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Search Results: 1 - 10 of 364492 matches for " N. Manivannan and P. Vindhiyavarman "
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Genetic diversity analysis of groundnut genotypes using SSR markers
D. Shoba, N. Manivannan and P.Vindhiyavarman
Electronic Journal of Plant Breeding , 2010,
Abstract: Groundnut (Arachis hypogaea L.), an important oilseed crop is a rich source of oil and protein. Molecular marker technologies are the effectivetools and they are used for the assessment of genetic variability because they are not influenced by the environment. Among the molecularmarkers, Simple Sequence Repeat (SSR) has proved to be the most powerful tool for variety identification in groundnut and has much potential ingenetic and breeding studies. Among the 17 SSR primer pairs used for assessing the genetic diversity, 6 primer pairs (24.0 per cent) werepolymorphic. The genotype TMV 2 was susceptible to rust and late leaf spot diseases and it was separately clustered in the dendrogram andamong the eleven foliar disease resistant genotypes, the genotypes viz., COG 0423, COG 0436 and COG 0432 were distantly clustered fromTMV 2. Hence, by using the genotypes viz., TMV 2, COG 0423, COG 0436 and COG 0432, three combinations viz., TMV 2 x COG 0423, TMV2 x COG 0436 and TMV 2 x C0G 0432 could be made for further studies.
Correlation study for oil yield in sunflower (Helianthus annuus L.)
Gopal Dan, N. Manivannan and P. Vindhiyavarman
Electronic Journal of Plant Breeding , 2012,
Abstract: Seventy nine inbred lines of sunflower were selected for the character association study to assess the relationship among oil yieldand its components. Observations were recorded on eight traits viz., days to 50% flowering, plant height (cm), head diameter(cm), 100-seed weight (g), volume weight per 100 ml (g), oil content (%), seed yield per plant (g) and oil yield per plant (g).Character association analysis revealed positive and significant association of oil yield per plant with seed yield per plant, plantheight, head diameter, volume weight, 100-seed weight and oil content. Hence simultaneous selection of these characters wouldcontribute for the improvement of oil yield per plant.
Studies on Variability, Heritability and Genetic Advance in Groundnut (Arachis hypogaeae L.)
Shoba D,N. Manivannan,P.Vindhiyavarman
Electronic Journal of Plant Breeding , 2009,
Abstract: Crosses were made to develop a foliar disease resistant groundnut lines with acceptable pod and kernel traits using TMV 2and three foliar disease resistant parents. Three F2 cross derivatives and their four parents were used to study their meanperformance, genetic variability, heritability and genetic advance as percentage of mean for yield and contributingcharacters. Among the crosses, TMV2 x COG0437 had higher mean performance for all the characters followed by TMV2x COG 438. Higher PCV and GCV values were also recorded by this cross. The cross TMV2 x COG0437 had highheritability and high to moderate GAM for most of characters followed by TMV2 x COG0438. Hence, based on mean andvariability parameters, TMV2 x COG437 is adjudged as best cross combination for further selection programme to evolve apromising progeny.
Stability analysis of foliar disease resistant groundnut genotypes (Arachis hypogaea L.)
A. Mothilal. P. VindhiyaVarman and N. Manivannan
Electronic Journal of Plant Breeding , 2010,
Abstract: Fifteen foliar disease resistant groundnut genotypes and one local variety (VRI 4) were evaluated over four seasons in asingle location to identify the stable high yielding genotypes. Significant G X E interaction showed the differentialperformance of genotypes over different environments / seasons. Stability analysis revealed that only one genotype(ICGV 92093) had near unity regression coefficient coupled with non-significant deviation from regression and highmean kernel yield. Hence, the genotype may be recommended over wide range of environments / seasons.
Gene effects of pod yield and its components in three crosses of groundnut (Arachis hypogaea L.)
D. Shoba, N. Manivannan and P.Vindhiyavarman
Electronic Journal of Plant Breeding , 2010,
Abstract: Groundnut, (Arachis hypogaea L.) is a major source of vegetable oil and protein and also a major source of fodder crop. Genetic systems thatcontrol the expression of quantitative traits facilitate the choice of the most efficient breeding and selection procedure. Generation mean analysis is commonlyused in studies of inheritance of quantitative traits. Four groundnut genotypes which consist of three late leaf spot and rust resistant genotypes viz., COG 0437,COG 0438 and ICGV 97150 and one susceptible genotype TMV 2 were used in the present study. The cross TMV 2 x ICGV 97150 had additivegene action for most of the traits viz., plant height, number of pods per plant, pod yield per plant, kernel yield per plant, hundred kernel weightand shelling percentage. Hence, early generation selection could be practiced in TMV 2 x ICGV 97150. However due to the presence of epistasis,especially for rust and LLS incidence in other two crosses viz., TMV 2 x COG 0437 and TMV 2 x COG 0438, selection should be postponed tolater generations.
Genetic divergence of inbred lines in sunflower (Helianthus annuus L.)
Gopal Dan, N. Manivannan and P. Vindhiyavarman
Electronic Journal of Plant Breeding , 2012,
Abstract: Genetic divergence of 79 inbred lines of sunflower using eight agronomic characters was studied. Analysis of variance revealedthe existence of divergence among the inbred lines. Mahalanobis D2 statistics indicated the presence of substantial geneticdiversity. Based on intercluster D2 value and cluster mean for various characters, potential inbred lines were identified.Intercrossing of these inbreds will exhibit more variability for yield and yield component traits. The character oil yield was foundto be important as the major contributor for genetic divergence. The usefulness of genetic divergence for the identification ofparents for heterosis breeding is not proved and needs further research.
Correlation for oil yield in sunflower (Helianthus annus.L)
T. Anandhan, N. Manivannan, P. Vindhiyavarman and P. Jeyakumar
Electronic Journal of Plant Breeding , 2010,
Abstract: Fifty five hybrids of sunflower were selected for the character association study to assess the relationship among yield and itscomponents. Observations were recorded on nine traits viz., 50% flowering, days to maturity, plant height, head diameter, 100-seed weight, volume weight, oil content, oil yield per plant and seed yield per plant. Character association analysis revealed strongpositive association of oil yield per plant with days to maturity, 100_seed weight, volume weight, oil content and seed yield perplant. Hence simultaneous selection of these characters would contribute for the improvement of the oil yield per plant.
Single marker analysis in sunflower (Helianthus annuus L.)
T. Anandhan, N. Manivannan, P. Vindhiyavarman and P. Jeyakumar
Electronic Journal of Plant Breeding , 2010,
Abstract: In sunflower marker-trait association were studied for nine yield and yield component traits using 30 SSR markers witha set of 21 CMS lines of sunflower genotypes. Association of mean performance of hybrids and gca effects of parentswith corresponding marker score were assessed single marker analysis by using simple linear regression. A total of 16markers gave significant association with at least one of the nine traits studied. Most of the markers were found to berelated to more than one trait. The markers ORS388 and ORS852 were found to be associated with three traits each.Some of the markers were found related to only one trait. It was also observed that the same marker ORS811 was foundrelated to days to 50% flowering, days to maturity, plant height, volume weight per 100 ml, oil content as well as seedyield. This indicates that the same gene is controlling the expression of these characters. Moreover, phenotypically thesecharacters have more association with each other. Hence these markers may be useful for marker assisted breedingprogramme.
Genetic divergence study in sunflower (Helianthus annuus L.)
B.Punitha, P.Vindhiyavarman and N.Manivannan
Electronic Journal of Plant Breeding , 2010,
Abstract: An investigation about the genetical diversity among 17 sunflower genotypes using nine agronomic characters was studied atthe Department of Oilseeds, Tamil Nadu Agricultural University, Coimbatore. Univariate and multivariate analysis ofvariance revealed the presence of significant among the genotypes. Mahalanobis D2 statistics indicated the presence ofsubstantial genetic diversity. The genotypes were grouped into four clusters. Based on the intercluster distance cluster meanfor various characters, potential lines were identified from clusters I and III for crossing programme. Among theinvestigated characters, the seed yield, plant height, oil content and oil yield exhibited high contribution towards geneticdivergence. The present study indicates that the inclusion of CSFI 5076, CSFI 5162, CMS 47A, CSFI 5005, CMS 17A, CMS47A, CSFI 5069, CSFI 5422, CSFI 5109, CSFI 5155, CSFI 5002, COSF 1A , CSFI 5161 and CSFI 5015 in future breedingprograms could result in the development of superior sunflower cultivars.
New male sterile lines in sunflower
N.Manivannan*, T. Anandan, R. Chandirakala, P. Vindhiyavarman, V. Muralidharan and K.Ganesamurthy
Electronic Journal of Plant Breeding , 2011,
Abstract: Two sunflower inbreds viz., TNHSF 239 and 852 B were selected for high oil content and vigour respectively. These inbreds were convertedinto cytoplasmic genic male sterile (cms) lines using two cms lines viz., 17 A and 234 A (PET 1 source of cytoplasm). A total of 30 cms lineswere developed through back cross. These newly converted cms lines were tested for their heterotic potential for oil yield, seed yield, oil contentand other yield components. Among these converted cms lines, four lines performed superior for oil yield and its component traits. These cmslines were designated as COSF 2A, 3A, 4A and COSF 5 A and recommended for utilization in heterosis breeding programme.
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