4 research outputs found
Parâmetros biométricos de sementes de acessos de palma de óleo de banco de germoplasma brasileiro
The objective of this work was to evaluate the morphological diversity of oil palm seeds and to cluster the accessions according to their morphological characteristics. Forty‑one accessions from the oil palm germplasm bank of Embrapa AmazĂ´nia Ocidental were evaluated – 18 of Elaeis oleifera and 23 of E. guineensis. The groups were formed based on morphological characteristics, by principal component analysis. In E. oleifera, four groups were formed, tied to their region of origin, but with significant morphological differences between accessions from the same population. For tenera‑type E. guineensis seeds, three widely divergent groups were formed, especially as to external parameters, which differentiated them from the other ones. The parameter endocarp thickness stood out in intra‑ and inter‑population differentiation. For dura‑type E. guineensis, three groups were formed, with larger seeds and thicker endocarps, which differed from all the other ones. The variability observed for seed characteristics in the analyzed accessions allows the establishment of different groups, to define strategies for genetic improvement.O objetivo deste trabalho foi avaliar a diversidade morfolĂłgica de sementes de palma de Ăłleo e agrupar os acessos de acordo com as suas caracterĂsticas morfolĂłgicas. Foram avaliados 41 acessos do banco de germoplasma de palma de Ăłleo da Embrapa AmazĂ´nia Ocidental – 18 de Elaeis oleifera e 23 de E. guineensis. Os agrupamentos foram formados com base em caracterĂsticas morfolĂłgicas, por meio de análise de componentes principais. Em E. oleifera, foram formados quatro grupos ligados Ă s suas regiões de origem, mas com diferenças morfolĂłgicas significativas entre acessos de uma mesma população. Para sementes de E. guineensis do tipo tenera, foram formados trĂŞs grupos bastante divergentes, especialmente quanto aos parâmetros externos, os quais os diferenciaram dos demais. O parâmetro espessura do endocarpo se destacou na diferenciação intra e interpopulacional. Para E. guineensis do tipo dura, houve a formação de trĂŞs grupos, com sementes maiores e endocarpos mais espessos, que diferiram dos demais. A variabilidade observada para as caracterĂsticas das sementes, nos acessos analisados, permite estabelecer grupos divergentes, para definição de estratĂ©gias de melhoramento genĂ©tico
Seed biometric parameters in oil palm accessions from a Brazilian germplasm bank
The objective of this work was to evaluate the morphological diversity of oil palm seeds and to cluster the accessions according to their morphological characteristics. Forty-one accessions from the oil palm germplasm bank of Embrapa Amazônia Ocidental were evaluated - 18 of Elaeis oleifera and 23 of E. guineensis. The groups were formed based on morphological characteristics, by principal component analysis. In E. oleifera, four groups were formed, tied to their region of origin, but with significant morphological differences between accessions from the same population. For tenera-type E. guineensis seeds, three widely divergent groups were formed, especially as to external parameters, which differentiated them from the other ones. The parameter endocarp thickness stood out in intra- and inter-population differentiation. For dura-type E. guineensis, three groups were formed, with larger seeds and thicker endocarps, which differed from all the other ones. The variability observed for seed characteristics in the analyzed accessions allows the establishment of different groups, to define strategies for genetic improvement