Stomata in bryophytes

Stomata and atmospheric CO₂ in bryophytes

BY ANNALS OF BOTANY OFFICE

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Stomatal abund­ance has been widely used to recon­struct palaeo-atmospheres, but there is a view that early-diverging clades of vas­cu­lar land plants may dif­fer in their respons­ive­ness to atmo­spheric CO₂. Field et al. grow a num­ber of horn­worts and moss sporo­phytes with con­trast­ing sto­matal mor­pho­lo­gies under dif­fer­ent atmo­spheric CO₂ con­cen­tra­tions rep­res­ent­ing both cur­rent and ancient atmo­spheres, and find that dens­it­ies and dimen­sions are mostly unaf­fected by changes in CO₂.

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