ESTIMATION OF HETEROSIS, INBREEDING DEPRESSION AND GENETIC PARAMETERS IN F2 GENERATION INVOLVING AROMATIC RICE (Oryza sativa L.) GENOTYPES.
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Title |
ESTIMATION OF HETEROSIS, INBREEDING DEPRESSION AND GENETIC PARAMETERS IN F2 GENERATION INVOLVING AROMATIC RICE (Oryza sativa L.) GENOTYPES.
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Creator |
RAJENDAR REDDY, M
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Contributor |
SURENDER RAJU, CH
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Subject |
yields, planting, grain, rice, developmental stages, heterosis, genetics, crossing over, biological phenomena, genotypes
HETEROSIS, INBREEDING DEPRESSION, GENETIC, F2 GENERATION, AROMATIC RICE, Oryza sativa L., GENOTYPES. |
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Description |
A field experiment was conducted during kharif, 2010 at Rice section, ARI, Rajendra nagar, involving 7 parents, 7 F1 hybrids and their corresponding F2 populations to study the heterosis, inbreeding depression, variability, heritability and genetic advance cross-wise and also the correlations, direct and indirect effects of yield components in aromatic rice. The study indicated the presence of sufficient variability in the material evaluated. High amount of heterosis was recorded over better parent for days to 50% flowering, number of productive tillers per plant and grain yield per plant. Whereas, heterosis only on mid-parent was noticed incase of number of grains per panicle, 1000- grain weight and kernel length. Heterotic effects were seen in the hybrids which were developed from the parents having poor per se performance in most of the cases. High heterosis for grain yield was accompanied by high inbreeding depression which indicated the predominant role of non-additive gene effects. A critical examination of genetic parameters in each cross in F2 generation revealed the presence of wider range of variability for both yield and quality traits. The estimates of heritability and genetic advance varied depending on the cross and also the character. Estimates of heritability in broad sense and genetic advance were high for number of grains per panicle, grain yield per plant and kernel length. Whereas, the estimates were relatively low-moderate for the remaining characters. Keeping in view the gene action known from the genetic parameters and also the correlations and path coefficients, selection on important yield components viz., number of productive tillers per plant, panicle length and 1000-grain weight and the quality trait, kernel length was suggested to bring out further improvement in aromatic rice. The crosses, YANINI × MTU 1010 for days to 50 % flowering, PUSA 1121 × MTU 1010 and RNR 2354 × MTU 1081 for number of productive tillers per plant, RNR 2354 × Sye 632002 and YAMINI × BM 71 for number of grains per panicle, PUSA 1121 X MTU 1010 for grain yield per plant, PUSA 1121 × BM 71 and PUSA 1121× MTU 1010 for kernel length were identified as better crosses for further advancement to develop pure lines with high yield and quality. |
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Date |
2016-06-07T12:46:28Z
2016-06-07T12:46:28Z 2011 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/66921
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Language |
en
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Relation |
;D9239
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Format |
application/pdf
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Publisher |
ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY
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