Pigments and photosynthesis of understory grasses: Light irradiance and soil moisture effects

Pigments and photosynthesis of understory grasses: Light irradiance and soil moisture effects Phleum alpinum L. and Poa pratensis L. are major forage species that often grow in various environments in Tierra del Fuego, Argentina. We performed a greenhouse experiment to investigate how these species acclimate to the different irradiance of the microenvironments where they grow. Both grass species were exposed to three levels of incident irradiance (I4: 4%; I26: 26%, or I64: 64% of ambient sunlight) and two levels of soil moisture content (M30: 30–50% or M60: 60–80% of field capacity) under greenhouse conditions. As irradiance levels increased, the contents of chlorophyll per unit surface area and fresh weight basis increased, and the chlorophyll a/b and carotenoids/chlorophyll ratio also increased. Maximum photosynthetic rate and the light compensation point increased with increasing light availability. Values for these variables varied with time. However, the relationship of these values was not modified in P. alpinum between the irradiance treatments. Contrarily, temporal changes of those variables showed that the maximum photosynthetic rate was similar to that in March in all treatments in P. pratensis. Results indicated that P. alpinum and P. pratensis were able to acclimate to the various experimental environments. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Pigments and photosynthesis of understory grasses: Light irradiance and soil moisture effects

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Publisher
Pleiades Publishing
Copyright
Copyright © 2016 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Plant Physiology; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1134/S1021443716020126
Publisher site
See Article on Publisher Site

Abstract

Phleum alpinum L. and Poa pratensis L. are major forage species that often grow in various environments in Tierra del Fuego, Argentina. We performed a greenhouse experiment to investigate how these species acclimate to the different irradiance of the microenvironments where they grow. Both grass species were exposed to three levels of incident irradiance (I4: 4%; I26: 26%, or I64: 64% of ambient sunlight) and two levels of soil moisture content (M30: 30–50% or M60: 60–80% of field capacity) under greenhouse conditions. As irradiance levels increased, the contents of chlorophyll per unit surface area and fresh weight basis increased, and the chlorophyll a/b and carotenoids/chlorophyll ratio also increased. Maximum photosynthetic rate and the light compensation point increased with increasing light availability. Values for these variables varied with time. However, the relationship of these values was not modified in P. alpinum between the irradiance treatments. Contrarily, temporal changes of those variables showed that the maximum photosynthetic rate was similar to that in March in all treatments in P. pratensis. Results indicated that P. alpinum and P. pratensis were able to acclimate to the various experimental environments.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Apr 1, 2016

References

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