Mangifera indica (mango) is a typically tropical fruit with considerable economic value. Brazil features a wide variety of cultivars of this fruit, most of which are known under several different names. Indeed, the nomenclature of mango varieties is still quite confusing. Up to now there has been no well-defined scientific principle to differentiate them. The objective of the present work is to compare the different clustering methods in assessing genetic divergence among mango accessions, as well as identify the minimum efficient descriptors for that crop. A total of 20 mango accessions in Cáceres, Mato Grosso state, Brazil were evaluated. When building dissimilarity matrices, the descriptors were divided according to the following groups: leaf, flower/inflorescence, fruit, seed and growth habit/ripening period. With these divisions, combinations were performed among the groups of descriptors. The similarity index was used to obtain the dissimilarity matrices. Later, the accessions were clustered using the methods of Tocher, Ward and UPGMA. The study observed that it was possible to reduce the number of descriptors from 64 to 35, and that the clustering methods were compatible with the study of the genetic diversity of mango.
O objetivo deste trabalho foi avaliar o crescimento vegetativo inicial de quatro cultivares de abacaxizeiro em resposta à cultura de cobertura e à aplicação de gesso agrícola ao solo. O delineamento experimental foi o de blocos ao acaso, com 16 tratamentos, oriundos da combinação dos fatores cultivares, cultura de cobertura e gesso agrícola, com quatro níveis para cultivar (‘Smooth Cayenne’, ‘Imperial’, ‘IAC Fantástico’ e ‘Pérola’), dois níveis para cultura de cobertura (com milheto e sem cultura de cobertura) e dois níveis de gesso agrícola (0 e 4 t ha-1), arranjados no esquema de parcelas sub-subdivididas, com quatro repetições. Foram avaliadas a altura das plantas, o diâmetro da roseta e o diâmetro do caule o aos 0, 30 e 90 dias após o plantio das cultivares. Com base nos dados obtidos nas três avaliações calcularam-se, respectivamente, a taxa de crescimento em altura das plantas, a taxa de crescimento em diâmetro da roseta e a taxa de crescimento em diâmetro do caule. Nas condições edafoclimáticas da região de Cáceres - MT a cultivar ‘Pérola’ apresentou maior crescimento vegetativo inicial, se destacando em relação às cultivares ‘Smooth Cayenne’, ‘Imperial’ e ‘IAC- Fantástico’. O emprego da cultura de cobertura favoreceu o crescimento vegetativo inicial das cultivares de abacaxizeiro, porém, não foi observado efeito significativo da aplicação de gesso na taxa de crescimento em altura das plantas, a taxa de crescimento em diâmetro da roseta e a taxa de crescimento em diâmetro do caule.
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