Authors:||NAGRE, PRAKASH KSANRAO|
|Title:||GENETIC ANALYSIS OF TETRAPLOID X DIPLOID F1, HYBRIDS IN WATERMELON (Citrullus lanatus (Thunb.) Mansf.;|
|Publisher:||MAHATMA PHULE KRISHI VIDYAPEETH, RAHURI - 413 722|
|Abstract:||Investigation was carried out to elicit information on evaluation of parents and hybrids of watermelon, for extent of seedlessness, magnitude of heterosis, general and specific combining ability and nature of gene action in line x tester design involving two female parental lines viz., Tetra Black Red and Tetra Yellow Brown and eleven diploid pollen parents viz., Royal Peacock, Aligarh Selection, Sugarbaby, Khandesh Local, Sel.No. 74-321, Candy Red, Sugarball, Parmanent-2, Arka Manik, Local Green Stripe and Local Desale. The thirteen parents and their twenty two hybrids were evcxluated for two summer seasons i.e. 1992 and 1993. Observations were recorded on vine length, days for first male flower, days for first female flower, node at which first female flower appeared, sex ratio, days for maturity and first harvest, average fruit weighty, number of fruits per vine, yield per vine, size of fruit (polar and equatorial diameter), T.S.S., rind thickness, seed size (polar and equatorial diameter), number of seeds per fruit and weight of 100 seeds. The parents sel. No.74-321, TYB, TBR and Sugarbaby while the cross combinations TYB x Sel.No.74-321, TYB x Local Green Stripe, TYB x Sugarbaby, TYB x Sugarball and TBR x Sel.No.74-321 were adjudged as best parents and hybrids respectively as evident from the per se performance. Except the cross TBR x Sel.No. 74-321, all four hybrids had good quality fruits. Complete seedlessness was not obtained in any hybrid. However, the extent of seediness was reduced to a considerable extent in TYB x Local Green Stripe, TYB x Arka Manik, TYB x Royal Peacock and TYB x Aligarh selection. The analysis of variance for parents and hybrids showed that the variance due to parents, males, hybrids, female Vs male and parents Vs hybrids were highly significant for most of the characters. The analysis of variance for combining ability revealed the significant differences due to females, males, female x male interaction for almost all the characters. The interaction of genotypes with season also exhibited significance in most of the characters. Considerable heterosis over better parent was observed for all characters except polar diameter of seed over seasons and sex ratio, fruit size, fruit shape index and equatorial diameter of seed in season II. Highest desirable heterosis was observed i# low seed content by TYB x Local Green Stripe (-60.23 per cent in season II), followed by TYB Royal Peacock (-49.70 per cent in season II) and TYB x Arka Manik (-43.49 per cent in pooled mean); yield per vine by TYB x Sugarball (43.55 per cent in season II) and TYB x Sel. No. 74.321 (23.29 per cent in pooled mean), rind thickness by TBR x Royal Peacock (-37.84 per cent in season II) and average weight of fruit by TYB x Sugarball (27.26 per cent in season II) and TYB x Sel. No. 74.321 (23.00 Per cent in season I). The cross combination TYB x Sel. No. 74^321 was adjudged as the best hybrid followed by TYB x Sugarball, TYB x Sugarbaby and TYB x Local Green Stripe exhibiting high desirable heterosis for yield and quality attributes. TYB among female parents while Sel.No.74-321 followed by Sugarbaby, Sugarball were found good general combiners for more number of characters. The cross combinations TYB x Local Green Stripe, TYB x Royal Peacock, TBR x Royal peacock and TBR x Arka Manik were found good specific combiners for more number of characters. Non-additive gene action played an important role in most of the characters except rind thickness over seasons and pooled mean, number of fruits per vine in season I and pooled mean, node at which first female flower appears, sex ratio in season I, yield per vine in season II while days for maturity in pooled mean where additive gene action was predominant. Based on the present investigation it is suggested that heterosis breeding would be adopted as very effective breeding strategy|
|Appears in Collections:||Thesis|
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