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Publication Type J
Authors Wang, L. W., A. M. Showalter and I. A. Ungar
Title Effects of intraspecific competition on growth and photosynthesis of Atriplex prostrata
Source Aquatic Botany
Author Keywords Atriplex prostrata; density; growth inhibition; halophytes; intraspecific competition; photosynthesis monocultures; density; triangularis; populations; salinity
Abstract We investigated the effect of intraspecific competition on growth parameters and photosynthesis of the salt marsh species Atriplex prostrata Boucher in order to distinguish the effects of density-dependent growth inhibition from salt stress. High plant density caused a reduction of 30% in height, 82% in stem dry mass, 80% in leaf dry mass, and 95% in root dry mass. High density also induced a pronounced 72% reduction in leaf area, 29% decrease in length of mature internodes and 50% decline in net photosynthetic rate. The alteration of net photosynthesis paralleled growth inhibition, decreasing from 7.6 +/- 0.9 mu mol CO2 m(-2) s(-1) at low density to 3.5 +/- 0.4 mu mol CO2 m(-2) s(-1) at high density, indicating growth inhibition caused by intraspecific competition is mainly due to a decline in net photosynthesis rate. Plants grown at high density also exhibited a reduction in stomatal conductance from 0.7 +/- 0.1 mol H2O m(-2) s(-1) at low density to 0.3 +/- 0.1 mol H2O m(-2) s(-1) at high density and a reduction in transpiration rate from 6.0 +/- 0.3 mmol H2O M-2 s(-1) at low density to 4.3 +/- 0.3 mmol H2O m(-2) s(-1) at high density. Biomass production was inhibited by an increase in plant density, which reduced the rate of photosynthesis, stomatal conductance and leaf area of plants. (c) 2005 Elsevier B.V. All rights reserved.
Author Address Ohio Univ, Dept Environm & Plant Biol, Athens, OH 45701 USA. Ohio Univ, Mol & Cellular Biol Program, Athens, OH 45701 USA. Ungar, IA, 44 Walker St, Athens, OH 45701 USA. ungar@ohio.edu
29-Character Source Abbreviation Aquat. Bot.
Publication Date Nov
Year Published 2005
Volume 83
Issue 3
Beginning Page 187-192
Unique Article Identifier ISI:000232564100003
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