Department of Agronomy, University of Córdoba, Córdoba, Spain.
Plant Signal Behav. 2011 Jan;6(1):167-70. doi: 10.4161/psb.6.1.14111. Epub 2011 Jan 1.
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.
在缺铁条件下,策略 I(非禾本科)植物上调许多铁吸收基因的表达,并在根中发生形态变化。这些反应的调控尚不完全清楚,但自 20 世纪 80 年代以来,不同的结果表明生长素、乙烯和最近的一氧化氮起作用。铁吸收基因的上调不仅依赖于这些作为激活剂的激素,还依赖于其他一些信号,可能是韧皮部铁,其作为抑制剂起作用。尚不清楚所考虑的激素中哪一种是铁吸收基因的最后一个激活剂,但一些结果表明生长素作用于乙烯和一氧化氮的上游,并且乙烯可能是最后一个激活剂。