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Ferns are less dependent on passive dilution by cell expansion to coordinate leaf vein and stomatal spacing than angiosperms

Citation

Carins Murphy, MR and Jordan, GJ and Brodribb, TJ, Ferns are less dependent on passive dilution by cell expansion to coordinate leaf vein and stomatal spacing than angiosperms, PLoS One, 12, (9) Article e0185648. ISSN 1932-6203 (2017) [Refereed Article]


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DOI: doi:10.1371/journal.pone.0185648

Abstract

Producing leaves with closely spaced veins is a key innovation linked to high rates of photosynthesis in angiosperms. A close geometric link between veins and stomata in angiosperms ensures that investment in enhanced venous water transport provides the strongest net carbon return to the plant. This link is underpinned by "passive dilution" via expansion of surrounding cells. However, it is not known whether this ‘passive dilution’ mechanism is present in plant lineages other than angiosperms and is another key feature of the angiosperms’ evolutionary success. Consequently, we sought to determine whether the ‘passive dilution’ mechanism is; (i) exclusive to the angiosperms, (ii) a conserved mechanism that evolved in the common ancestor of ferns and angiosperms, or (iii) has evolved continuously over time. To do this we first we assessed the plasticity of vein and stomatal density and epidermal cell size in ferns in response to light environment. We then compared the relationships between these traits found among ferns with modelled relationships that assume vein and stomatal density respond passively to epidermal cell expansion, and with those previously observed in angiosperms. Vein density, stomatal density and epidermal cell size were linked in ferns with remarkably similar relationships to those observed in angiosperms, except that fern leaves had fewer veins per stomata. However, plasticity was limited in ferns and stomatal spacing was dependent on active stomatal differentiation as well as passive cell expansion. Thus, ferns (like angiosperms) appear to coordinate vein and stomatal density with epidermal cell expansion to some extent to maintain a constant ratio between veins and stomata in the leaf. The different general relationships between vein density and stomatal density in ferns and angiosperms suggests the groups have different optimum balances between the production of vein tissue dedicated to water supply and stomatal tissue for gas exchange.

Item Details

Item Type:Refereed Article
Keywords:xylem, stomata, ferns, angiosperms, development, water balance
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Plant Developmental and Reproductive Biology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:Carins Murphy, MR (Miss Madeline Carins-Murphy)
Author:Jordan, GJ (Associate Professor Greg Jordan)
Author:Brodribb, TJ (Dr Tim Brodribb)
ID Code:122316
Year Published:2017
Funding Support:Australian Research Council (DP120101686)
Deposited By:Office of the School of Biological Sciences
Deposited On:2017-11-09
Last Modified:2017-11-14
Downloads:0

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