In:
The Plant Cell, Oxford University Press (OUP), Vol. 26, No. 5 ( 2014-06-30), p. 2249-2264
Abstract:
Iron is essential for both plant growth and human health and nutrition. Knowledge of the signaling mechanisms that communicate iron demand from shoots to roots to regulate iron uptake as well as the transport systems mediating iron partitioning into edible plant tissues is critical for the development of crop biofortification strategies. Here, we report that OPT3, previously classified as an oligopeptide transporter, is a plasma membrane transporter capable of transporting transition ions in vitro. Studies in Arabidopsis thaliana show that OPT3 loads iron into the phloem, facilitates iron recirculation from the xylem to the phloem, and regulates both shoot-to-root iron signaling and iron redistribution from mature to developing tissues. We also uncovered an aspect of crosstalk between iron homeostasis and cadmium partitioning that is mediated by OPT3. Together, these discoveries provide promising avenues for targeted strategies directed at increasing iron while decreasing cadmium density in the edible portions of crops and improving agricultural productivity in iron deficient soils.
Type of Medium:
Online Resource
ISSN:
1532-298X
,
1040-4651
DOI:
10.1105/tpc.114.123737
Language:
English
Publisher:
Oxford University Press (OUP)
Publication Date:
2014
detail.hit.zdb_id:
623171-8
detail.hit.zdb_id:
2004373-9
SSG:
12
