PHENOTYPIC AND GENETIC PARAMETERS ESTIMATED FOR FRESH CORN UNDER DIFFERENT NUTRIENT AVAILABILITY
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Revista Caatinga |
Texto Completo: | https://periodicos.ufersa.edu.br/caatinga/article/view/9556 |
Resumo: | The objective of this work was to estimate and compare phenotypic and genetic parameters after three cycles of intrapopulation recurrent selection for fresh corn grown under three nutrient availability conditions. Three experiments derived from the same population (MV-003) were conducted to assess the ability of progenies to absorb nutrients, one under adequate fertilization (control; MV-006), one under low nitrogen availability (N; MV-006N), and one under low phosphorus availability (P; MV-006P). The experiments were carried out in randomized blocks, with 64 half-sib progenies and three replications for each nutritional condition. Chlorophyll index, plant height, ear insertion, ear diameter, ear length, unhusked ear yield, and marketable husked ear were evaluated. The populations showed variability for the three nutrient availability conditions. The variability reduced after only three selection cycles; thus, evaluating a higher number of half-sib progenies, above 64, under low N and P availability is indicated. The rates used to identify the most efficient progenies in breeding programs should be close to the appropriate one, with a slow reduction after the selection cycles. The variability will be thus maintained, with a greater possibility of identifying more promising progenies. In addition, the frequency of favorable alleles increases more gradually and effectively. The N and P rate of 60 kg ha-1 is not indicated as a critical level for the initial phase of the program. |
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PHENOTYPIC AND GENETIC PARAMETERS ESTIMATED FOR FRESH CORN UNDER DIFFERENT NUTRIENT AVAILABILITYESTIMATIVAS DE PARÂMETROS FENOTÍPICOS E GENÉTICOS EM MILHO VERDE SOB DIFERENTES DISPONIBILIDADES NUTRICIONAIS Zea mays. Seleção recorrente. Baixo nitrogênio. Baixo fósforo. Meios-irmãos.Zea mays. Recurrent selection. Low nitrogen. Low phosphorus. Half-sib.The objective of this work was to estimate and compare phenotypic and genetic parameters after three cycles of intrapopulation recurrent selection for fresh corn grown under three nutrient availability conditions. Three experiments derived from the same population (MV-003) were conducted to assess the ability of progenies to absorb nutrients, one under adequate fertilization (control; MV-006), one under low nitrogen availability (N; MV-006N), and one under low phosphorus availability (P; MV-006P). The experiments were carried out in randomized blocks, with 64 half-sib progenies and three replications for each nutritional condition. Chlorophyll index, plant height, ear insertion, ear diameter, ear length, unhusked ear yield, and marketable husked ear were evaluated. The populations showed variability for the three nutrient availability conditions. The variability reduced after only three selection cycles; thus, evaluating a higher number of half-sib progenies, above 64, under low N and P availability is indicated. The rates used to identify the most efficient progenies in breeding programs should be close to the appropriate one, with a slow reduction after the selection cycles. The variability will be thus maintained, with a greater possibility of identifying more promising progenies. In addition, the frequency of favorable alleles increases more gradually and effectively. The N and P rate of 60 kg ha-1 is not indicated as a critical level for the initial phase of the program.O objetivo deste trabalho foi estimar e comparar parâmetros fenotípicos e genéticos após três ciclos de seleção recorrente intrapopulacional em milho fresco sob três disponibilidades nutricionais. Três experimentos derivados de uma mesma população foram realizados para avaliar a capacidade das progênies em adquirir os nutrientes, um sob fertilização adequada (controle – MV-006), outro sob baixa disponibilidade de nitrogênio (N – MV-006N) e outro sob baixa disponibilidade de fósforo (P – MV-006P). Os experimentos foram realizados em delineamento de blocos casualizados, com 64 progênies de meios-irmãos, com três repetições. Foram avaliadas as características de índice relativo de clorofila, altura da planta e inserção da espiga, diâmetro e comprimento da espiga, produtividade de espigas empalhadas e despalhadas. As populações apresentam variabilidade para as três condições de disponibilidade nutricional. A variabilidade foi muito reduzida com apenas três ciclos de seleção, sendo indicado avaliar um número maior de progênies de meios-irmãos, acima de 64, sob baixa disponibilidade de N e P. A dose a ser usada para identificar as progênies mais eficientes no programa de melhoramento deve estar próxima a recomendada, com uma redução lenta após os ciclos seletivos. Dessa forma, a variabilidade será mantida e com maior possibilidade de identificação de progênies mais promissoras. Além disso, a frequência de alelos favoráveis aumenta de forma mais gradual e eficaz, sendo que a dose de 60 kg ha-1 de N e P não é indicada na fase inicial do programa, como nível crítico.Universidade Federal Rural do Semi-Árido2021-09-27info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://periodicos.ufersa.edu.br/caatinga/article/view/955610.1590/1983-21252021v34n402rcREVISTA CAATINGA; Vol. 34 No. 4 (2021); 752-762Revista Caatinga; v. 34 n. 4 (2021); 752-7621983-21250100-316Xreponame:Revista Caatingainstname:Universidade Federal Rural do Semi-Árido (UFERSA)instacron:UFERSAenghttps://periodicos.ufersa.edu.br/caatinga/article/view/9556/10737Copyright (c) 2021 Revista Caatingainfo:eu-repo/semantics/openAccessResende, Cecília Leão PereiraMartins, Juliana BezerraIlaria, Felipe RibeiroSantos, Carla Mariane Machado dosRodrigues, Fabricio2023-07-04T13:29:23Zoai:ojs.periodicos.ufersa.edu.br:article/9556Revistahttps://periodicos.ufersa.edu.br/index.php/caatinga/indexPUBhttps://periodicos.ufersa.edu.br/index.php/caatinga/oaipatricio@ufersa.edu.br|| caatinga@ufersa.edu.br1983-21250100-316Xopendoar:2024-04-29T09:46:50.896990Revista Caatinga - Universidade Federal Rural do Semi-Árido (UFERSA)true |
dc.title.none.fl_str_mv |
PHENOTYPIC AND GENETIC PARAMETERS ESTIMATED FOR FRESH CORN UNDER DIFFERENT NUTRIENT AVAILABILITY ESTIMATIVAS DE PARÂMETROS FENOTÍPICOS E GENÉTICOS EM MILHO VERDE SOB DIFERENTES DISPONIBILIDADES NUTRICIONAIS |
title |
PHENOTYPIC AND GENETIC PARAMETERS ESTIMATED FOR FRESH CORN UNDER DIFFERENT NUTRIENT AVAILABILITY |
spellingShingle |
PHENOTYPIC AND GENETIC PARAMETERS ESTIMATED FOR FRESH CORN UNDER DIFFERENT NUTRIENT AVAILABILITY Resende, Cecília Leão Pereira Zea mays. Seleção recorrente. Baixo nitrogênio. Baixo fósforo. Meios-irmãos. Zea mays. Recurrent selection. Low nitrogen. Low phosphorus. Half-sib. |
title_short |
PHENOTYPIC AND GENETIC PARAMETERS ESTIMATED FOR FRESH CORN UNDER DIFFERENT NUTRIENT AVAILABILITY |
title_full |
PHENOTYPIC AND GENETIC PARAMETERS ESTIMATED FOR FRESH CORN UNDER DIFFERENT NUTRIENT AVAILABILITY |
title_fullStr |
PHENOTYPIC AND GENETIC PARAMETERS ESTIMATED FOR FRESH CORN UNDER DIFFERENT NUTRIENT AVAILABILITY |
title_full_unstemmed |
PHENOTYPIC AND GENETIC PARAMETERS ESTIMATED FOR FRESH CORN UNDER DIFFERENT NUTRIENT AVAILABILITY |
title_sort |
PHENOTYPIC AND GENETIC PARAMETERS ESTIMATED FOR FRESH CORN UNDER DIFFERENT NUTRIENT AVAILABILITY |
author |
Resende, Cecília Leão Pereira |
author_facet |
Resende, Cecília Leão Pereira Martins, Juliana Bezerra Ilaria, Felipe Ribeiro Santos, Carla Mariane Machado dos Rodrigues, Fabricio |
author_role |
author |
author2 |
Martins, Juliana Bezerra Ilaria, Felipe Ribeiro Santos, Carla Mariane Machado dos Rodrigues, Fabricio |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Resende, Cecília Leão Pereira Martins, Juliana Bezerra Ilaria, Felipe Ribeiro Santos, Carla Mariane Machado dos Rodrigues, Fabricio |
dc.subject.por.fl_str_mv |
Zea mays. Seleção recorrente. Baixo nitrogênio. Baixo fósforo. Meios-irmãos. Zea mays. Recurrent selection. Low nitrogen. Low phosphorus. Half-sib. |
topic |
Zea mays. Seleção recorrente. Baixo nitrogênio. Baixo fósforo. Meios-irmãos. Zea mays. Recurrent selection. Low nitrogen. Low phosphorus. Half-sib. |
description |
The objective of this work was to estimate and compare phenotypic and genetic parameters after three cycles of intrapopulation recurrent selection for fresh corn grown under three nutrient availability conditions. Three experiments derived from the same population (MV-003) were conducted to assess the ability of progenies to absorb nutrients, one under adequate fertilization (control; MV-006), one under low nitrogen availability (N; MV-006N), and one under low phosphorus availability (P; MV-006P). The experiments were carried out in randomized blocks, with 64 half-sib progenies and three replications for each nutritional condition. Chlorophyll index, plant height, ear insertion, ear diameter, ear length, unhusked ear yield, and marketable husked ear were evaluated. The populations showed variability for the three nutrient availability conditions. The variability reduced after only three selection cycles; thus, evaluating a higher number of half-sib progenies, above 64, under low N and P availability is indicated. The rates used to identify the most efficient progenies in breeding programs should be close to the appropriate one, with a slow reduction after the selection cycles. The variability will be thus maintained, with a greater possibility of identifying more promising progenies. In addition, the frequency of favorable alleles increases more gradually and effectively. The N and P rate of 60 kg ha-1 is not indicated as a critical level for the initial phase of the program. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-09-27 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://periodicos.ufersa.edu.br/caatinga/article/view/9556 10.1590/1983-21252021v34n402rc |
url |
https://periodicos.ufersa.edu.br/caatinga/article/view/9556 |
identifier_str_mv |
10.1590/1983-21252021v34n402rc |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://periodicos.ufersa.edu.br/caatinga/article/view/9556/10737 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2021 Revista Caatinga info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2021 Revista Caatinga |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal Rural do Semi-Árido |
publisher.none.fl_str_mv |
Universidade Federal Rural do Semi-Árido |
dc.source.none.fl_str_mv |
REVISTA CAATINGA; Vol. 34 No. 4 (2021); 752-762 Revista Caatinga; v. 34 n. 4 (2021); 752-762 1983-2125 0100-316X reponame:Revista Caatinga instname:Universidade Federal Rural do Semi-Árido (UFERSA) instacron:UFERSA |
instname_str |
Universidade Federal Rural do Semi-Árido (UFERSA) |
instacron_str |
UFERSA |
institution |
UFERSA |
reponame_str |
Revista Caatinga |
collection |
Revista Caatinga |
repository.name.fl_str_mv |
Revista Caatinga - Universidade Federal Rural do Semi-Árido (UFERSA) |
repository.mail.fl_str_mv |
patricio@ufersa.edu.br|| caatinga@ufersa.edu.br |
_version_ |
1797674028922568704 |