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Type: Artigo de periódico
Title: Reproductive biology and species geographical distribution in the Melastomataceae: a survey based on New World taxa
Author: Milla dos Santos, Ana Paula
Fracasso, Carla Magioni
dos Santos, Mirley Luciene
Romero, Rosana
Sazima, Marlies
Oliveira, Paulo Eugenio
Abstract: Apomictic plants are less dependent on pollinator services and able to occupy more diverse habitats than sexual species. However, such assumptions are based on temperate species, and comparable evaluation for species-rich Neotropical taxa is lacking. In this context, the Melastomataceae is a predominantly Neotropical angiosperm family with many apomictic species, which is common in the Campos Rupestres, endemism-rich vegetation on rocky outcrops in central Brazil. In this study, the breeding system of some Campo Rupestre Melastomataceae was evaluated, and breeding system studies for New World species were surveyed to test the hypothesis that apomixis is associated with wide distributions, whilst sexual species have more restricted areas. The breeding systems of 20 Campo Rupestre Melastomataceae were studied using hand pollinations and pollen-tube growth analysis. In addition, breeding system information was compiled for 124 New World species of Melastomataceae with either wide (1000 km) or restricted distributions. Most (80 ) of the Campo Rupestre species studied were self-compatible. Self-incompatibility in Microlicia viminalis was associated with pollen-tube arrest in the style, as described for other Melastomataceae, but most self-incompatible species analysed showed pollen-tube growth to the ovary irrespective of pollination treatment. Apomictic species showed lower pollen viability and were less frequent among the Campo Rupestre plants. Among the New World species compiled, 43 were apomictic and 77 sexual (24 self-incompatible and 53 self-compatible). Most apomictic (86 ) and self-incompatible species (71 ) presented wide distributions, whilst restricted distributions predominate only among the self-compatible ones (53 ). Self-compatibility and dependence on biotic pollination were characteristic of Campo Rupestre and narrowly distributed New World Melastomataceae species, whilst apomictics are widely distributed. This is, to a certain extent, similar to the geographical parthenogenesis pattern of temperate apomictics.
Subject: Apomixis
breeding system
Campo Rupestre
geographic distribution
rocky outcrops
Editor: Oxford Univ Press
Citation: Annals of Botany. Oxford Univ Press, v.110, n.3, p.667-679, 2012
Rights: fechado
Identifier DOI: 10.1093/aob/mcs125
Date Issue: 2012
Appears in Collections:IB - Artigos e Outros Documentos

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