Resumo

DELGADO-HUERTAS, Hernando  e  ARANGO-WIESNER, Laura. Morphoagronomic characterisation of pineapple (Ananas spp.) genotypes in high-terrace soil near Villavicencio. Orinoquia [online]. 2015, vol.19, n.2, pp.153-165. ISSN 0121-3709.

Colombia is a centre for the pineapple's genetic diversity. Commercial crop areas are expected to expand on Colombia's eastern plains (the Llanos Orientales). The pineapple's genetic base must be expanded for its genetic improvement; potentially useful characters/features for improvement can be identified by characterising and evaluating genetic resources. This work was thus aimed at evaluating the genetic variability of a pineapple germplasm collection kept at CORPOICA's La Libertad research centre in Villavicencio (Colombia, 336 masl). International Plant Genetic Resources Institute (IPGRI) descriptors were used with five randomly chosen plants from each of eight genotypes established in an acid savannah soil: six from the edible species Ananas comosus var. comosus andtwo from the ornamental species A. comosus spp. The data regarding fifteen quantitative, vegetative and fruit descriptors for four of the genotypes (the MD-2 commercial hybrid, the Cayena Lisa and Mayanéz commercial cultivars and the Mitú native cultivar) were analysed by comparing means and principal component analysis. Greater variability was found regarding the vegetative descriptors than the fruit ones, plant height (PH), leaf width (LW), leaf weight D (LWD), peduncle length (PL) and fruit length (FL) having greater explained variance and discriminatory power between genotypes. Regarding qualitative descriptors, it is worth highlighting the great variability concerning how thorns were distributed on leaf margins. Morphological differences and similarities between these genotypes were identified. The introduction, characterisation and agronomic evaluation of other native cultivars must be continued as the basis for projects aimed at developing new improved germplasm or for direct use in small-scale organic production.

Palavras-chave : pineapple; descriptor; genetic variability.

        · resumo em Português | Espanhol     · texto em Espanhol     · Espanhol ( pdf )