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Light Environment and Pigment Composition of Megaceros Pellucidus

journal contribution
posted on 2023-05-17, 11:16 authored by Watkins, RLS, Outred, HA, Rowland, RE, Brown, SC
The hornwort Megaceros pellucidus occupies wet, heavily shaded sites. In four sites in the central North Island of New Zealand the maximum photon flux density (PFD) was always less than 10 ìmol m-2 s-1. The PFD varied weakly during the day depending exponentially on the PFD of full sunlight. Light reflected from surface water late in the day transiently doubled the mid-day maximum PFD. Sunflecks had little impact on the site PFD consistent with the exponential relationship between the PFDs measured at the site and canopy. Plants from low light conditions (0.2 ìmol m-2 s-1) had the same carotenoid content as plants from higher light conditions (6.9 ìmol m-2 s-1), but the chlorophyll content of high light plants was approximately twice that of low light plants. The chlorophyll a/b ratio was the same for plants from low and high light conditions. Spectra of acetone-extracts of M. pellucidus thallus from low light grown plants showed an absorbance band at about 340 nm that was not apparent in spectra of extracts from plants grown in high light conditions.

History

Publication title

Extreme Life, Biospeology and Astrobiology

ISSN

2067-6360

Department/School

School of Health Sciences

Publisher

Bioflux SRL

Place of publication

Romania

Rights statement

Copyright 2011 Extreme Life, Biospeology & Astrobiology

Repository Status

  • Restricted

Socio-economic Objectives

Terrestrial biodiversity

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