Deposition of callose in young ovules of two Taraxacum species varying in the mode of reproduction
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- 作者：Krystyna Musia? ; Maria Ko?cińska-Paj?k ; Renata Antolec…
- 关键词：Apomixis ; Callose ; Chromosome number ; Diplospory megasporogenesis ; Taraxacum
- 刊名：Protoplasma
- 出版年：2015
- 出版时间：January 2015
- 年：2015
- 卷：252
- 期：1
- 页码：135-144
- 全文大小：1,107 KB
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Maria Ko?cińska-Paj?k (1)
Renata Antolec (1)
Andrzej J. Joachimiak (1)
1. Department of Plant Cytology and Embryology, Institute of Botany, Jagiellonian University in Krakow, Gronostajowa 9, 30-387, Cracow, Poland - 刊物类别：Biomedical and Life Sciences
- 刊物主题：Life Sciences
Cell Biology
Plant Sciences
Zoology - 出版者：Springer Wien
- ISSN：1615-6102
文摘
Although callose occurs during megasporogenesis in most flowering plants, the knowledge about its general function and the mechanisms by which the callose layer is formed in particular places is still not sufficient. The results of previous studies suggest a total lack of callose in the ovules of diplosporous plants in which meiosis is omitted or disturbed. This report is the first documentation of callose events in dandelions ovules. We demonstrated the pattern of callose deposition during the formation of megaspores through diplospory of Taraxacum type and during normal meiotic megasporogenesis in apomictic triploid Taraxacum atricapillum and amphimictic diploid Taraxacum linearisquameum. We found the presence of callose in the megasporocyte wall of both diplosporous and sexual dandelions. However, in a diplosporous dandelion, callose predominated at the micropylar pole of megaspore mother cell (MMC) which may be correlated with abnormal asynaptic meiosis and may indicate diplospory of the Taraxacum type. After meiotic division, callose is mainly deposited in the walls between megaspores in tetrads and in diplodyads. In subsequent stages, callose gradually disappears around the chalazal functional megaspore. However, some variations in the pattern of callose deposition within tetrad may reflect variable positioning of the functional megaspore (FM) observed in the ovules of T. linearisquameum.