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Meiotic restitution mechanisms involved in the formation of 2n pollen in Agave tequilana Weber and Agave angustifolia Haw
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 ab...
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Published in: | SpringerPlus 2012-09, Vol.1 (1), p.17-17, Article 17 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | 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. |
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ISSN: | 2193-1801 2193-1801 |
DOI: | 10.1186/2193-1801-1-17 |