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A cytological analysis of the microsporogenesis was carried out in the  Agave tequilana  and  A. angustifolia  species. Several abnormalities such as chromosomal bridges, lagging chromosomes, micronuclei, monads, dyads and triads were found. The morphological analysis of the pollen, together with the above-mentioned  2n  microspores, allowed us to confirm the presence of  2n  pollen as well as its frequency. In both  A. tequilana  and  A. angustifolia  two different mechanisms were observed: the first mechanism, a failure in the cytokinesis in meiosis II caused the formation of dyads with two  2n  cells and triads containing two  n  cells and one  2n  cell; the second mechanism, involves an abnormal spindle, which caused the formation of triads with two  n  cells and one  2n  cell. Likewise, the presence of monads was detected in both species, these, might be caused by a failure of the cytokinesis in both meiotic divisions. This is the first report about the presence of a Second Division Restitution mechanism (SDR) which causes the formation of  2n  pollen in the genus  Agave . The genetic implications of the presence of  2n  pollen in the genus  Agave  are discussed.

Meiotic restitution mechanisms involved in the formation of 2n pollen in Agave tequilana Weber and Agave angustifolia Haw