Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Adaptation to shade of the light‐harvesting apparatus in Silene dioica

Adaptation to shade of the light‐harvesting apparatus in Silene dioica Abstract. The physiological characteristics and photo‐system composition of the photosynthetic apparatus of Silene dioica, a woodland plant, grown in sun and natural shade are examined. As expected, shade leaves exhibited lower chlorophyll a/b ratios, light saturated rates of CO2 assimilation (Asat), dark respiration (Rd,) and light compensation points (Г), with both sun and shade leaves having similar absorptances and quantum yields of CO2 assimilation (φ). Shade leaves were able to utilize far‐red light for electron transport and carbon assimilation and reach the compensation point. Sun leaves in far‐red light had a rate of carbon assimilation equivalent to their dark respiration rate. Chlorophyll fluorescence kinetics from leaves at 77 K together with analyses of thylakoid contents of photosystems (PS) I and II and the light‐harvesting cholorphyll a/b protein complex associated with PSII (LHCII) demonstrated that the antenna size of PSII was similar in thylakoids of sun and shade leaves, but shade leaves contained ca. 20% more PSII and ca. 12% less PSI complexes. The increased PSII/PSI ratio in shade leaves accounted for their ability to achieve the compensation point in far‐red light. An important feature of photosynethic shade adaptation in S. dioica is an increase in the PSII/PSI ratio and not an increase in the antenna size of PSII. The adaptive response of sun leaves when placed in a shade environment was rapid and had a half‐time of ca. 18h. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Cell & Environment Wiley

Adaptation to shade of the light‐harvesting apparatus in Silene dioica

Plant Cell & Environment , Volume 14 (2) – Mar 1, 1991

Loading next page...
 
/lp/wiley/adaptation-to-shade-of-the-light-harvesting-apparatus-in-silene-dioica-OBeBsO5S4T

References (44)

Publisher
Wiley
Copyright
Copyright © 1991 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0140-7791
eISSN
1365-3040
DOI
10.1111/j.1365-3040.1991.tb01337.x
Publisher site
See Article on Publisher Site

Abstract

Abstract. The physiological characteristics and photo‐system composition of the photosynthetic apparatus of Silene dioica, a woodland plant, grown in sun and natural shade are examined. As expected, shade leaves exhibited lower chlorophyll a/b ratios, light saturated rates of CO2 assimilation (Asat), dark respiration (Rd,) and light compensation points (Г), with both sun and shade leaves having similar absorptances and quantum yields of CO2 assimilation (φ). Shade leaves were able to utilize far‐red light for electron transport and carbon assimilation and reach the compensation point. Sun leaves in far‐red light had a rate of carbon assimilation equivalent to their dark respiration rate. Chlorophyll fluorescence kinetics from leaves at 77 K together with analyses of thylakoid contents of photosystems (PS) I and II and the light‐harvesting cholorphyll a/b protein complex associated with PSII (LHCII) demonstrated that the antenna size of PSII was similar in thylakoids of sun and shade leaves, but shade leaves contained ca. 20% more PSII and ca. 12% less PSI complexes. The increased PSII/PSI ratio in shade leaves accounted for their ability to achieve the compensation point in far‐red light. An important feature of photosynethic shade adaptation in S. dioica is an increase in the PSII/PSI ratio and not an increase in the antenna size of PSII. The adaptive response of sun leaves when placed in a shade environment was rapid and had a half‐time of ca. 18h.

Journal

Plant Cell & EnvironmentWiley

Published: Mar 1, 1991

There are no references for this article.