Abstract
Copper (Cu) is a trace mineral nutrient essential for plant growth; consequently, its uptake, trafficking, and redistribution are precisely controlled. Currently, little is known about the underlying regulatory mechanisms in rice. In this work, we identified OsHIPP24 as a Cu metallochaperone in rice. Heterologous expression of OsHIPP24 in wild-type yeast (Saccharomyces cerevisiae) strain BY4741 increased accumulation of Cu, as well as cadmium (Cd). OsHIPP24 was expressed constitutively in most tissues of rice, including root, stem, leaf, leaf sheath, internode, rachis, and spikelet, and particularly high in root stele along with the vascular bundle of the shoot. Overexpression or knockout of OsHIPP24 in rice led to stunted growth and reduced plant height, regardless of Cu levels in the growth medium. Taken together, these observations indicated that the physiological roles of OsHIPP24 involve the delivery of metal micronutrients via vascular tissues, and that OsHIPP24 plays a crucial role in the growth of rice.
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Abbreviations
- Cu:
-
Copper
- Cd:
-
Cadmium
- COPT:
-
COPPER Transporter
- ZIP:
-
Zinc-regulated transporter, Iron-regulated transporter-like Protein family
- YSL:
-
Yellow Stripe-Like family
- NA:
-
Nicotianamine
- HMAs:
-
Heavy metal-transporting ATPases
- Cu/Zn SOD:
-
Cu/Zn superoxide dismutase
- HPPs:
-
HMA plant proteins
- HIPPs:
-
HMA isoprenylated plant proteins
- OE:
-
Overexpression
- ORF:
-
Open reading frame
- SD-Ura:
-
SD medium without uracil
- SG-Ura:
-
SG medium without uracil
- TF:
-
Trigger factor protein
- IPTG:
-
Isopropyl-beta-d-thiogalactopyranoside
- cv:
-
Cultivar
- qRT-PCR:
-
Quantitative real-time PCR
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Acknowledgements
We thank the public technical service center of the Institute of Botany, Chinese Academy of Sciences, for help with the metal determination assays.
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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
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GC designed the research and wrote the manuscript; GC and SX carried out the experiment and analyzed data.
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Chen, G., Xiong, S. OsHIPP24 is a Copper Metallochaperone Which Affects Rice Growth. J. Plant Biol. 64, 145–153 (2021). https://doi.org/10.1007/s12374-020-09287-x
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DOI: https://doi.org/10.1007/s12374-020-09287-x