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Abstract
Aims Plants deploying a phosphorus (P)-mobilising strategy via carboxylate release have relatively high leaf manganese concentrations ([Mn]). Thus, leaf [Mn] is a proxy for the amount of rhizosheath carboxylates. Whether the concentrations of other leaf micronutrient, such as iron ([Fe]), zinc ([Zn]) and copper ([Cu]), show a similar signal for rhizosheath carboxylates is unclear. Methods We grew a large number of chickpea genotypes in two glasshouse studies with different growth media, P sources and P levels. Seven weeks after sowing, we determined concentrations of micronutrients in mature leaves, and the quantity and composition of rhizosheath carboxylates. Results For 100 genotypes grown in river sand with low P supply, leaf [Fe] (R-2 = 0.36) and [Zn] (R-2 = 0.22), like leaf [Mn] (R-2 = 0.38), were positively correlated with the total amount of rhizosheath carboxylates. For 20 genotypes grown in a soil mixture, leaf [Fe], [Zn], [Cu] and [Mn] showed positive correlations with total rhizosheath carboxylates that were stronger under moderately low P (R-2 = 0.59, 0.59, 0.54, 0.72) than severely low P (R-2 = 0.39, 0.28, 0.20, 0.36) or sufficient P (R-2 = 0.36, 0.00, 0.01, 0.50) supply. Malonate was the predominant carboxylate in the rhizosheath and was significantly correlated with leaf micronutrient concentrations in both experiments. Conclusions In addition to leaf [Mn], leaf [Fe] and [Zn] can be used as alternative and easily measurable proxies for belowground carboxylate-releasing processes in chickpea under low-P supply, particularly on moderately low-P soils.
Original language | English |
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Pages (from-to) | 31-46 |
Number of pages | 16 |
Journal | Plant and Soil |
Volume | 465 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - Aug 2021 |
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Dive into the research topics of 'In addition to foliar manganese concentration, both iron and zinc provide proxies for rhizosheath carboxylates in chickpea under low phosphorus supply'. Together they form a unique fingerprint.Projects
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Tightening the phosphorus cycle for grain legumes
Lambers, H. (Investigator 01), Siddique, K. (Investigator 02), Ryan, M. (Investigator 03), Clode, P. (Investigator 04), Varshney, R. (Investigator 05), Zhang, F. (Investigator 06), Cong, W. (Investigator 07) & Liu, Y. (Investigator 08)
ARC Australian Research Council
1/02/21 → 14/04/25
Project: Research