Structural variation of Hevea brasiliensis (Willd. ex A. Juss.) M?ll. Arg. double grafted clones

Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2021-06-18T21:20:56Z No. of bitstreams: 1 2018 - Glaycianne Christine Vieira dos Santos.pdf: 3201887 bytes, checksum: 1e3d8040e933b5bc046152102762044d (MD5) Made available in DSpace on 2021-06-18T21:20:56Z (GMT). No. of bitstreams: 1 2018 - Glaycianne Christine Vieira dos Santos.pdf: 3201887 bytes, checksum: 1e3d8040e933b5bc046152102762044d (MD5) Previous issue date: 2018-02-22 Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES, Brasil) The main objective of this study was to characterize the wood anatomical structure of the rubber tree clone (PB311), under the influence of two different canopy grafts. The following rubber trees were selected in the system of double grafted system i) root from seeds + clone PB311 (panel) + clone FX2784 (canopy); and (ii) roots from seeds + clone PB311 (panel) + MDF180 clone (canopy). For each tree, disks located immediately below the insertion of the canopy clone were obtained, from which the regions corresponding to tension, opposite and normal wood, for posterior radial characterization were identified. The anatomical analyzes were conducted in accordance with the standards established by the International Association of Wood Anatomy Committee. The Kruskal-Wallis nonparametric test was applied, followed by the Bonferroni method for multiple comparisons among the types of woods and radial positions studied, both at 5% of significance. Multivariate associations were assessed among the anatomical characteristics of both double grafted rubber trees, by means of two step cluster analysis. Quantitative morphological differences were observed in the wood cells of the double grafted studied clones. The rays height and the vessels tangential diameter were the most important morphologic characteristics for the double grated trees distinction, indicating possible anatomical adaptations of PB311 clone in canopy graft. The canopy clone can modulate the quantitative anatomical characters of the panel clone, depending on the plant?s needs. O objetivo deste estudo foi caracterizar a estrutura anat?mica do lenho do clone de seringueira (PB311), sob a influ?ncia de dois diferentes enxertos de copa. Foram selecionadas as seguintes ?rvores de seringueiras em sistema de tricomposto: i) raiz proveniente de semente + clone PB311 (painel) + clone FX2784 (copa); e ii) raiz proveniente de semente + clone PB311 (painel) + clone MDF180 (copa). De cada ?rvore, foram obtidos discos localizados imediatamente abaixo da inser??o do clone de copa, a partir dos quais foram identificadas as regi?es correspondentes aos lenhos de tra??o, oposto e normal, para posterior caracteriza??o radial. As an?lises anat?micas foram conduzidas de acordo com os padr?es estabelecidos pelo International Association of Wood Anatomy Committee. Aplicou-se o teste n?o param?trico Kruskal-Wallis, seguido do m?todo de Bonferroni para compara??es m?ltiplas entre os tipos de lenhos e as posi??es radiais estudadas, ambos a 5% de signific?ncia. Foram avaliadas associa??es multivariadas entre as caracter?sticas anat?micas de ambas as seringueiras tricompostas, por meio de an?lise de cluster em duas etapas. Observaram-se diferen?as morfol?gicas quantitativas nas c?lulas do lenho dos clones tricompostos estudados. A altura dos raios e o di?metro tangencial dos vasos foram as caracter?sticas morfol?gicas mais importantes para a distin??o dos tricompostos, indicando poss?veis adapta??es anat?micas do clone PB311 em fun??o do enxerto de copa. O clone de copa pode modular os caracteres anat?micos quantitativos do clone de painel, em fun??o das necessidades da planta.