ASPECTOS FLORAIS E REPRODUTIVOS DE PSYCHOTRIA CAPITATA RUIZ & PAVON (RUBIACEAE), UM CASO DE DISTILIA TÍPICA NO CERRADO
DOI:
https://doi.org/10.4257/oeco.2021.2503.05Keywords:
heterostyly, pollination, reciprocal herkogamyAbstract
A integração fenotípica observada em flores é uma estratégia evolutiva que visa o aumento do fluxo de pólen entre indivíduos, favorecendo o cruzamento e a manutenção da variabilidade genética. Esse sucesso tem relação direta com a estrutura floral, como o hermafroditismo, e com o comportamento dos visitantes, podendo gerar conflitos entre as estruturas florais, sendo selecionadas características que reduzem esse conflito e ampliam o fluxo de pólen, como é o caso da heterostilia. O objetivo do estudo foi descrever as características florais, o sistema reprodutivo, e a polinização em Psychotria capitata Ruiz & Pavon (Rubiaceae). Para tal foram medidas e observadas as estruturas florais, realizados cruzamentos controlados, observados os visitantes florais e avaliado a produção de néctar. Psychotria capitata é uma espécie distílica típica, arbustiva com no máximo 3 metros de altura, com altos índices de hercogamia recíproca entre os morfos florais. Apresenta flores brancas, tubulares, visitadas por uma ampla gama de insetos, incluindo mariposas, abelhas, vespas e moscas. Houve formação maior de frutos em polinização cruzada intermorfo (> 60 %) e menor formação em polinização intramorfo (< 20 %) e autopolinização (< 15 %), caracterizando a auto e intramorfo incompatibilidade. Esses dados foram confirmados pelo não crescimento de tubos polínicos em pistilos autopolinizados e polinizados de forma intramorfo. A floração é anual, e ocorre entre os meses de outubro e janeiro, com pico de floração em novembro e dezembro. Os dados reprodutivos avaliados se mostram similares a outras espécies de Rubiaceae do sub bosque de ambientes florestais do Cerrado. Esses dados enriquecem o conhecimento reprodutivo das espécies de Rubiaceae de sub bosque, tão importantes para a manutenção da fauna em fragmentos florestais.
BREEDING SYSTEMS AND POLLINATION OF THE PSYCHOTRIA CAPITATA RUIZ & PAVON (RUBIACEAE): A CASE THE TYPICAL DISTYLY IN CERRADO: The phenotypic integration observed in flowers is an evolutionary strategy that aims to increase the pollen flow between individuals, favoring the crossing and maintenance of genetic variability. This success is directly related to the floral structure, such as hermaphroditism, and to the behavior of visitors, and can generate conflicts between the floral structures, being selected characteristics that reduce this conflict and amplify the pollen flow, as is the case of heterostyly. The objective of the study was to describe the floral characteristics, the reproductive system, and pollination in Psychotria capitata Ruiz & Pavon (Rubiaceae). For this purpose, the floral structures were measured and observed, controlled crossings were carried out, the floral visitors were observed and the nectar production was evaluated. Psychotria capitata is a typical dystylic species, shrub with a maximum height of 3 meters, with high rates of reciprocal hercogamy between the floral morphs. It has white tubular flowers, visited by a wide range of insects, including moths, bees, wasps and flies. There was higher fruit formation in intermorphic cross-pollination (> 60 %) and lower formation in intramorphic (< 20 %) and self-pollination (< 15 %), characterizing self and intramorphic incompatibility. These data were confirmed by the non growth of pollen tubes in self-pollinated pistils and intramorphic pollinators. Blooming is annual, and occurs between the months of October and January, with peak blooming in November and December. The reproductive data evaluated are similar to other Rubiaceae species in the Cerrado forest sub forest. These data enrich the reproductive knowledge of Rubiaceae's sub-forest species, so important for the maintenance of fauna in forest fragments.
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