Similarities and Differences in the Acquisition of Fe and P by Dicot Plants

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Author
Lucena, Carlos
Porras, Rafael
Romera, Francisco Javier
Alcántara Vara, Esteban
García, María José
Pérez-Vicente, Rafael
Publisher
MDPIDate
2018Subject
IronPhosphorus
Ethylene
Nitric oxide
Phloem signals
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This review deals with two essential plant mineral nutrients, iron (Fe) and phosphorus
(P); the acquisition of both has important environmental and economic implications. Both elements
are abundant in soils but are scarcely available to plants. To prevent deficiency, dicot plants develop
physiological and morphological responses in their roots to specifically acquire Fe or P. Hormones
and signalling substances, like ethylene, auxin and nitric oxide (NO), are involved in the activation
of nutrient-deficiency responses. The existence of common inducers suggests that they must act in
conjunction with nutrient-specific signals in order to develop nutrient-specific deficiency responses.
There is evidence suggesting that P- or Fe-related phloem signals could interact with ethylene and NO
to confer specificity to the responses to Fe- or P-deficiency, avoiding their induction when ethylene
and NO increase due to other nutrient deficiency or stress. The mechanisms responsible for such
interaction are not clearly determined, and thus, the regulatory networks that allow or prevent cross
talk between P and Fe deficiency responses remain obscure. Here, fragmented information is drawn
together to provide a clearer overview of the mechanisms and molecular players involved in the
regulation of the responses to Fe or P deficiency and their interactions