Granos de polen anómalos en Paspalum unispicatum, P. decumbens y P. urvillei (Paniceae: Panicoideae: Poaceae).

ZUCOL A F

DARWINIANA

IBODA

Lugar: San Isidro; Año: 1998 vol. 36 p. 95 - 100

0011-6793

The pollen of Paspalum unispicatum (Scribn. et Mer.) Nash shows some anomalous types, such as: dyads and tetrads with partially divided monads, inapertura¬tes, anomalous monoapertura¬tes, biaperturates and triaperturates grains. In this paper the morphometric features of "normals" and anomalous pollen grains are compared, and their potential viability is 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 are found also in the related species Paspalum decumbens Rottb. , and in the non related species: Paspalum urvillei Steudel. These anomalous pollen grains probably result from meiotic chromosome abnormalities in these tetraploid species.