Stomatal density and aperture in non-vascular land plants are non-responsive to above-ambient atmospheric CO2concentrations
| Autor: | Katie J. Field, Jeffrey G. Duckett, Silvia Pressel, Duncan D. Cameron |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Polytrichum
Bryophyta Plant Science Phaeoceros laevis mosses Hornwort hornworts Funaria bryophytes Funaria hygrometrica evolution Botany Phylogeny biology Atmosphere palaeo-atmospheric environment fungi Plant Stomata carbon dioxide Original Articles Anthoceros punctatus Carbon Dioxide biology.organism_classification Moss Polytrichum juniperinum Atmospheric CO2 Mnium hornum Bryophyte stomatal density |
| Zdroj: | Field, K J, Duckett, J G, Cameron, D D & Pressel, S 2015, ' Stomatal density and aperture in non-vascular land plants are non-responsive to above-ambient atmospheric CO 2 concentrations ', Annals of Botany, vol. 115, no. 6, pp. 915–922 . https://doi.org/10.1093/aob/mcv021 |
| ISSN: | 1095-8290 0305-7364 |
| DOI: | 10.1093/aob/mcv021 |
| Popis: | Background and Aims: Following the consensus view for unitary origin and conserved function of stomata across over 400 million years of land plant evolution, stomatal abundance has been widely used to reconstruct palaeo-atmospheric environments. However, the responsiveness of stomata in mosses and hornworts, the most basal stomate lineages of extant land plants, has received relatively little attention. This study aimed to redress this imbalance and provide the first direct evidence of bryophyte stomatal responsiveness to atmospheric CO2.Methods: A selection of hornwort (Anthoceros punctatus, Phaeoceros laevis) and moss (Polytrichum juniperinum, Mnium hornum, Funaria hygrometrica) sporophytes with contrasting stomatal morphologies were grown under different atmospheric CO2 concentrations ([CO2]) representing both modern (440 p.p.m. CO2) and ancient (1500 p.p.m. CO2) atmospheres. Upon sporophyte maturation, stomata from each bryophyte species were imaged, measured and quantified.Key Results: Densities and dimensions were unaffected by changes in [CO2], other than a slight increase in stomatal density in Funaria and abnormalities in Polytrichum stomata under elevated [CO2].Conclusions The changes to stomata in Funaria and Polytrichum are attributed to differential growth of the sporophytes rather than stomata-specific responses. The absence of responses to changes in [CO2] in bryophytes is in line with findings previously reported in other early lineages of vascular plants. These findings strengthen the hypothesis of an incremental acquisition of stomatal regulatory processes through land plant evolution and urge considerable caution in using stomatal densities as proxies for paleo-atmospheric CO2 concentrations. |
| Databáze: | OpenAIRE |
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