Latest findings about the interplay of auxin, ethylene and nitric oxide in the regulation of Fe deficiency responses by Strategy I plants.
Under Fe deficiency, Strategy I (non-graminaceous) plants up-regulate the expression of many Fe acquisition genes and develop morphological changes in their roots. The regulation of these responses is not completely known, but since the 1980's different results suggest a role for auxin, ethylene and, more recently, nitric oxide. The up-regulation of the Fe acquisition genes does not depend solely on these hormones, that would act as activators, but also on some other signals, probably phloem Fe, that would act as an inhibitor. It is not known which of the hormones considered is the last activator of the Fe acquisition genes, but some results suggest that auxin acts upstream of ethylene and NO and that, perhaps, ethylene is the last activator.
Department of Agronomy, University of Córdoba, Córdoba, Spain.
Francisco J
FJ
Romera
María J
MJ
García
Esteban
E
Alcántara
Rafael
R
Pérez-Vicente
D017360:Arabidopsis / Q000235:genetics / Q000378:metabolism*; D005030:Ethylenes / Q000378:metabolism*; D017343:Genes, Plant / Q000235:genetics; D007210:Indoleacetic Acids / Q000378:metabolism*; D007501:Iron / Q000378:metabolism; D000090463:Iron Deficiencies; D008954:Models, Biological; D009569:Nitric Oxide / Q000378:metabolism*; D018517:Plant Roots / Q000166:cytology / Q000378:metabolism
D005030:Ethylenes; D007210:Indoleacetic Acids; D009569:Nitric Oxide; C036216:ethylene; D007501:Iron
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