Rajeswari Sivakami | Tamil Nadu Agricultural University (original) (raw)

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Papers by Rajeswari Sivakami

Agricultural Science Digest – A Research Journal, Nov 30, 2017

<jats:p>Nine rice genotypes were evaluated for this present study. Genetic variability para... more <jats:p>Nine rice genotypes were evaluated for this present study. Genetic variability parameters, correlation and path coefficient analysis were estimated for eleven agronomic and quality traits. Among all the genotypes, ASD 16 recorded highest significant grain yield per plant. In this present study, the PCV was higher than GCV for all the characters studied. The grain yield per plant recorded highest GCV, high heritability coupled with high genetic advance which indicates that the trait were governed by epistasis and dominant gene action. Number of productive tillers per plant and thousand grain weight showed positive significant correlation and direct effects on grain yield per plant. The purpose of this study is to estimate the amount of variability present in this material, which in turn helps to select these material for further breeding programme to develop high yield hybrids combine with blast and leaf folder resistance.</jats:p>

Background Knowledge of genetic diversity is the prerequisite to choose the parents for heterosis... more Background Knowledge of genetic diversity is the prerequisite to choose the parents for heterosis breeding aimed at the improvement of any trait in cotton as hybridization among the accessions belonging to diverse genetic background exhibited desirable recombinants in segregating generation. Understanding the genetic behaviour of lint and fuzz formation in cotton is crucial for improving cotton production and developing new cotton varieties with desired traits. Result The current study was intended to evaluate the genetic diversity among different fuzzy and fuzzless genotypes and to understand the gene action and combining ability of seed cotton yield and yield contributing characters along with fibre quality. Principal component analysis revealed that the first four principal component analyses (PCs) out of the total eleven PCs exhibited higher eigen values (> 1) and had maximum contribution to total variability (89.46%). The attributes that had maximum share to total divergence...

Indian Journal of Agricultural Research, Volume 57 Issue 2: 143-149 (April 2023)

Background: Gossypium hirsutum, the most widely cultivated crop in the world has concurrent impor... more Background: Gossypium hirsutum, the most widely cultivated crop in the world has concurrent importance for both fibre quality and yield. Polygenes regulate cotton output and a variety of factors affect the characteristic. As a result, it is essential to have thorough knowledge of the relationships between different component traits and fibre quality. Thus, the aim of the study was framed to know about the correlation along with cause-and-effect relationship among the economic traits. Mathods: Eight parents and 56 hybrids made up the experimental sample for our study, which were evaluated for 18 economically significant traits. The study was conducted at

Indian Journal Of Agricultural Research

Background: Gossypium hirsutum, the most widely cultivated crop in the world has concurrent impor... more Background: Gossypium hirsutum, the most widely cultivated crop in the world has concurrent importance for both fibre quality and yield. Polygenes regulate cotton output and a variety of factors affect the characteristic. As a result, it is essential to have thorough knowledge of the relationships between different component traits and fibre quality. Thus, the aim of the study was framed to know about the correlation along with cause-and-effect relationship among the economic traits. Mathod: Eight parents and 56 hybrids made up the experimental sample for our study, which were evaluated for 18 economically significant traits. The study was conducted at Department of Cotton, Tamil Nadu Agricultural University, Coimbatore, in 2021-2022. Results: Analysis of variance was highly significant for all the traits studied. The result of correlation revealed that the traits viz., number of bolls per plant, boll weight, number of seeds per boll, upper half mean length and fibre strength had a ...

Allele matrix of 192 accessions x 61 SSRs. (XLSX 10 kb)

Expected product size obtained from Gramene and observed product size for the SSR markers used in... more Expected product size obtained from Gramene and observed product size for the SSR markers used in this study. (XLS 170 kb)

Background: Genetic diversity is the main source of variability in any crop improvement program. ... more Background: Genetic diversity is the main source of variability in any crop improvement program. It serves as a reservoir for identifying superior alleles controlling key agronomic and quality traits through allele mining/ association mapping. Association mapping based on LD (Linkage dis-equilibrium), non-random associations between causative loci and phenotype in natural population is highly useful in dissecting out genetic basis of complex traits. For any successful association mapping program, understanding the population structure and assessing the kinship relatedness is essential before making correlation between superior alleles and traits. The present study was aimed at evaluating the genetic variation and population structure in a collection of 192 rice germplasm lines including local landraces, improved varieties and exotic lines from diverse origin. Results: A set of 192 diverse rice germplasm lines were genotyped using 61 genome wide SSR markers to assess the molecular ge...

Agricultural Science Digest – A Research Journal, 2017

Nine rice genotypes were evaluated for this present study. Genetic variability parameters, correl... more Nine rice genotypes were evaluated for this present study. Genetic variability parameters, correlation and path coefficient analysis were estimated for eleven agronomic and quality traits. Among all the genotypes, ASD 16 recorded highest significant grain yield per plant. In this present study, the PCV was higher than GCV for all the characters studied. The grain yield per plant recorded highest GCV, high heritability coupled with high genetic advance which indicates that the trait were governed by epistasis and dominant gene action. Number of productive tillers per plant and thousand grain weight showed positive significant correlation and direct effects on grain yield per plant. The purpose of this study is to estimate the amount of variability present in this material, which in turn helps to select these material for further breeding programme to develop high yield hybrids combine with blast and leaf folder resistance.

Allelic pattern of different SSR markers used in this study. (JPG 1.03 MB)

Rice (New York, N.Y.), 2015

Genetic diversity is the main source of variability in any crop improvement program. It serves as... more Genetic diversity is the main source of variability in any crop improvement program. It serves as a reservoir for identifying superior alleles controlling key agronomic and quality traits through allele mining/association mapping. Association mapping based on LD (Linkage dis-equilibrium), non-random associations between causative loci and phenotype in natural population is highly useful in dissecting out genetic basis of complex traits. For any successful association mapping program, understanding the population structure and assessing the kinship relatedness is essential before making correlation between superior alleles and traits. The present study was aimed at evaluating the genetic variation and population structure in a collection of 192 rice germplasm lines including local landraces, improved varieties and exotic lines from diverse origin. A set of 192 diverse rice germplasm lines were genotyped using 61 genome wide SSR markers to assess the molecular genetic diversity and ge...

Cereal Chemistry, 2009

Cereal Chem. 86(5):492-498 Amylose content is a parameter that correlates with the cooking behav-... more Cereal Chem. 86(5):492-498 Amylose content is a parameter that correlates with the cooking behav- ior of rice. It is measured at the earliest possible stages of rice improve- ment programs to enable breeders to build the foundations of appropriate grain quality during cultivar development. Amylose is usually quantified by absorbance of the amylose-iodine complex. The International Network for Quality Rice

Agricultural Science Digest – A Research Journal, Nov 30, 2017

<jats:p>Nine rice genotypes were evaluated for this present study. Genetic variability para... more <jats:p>Nine rice genotypes were evaluated for this present study. Genetic variability parameters, correlation and path coefficient analysis were estimated for eleven agronomic and quality traits. Among all the genotypes, ASD 16 recorded highest significant grain yield per plant. In this present study, the PCV was higher than GCV for all the characters studied. The grain yield per plant recorded highest GCV, high heritability coupled with high genetic advance which indicates that the trait were governed by epistasis and dominant gene action. Number of productive tillers per plant and thousand grain weight showed positive significant correlation and direct effects on grain yield per plant. The purpose of this study is to estimate the amount of variability present in this material, which in turn helps to select these material for further breeding programme to develop high yield hybrids combine with blast and leaf folder resistance.</jats:p>

Background Knowledge of genetic diversity is the prerequisite to choose the parents for heterosis... more Background Knowledge of genetic diversity is the prerequisite to choose the parents for heterosis breeding aimed at the improvement of any trait in cotton as hybridization among the accessions belonging to diverse genetic background exhibited desirable recombinants in segregating generation. Understanding the genetic behaviour of lint and fuzz formation in cotton is crucial for improving cotton production and developing new cotton varieties with desired traits. Result The current study was intended to evaluate the genetic diversity among different fuzzy and fuzzless genotypes and to understand the gene action and combining ability of seed cotton yield and yield contributing characters along with fibre quality. Principal component analysis revealed that the first four principal component analyses (PCs) out of the total eleven PCs exhibited higher eigen values (> 1) and had maximum contribution to total variability (89.46%). The attributes that had maximum share to total divergence...

Indian Journal of Agricultural Research, Volume 57 Issue 2: 143-149 (April 2023)

Background: Gossypium hirsutum, the most widely cultivated crop in the world has concurrent impor... more Background: Gossypium hirsutum, the most widely cultivated crop in the world has concurrent importance for both fibre quality and yield. Polygenes regulate cotton output and a variety of factors affect the characteristic. As a result, it is essential to have thorough knowledge of the relationships between different component traits and fibre quality. Thus, the aim of the study was framed to know about the correlation along with cause-and-effect relationship among the economic traits. Mathods: Eight parents and 56 hybrids made up the experimental sample for our study, which were evaluated for 18 economically significant traits. The study was conducted at

Indian Journal Of Agricultural Research

Background: Gossypium hirsutum, the most widely cultivated crop in the world has concurrent impor... more Background: Gossypium hirsutum, the most widely cultivated crop in the world has concurrent importance for both fibre quality and yield. Polygenes regulate cotton output and a variety of factors affect the characteristic. As a result, it is essential to have thorough knowledge of the relationships between different component traits and fibre quality. Thus, the aim of the study was framed to know about the correlation along with cause-and-effect relationship among the economic traits. Mathod: Eight parents and 56 hybrids made up the experimental sample for our study, which were evaluated for 18 economically significant traits. The study was conducted at Department of Cotton, Tamil Nadu Agricultural University, Coimbatore, in 2021-2022. Results: Analysis of variance was highly significant for all the traits studied. The result of correlation revealed that the traits viz., number of bolls per plant, boll weight, number of seeds per boll, upper half mean length and fibre strength had a ...

Allele matrix of 192 accessions x 61 SSRs. (XLSX 10 kb)

Expected product size obtained from Gramene and observed product size for the SSR markers used in... more Expected product size obtained from Gramene and observed product size for the SSR markers used in this study. (XLS 170 kb)

Background: Genetic diversity is the main source of variability in any crop improvement program. ... more Background: Genetic diversity is the main source of variability in any crop improvement program. It serves as a reservoir for identifying superior alleles controlling key agronomic and quality traits through allele mining/ association mapping. Association mapping based on LD (Linkage dis-equilibrium), non-random associations between causative loci and phenotype in natural population is highly useful in dissecting out genetic basis of complex traits. For any successful association mapping program, understanding the population structure and assessing the kinship relatedness is essential before making correlation between superior alleles and traits. The present study was aimed at evaluating the genetic variation and population structure in a collection of 192 rice germplasm lines including local landraces, improved varieties and exotic lines from diverse origin. Results: A set of 192 diverse rice germplasm lines were genotyped using 61 genome wide SSR markers to assess the molecular ge...

Agricultural Science Digest – A Research Journal, 2017

Nine rice genotypes were evaluated for this present study. Genetic variability parameters, correl... more Nine rice genotypes were evaluated for this present study. Genetic variability parameters, correlation and path coefficient analysis were estimated for eleven agronomic and quality traits. Among all the genotypes, ASD 16 recorded highest significant grain yield per plant. In this present study, the PCV was higher than GCV for all the characters studied. The grain yield per plant recorded highest GCV, high heritability coupled with high genetic advance which indicates that the trait were governed by epistasis and dominant gene action. Number of productive tillers per plant and thousand grain weight showed positive significant correlation and direct effects on grain yield per plant. The purpose of this study is to estimate the amount of variability present in this material, which in turn helps to select these material for further breeding programme to develop high yield hybrids combine with blast and leaf folder resistance.

Allelic pattern of different SSR markers used in this study. (JPG 1.03 MB)

Rice (New York, N.Y.), 2015

Genetic diversity is the main source of variability in any crop improvement program. It serves as... more Genetic diversity is the main source of variability in any crop improvement program. It serves as a reservoir for identifying superior alleles controlling key agronomic and quality traits through allele mining/association mapping. Association mapping based on LD (Linkage dis-equilibrium), non-random associations between causative loci and phenotype in natural population is highly useful in dissecting out genetic basis of complex traits. For any successful association mapping program, understanding the population structure and assessing the kinship relatedness is essential before making correlation between superior alleles and traits. The present study was aimed at evaluating the genetic variation and population structure in a collection of 192 rice germplasm lines including local landraces, improved varieties and exotic lines from diverse origin. A set of 192 diverse rice germplasm lines were genotyped using 61 genome wide SSR markers to assess the molecular genetic diversity and ge...

Cereal Chemistry, 2009

Cereal Chem. 86(5):492-498 Amylose content is a parameter that correlates with the cooking behav-... more Cereal Chem. 86(5):492-498 Amylose content is a parameter that correlates with the cooking behav- ior of rice. It is measured at the earliest possible stages of rice improve- ment programs to enable breeders to build the foundations of appropriate grain quality during cultivar development. Amylose is usually quantified by absorbance of the amylose-iodine complex. The International Network for Quality Rice