Browsing by Author "Namboodiri, K M N"

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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
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.
Comparative performance of f1 and parents in intervarietal crosses of rice
(Kerala Agricultural University, 1977) Sreekumari Amma, J; Namboodiri, K M N; Mary K George
The behaviour of six characters on direct and reciprocal hybrids of two intervarietal crosses in rice was studied along with their parents and the following conclusions were drawn. There was a clear evidence of positive heterosis in plant height. The hybrids showed increase in plant height over the two parents. All the hybrids are significantly superior to both of the parents with respect to the total number of tillers produced. With regard to the number of nodes the hybrids did not show any significant difference over the parents. In the area of flag leaf the hybrids between Dee-Geo-Woo-Gen x Annapurna manifested positive heterosis while the reciprocal hybrids showed little heterosis. As regards the area of second leaf from the tip both the hybrids were not superior over the parents. But for the character of second leaf angle the hybrids were superior to their parents with reduced leaf angle. In general hybrids were better than the parents with respect to plant height, number of tillers, area of flag leaf and leaf angle.
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.
Genetic analysis of seed dormancy and productivity in groundnut (Arachis hypogaea L.)
(Department of Plant Breeding and Genetics, College of Horticulture, Vellanikkara, 1997) Tessy Joseph; Namboodiri, K M N
Investigations on genetic analysis of seed dormancy and productivity in groundnut (Arachis hypogaea L.) were carried out in the Department of Plant Breeding and Genetics, College of Horticulture, Vellanikkara from 1992-95. The objective of the study was to find out the gene effects of biometric traits and seed dormancy in groundnut, so as to suggest appropriate breeding methodology and parental combinations to evolve domant, high yielding and early manuring varieties. The findings of the study are briefed below. Evaluation of 28 genotypes (14 domant and 14 non domant) for two seasons revealed that wide range of variability existed among them. Donors for specific traits were identified . The genotypes were also genetically diverse and could be grouped into four clusters. The line x tester analysis with three lines and five testers revealed that additive gene effects governed most of the characters except pod yield and number of mature pods , for which , non addictive gene effects were important. To harness both the types of gene effects pedigree method followed by selection in advanced generations will be fruitful.
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.
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.
Heterosis in black pepper (Piper nigrum L.)
(Kerala Agricultural University, 1995) Sujatha, R; Namboodiri, K M N
A study was conducted to estimate heterosis in F, hybrids of black pepper with respect to yield and three reproductive characters using 45 hybrids belonging to eight different intervarietaJ combinations of crosses planted at the Pepper Research Station, Panniyur. One of the hybrids, viz. Culture 4968 belonging to the cross Uthirenkotta x Balankotta was found to exhibit high heterosis with respect to all the characters. Promising parental combinations were, Uthirenkotta x Cheriyakaniakkadan and Karivilanchy x Cheriyakaniakkadan. The combinations Uthirenkotta x Kottanadan, Uthirenkotta x Kuthiravaly and Panniyur 1 x Karimunda were found least promising.
Induction of genetic variability in kacholam(Kaempferia Galanga L.)
(Department of Plant Breeding and Genetics, College of Horticulture, Vellanikkara, 1997) Kanakamany, M T; Namboodiri, K M N
Influence of plant characters on yield in black pepper (Piper nigrum L.)
(Kerala Agricultural University, 1995) Sujatha, R; Namboodiri, K M N
Data on 580 genotypes of black pepper were .utilised to estimate the correlations among yield and 20 quantitative characters. The results revealed that the reproductive characters viz., green spike yield per vine, green berry yield per vine, number of spikes per vine and number of under-developed berries per spike as well as the vegetative characters, thickness of node and intemode of orthotrope and angle of insertion of plageotrope are positively and significantly correlated with yield. The inter-correlations among these characters were also positive and significant. Path analysis revealed positive direct effect on yield by the characters green berry yield, spike number, spike length and angle of insertion of plageotrope. The effect of the remaining characters on yield were due to their indirect influence through other component characters.
Inheritance of phenol reaction in rice
(Kerala Agricultural University, 1971) Rajendran, P G; Narayanan Unnithan, D; Namboodiri, K M N
Inheritance of plant height and flowering duration in four rice crosses
(Kerala Agricultural University, 1971) Rajendran, P G; Namboodiri, K M N
Inheritance studies on the F2 generation of intervarietal crosses in rice
(Division of Agricultural Botany, Agricultural college & research institute , Vellayani Trivandrum, 1970) Abdurahiman, P V; Namboodiri, K M N
Performance of sugarcane varieties in Kerala
(Kerala Agricultural University, 1982) Nair, P K C; Sukumaran Nair, S; Namboodiri, K M N
With a view to evolving cane varieties superior to the local promising ones under cultivation in the river bank areas of Kerala, a varietal trial with 12 varieties was conducted at the Sugarcane Research Station, Thiru valla during the year 1977-79. Co. 62175 excelled all other varieties in germination in the plant crop, but not in the ratoon crops. Co. 997 is found to be better than other varieties in number of mi liable canes. But this number has contributed for yield. Co, 62175 is the highest yielder among the twelve varieties studied. The increase in yield over the most popular variety Co. 997 is 45. 4%, 22%, 32.4% for the plant crop, first ratoon, second ratoon respectively. The mean percentage increase over all the seasons is 37.6%. The increase in cane yield of this variety is due to the increased length and girth of canes. There is no significant difference in Brix, Pol and purity between the varieties. Co. 62175 can be recommended for commercial cultivation on the river banks of Kerala.
Sterility of inter-racial and intra-rac1al f2 hybrids of rice
(Kerala Agricultural University, 1972) Rajendran, P E; Namboodiri, K M N
Studies on inter-racial and intra-racial F2 hybrids of Oryza sativa Linn.
(Division of Agricultural Botany, Agricultural College and Research Institute, Vellayani, 1968) Rajendran, P G; Namboodiri, K M N
A study on the F2 generation of inter-racial, (Vellayani-1 x Tainan-3) and intra-racial (Vellayani-1 x Taichung Native-1) rice hybrids of both direct and reciprocal combinations of crosses, with reference to the mode of inheritance of 15 plant characters , has been conducted during October to January 1968. Based on the results the following conclusions have been drawn. In both inter -racial and intra - racial hybrids , plant height, number of productive as well as non-productive tillers, flowering duration, exsertion and length of panicle, grain and straw yields, length , breadthand thickness of grains are inherited as quantitative characters controlled either by multiple genes or by one or two major genes and a few minor genes . No reciprocal difference in either of the two racial groups, is observed. Transgressive segregation is seen in all cases.