Ontogeny, allometry and architecture of Psychotria tenuinervis (Rubiaceae)

Autor(es)

Rosseto, Vanessa ^{[1, 2]} ; Carneiro, Magda Silva ^[3] ; Ramos, Flavio Nunes ^[3] ; Maes dos Santos, Flavio Antonio ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Biol, Dept Biol Vegetal, Campinas, SP - Brazil

^[2] Univ Fed Pampa, Bage, RS - Brazil

^[3] Univ Fed Alfenas, Lab Ecol Fragmentos Florestais Alfenas, Alfenas, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Acta Botanica Brasilica; v. 27, n. 4, p. 730-736, OCT-DEC 2013.
• Citações Web of Science: 1

Resumo

We evaluated the ontogeny of the understory shrub Psychotria tenuinervis Müll.Arg., considering morphological and morphometric characters. Four ontogenetic stages were identified: seedling, juvenile, immature and adult (vegetative and reproductive phases). Size measurements and allometric relationships of the stem and crown were compared between the immature and adult stages. Diameter and total height of the stem, as well as crown depth and width, increased throughout the ontogenetic stages and differed among immature, vegetative adult and reproductive adult individuals. The number of branches was lower in immature individuals than in vegetative and reproductive adult individuals but did not differ between the last two. The bifurcation ratio did not vary during ontogenetic development. In general, allometric relationships between the stem and the crown were similar among the ontogenetic stages. Although there was a progressive increase in size during ontogenetic development, there was no change in the allometric relationships between the size variables and architecture of P. tenuinervis, indicating that the form of individuals does not change over the course of ontogeny. (AU)

• Processo FAPESP: 02/01803-5 - Estrutura populacional de "psychotria tenuinervis" (rubiaceae) em fragmentos de mata atlantica: efeito da distancia de bordas antropicas e naturais.
• Beneficiário: Vanessa Rosseto
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica