Summary
Plants of two populations of Diplacus aurantiacus, a subshrub of the Californian chaparral, were compared for their stomatal response to water vapor concentration gradients. Plants of a coastal and an interior population were compared when grown under both low and high humidities. When grown at high humidity the coastal plants exhibited higher conductances and higher transpiration/photosynthesis ratios at all leaf-to-air water vapor concentration gradients than did the interior plants. Although all of the plants examined showed a pronounced stomatal response to humidity the response did not result in the degree of regulation of water-use efficiency reported for other Californian coastal species.
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Mooney, H.A., Chu, C. Stomatal responses to humidity of coastal and interior populations of a Californian shrub. Oecologia 57, 148–150 (1983). https://doi.org/10.1007/BF00379572
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DOI: https://doi.org/10.1007/BF00379572