Avaliação da produção polínica de Bromus catharticus Vahl e Guadua trinii (Nees) Nees ex Rupr. (Poaceae) para a interpretação de dados fósseis

Biotemas

Jefferson Nunes Radaeski¹  Soraia Girardi Bauermann¹ 

[1] Universidade Luterana do Brasil �? ULBRA, Laboratório de Palinologia

关键词: Dinâmica de transporte polínico;    Gramíneas;    Tafonomia polínica;   

DOI  :  

学科分类：生物科学（综合）

来源: Universidade Federal de Santa Catarina * Centro de Ciencias Biologicas

【 摘 要 】

http://dx.doi.org/10.5007/2175-7925.2016v29n4p9We evaluated pollen production per anther, per lower, and per spikelet of the grassland speciesBromus catharticusand the forest taxonGuadua trinii(Poaceae), which have divergent pollination syndrome. We collected ten anthers of each taxon to determine differences in pollen production based on pollination system. Anthers were macerated and pollen grains were counted in a Neubauer chamber. Pollen morphology was observed using optical and scanning electron microscopy to establish relationships between pollen grain production and morphology. The anemophilous speciesBromus catharticus(2,556,000 pollen grains/spikelet) has twice the pollen production per anther and per spikelet compared to  Guadua trinii(1,716,000 pollen grains/spikelet), a species that requires biotic assistance for pollination. Pollen grain size is inversely proportional to production. Microechinate ornamentation, which is not expected to occur in anemophilous species, was observed on pollen of both taxa. Our results indicate that the frequency of forest Poaceae in the quaternary records may be underestimated while frequency of grassland taxa may be overestimated, leading to misrepresentation of the respective flora in this period.

【 授权许可】

Unknown