Meiotic restitution mechanisms involved in the formation of 2n pollen in Agave tequilana Weber and Agave angustifolia Haw.
Meiotic restitution mechanisms involved in the formation of 2n pollen in Agave tequilana Weber and Agave angustifolia Haw.
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DOI：
10.1186/2193-1801-1-17
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Barba-Gonzalez R
中科院分区：
文献类型：
--
作者：
Gómez-Rodríguez VM;Rodríguez-Garay B;Barba-Gonzalez R
对龙舌兰和龙舌兰的小孢子发生进行了细胞学分析。染色体桥、滞后染色体、微核、单体、双体、三联体等异常。通过对花粉的形态分析，结合上述的2n小孢子，我们确认了2n花粉的存在及其频率。在龙舌兰和刺叶麻中均观察到两种不同的机制：第一种机制，减数分裂II期细胞质分裂失败，形成含有2个2n细胞的二联体和含有2个n细胞和1个2n细胞的三联体；第二种机制涉及异常纺锤体，导致形成两个n细胞和一个2n细胞的三联体。同样，在两个物种中都检测到单体的存在，这可能是由于两次减数分裂中细胞分裂失败引起的。本文首次报道了龙舌兰属植物中存在导致2n花粉形成的二次分裂恢复机制（SDR）。本文讨论了龙舌兰属植物中存在2n花粉的遗传意义。
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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影响因子：
3.1
作者：
Barba-Gonzalez, R;Ramanna, MS;Van Tuyl, JM
通讯作者：
Van Tuyl, JM
影响因子：
1.9
作者：
Crespel, L.;Ricci, S. C.;Gudin, S.
通讯作者：
Gudin, S.
影响因子：
1.9
作者：
Khan, Nadeem;Barba-Gonzalez, Rodrigo;Van Tuyl, Jaap M.
通讯作者：
Van Tuyl, Jaap M.
影响因子：
3.1
作者：
Lopez-Lavalle, LAB;Orjeda, G
通讯作者：
Orjeda, G
影响因子：
5.4
作者：
Lim, KB;Ramanna, MS;van Tuyl, JM
通讯作者：
van Tuyl, JM