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Photosynthetic Adaptation to Light Intensity in Sakhalin Knotweed (Polygonum sachalinense)

Published online by Cambridge University Press:  12 June 2017

David T. Patterson ,
David J. Longstreth  and
Mary M. Peet
David T. Patterson
Affiliation:
Dep. Botany, Duke Univ., Durham, NC 27706
David J. Longstreth
Affiliation:
Dep. Botany, Duke Univ., Durham, NC 27706
Mary M. Peet
Affiliation:
Dep. Botany, Duke Univ., Durham, NC 27706
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Abstract

The capacity for photosynthetic acclimation to light intensity in Sakhalin knotweed (Polygonum sachalinense F. Schmidt) was studied by growing plants in four light environments [out-of-doors in full sun and under 50% shade, and in a growth chamber at 800 μE m2 sec-1 photosynthetically active radiation, 400 to 700 nm (PAR) and 150 μE m-2 sec-1 PAR], and then determining, with an infrared gas analyzer (IRGA), the photosynthetic rates of single leaves exposed to a range of light intensities from 100 to 2000 μE m2 sec-1 PAR. The plants grown in high light had higher photosynthetic rates throughout the range of 100 to 2000 μE M-2 sec-1 PAR. Maximum photosynthetic rates were 37 mg CO2 dm-2 h-1 for plants grown in full sun out-of-doors and 16.5 mg CO2 dm-2 h-1 for plants grown in low light in the growth chamber. There was no indication of positive adaptation to low light intensity in Sakhalin knotweed. Differences in light-saturated photosynthetic rates were closely related to differences in mesophyll conductance and chlorophyll content per unit leaf area.

Type
Research Article
Information
Weed Science , Volume 25 , Issue 4 , July 1977 , pp. 319 - 323
Copyright
Copyright © 1977 by the Weed Science Society of America 

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