biologia plantarum

International journal on Plant Life established by Bohumil Nìmec in 1959

Biologia plantarum 54:285-292, 2010 | DOI: 10.1007/s10535-010-0050-y

Influence of water stress on photosynthetic characteristics in barley plants under ambient and elevated CO2 concentrations

A. Robredo1, U. Pérez-López1, M. Lacuesta2, A. Mena-Petite1,*, A. Muñoz-Rueda1
1 Departamento de Biología Vegetal y Ecología, Facultad de Ciencia y Tecnología, Universidad del País Vasco/EHU, Bilbao, Spain
2 Departamento de Biología Vegetal y Ecología, Facultad de Farmacia, Universidad del País Vasco/EHU, Vitoria-Gasteiz, Spain

We evaluated the combined effects of elevated CO2 and water availability on photosynthesis in barley. Soil and plant water content decreased with water stress, but less under elevated CO2 concentration (EC) compared with ambient CO2 concentration (AC). During water stress, stomatal conductance, carboxylation rate, RuBP regeneration, and the rate of triose phosphate utilisation (TPU) were decreased but less when plants grew under EC. Drought treatments caused only a slight effect on maximum photochemical efficiency (variable to maximum fluorescence ratio, Fv/Fm), whereas the actual quantum yield (ΦPS2), maximum electron transport rate (Jmax) and photochemical quenching (qP) were decreased and the non photochemical quenching (NPQ) was enhanced. Under water deficit, the allocation of electrons to CO2 assimilation was diminished by 49 % at AC and by 26 % at EC while the allocation to O2 reduction was increased by 15 % at AC and by 12 % at EC.

Keywords: climate change; drought; electron transport allocation; Hordeum vulgare; photochemical efficiency; quantum yield
Subjects: barley; carboxylation efficiency; chlorophyll fluorescence; CO2 concentration, internal; CO2 concentration, elevated; electron transfer rate; Hordeum vulgare; osmotic potential; photosynthetic rate; quantum yield; relative water content (RWC); respiration; stomatal conductance; stress resistance; water potential; water stress

Received: July 14, 2008; Accepted: December 5, 2008; Published: June 1, 2010  Show citation

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Robredo, A., Pérez-López, U., Lacuesta, M., Mena-Petite, A., & Muñoz-Rueda, A. (2010). Influence of water stress on photosynthetic characteristics in barley plants under ambient and elevated CO2 concentrations. Biologia plantarum, 54(2), 285-292. doi: 10.1007/s10535-010-0050-y
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