Dormancy and growth-inhibitor levels in oospores of Chara contraria A. Braun ex Kütz. (Charophyta)

Experiments on oospores of Chara contraria A. Braun ex Kutz. studied the correlation between dormancy and plant growth inhibitors. Fresh oospores, harvested from a drainage channel, showed a germination rate in vitro of 44–85%. Extracts from oospores harvested at the end of the summer contained inhi...

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Bibliographic Details
Published in:Aquatic botany 1987-07, Vol.28 (2), p.189-194
Main Authors: Sabbatini, M.R., Argüello, J.A., Fernández, O.A., Bottini, R.A.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Plant physiology and development
Vegetative and sexual reproduction, floral biology, fructification
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Summary:Experiments on oospores of Chara contraria A. Braun ex Kutz. studied the correlation between dormancy and plant growth inhibitors. Fresh oospores, harvested from a drainage channel, showed a germination rate in vitro of 44–85%. Extracts from oospores harvested at the end of the summer contained inhibitory activity, which co-chromatographed with abscisic acid, but no inhibitors were detected in harvests from the beginning of the summer nor in oospores which lay dormant at the botton of the channel. No correlation between inhibitory activity and dormancy was detected. Our results support the hypothesis that the inhibitors detected play a role in the abscission of oospores from the mother plant.
ISSN:0304-3770
1879-1522
DOI:10.1016/0304-3770(87)90040-4