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Author: search.filters.author.Achamma Oommen

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    Studies on the f2 generation of inter-varietal crosses in rice
    (Kerala Agricultural University, 1983) Achamma Oommen; Abraham, A T
    In the study of the Fa generation of the cross of two improved dryland strains and a locai medicinal variety of rice with two high yielding varieties revealed that all the characters under observation were inherited polygenically. F2 segregants surpassing the higher parental limit in their mean yield were obtained. No significant correlation was observed between yield and plant height, number of tillers, panicle length and 1000 grain weight.
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    Genetic analysis of some quantitative characters in pigeonpea
    (Kerala Agricultural University, 1994) Achamma Oommen; Namboodiri, K M N; Unnithan, V K G
    Out of the eleven quantitative characters studied in pigeonpea, days to flowering alone was influenced by non-additive genes and all the remaining characters by additive genes. The proportion of dominant and recessive genes was equal for plant height and number of clusters per plant, whereas more than one recessive gene was present for eveiy dominant gene in the expression of days to maturity. The remaining eight characters showed the presence of one to two dominant genes for every recessive gene.
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    Concept of ideal plant type (ideotype) in horsegram (Dolichos Biflorus L.)
    (Kerala Agricultural University, 1995) Swapna, M; Achamma Oommen; Namboodiri, K M N; Luckins C Babu
    The concept of an ideal plant type in horsegram was studied based on crop growth rate (CGR), net assimilation rate (NAR), leaf area index (LAI) and harvest index (HI). A plant type with peak CGR, NAR and LAI at the middle growth period was found to be the best. Efficient partitioning of the total dry matter produced towards the reproductive parts was very important for a higher harvest index.
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    Chlorophyll content as an index for selection in Rauwolfia spp.
    (Kerala Agricultural University, 1996) Narayanan, A K; Luckins C Babu; Namboodiri, K M N; Achamma Oommen; Augustine, A
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    Combining ability in pigeonpea (Cajanus cajan [L.] millsp)
    (Kerala Agricultural University, 1996) Achamma Oommen; Namboodiri, K M N; Vijayakumar, N K
    Even though both additive and nonadditive gene effects were found to be important in the expression of the characters studied, the additive gene effects were having more influence than nonadditive gene effects. Number of primary branches was determined by additive and nonadditive genes, whereas number of secondary branches was influenced by additive genes. All the other nine characters were determined by additive genes. Among the five parents studied, PLA 550 was the best general combiner and among the crosses UPAS 120 x 1C 15708 was having good sea for all the characters.
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    Genetic analysis of yield and yield components in pigeonpea (Cajanus Cajan (L.) Mill sp.
    (Kerala Agricultural University, 1999) Achamma Oommen; Namboodiri, K M N; Unnithan, V K G
    Generation mean analysis carried out in pigeonpea to estimate gene effects revealed that, yield and yield components AK under all the three types of gene action. v\/.-, additive, dominance and epistasis. Hence reciprocal recurrent selection seems to be the best suited method of breeding for improvement of this crop.