Atypical embryo sacs in Allium cepa L.

Nadirashvili , Nino and Gvaladze, Guranda and Akhalkatsi, Maia (2005) Atypical embryo sacs in Allium cepa L. Bulletin of the Georgian National Academy of Sciences, 171 (2). pp. 312-314. ISSN 0132 - 1447

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Atypical embryo sacs have been revealed in Allium cepa L. The structural changes in Allium type embryo sac in this species take place in all three groups of cells – egg apparatus, central cell and antipodals. The following atypical developmental patterns have been observed: 1. Variation in the number of egg cells (1-3), synergids (1-6), polar nuclei (2-4) and antipodals (3-5); 2. Transformation of synergids and antipodals into additional egg cell; 3. Hypertrophy of more than one synergid and antipodals. It is assume that increase in the number of hypertrophic synergids and antipodals may improve nutrition of the developing embryo. And, the formation of additional egg cells derived from synergids or antipodals may increase probability that the ovule produces a seed. The additional embryos might be formed from egg-like synergids and antipodal cells. The increase in the number of cells in the embryo sac may be explained by mutations leading to the normal mitotic divisions in synergids and antipodals instead of endomitosis occurring during hypertrophy. In general, the female gametophyte in this species shows tendency in increase of structures responsible for seed formation.

Item Type: Article
Subjects: Q Science > QK Botany
S Agriculture > SB Plant culture
Depositing User: Prof.Dr. Maia Akhalkatsi
Date Deposited: 24 Feb 2014 07:52
Last Modified: 24 Mar 2015 11:11

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