title: Inhibiting action of fusicoccin on the ethylene production of Pisum sativum.
abstract: The ability of several auxins to induce C2H4 production was examined. There is an ability scale among the various products in which IAA is the more efficient compound while 2,4-D seems to be the less efficient one. As well as other general phenomena, e.g. enlargement or weight increase, even in this case a biphasic action seems to exist, with an activation at the lower concentrations and an inhibition at the higher ones. The dose corresponding to the critical point, in which one can observe the inversion of the response, seems to be common to all the substances and to be 1 X 10(-4)M. Subsequently we verified the FC influence on the C2H4 production in the presence of the optimal dose of different auxins. The inhibiting action exerted by the toxine is a function of the concentration and does not depend on the inducing substance. The FC determines a drastic reduction in C2H4 production, nearly 60%, for the entire range of the concentrations studied. The described data give evidence of a strong FC interference on ethilene production of etiolated pea internodes.
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000494:pharmacology; D005030:Ethylenes / Q000378:metabolism*; D006027:Glycosides / Q000494:pharmacology*; D007210:Indoleacetic Acids / Q000494:pharmacology; D009280:Naphthaleneacetic Acids / Q000494:pharmacology; D010944:Plants / Q000187:drug effects / Q000378:metabolism*; D013844:Thiazoles / Q000494:pharmacology
chemical_list: D005030:Ethylenes; D006027:Glycosides; D007210:Indoleacetic Acids; D009280:Naphthaleneacetic Acids; D013844:Thiazoles; C007808:fusicoccin; D015084:2,4-Dichlorophenoxyacetic Acid; C040417:1,2-benzisothiazole-3-acetic acid; C034182:1-naphthaleneacetic acid; C030737:indoleacetic acid; C036216:ethylene