Morphological Dissimilarity Among Mangabeira Tree Populations From Amapá and Paraíba, Brazil

Abstract

-Mangabeira fruits are collected from native populations under anthropic pressure. It is therefore essential to obtain morphogenetic information to genetically improve populations, thereby preventing genetic erosion. This research was carried out in the state Amapá and aimed to verify the morphological dissimilarity between two populations, one composed of 36 native progenies and one of eight progenies from Paraiba, outlined in lattices with two replications and six plants per part. The evaluated characteristics were: agronomic value (VA), treetop circumference (CCP), plant height (ALP), estimated number of fruits per plant (NEF), fruit color (COF), average weight of 10 fruits (PMF), fruit diameter (DF), average pulp weight of ten fruits (PMP), average length of 10 fruits (CMF), average number of seeds of 10 fruits (NMS). Our results indicate that the phenotype was mainly determined by responses to environmental changes; in the correlations, inherent fruit characteristics (weight, size, and color) did not affect the VA, while biometric characters influenced VA values. Higher plants presented larger fruits and a larger diameter, bigger quantities, there is also apparent contrast, with a larger amount of smaller size; the populations are dissimilar, indicating the possibility of obtaining of diverging superior segregating. Keywords:Apocynaceae. Hancornia speciosa. Genetic Diversity. Phenotypic Variability. UPGMA. DISSIMILARIDADES MORFOLÓGICAS ENTRE POPULAÇÕES DE MANGABEIRAS DO AMAPÁE DA PARAÍBA, BRASIL RESUMO -As frutas de mangabeiras são coletadas extrativamente em populações nativas sob grande pressão antrópica, devendo-se obter informações morfogenéticas para ações com reflexos no melhoramento genético que possam evitar a sua erosão genética. Esta pesquisa realizada no Amapá, teve como objetivo verificar a dissimilaridade morfológica entre duas populações, uma composta por 36 progênies nativas e outra com 8 da Paraíba, delineados em látices, com duas repetições e seis plantas por parcela. As características avaliadas foram: valor agronômico (VA); circunferência da copa da planta (CCP); altura da planta (ALP); número estimado de frutos na planta (NEF); cor do fruto (COF); peso médio de dez frutos (PMF); diâmetro do fruto (DF); peso médio da polpa de dez frutos (PMP); comprimento médio de dez frutos (CMF); número médio de sementes de dez frutos (NMS). As principais conclusões obtidas indicaram que o fenótipo foi devido principalmente as respostas às variações ambientais; nas correlações, características inerentes aos frutos (peso, tamanho e cor) não influenciaram o VA, enquanto que os caracteres biométricos influenciaram, plantas mais altas apresentaram frutos maiores e as com maior diâmetro maior quantidade, há também aparente compensação, com maior quantidade de frutos, estes são menores; as populações são dissimilares, indicando possibilidade da obtenção de segregantes divergentes superiores.

Genetic diversity in natural populations of Hancornia speciosa Gomes: Implications for conservation of genetic resources

“…Costa, Silva and Lédo (2011), using dominant RAPD markers in H. speciosa, obtained mean values for h of 0.17 and I of 0.25, which are similar to the means found in the present study. The reduced values of genetic diversity in H. speciosa should be monitored and quantified in several other populations, as they can reflect the anthropogenic pressure and genetic erosion (Yokomizo;Maia;Da Trindade, 2017).…”

Antioxidant Activity, Rutin Content and Genetic Similarity Between Matrices and Progenies of Hancornia speciosa

“…In addition, the phenotypic variation is strongly influenced by environmental components such as anthropological level, soil condition, climate, age of plants and genetic differences between individuals. While the species are not yet fully domestic, variability is an important factor to enable the plant selection for the establishment of orchards with greater uniformity and specific characteristics (Yokomizo et al, 2017). Thus, was aimed with this study to evaluate the antioxidant activity, the rutin content and genetic similarity between in vivo and in vitro matrices and progenies of six accessions from the Mangaba Active Germplasm Bank of the Embrapa Coastal Tablelands, SE, Brazil.…”