Abstract
Iron and phosphorus are abundant elements in soils but poorly available for plant nutrition. The availability of these two nutrients represents a major constraint for fruit tree cultivation such as apple (Malus × domestica) leading very often to a decrease of fruit productivity and quality worsening. Aim of this study was to characterize common and specific features of plant response to Fe and P deficiencies by ionomic, transcriptomic and exudation profiling of apple roots. Under P deficiency, the root release of oxalate and flavonoids increased. Genes encoding for transcription factors and transporters involved in the synthesis and release of root exudates were upregulated by P-deficient roots, as well as those directly related to P acquisition. In Fe-deficiency, plants showed an over-accumulation of P, Zn, Cu and Mn and induced the transcription of those genes involved in the mechanisms for the release of Fe-chelating compounds and Fe mobilization inside the plants. The intriguing modulation in roots of some transcription factors, might indicate that, in this condition, Fe homeostasis is regulated by a FIT-independent pathway. In the present work common and specific features of apple response to Fe and P deficiency has been reported. In particular, data indicate similar modulation of a. 230 genes, suggesting the occurrence of a crosstalk between the two nutritional responses involving the transcriptional regulation, shikimate pathway, and the root release of exudates.
Key Message
For the first time, physiological and transcriptomic response of apple plants to Fe and P deficiencies have been thoroughly characterized and compared. Ionomic and transcriptomic analyses on apple roots have been performed and the data have been implemented with the metabolic profiling of root exudates. Our results highlighted that a physiological and transcriptional link occurs between the responses to Fe and P deficiencies in apple tree roots, which may contribute to the efficient strategy to mobilize nutrients from the soil exhibited by this plant species. Data of the present work highlight that the response to both Fe and P starvation shares common features in the modulation of transcription factors, the shikimate pathway and in the release of root exudates. To the best of our knowledge, this evidence suggests for the first time the existence of a cross talk between Fe and P nutritional pathways in tree plants.
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Data availability
All RNA-seq expression data are available at the public functional genomics data repository Gene Expression Omnibus (https://www.ncbi.nlm.nih.gov/geo) under the series entry (GSE122554; link:https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?&acc=GSE122554).
Abbreviations
- ACO:
-
1-Aminocyclopropane-1-carboxylate oxidase
- AGL42:
-
AGAMOUS-like 42
- ALMT:
-
Aluminum-activated malate transporter
- APR:
-
APS reductase
- APS:
-
ATP sulfurylase
- Aux/IAAs:
-
Auxin-responsive proteins
- bHLH:
-
Basic helix-loop-helix
- CHS:
-
Chalcone synthase
- CHS:
-
Chalcone synthase
- CM:
-
Chorismate mutase
- DFR:
-
Dihydroflavonol 4-reductase
- ERF:
-
Ethylene response factor
- FER:
-
Ferritin
- FRD:
-
Ferric reductase defective
- FRO:
-
Ferric reduction oxidase
- HCT:
-
Hydroxycinnamoyl-CoA shikimate/quinate hydroxycinnamoyl transferase
- HXXXD-type AT:
-
HXXXD-type acyl-transferase
- IRT:
-
Iron transporter
- LPR1:
-
Low phosphate root1
- MATE:
-
Multidrug and toxin efflux transporter
- MRP:
-
Multidrug resistance-associated protein
- MYBs:
-
Myeloblastosis family of transcription factors
- NAS:
-
Nicotianamine synthase
- NRAMP:
-
Natural macrophage resistant protein
- OPT:
-
Oligopeptide transporter
- PAP:
-
Purple acid phosphatases
- PDR:
-
Pleiotropic drug resistance
- PFK:
-
Phosphofructokinase
- PFK:
-
Phosphofructokinase
- PHO:
-
PHOSPHATE protein
- PHT transporters:
-
High-affinity phosphate transporters
- PLA2A:
-
Phospholipase A 2A
- PS3:
-
P-starvation induced transporter
- TCA cycle:
-
Tricarboxylic acid cycle
- VIT:
-
Vacuolar iron transporter
- ZFP:
-
Zinc-finger protein
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Acknowledgements
Research was supported by grants from Italian MIUR (FIRB-Programma “Futuro in Ricerca” RBFR127WJ9), Free University of Bolzano (TN5056). RNA sequencing analyses were performed at the Institute of Applied Genomics (IGA, Udine).
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FV, SV, YP, FH, LZ conducted experiments; FV, SV, SC, TM, RP, NT and LZ conceived and designed research; FV, SV, YP, FM, MM and LZ analysed -omic data. FV, YP, LZ, NT wrote the manuscript. All authors read and approved the manuscript.
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Table S9: Analyses of TFs-promoter binding sites of Arabidospis homologous to genes commonly modulated by by –Fe vs +P+Fe and –P vs +P+Fe (performed by PlantPAN 2.0, Chow et al., 2015) (XLSX 895 kb)
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Valentinuzzi, F., Venuti, S., Pii, Y. et al. Common and specific responses to iron and phosphorus deficiencies in roots of apple tree (Malus × domestica). Plant Mol Biol 101, 129–148 (2019). https://doi.org/10.1007/s11103-019-00896-w
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DOI: https://doi.org/10.1007/s11103-019-00896-w