GENETIC ANALYSIS FOR YIELD AND YIELD CONTRIBUTING TRAITS IN OKRA [Abelmoschus esculentus (L.) Moench] OVER ENVIRONMENTS
KrishiKosh
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Title |
GENETIC ANALYSIS FOR YIELD AND YIELD CONTRIBUTING TRAITS IN OKRA [Abelmoschus esculentus (L.) Moench] OVER ENVIRONMENTS
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Creator |
PATIL, SUNIL S.
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Contributor |
DESAI, D.T.
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Subject |
crop residues, livestock, organic compounds, nitrogen, inorganic compounds, animal husbandry, biological phenomena, concentrates, wheats, yields
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Description |
In the present investigation, information on the magnitude of heterosis, combining ability and its interactions with locations, G x E interactions and stability parameters was obtained for fruit yield per plant and its related components following half diallel mating design involving eight varieties/strains of okra (Abelmoschus esculentus (L.) Moench). The eight parents and their 28 F1s with one standard check were tested for twelve characters under four environments viz., summer- 2011 (E1), kharif-2011 (E2), rabi-2011-12 (E3) and summer-2012 (E4) at College Farm and R.H.R.S. Farm, Navsari Agricultural University, Navsari in a randomized block design with three replications. Abstract Significant difference existed among the parents and hybrids, indicating considerable genetic variation among these genotypes. Highly significant positive heterosis over mid parent, better parent and standard check for fruit yield and its component characters suggested that there is an ample scope of exploiting heterosis commercially and possibility of isolating desirable segregants. The cross JOL-09-8 x JOL-08-16 manifested highest heterosis over standard check with high fruit yield per plant followed by crosses JOL-09-7 x JOL-09-8 and JOL-09-7 x JOL-55-3. Heterotic effect for fruit yield per plant was found to be associated with heterosis for its related traits in majority of the crosses. Combining ability analysis revealed that both additive and non-additive variances were significant for fruit yield per plant and its related traits indicating their involvement in the expression of various traits. The magnitude of non-additive variance was higher for fruit yield per plant and its contributing traits indicating predominant role of non-additive gene action in the inheritance of the traits. Among the parents JOL-09-7, JOL-09-8 and JOL-08-16 were good general combiners for fruit yield and most of the yield components. The parents viz., JOL-09-8 and AOL-09-17 were good general combiners for earliness and tall plant stature. The cross JOL-09-7 x JOL-55-3, JOL-09-8 x JOL-08-16 and Abstract AOL-09-17 x AOL-09-13 showed sca effects of higher order for fruit yield and majority of yield components. Expression of heterosis for fruit yield and its components was related to gca effect of parents. High heterotic crosses for various characters involved at least one parent with high gca effect. A fairly close and positive association between per se performance and combining ability in both parents and hybrids was observed for almost all traits taken under study. The crosses which depicted high sca effects for fruit yield and its attributes were in general, combination of parents with good x good, good x average, good x poor, average x average, average x poor and poor x poor general combiners. Highly significant G x E interaction for majority of the traits was found which indicated differential response of genotype to varied environments. Both linear and non-linear components were found important in building up total G x E interactions. None of the parents and hybrids was found average stable for all the characters studied across environments. Non-additive effect played significant role in the inheritance of fruit yield and its components. Therefore, it is suggested that bi-parental mating system could be followed for accumulation of additive gene effect and breaking undesirable linkage in order to exploit both additive and non additive gene effects. |
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Date |
2016-05-02T10:27:22Z
2016-05-02T10:27:22Z 2013-03 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/65716
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Language |
en
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Format |
application/pdf
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Publisher |
Navsari Agricultural University, Navsari
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