GRANOS DE POLEN ANÓMALOS EN PASPALUM UNISPICATUM, P. DECUMBENS Y P. URVILLEI (POACEAE, PANICEAE)

ALEJANDRO F. ZUCOL ^{1, 2}

¹ Centro de Investigaciones Científicas y Tecnológicas Diamante, CONICET, Matteri y España, 3105 Diamante,

Entre Ríos, Argentina. E-mail: afzucol@alpha.arcride.edu.ar

ABSTRACT: Zucol A. F. 1998. Anomalous pollen grains in Paspalum unispicatum, P. decumbens and P. urvillei (Poaceae, Paniceae). Darwiniana 36: 95-100.

The pollen of Paspalum unispicatum (Scribn. et Mer.) Nash shows some anomalous types, such as: dyads and tetrads with partially divided monads, inaperturates, anomalous monoaperturates, biaperturates and triaperturates grains. In this paper the morphometric features of "normal" and anomalous pollen grains were compared, and their potential viability tested with aceto-carmine coloration. A comparative analysis of the pollen of upper and lower flowers showed that the abnormalities are independent of the position of the flowers. These anomalous types were also found in Paspalum decumbens Rottb., and Paspalum urvillei Steud. The anomalous pollen grains probably result from meiotic chromosome abnormalities in these tetraploid species.

Key words: Pollen, Paspalum, Paniceae, Poaceae.

Palabras clave: Polen, Paspalum, Paniceae, Poaceae.

² Miembro de la Carrera del Investigador, CONICET