Genetic canalization of nutrient resorption: evidence from a widespread grass under effective salt stress

Summary

This common garden study of 110 genotypes of the cosmopolitan grass Phragmites australis demonstrates that nutrient resorption efficiency is evolutionarily canalized rather than plastically responsive to salinity stress. Despite strong multi-level stress responses (>60% biomass loss, 3–5-fold sodium accumulation, and 484 differentially accumulated metabolites), nutrient resorption remained stable and was instead determined by phylogeographic lineage, ecotype, and latitude of origin. The findings suggest that predictions of nutrient cycling under global environmental change must account for the genetic and geographic composition of plant populations.

Regional applicability

The study was conducted on a cosmopolitan grass species but provides no explicit geographic location for the research. Phragmites australis is widely distributed across temperate regions including the United Kingdom, where it is common in wetlands and salt marshes, making these findings potentially relevant to UK salt-marsh and wetland management; however, transferability depends on whether UK populations' phylogeographic lineages were represented in the experimental genotype set.

Key measures

Nutrient resorption efficiency (NuRE); above-ground biomass; leaf sodium accumulation; metabolite differential accumulation (484 metabolites); element-specific resorption patterns (nitrogen, phosphorus, potassium)

Outcomes reported

The study measured nutrient resorption efficiency (NuRE) and metabolite accumulation in 110 genotypes of Phragmites australis under imposed salinity stress. It found that NuRE remained largely unaffected by salinity but was strongly correlated with phylogeographic lineage, ecotype, and latitude of origin, with element-specific regulatory patterns evident across nitrogen, phosphorus, and potassium.

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