Plant hormones and nutrient signaling

Abstract

Plants count on a wide variety of metabolic, physiological, and developmental responses to adapt their growth to variations in mineral nutrient availability. To react to such variations plants have evolved complex sensing and signaling mechanisms that allow them to monitor the external and internal concentration of each of these nutrients, both in absolute terms and also relatively to the status of other nutrients. Recent evidence has shown that hormones participate in the control of these regulatory networks. Conversely, mineral nutrient conditions influence hormone biosynthesis, further supporting close interrelation between hormonal stimuli and nutritional homeostasis. In this review, we summarize these evidences and analyze possible transcriptional correlations between hormonal and nutritional responses, as a means to further characterize the role of hormones in the response of plants to limiting nutrients in soil.

Strigolactones as mediators of plant growth responses to environmental conditions

“…65 Nitrate application was also shown to increase cytokinin biosynthesis and expression of its signaling components, leading to morphological effects on both roots and shoots (reviewed in ref. 24), whereas the reduction in shoot apical dominance in pea was suggested to be a result of reduced auxin transport out of the apex under conditions of B deficiency. 19 Notably, many of the phytohormones are coordinated with other phytohormones in their effects on plant development, and have multiple cross-talk junctions between them, forming a complex network of coordinated effects (reviewed in ref.…”

“…However, more research is needed to confer or rebut this hypothesis, since in many cases similar developmental responses may be triggered by different signaling mechanisms. 24 To conclude, further studies are clearly needed to determine the junction points of the co-regulation of SLs and light in lightregulated processes, in both shoots and roots. Moreover, the cross-talk between SLs and light-associated pathways might follow a feedback loop, because carotenoid biosynthesis has been shown to be light-dependent (reviewed in ref.…”

“…Key words: strigolactones, light, nutrient status, root, shoot, branching, lateral roots, root hairs development and architecture (reviewed in ref. [22][23][24] and to be mediators of the effects of environmental cues on plant development; one classic example is auxin's role in the plant's shadeavoidance response (reviewed in ref. 25).…”

Plasticity of the Arabidopsis Root System under Nutrient Deficiencies

“…In fact, nutrient supplies can strongly affect phytohormone gradients, as demonstrated by Fe triggering AUXIN INFLUX CARRIER1 (AUX1)-mediated auxin accumulation in LR tips and subsequent LR elongation (Giehl et al, 2012). Indeed, the deficiency of many nutrients has been reported to affect the levels of one or more hormones in plants (for review, see Rubio et al, 2009). However, for most nutrients, it is not yet known the extent to which and at which developmental steps these hormonal changes impact on RSA.…”

Morphological and plant hormonal changes during parasitization by Cuscuta japonica on Momordica charantia

“…Given that the amount of iP type CKs was higher in Cuscuta at stage 1 than that which the haustoria induced in vitro, the role of iP type CKs is not restricted to haustoria formation. In addition, iP type CKs may increase in nutrient-depleted plants, especially when nutrients are added (Takei et al 2004;Rubiom et al 2009). Cuscuta seedlings before parasitization clearly do not have an opportunity obtain any nutrients from the environment, and stage 1 is the first time to acquire nutrients after germination.…”