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IRONing out stress problems in crops: a homeostatic perspective

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Title IRONing out stress problems in crops: a homeostatic perspective
 
Creator Bandyopadhyay, Tirthankar
Prasad, Manoj
 
Subject Iron homeostasis
Iron uptake
phytosiderophore
abiotic stress
iron deficiency
 
Description Accepted date: 25 July 2020
Iron (Fe) is essential for plant growth and therefore plays a key role in influencing crop productivity worldwide. Apart from its central role in chlorophyll biosynthesis and oxidative phosphorylation (electron transfer), it is an important constituent of many enzymes involved in primary metabolism. Fe has different accessibilities to the roots in the rhizosphere depending upon whether it is ferrous (soluble) or ferric (insoluble) oxidation stages, which in turn, determine two kinds of Fe uptake strategies employed by the plants. The reduction strategy is exclusively found in non‐graminaceous plants wherein the ferrous Fe2+ is absorbed and translocated from the soil through specialized transporters. In contrast, the chelation strategy (widespread in graminaceous plants) relies on the formation of Fe (III)‐chelate complex as the necessary requirement of Fe uptake. Once inside the cell, Fe is translocated, compartmentalized and stored through a common set of physiological processes involving many transporters and enzymes whose functions are controlled by underlying genetic components, so that a fine balance of Fe homeostasis is maintained. Recently, molecular and mechanistic aspects of the process involving the role of transcription factors, signalling components, and cis‐acting elements have been obtained, which has enabled a much better understanding of its ecophysiology. This mini‐review summarizes recent developments in our understanding of Fe transport in higher plants with particular emphasis on crops in the context of major agronomically important abiotic stresses. It also highlights outstanding questions on the regulation of Fe homeostasis and lists potentially useful genes/regulatory pathways that may be useful for subsequent crop improvement under the stresses discussed through either conventional or transgenic approaches.
Authors' work in this area is supported by J.C. Bose National Fellowship Grant of
Department of Science and Technology, Government of India (File No.: JCB/2018/000001),
and the Core Grant of National Institute of Plant Genome Research, New Delhi, India. The
authors are thankful to DBT-eLibrary Consortium (DeLCON) for providing access to eresources. Authors declare no conflict of interest.
 
Date 2020-08-13T07:10:46Z
2020-08-13T07:10:46Z
2021
 
Type Article
 
Identifier Physiologia Plantarum, 171(4): 559-577
1399-3054
https://doi.org/10.1111/ppl.13184
https://onlinelibrary.wiley.com/doi/abs/10.1111/ppl.13184
http://223.31.159.10:8080/jspui/handle/123456789/1085
 
Language en_US
 
Format application/pdf
 
Publisher John Wiley & Sons