Abstract
P availability determined the root uptake and root–shoot translocation of micronutrients. Total root 14C exudation was significantly higher under P−Fe− across wheat cultivars. Although malate than citrate was the predominant constituent of the root exudates in wheat, their release was higher under P− than P+ condition, irrespective of the Fe availability.A higher release of phytosiderophores was measured under P−Fe− than P+Fe+ for bread than durum wheat. The study highlights the role of root exudates in influencing the mobilization, uptake and translocation of not only P and Fe but also Mn and to some extent Cu, particularly under the nutrient-starved (P−Fe−) condition of growth.
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Abbreviations
- OA:
-
Organic acid
- PS:
-
Phytosiderophore
- DAT:
-
Days after transfer
- PUE:
-
Phosphorus use efficiency
- TI:
-
Translocation index
- P:
-
Phosphorus
- Mn:
-
Manganese
- Cu:
-
Copper
- Zn:
-
Zinc
- fw:
-
Fresh weight
- PVDF:
-
Polyvinylidene fluoride
- DEAE-cellulose:
-
Diethylaminoethyl cellulose
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Raktim Mitra thanks ICAR for financial support during the Masters program at IARI, New Delhi.
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RM executed the experiments, collected and analysed the results; SBS helped in HPLC analysis of organic acids; BS conceptualized, facilitated and supervised the experiments and wrote the paper.
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Mitra, R., Singh, S.B. & Singh, B. Radiochemical evidence validates the involvement of root released organic acid and phytosiderphore in regulating the uptake of phosphorus and certain metal micronutrients in wheat under phosphorus and iron deficiency. J Radioanal Nucl Chem 326, 893–910 (2020). https://doi.org/10.1007/s10967-020-07383-3
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DOI: https://doi.org/10.1007/s10967-020-07383-3