Data/hora: 11/06/2024 02:10:06

Biblioteca(s): | Embrapa Rondônia.
Data corrente: | 13/12/2021
Data da última atualização: | 14/12/2021
Autoria: | MORAES, M. S.
Afiliação: | MARCOS SANTANA MORAES, Universidade Federal de Rondônia (UNIR).
Título: | Compatibilidade gametofítica e quantificação da interação genótipo x ambientes de clones superiores de Coffea canephora na Amazônia Ocidental.
Ano de publicação: | 2018
Fonte/Imprenta: | 2018.
Páginas: | 47 f.
Idioma: | Português
Notas: | Dissertação (Mestrado em Ciências Ambientais) - Programa de Pós-graduação em Ciências Ambientais, Universidade Federal de Rondônia, Rolim de Moura. Orientador: Alexsandro Lara Teixeira. Coorientador: Rodrigo Barros Rocha.

Conteúdo:

O objetivo no presente trabalho foi caracterizar grupos de compatibilidade e quantificar a interação GxA de clones híbridos superiores de C. canephora em diferentes ambientes da Amazônia Ocidental. Os genótipos avaliados nos testes de compatibilidade foram provenientes de polinização aberta e de hibridações direcionadas utilizando o genótipo Encapa03 como genitor masculino doador de grãos de pólen e o Robusta640, o Robusta 2258 e o Robusta1675 como genitores femininos, receptores dos grãos de pólen. Observou-se uma predominância de cruzamentos compatíveis (73,7%), que apresentaram taxa média de pagamento de 44% com amplitude de 26% a 77%. Do total de 80 cruzamentos realizados, dois cruzamentos apresentaram resultados não esperados de acordo com o agrupamento proposto. A partir do grau de parentesco entre os genótipos avaliados foi estimada a genealogia do gene S e segregação dos alelos de uma geração para a outra. Na quantificação do efeito da interação GxA a análise de variância conjunta indicou que efeito de genótipos, de ambiente e da interação foram significativos de acordo com o teste F(p<0,01). Os genótipos híbridos 16, 10, 13, 9 e 14 apresentaram menores índices de Pi comforme a metodologia não
paramétrica de LIN & BINNS, ranqueados como mais estáveis, com produtividade média de 61,5 sacas ha-1 , superando o desempenho dos clones testemunhas. Na dispersão obtida através do método centroide os híbridos 16 e 13 se aproximaram do ideótipo I, que representa a planta ideal de produção máxima em todos os ambientes. Os híbridos 10, 9, 15 e a testemunha BRS Ouro Preto 125 apresentaram adaptabilidade específica a ambientes favoráveis com classificação semelhante aos ideótipos II e VI, que se caracterizam pelo desempenho máximo nos ambientes favoráveis e desempenho mínimo ou médio nos ambientes desfavoráveis. Os métodos LIN & BINNS e centroide permitiram estimar a adaptabilidade e estabilidade dos genótipos conforme os ambientes. Considerado o progresso genético da produtividade de café beneficiado e os grupos de compatibilidade, os genótipos híbridos de ampla adaptabilidade, e os de adaptabilidade específica a ambientes favoráveis e desfavoráveis, deverão ser recomendados para plantio na Amazônia Ocidental.

The objective in the present study was to characterize the compatibility groups and to quantify the interaction GxA of superior hybrids clones of C. canephora in different environments of the Western Amazon. The genotypes evaluated were derived from open pollination and from directed hybridizations using Encapa03 as a male parent donor of pollen grains and Robusta640, Robusta 2258, and Robusta1675 as female parent receptors of pollen grains. Compatible crosses (73.7%) were predominant. Compatible crosses exhibited a mean rate of fruit set of 44%, with amplitude from 26% to 77%. Of the total of 80 crosses performed, two crosses exhibited unexpected results according to the grouping proposed. From the degree of relatedness between the genotypes evaluated, the genealogy of the S gene and the segregation of the alleles from one generation to another was estimated. In the quantification of the effect interaction GxA the analysis of joint variance indicated that effect of genotypes, environments and interaction were significant according to F test (p <0.01). The hybrids genotypes 16, 10, 13, 9 and 14 provided lower rates of Pi according to the nonparametric methodology of LIN & BINNS, being classified as more stable presenting average productivity of 61.5 bags / ha-1 , surpassing the performance of the control clones. In the dispersion obtained by the centroid method, the hybrids 16 and 13 approached the ideotype I, which represents the ideal maximum production plant in every environments. The hybrids clones 10, 9, 15 and control 125 showed specific adaptability to favorable environments with similar classification to ideotypes II and VI, if characterized by maximum performance in favorable environments and minimum or medium performance in unfavorable environments. The centroid and LIN & BINNS methods allowed estimate the adaptability and stability of the genotypes according ye environments. Considering the genetic progress of productivity in coffee benefited and compatibility groups, the hybrid genotypes of wide adaptability and those of specific adaptability to favorable and unfavorable environments, should be recommended for planting in the Western Amazon.

The objective in the present study was to characterize the compatibility groups and to quantify the interaction GxA of superior hybrids clones of C. canephora in different environments of the Western Amazon. The genotypes evaluated were derived from open pollination and from directed hybridizations using Encapa03 as a male parent donor of pollen grains and Robusta640, Robusta 2258, and Robusta1675 as female parent receptors of pollen grains. Compatible crosses (73.7%) were predominant. Compatible crosses exhibited a mean rate of fruit set of 44%, with amplitude from 26% to 77%. Of the total of 80 crosses performed, two crosses exhibited unexpected results according to the grouping proposed. From the degree of relatedness between the genotypes evaluated, the genealogy of the S gene and the segregation of the alleles from one generation to another was estimated. In the quantification of the effect interaction GxA the analysis of joint variance indicated that effect of genotypes, environments and interaction were significant according to F test (p <0.01).The hybrids genotypes 16, 10, 13, 9 and 14 provided lower rates of Pi according to the nonparametric methodology of LIN & BINNS, being classified as more stable presenting average productivity of 61.5 bags / ha-1, surpassing the performance of the control clones. In the dispersion obtained by the centroid method, the hybrids 16 and 13 approached the ideotype I, which represents the ideal maximum production plant in every environments. The hybrids clones 10, 9, 15 and control 125 showed specific adaptability to favorable environments with similar classification to ideotypes II and VI, if characterized by maximum performance in favorable environments and minimum or medium performance in unfavorable environments. The centroid and LIN & BINNS methods allowed estimate the adaptability and stability of the genotypes according ye environments. Considering the genetic progress of productivity in coffee benefited and compatibility groups, the hybrid genotypes of wide adaptability and those of specific adaptability to favorable and unfavorable environments, should be recommended for planting in the Western Amazon.

Palavras-Chave: | Café Conilon; Interação genótipo x ambiente.
Thesagro: | Café; Café Robusta; Clone; Coffea Canephora; Hibrido; Interação Genética; Melhoramento Genético Vegetal; Variação Genética.
Thesaurus Nal: | Genetic variation; Genotype-environment interaction; Hybrids; Plant breeding.
Categoria do assunto: | G Melhoramento Genético
Registro original: | Embrapa Rondônia (CPAF-RO)
Exemplares: | CPAF-RO - (18643-1) - UPA - TS - DD -  -  -  - DIS