Incompatibilidade heteromórfica em Eichhornia Azurea (Pontederiaceae) no Pantanal da Nhecolandia, Mato Grosso do Sul

AUTOR(ES)

Nicolay Leme da Cunha

DATA DE PUBLICAÇÃO

2006

RESUMO

In heterostylous plants pollination between anthers and stigmas of equivalent heights are often compatible, but any other type of cross or self-pollination result in partial or total incompatibility. Eichhornia azurea is a fluctuant aquatic macrophyte, fixed in the substrate that is generally found in lagoons, rivers and flooded areas in South America. Previous studies on the tristylous E. azurea indicated the presence of heteromorphic incompatibility; however the incompatibility varies between regions and populations. In this study I aim to (1) estimate the frequency of the floral morphs of E. azurea in four populations in the Rio Negro farm, Pantanal of Nhecol?ndia, and to verify the existence of predominance of any floral morph in these locals, and (2) to verify the presence of self-incompatibility and heteromorphic incompatibility in E. azurea in two populations of the study area. The three floral morphs occurred in all four populations, in two populations frequency was near 1:1:1. The fruit and seed set were higher in legitimate cross pollination than in illegitimate cross or self-pollination. However, there were great quantities of fruits and seeds for illegitimates pollinations. The short styled morph presented the higher incompatibility followed by the long styled one; the middle style morph can be considered self-compatible because of the great number of seeds produce by illegitimate pollinations. The discrepancy in floral morphs frequencies in some lagoons can be related with the variation of the water level in the dry and flood periods, and connectivity with the river. The flexibility of heteromorphic incompatibility in E. azurea in Pantanal might be related with the scarcity of pollinators performing effective pollen flow.

ASSUNTO(S)

tristilia aguape heterostyly ecologia water peacock tristyly heterostilia

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