Repeatability and genotypic stability of agronomic characteristics in Panicum maximum Jacq.
ABSTRACT In experiments with selection of perennial plants, the initial performance is expected to be maintained throughout the productive life. The probability of repeating the agronomic response can be evaluated by the repeatability coefficient. The objective was to estimate repeatability coeffici...
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Instituto de Investigaciones Agropecuarias, INIA
2019
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oai:scielo:S0718-583920190004005472019-11-19Repeatability and genotypic stability of agronomic characteristics in Panicum maximum Jacq.Ferreira,Mariane RodriguesMartuscello,Janaina AzevedoBraz,Thiago Gomes dos SantosNascimento,Artur AmaralJank,LianaAssis,Juliana Aparecida deAlmeida,Otávio Goulart deReis,Gabriel de AssisSantos,Márcia VitóriaSantos,Mateus Figueiredo Forage leaf:stem ratio repeated measures. ABSTRACT In experiments with selection of perennial plants, the initial performance is expected to be maintained throughout the productive life. The probability of repeating the agronomic response can be evaluated by the repeatability coefficient. The objective was to estimate repeatability coefficients of agronomic characteristics in Panicum maximum Jacq. using different methods and identify the best combinations between harvests according to the genotypic stabilization. Seventeen genotypes were evaluated in a randomized complete block design with three replicates. The coefficients of repeatability were estimated by the methods: ANOVA, structural analysis based on the mean of the correlation coefficients (SACOR), analysis of principal components based on the covariance matrix (PCCOV) and correlation matrix (PCCOR). In the genotypic stabilization, coefficients estimated by ANOVA and PCCOR were used. For total DM, repeatability coefficients ranged from 0.3500 to 0.4300 by the ANOVA and PCCOR methods, respectively. High repeatability coefficients were found for the characteristic leaf DM, while low coefficients were observed for leaf and stem percentages and leaf:stem ratio. For the genotypic stabilization of total DM and leaf:stem ratio, the best coefficients were observed for the combination of harvests 5 to 8. There are variations in the estimate of repeatability by different methods and the highest coefficients were those of the principal components based on the correlation and covariance matrices. For the genotypic stabilization, the best coefficients of repeatability and determination were observed for the harvests performed in the second rainy period.info:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAChilean journal of agricultural research v.79 n.4 20192019-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392019000400547en10.4067/S0718-58392019000400547 |
| institution |
Scielo Chile |
| collection |
Scielo Chile |
| language |
English |
| topic |
Forage leaf:stem ratio repeated measures. |
| spellingShingle |
Forage leaf:stem ratio repeated measures. Ferreira,Mariane Rodrigues Martuscello,Janaina Azevedo Braz,Thiago Gomes dos Santos Nascimento,Artur Amaral Jank,Liana Assis,Juliana Aparecida de Almeida,Otávio Goulart de Reis,Gabriel de Assis Santos,Márcia Vitória Santos,Mateus Figueiredo Repeatability and genotypic stability of agronomic characteristics in Panicum maximum Jacq. |
| description |
ABSTRACT In experiments with selection of perennial plants, the initial performance is expected to be maintained throughout the productive life. The probability of repeating the agronomic response can be evaluated by the repeatability coefficient. The objective was to estimate repeatability coefficients of agronomic characteristics in Panicum maximum Jacq. using different methods and identify the best combinations between harvests according to the genotypic stabilization. Seventeen genotypes were evaluated in a randomized complete block design with three replicates. The coefficients of repeatability were estimated by the methods: ANOVA, structural analysis based on the mean of the correlation coefficients (SACOR), analysis of principal components based on the covariance matrix (PCCOV) and correlation matrix (PCCOR). In the genotypic stabilization, coefficients estimated by ANOVA and PCCOR were used. For total DM, repeatability coefficients ranged from 0.3500 to 0.4300 by the ANOVA and PCCOR methods, respectively. High repeatability coefficients were found for the characteristic leaf DM, while low coefficients were observed for leaf and stem percentages and leaf:stem ratio. For the genotypic stabilization of total DM and leaf:stem ratio, the best coefficients were observed for the combination of harvests 5 to 8. There are variations in the estimate of repeatability by different methods and the highest coefficients were those of the principal components based on the correlation and covariance matrices. For the genotypic stabilization, the best coefficients of repeatability and determination were observed for the harvests performed in the second rainy period. |
| author |
Ferreira,Mariane Rodrigues Martuscello,Janaina Azevedo Braz,Thiago Gomes dos Santos Nascimento,Artur Amaral Jank,Liana Assis,Juliana Aparecida de Almeida,Otávio Goulart de Reis,Gabriel de Assis Santos,Márcia Vitória Santos,Mateus Figueiredo |
| author_facet |
Ferreira,Mariane Rodrigues Martuscello,Janaina Azevedo Braz,Thiago Gomes dos Santos Nascimento,Artur Amaral Jank,Liana Assis,Juliana Aparecida de Almeida,Otávio Goulart de Reis,Gabriel de Assis Santos,Márcia Vitória Santos,Mateus Figueiredo |
| author_sort |
Ferreira,Mariane Rodrigues |
| title |
Repeatability and genotypic stability of agronomic characteristics in Panicum maximum Jacq. |
| title_short |
Repeatability and genotypic stability of agronomic characteristics in Panicum maximum Jacq. |
| title_full |
Repeatability and genotypic stability of agronomic characteristics in Panicum maximum Jacq. |
| title_fullStr |
Repeatability and genotypic stability of agronomic characteristics in Panicum maximum Jacq. |
| title_full_unstemmed |
Repeatability and genotypic stability of agronomic characteristics in Panicum maximum Jacq. |
| title_sort |
repeatability and genotypic stability of agronomic characteristics in panicum maximum jacq. |
| publisher |
Instituto de Investigaciones Agropecuarias, INIA |
| publishDate |
2019 |
| url |
http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392019000400547 |
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