RT Journal Article
SR Electronic
A1 OLIVEIRA, M.F.
A1 MARENCO, R.A.
T1 Photosynthesis and biomass accumulation in Carapa surinamensis (Meliaceae) in response to water stress at ambient and elevated CO&lt;sub&gt;2&lt;/sub&gt;
JF Photosynthetica
YR 2019
VO 57
IS 1
SP 137
OP 146
DO 10.32615/ps.2019.023
UL https://ps.ueb.cas.cz/artkey/phs-201901-0017.php
AB Climate models predict an increase in atmospheric CO&lt;sub&gt;2&lt;/sub&gt; concentration and prolonged droughts in some parts of the Amazon, but the effect of elevated CO&lt;sub&gt;2&lt;/sub&gt; is still unknown. Two experiments (ambient CO&lt;sub&gt;2&lt;/sub&gt; ‒ 400 ppm and elevated CO&lt;sub&gt;2&lt;/sub&gt; ‒ 700 ppm) were conducted to assess the effect of drought (soil at 50% field capacity) on physiological parameters of Carapa. At ambient CO&lt;sub&gt;2&lt;/sub&gt; concentration, light-saturated net photosynthetic rate (P&lt;sub&gt;Nsat&lt;/sub&gt;) was reduced by 33.5% and stomatal conductance (g&lt;sub&gt;s&lt;/sub&gt;) by 46.4% under drought, but the effect of drought on P&lt;sub&gt;Nsat&lt;/sub&gt; and g&lt;sub&gt;s&lt;/sub&gt; was nullified at elevated CO&lt;sub&gt;2&lt;/sub&gt;. Total plant biomass and leaf area production were also reduced (42‒47%) by drought. By changing leaf traits, Carapa is able to endure drought, as the consumptive use of water was reduced under drought (32‒40%). The improvement of P&lt;sub&gt;Nsat&lt;/sub&gt; under elevated CO&lt;sub&gt;2&lt;/sub&gt; and water stress and the leaf plasticity of Carapa broaden our understanding of the physiology of Amazonian trees.