CECOAL   02625
CENTRO DE ECOLOGIA APLICADA DEL LITORAL
Unidad Ejecutora - UE
artículos
Título:
Palinología de los géneros Maihuenia (Maihuenoideae) y Pereskia (Pereskioideae), Cactaceae de Argentina.
Autor/es:
GRACIELA A. CUADRADO; SILVINA S. GARRALLA
Revista:
BONPLANDIA
Editorial:
Instituto de Botánica del Nordeste
Referencias:
Lugar: Corrientes; Año: 2009 vol. 18 p. 5 - 12
ISSN:
0524-0476
Resumen:
Pollen grains of five species from two genera of the subfamilies Maihuenioideae and Pereskioideae (Cactaceae) are described with the optical and scanning microscopes: Maihuenia (F.A.C.Weber) K.Schum.: M. patagonica (Phil.) Brit. & Rose and M. poeppigii (Otto& Pfeiff) F.A.C. Weber ex K. Schum. (Maihuenioideae) and Pereskia Mill.: P. aculeata Mill., P. nemorosa Rojas Acosta and P. sacharosa Griseb. (Pereskioideae). The studied pollen grains of genera Maihuenia and Pereskia are prolate and spheroidal, medium and large sized. The apertures show variation in number: three to fourteen, colpate, with different pattern distribution and length of the colpus: Maihuenia has tricolpate grains and Pereskia 6-14 pantocolpate, some of them form syncolpos. The sculpture does not show marked differences between the species, which is microechinate and nanoechinate with perforations surrounded by a thickening. A key to determine the species of each genus and distinguish the two reconized pollen types is given: 1) tricolpate and 2) 6-14 pantocolpate.