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Biologia reprodutiva de rubiaceas arbustivas de mata atlantica

Biblioteca Digital da Unicamp
Publication Date
  • Polinização
  • Reprodução
  • Rubiacea
  • Biology


Pollination biology and incompatibility systems to a large extent control gene flow within natural populations, thus data on this respect may contribute for the comprehension of diversity maintenance within plant populations of different environments. Distyly is a reproductive system commonly observed in the family Rubiaceae, being characterized by the presence of two floral morphs, which are reciprocally herkogamous, self- and intramorph-incompatible, in a equivalent number of individuals within the population. The absence of any one of these features in typically distylous plants may evolve as a result of low availability or inefficient behavior of pollinators, being interpreted as a case of atypical distyly, or a new reproductive strategy derived from it. This study presents data on the pollination biology, compatibility relations of all species, and morphometric comparisons between floral morphs of five Rubiaceae species from the Atlantic rain forest, SE Brazil: Psychotria jasminoides, P. birotula, P. mapourioides, P. pubigera, P. nuda e Chiococca alba. Data were colIected through observation of floral events, pollinators and reproductive experiments for all species, floral organs measurements and estimative of morph ratio for distylous ones. Aside presenting smalI, tubular, diurnal, nectariferous (except one of them) flowers, some of the species studied are polIinated by different group of pollinators. Three species are typically distylous (P. jasminoides, P. birotula e P. mapourioides), two are atypical ones (P. pubigera e P. nuda), and one is herkogamous (C. alba). Results indicate some deviations of distylous patterns, as the lost of reciprocal herkogamy or isoplethy. Nevertheless, dimorphic species present distylous syndrome working as expected in stable populations, which probably is a result of the efficiency of pollinators in perform intermorph polIen flow in addition with the self incompatibility system. Chiococca alba has a reproductive strategy different to those expected for its tribe, but inc1uding features of both. Similarly to distylous plants, its flowers are herkogamous and, as those species with secondary pollen presentation on the style, polIen is released at the bud stage. This species presents a low frequency of visits, is self-incompatible, with low fruit production through self-pollination and apomixis; nevertheless, it has relatively high fruit set under natural conditions, which suggests that those visits, together with the fruits produced by self pollination and apomixes, maintain the population at the study site

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