Electronic Resource
Oxford, UK
:
Blackwell Publishing Ltd
Physiologia plantarum
19 (1966), S. 0
ISSN:
1399-3054
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
Nodule-roots of Myrica cerifera (Southern Wax Myrtle) and Casuarina cunning hamiana (Australian Pine) have a negative geotropic curvature. Studies of their endogenotts auxin content revealed a pattern of correlation: the absence of detectable auxin when the geotropisni was negative. Non-nodulated roots of Myrica exhibited a normal positive geotropic curvature and possessed an auxin content within an anticipated range (10 mg/kg). Root nodules of Alnus species, whose roots exhibit a positive geotropic curvature, contained measurable endogenous auxin (20 mg IAA/kg).The presence of an indoleaectic acid oxidase system in Myrica and Casuarina root nodules has heen described and correlations are drawn between non-detectable endogenous auxin concentrations and high enzymatic activities.It is suggested that the negative geotropic curvature of the nodule-roots of Myrica and Casuarina is due to the presence of a sub-optimal concentration of auxin which in turn results from the activity of an indoleacetic aeid destroying system.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1399-3054.1966.tb09093.x
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