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We studied growth and photosynthesis of cucumber () seedlings under two vapor-pressure deficit levels (VPD; 0.4 and 3.0 kPa), two salinity levels (0 mM and 34 mM NaCl), and two CO concentrations ([CO]; 400 and 1,000 μmol mol). Relative growth rate (RGR) decreased with increasing VPD, but the causal factor differed between salinity levels and CO concentrations. Under ambient [CO], RGR decreased with increasing VPD at low salinity mainly due to decreased leaf area ratio (LAR), and decreased net assimilation rate (NAR) at high salinity. The decrease in intercellular [CO] () with decreasing stomatal conductance caused by high VPD did not significantly limit net photosynthetic rate () at low salinity, but  was potentially limited by  at high salinity. At high [CO], high VPD reduced LAR, but did not affect NAR. This is because the decrease in  occurred where slope of – curve was almost flat.

photosynthetica

Effects of the interaction between vapor-pressure deficit and salinity on growth and photosynthesis of Cucumis sativus seedlings under different CO&lt;sub&gt;2&lt;/sub&gt; concentrations