ISSN:
1399-3054
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
Protonemata of the moss Funaria hygrometrica (Hedw.) are grown in large amounts in a liquid culture system, allowing repetitive dry weight measurements for growth control. Ten-day-old protonemata are submitted to various light conditions, in the presence of a cytokinin (iP), which is known for its activity in bud initiation in the moss protonema. The hormone has no influence on the growth rate. Growth and budding are shown to be tightly related. Light is necessary for the initiation of buds but not for their development (to some extent). Identical protonematal growth can be obtained in white, Ted or blue light, but not budding, which is reduced in red or blue light. The early morphological changes in red light, known as nutations, and the presumed inhibitor in blue light could be responsible for the reduced budding. Bud initiation in the dark on an organic medium is greatly enhanced if red light pulses are given at regular intervals. When the latter are followed immediately by far-red light pulses, the stimulating effect is partly suppressed, suggesting a phytochrome-controlled process.Experiments with DCMU showed a peculiar effect of this herbicide, which inhibited the use of exogenous sugar in the light but not in the dark.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1399-3054.1981.tb05038.x
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