Thumbnail Image

Master Degree Theses

Browse

2001 - 20052
 Reset filters

Settings

Author: Bagade, Ashish Bhaurao ×

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    ThesisItemOpen Access
    Heterosis and Combining Ability in Indian Bean (Doliahos Lablab L.)
    (Agricultural Botany Department, N. M. College of Agriculture Gujarat Agricultural University, 2001-09) Bagade, Ashish Bhaurao; Patel, D. U.
  • Thumbnail Image
    ThesisItemOpen Access
    Genetic Evaluation of CMS Based and Conventional Hybrids in Cotton (Gossypium hirsutum L.)
    (Agricultural Botany Department, N. M. College of Agriculture Gujarat Agricultural University, 2005-12) Bagade, Ashish Bhaurao; Vashi, P. S
    In cotton, the hybrid seed is produced by the conventional system of hand emasculation and pollination , which renders the cost of hybrid seeds expensive. Another disadvantage in this method is the low recovery of seed set ranging from 7 to 35 per cent particularly in the case of interspecific hybrids . On the contrary, a better seed set is achieved in the hybrids which are developed using cytoplasmic male sterility, as mechanical injury of the ovary during hand emasculation is avoided resulting in cheaper hybrid seed producti on (Davis, 1978). In the present study, manifestation of heterosis, combining ability and stability parameters were studied in eMS based hybrids to explore the possibilities to develop CMS based intra hirsutull1 hybrid for cOlllmercial cultivation. The experimental material consisted of two cytoplasmic male sterile lines, eight restorers and their sixteen resultant hybrids of each method (CMS Aridum, eMS Harknessii and conventional) wer·e tested for· 12 characters including seed cotton yield at three locations in randomized block design replicated thrice during kharif2004. Significant differences were observed among parents and hybrids which revealed considerable genetic variation in the material. Heterosis to the extent of 38.02 and 29.13 per cent was observed for seed cotton yield in CMS Aridum and CMS Harknessi i system as against 53.61 per cent in conventional system indicating good scope of exploiting heterosis commercially using CMS lines. Crosses PH 93 x G cot 10, PH 93 x Surat dwarf and LRK 516 x Line 203 were the most heterotic and high yielding hybrids in all the three methods. Combining ability analysis revealed involvement of both additive and non-additive gene effects in the inheritance of all the traits, however, non-additive gene action was preponderant. Parents LRK 516, G cot 10, Surat dwarf and Line 203 were found to be good general combiners for seed cotton yield and some of the related traits. Per se performance of parents showed close association with their gca effects while no such relation was observed between sca effects of hybrids and their per se performance. Cross combination LRK 516 x DS-70-480 exhibited significant high positive sca effect for seed cotton yield in all the three methods. Stability analysis revealed the presence of significant genetic variability in the material for all the characters. Significant mean square values due to environment for monopodia per plant, sympodia per plant and seed cotton yield in all the three systems suggested that genotypes interacted considerably with the varying environments and major portion of the interaction was accounted for by the linear component in respect of these traits. Significance of G x E (linear) when tested against pooled • error indicated possibilities of prediction of seed cotton yield performance of the genotypes over the environments. G cot 10 was found to be the most stable parent while PH 93 x G cot 10 was average stable hybrid for seed cotton yield . Use of biparental progeny selection to isolate desirable transgressive segregants is suggested while recurrent selection approach would be effective in order to exploit both additive and non-additive gene effects.