1. KAUTIR (Kerala Agricultural University Theses Information and Retrieval)

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    Genetic variability, path analysis and stability parameters in sugarcane
    (Department of Plant Breeding, College of Agriculture, Vellayani, 1986) Sreekumar, S G; Gopinathan Nair, V
    Investigations on genetic variability, path analysis and stability parameters wore conducted at the Sugarcane Research Station, Thiruvalla, Sugarcane Research Centre, Chittoor and Horticultural Research Station, Ambalavayal. The analysis of data collected from 48 clones evaluated at Thiruvalla revealed that the clones showed significant differences for all the 21 characters except Juiciness at 10th month in the first ratoon crop. The germination count on the 45th day, shoot count on the 180th day, number of late shoots at harvest, number of millable canes per plot, cane yield per plot and sugar yield per plot recorded moderate to high heritabiiity in the broad sense coupled with high genetic advance both in the plant and in the first ratoon crops indicating that selection based on these characters will be effective in improving cane and sugar yields. Correlation studies revealed that cane yield per plot had significant positive genotypic correlations with germination count on the 43th day, shoot count on the 180th day, number of millable canes per plot, cane weight and length of cane both in the plant and the first ratoon crops. Therefore, improvement in any one or more of these characters will result In a simultaneous improvement in the yiold of cane. Tho quality characters such as Juiciness, brix, pol and C.C.S. percentages at 12th month had positive but non-significant correlations with cane yield In ths plant crop and the first ratoon crop, suggesting difficulty in the simultaneous improvement of cane yield and quality characters through direct selection. The number of late shoots at harvest had highly significant positive genotypic and phenotypic correlations with the yield of cane in the first ratoon crop indicating that the number of late shoots at the time of harvest can be considered as a reliable criterion for the selection of clones with good yielding ability in the ratoon crop. Sugar yield recorded significant positive gonotypic correlations with cane yield and tho components of cane yield such as germination count on the 45th day, number of millable canes per plot, cane weight and length of cane. Sugar yiola also had significant positive genotypic correlations with brix, pol and C.C.S,percentages at 12th month, Tho significant positive gonotypic correlations of sugar yield with cane yield and its important components suggests that by increasing the cane yield, sugar yield per plot can be increased.
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    Characterisation of drought tolerance in rice (Oryza sativa L.) genotypes
    (Department of Plant Breeding and Genetics, College of Horticulture, Vellanikkara, 2015) Jeevan, S; Rose Mary Francies
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    G x E interaction in the Fg generation of wide crosses of rice (Oryza sativa L.)
    (Department of Plant Breeding and Genetics, College of Horticulture, Vellanikkara, 2003) Vidhu Francis Palathingal; Kanakamany, M T
    The present study 'G x E interaction in the F6 generation of wide crosses of rice (Oryza sativa L,)' was carried out under the Department of Plant Breeding and Genetics, College of Horticulture, Kerala Agricultural University, Vellanikkara. The study was carried out for 20 characters in nine rice cultures at three locations viz., Mannuthy, Pattikkad and Adatt. The experiment estimated the variability, heritability, correlation, path coefficients and stability for the characters.High variability and heritability was noticed for most of the yield characters. The estimates of variability and heritability vaired widely between locations indicating the preponderance of the environment. Correlation and direct and indirect effects of the characters on yield also differed between the environments indicating the profound influence of location on the character. Stability analysis revealed that among the nine rice cultures studied-, culture C 26T(b) was found to be stable over locations for most of the yield traits. Culture C 26T(b) had maximum grain yield and was stable for most of the yield contributing characters like height of plant at harvest, number of productive tillers, number of spikelets per panicle, number of grains per panicle, number of days for physiological maturity, 1000 grain weight and grain yield. C 26T(b) showed superior and stable performance in the hill tracts of Pattikkad, Kole land of Adatt and at Mannuthy. Stability parameters indicated C 80 as the next stable culture. C 80 was stable for the characters total number of tillers, days to 50 per cent flowering, hulling percentage, milling percentage and amylose content.