ISSN:
1399-3054
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
Oat hull leachate, auxin and ethylene cause similar effects on oat (Avena sativa L. cv. Risto) seedlings: inhibited root elongation, swollen roots and extensive root hair formation. Micrographs reveal that the leachate caused a reorientation of the cell expansion in the root from a longitudinal to a radial direction. Dry weights showed that the distribution of nutrients from the endosperm into the seedling was not inhibited, but regulated by the leachate. Tests with Ag+, inhibiting the effects of ethylene, as well as biotests with seeds of Amaranthus caudatus L. cv Mörk Purpur excluded ethylene from being responsible for the morphological changes. Results of growth tests and Avena coleoptile bioassuys indicated that oat hull leachate contains a substance that is not identical with IAA, but mediates the effects of endogenous IAA of the seedling. In a parallell investigation (Häggqquist, M.-L. et al. 1988. - Physiol. Plant. 72: 423–127) the active substance of an high performance liquid chromatography (HPLC) fraction of the leachate was identified as tryptophan.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1399-3054.1988.tb05854.x
