The occurrence of polysety in relation to the number of archegonia in the female inflorescences ofPhascum cuspidatumHedw.
作者:
HughesJ. G.,
期刊:
Journal of Bryology
(Taylor Available online 1979)
卷期:
Volume 10,
issue 4
页码: 553-560
ISSN:0373-6687
年代: 1979
DOI:10.1179/jbr.1979.10.4.553
出版商: Taylor&Francis
数据来源: Taylor
摘要:
AbstractInPhascum cuspidatumthe number of sporophytes per inflorescence was found to increase, up to a certain limit, with increase in the number of archegonia present. The number of archegonia present varies with the age of the inflorescence, and fertilization terminates the production of archegonia. The common occurrence of solitary sporophytes is due to fertilization at a time when only a small number of archegonia is present in most inflorescences. Delayed fertilization, leading to an increase in the average number of archegonia per inflorescence, is a necessary precondition for increased occurrence of polysety. As many as five sporophytes in a single inflorescence formed capsules with spores without significant reduction in the size of capsules. Variation in the frequency of abortive embryos gave evidence of competition amongst sporophytes and this was most severe in the smaller inflorescences. The occurrence of polysety inTortula muralisappears to be governed by the same rules.
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