Foliar salt spray exclusion and tissue tolerance underlie local adaptation to oceanic salt spray
Plunkert, M.; Durant, P. C.; Egeler, K.; Lowry, D.
Show abstract
O_LISurviving under oceanic salt spray is critical for plants in coastal ecosystems, yet the mechanisms of coastal plant resilience to salt spray are not well understood. Here, we investigate mechanisms of salt spray adaptation by comparing five latitudinal pairs of monkeyflower accessions locally adapted to coastal and inland habitats. C_LIO_LIWe measured sodium levels in coastal and inland leaves exposed to experimental salt spray in the lab, and compared leaf surface traits that may contribute to differences in sodium uptake between ecotypes. C_LIO_LICoastal monkeyflowers take up less sodium through the leaf surface under experimental salt spray, which may contribute to local adaptation under oceanic salt spray in coastal habitats. Higher water content per unit leaf area and less water loss under salt spray further reduce sodium concentrations in salt-sprayed coastal leaves compared to inland counterparts. C_LIO_LIOur results suggest that plant adaptation to coastal habitats may often involve the evolution of multiple mechanisms to survive stress imposed by oceanic salt spray. C_LI
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