| Autor: |
Björn Walles, John R. Rowley |
| Rok vydání: |
2008 |
| Předmět: |
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| Zdroj: |
Nordic Journal of Botany. 5:241-254 |
| ISSN: |
0107-055X |
| DOI: |
10.1111/j.1756-1051.1985.tb01654.x |
| Popis: |
Tapetal cells of Pinus sylvesiris L. underwent one hypersecretory cycle during early pachytene and entered a second cycle by the time of mid pachytene in microspore mother cells. Initially in each cycle tapetal cells became papillaform then dome-shaped and thereafter, in conjunction with radial narrowing of the cells, dilation of the ER system was intensive throughout the cytoplasm. Recovery from hyperactivity culminated with the presence of plasmodesma-like connections between tapetal cells and a period of mitosis in tapetal cells. The differentiation of tapetal cells occurred asynchronously within a microsporangium and their dedifferentiation began nonuni-formly, becoming synchronous coincidental with the presence of “plasmodesmata”. Microsporangia increased in size and tapetal cells were laterally wide before “plasmodesmata” receded and tapetal cells again differentiated asynchronously. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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