Interaction between water soluble and volatile compounds of Cistus ladanifer L. |
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Authors: | Luís S Dias Ilídio Moreira |
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Institution: | (1) National Bioenergy Center, National Renewable Energy Laboratory, Golden, CO, USA |
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Abstract: | Summary. Phytotoxic activity of single and combined application of water soluble and volatile compounds of Cistus ladanifer on germination and early root growth of subterranean clover was investigated. Total germination, lag and speed of germination
were both inhibited and stimulated, with the activity of volatiles on total germination depending upon the presence of water
solubles. Antagonism between water solubles and volatiles was always found, resulting in a reduction of inhibition or a shift
from inhibition to stimulation. It is suggested that the simultaneous presence of water solubles and volatiles might result
in changes of the chemical nature of metabolites released by C. ladanifer. Early root growth was always inhibited but only by water solubles, and no interaction was found. The ecological implications
of these results are discussed in terms of the exhaustion of competitors seedbanks by a two-step process in which germination
is less inhibited or even stimulated by water solubles and volatiles, followed by a stronger and volatiles-independent inhibition
of early root growth.
Received 13 June 2001; accepted 13 Dezember 2001. |
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Keywords: | , Allelopathy —, antagonism —,Cistus ladanifer—, germination —, root growth —, synergism —,Trifolium subterraneum |
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