Photosynthesis of six barley genotypes as affected by water stress

Arnau Gemma, Monneveux Philippe, This Dominique, Alegre L.. 1997. Photosynthesis of six barley genotypes as affected by water stress. Photosynthetica, 33 (11) : 67-76.

Résumé : The effect of water stress on plant water status and net photosynthetic gas exchange (PN) in six barley genotypes (Hordeum vulgare L.) differing in productivity and drought tolerance was studied in a controlled growth chamber. Osmotic adjustment (OA), PN, stomatal conductance (gs), and the ratio intercellular/ambient. CO2 concentration (Ci/Ca) were evaluated at four different levels of soil water availability, corresponding to 75, 35, 25 and 15 % of total available water. Variability in OA capacity was observed between genotypes: the drought tolerant genotypes Albacete and Alpha showed higher OA than drought susceptible genotypes Express and Mogador. The genotype Albacete exhibited also higher PN than the others at low water potential (Ψ). The ratios of PN/gs and Ci/Ca showed that differences in photosynthetic inhibition between genotypes at low Ψ were probably due to nonstomatal effects. In Tichedrett, a landrace genotype with a very extensive root development, OA was not observed, however, it exhibited a capacity to maintain its photosynthetic activity under water stress.

Mots-clés libres : Hordeum vulgare, Net photosynthetic rate, Osmotic adjustment, Osmotic potential, Relative water content, Stomatal conductance, Water potential

Auteurs et affiliations

• Arnau Gemma, ENSAM [Ecole nationale supérieure agronomique de Montpellier] (FRA) ORCID: 0000-0003-0714-6830
• Monneveux Philippe, ENSAM [Ecole nationale supérieure agronomique de Montpellier] (FRA)
• This Dominique, ENSAM [Ecole nationale supérieure agronomique de Montpellier] (FRA)
• Alegre L., Universitat de Barcelona (ESP) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/610033/)

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