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Journal Article
OsIRO2 is responsible for iron utilization in rice and improves growth and yield in calcareous soil
2011
Overview
Iron (Fe) deficiency, a worldwide agricultural problem on calcareous soil with low Fe availability, is also a major human nutritional deficit. Plants induce Fe acquisition systems under conditions of low Fe availability. Previously, we reported that an Fe-deficiency-inducible basic helix-loop-helix (bHLH) transcription factor, OsIRO2, is responsible for regulation of the genes involved in Fe homeostasis in rice. Using promoter-
GUS
transformants, we showed that
OsIRO2
is expressed throughout a plant’s lifetime in a spatially and temporally similar manner to the genes
OsNAS1
,
OsNAS2
and
TOM1
, which is involved in Fe absorption and translocation. During germination,
OsIRO2
expression was detected in embryos.
OsIRO2
expression in vegetative tissues was restricted almost exclusively to vascular bundles of roots and leaves, and to the root exodermis under Fe-sufficient conditions, and expanded to all tissues of roots and leaves in response to Fe deficiency.
OsIRO2
expression was also detected in flowers and developing seeds. Plants overexpressing
OsIRO2
grew better, and
OsIRO2
-repressed plants showed poor growth compared to non-transformant rice after germination.
OsIRO2
overexpression also resulted in improved tolerance to low Fe availability in calcareous soil. In addition to increased Fe content in shoots, the overexpression plants accumulated higher amounts of Fe in seeds than non-transformants when grown on calcareous soil. These results suggest that
OsIRO2
is synchronously expressed with genes involved in Fe homeostasis, and performs a crucial function in regulation not only of Fe uptake from soil but also Fe transport during germination and Fe translocation to grain during seed maturation.
Publisher
Springer Netherlands,Springer Nature B.V
Subject
Adaptation, Physiological - genetics
/ Biomedical and Life Sciences
/ Calcium
/ Gene Expression Regulation, Plant
/ genes
/ humans
/ Iron
/ Leaves
/ Oryza - growth & development
/ Plant Physiological Phenomena - genetics
/ Plant Physiological Phenomena - physiology
/ Plants, Genetically Modified - genetics
/ Plants, Genetically Modified - physiology
/ Rice
/ Roots
/ Seeds
/ shoots
/ Soil
/ Soils
/ tissues
/ Yield
