| Autor: |
Susan D. Waaland, Donna J. Koslowsky |
| Rok vydání: |
2007 |
| Předmět: |
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| Zdroj: |
Journal of Phycology. 23:638-648 |
| ISSN: |
0022-3646 |
| DOI: |
10.1111/j.1529-8817.1987.tb04218.x |
| Popis: |
Fusion of somatic cells from different geographic isolates of Griffithsia pacifica is followed by a cytoplasmic incompatibility reaction (CIR)5 in the cytoplasm donated by only one of the isolates. This CIR is characterized by the aggregation, fusion, and lysis of chloroplasts of the sensitive strain; the cholorplasts of the other strain are unaffected. Within a given cell, chloroplast fusions result in a 50% decrease in chloroplast number in the first 8 h; over the next 3–5 weeks, chloroplast lysis leads to the complete loss of photosynthetic pigments (18). Results of this ultrastructural study indicated that the primary effect of the cytoplasmic incompatibility reaction was a directed destruction of the sensitive strain chloroplasts. No aggregation or abnormalities were seen in organelles other than the chloroplasts. Chloroplast destruction was accompanied by extensive vesiculation of the cytoplasm and a definit change in the physiological state of the cell; the dictyosomes became inactive and there was a reduction in the amount of endoplasmic reticulum, cytoplasmic ribosomes and starch grains. This selective destruction of one chloroplast population in the presence of a second population of unaffected chloroplasts suggests that the incompatibility reaction observed in G. pacifica results from competitive interactions between the two chloroplast types. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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