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Chickpea displays a temporal growth response to Mesorhizobium strains under well-watered and drought conditions.

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dc.contributor.authorIqbal, N.
dc.contributor.authorBrien, C.
dc.contributor.authorJewell, N.
dc.contributor.authorBerger, B.
dc.contributor.authorZhou, Y.
dc.contributor.authorDenison, R.F.
dc.contributor.authorDenton, M.D.
dc.date.issued2025
dc.description.abstractThe relative performance of rhizobial strains could depend on their resource allocation, environmental conditions, and host genotype. Here, we used a highthroughput shoot phenotyping to investigate the effects of Mesorhizobium strain on the growth dynamics, nodulation and bacteroid traits with four chickpea (Cicer arietinum) varieties grown under different water regimes in an experiment including four nitrogen sources (two Mesorhizobium strains, and two uninoculated controls: nitrogen fertilised and unfertilised) under well-watered and drought conditions. We asked three questions. Does the impact of rhizobial strains on chickpea growth change with well-watered versus drought conditions? Do Mesorhizobium strains differ in their ability to influence biomass and nodule traits of chickpea varieties under well-watered and drought conditions? Are bacteroid size and amount of polyhydroxybutyrate modified by Mesorhizobium strain, chickpea variety, water availability and their interactions? Under well-watered conditions, chickpea inoculated with CC1192 showed higher shoot growth rates than M075 and accumulated high plant biomass at harvest. Under drought conditions, however, the shoot growth rate was comparable between CC1192 and M075, with no significant difference in plant biomass and symbiotic effectiveness at harvest. Across sources of variation, plant biomass varied 3.0-fold, nodules per plant 3.9-fold, nodule dry weight 3.0-fold, symbiotic effectiveness 1.5-fold, bacteroid size 1.4-fold and bacteroid polyhydroxybutyrate 1.4-fold. Plant biomass was negatively correlated with both bacteroid size and allocation to polyhydroxybutyrate under well-watered conditions, suggesting a trade-off between plant and rhizobial fitness. This study demonstrates the need to reassess rhizobial strain effectiveness across diverse environments, recognising the dynamic nature of their interaction with host plants.
dc.description.statementofresponsibilityNasir Iqbal, Chris Brien, Nathaniel Jewell, Bettina Berger, Yi Zhou, R. Ford Denison, Matthew D. Denton
dc.identifier.citationPhysiologia Plantarum, 2025; 177(1):e70041-1-e70041-11
dc.identifier.doi10.1111/ppl.70041
dc.identifier.issn1399-3054
dc.identifier.issn1399-3054
dc.identifier.orcidIqbal, N. [0000-0003-1133-8229]
dc.identifier.orcidBrien, C. [0000-0003-0581-1817]
dc.identifier.orcidBerger, B. [0000-0003-1195-4478]
dc.identifier.orcidZhou, Y. [0000-0002-7119-7408]
dc.identifier.orcidDenton, M.D. [0000-0002-2804-0384]
dc.identifier.urihttps://hdl.handle.net/2440/144934
dc.language.isoen
dc.publisherWILEY
dc.rights© 2025 The Author(s). This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
dc.source.urihttps://doi.org/10.1111/ppl.70041
dc.subjectrhizobial strains;highthroughput shoot phenotyping; Mesorhizobium strain;chickpea (Cicer arietinum);rhizobial strain
dc.subject.meshCicer
dc.subject.meshPlant Shoots
dc.subject.meshNitrogen
dc.subject.meshWater
dc.subject.meshBiomass
dc.subject.meshSymbiosis
dc.subject.meshRoot Nodules, Plant
dc.subject.meshPlant Root Nodulation
dc.subject.meshDroughts
dc.subject.meshMesorhizobium
dc.titleChickpea displays a temporal growth response to Mesorhizobium strains under well-watered and drought conditions.
dc.typeJournal article
pubs.publication-statusPublished

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