Ecophysiological responses of perennial grasses Stipa lagascae and Dactylis glomerata under soil water deficit
2008
Jaballah, S.; Gribaa, A.; Ferchichi, A., Institut des Régions Arides, Medenine (Tunisia) | Volaire, F., Institut National de Recherche Agronomique, Montpellier (France). Laboratoire d'Ecophysiologie des Plantes sous Stress Environnementaux
Perennial herbaceous plants represent one of the most interesting resources but their persistence depends on their ability to cope with acute drought. Survival of plants under extreme conditions must therefore be studied to understand the strategies and mechanisms of perennial grasses from arid areas. The aim of the present study was to compare the adaptive responses of both species Stipa lagascae (cultivar Roemer and Schultz) and Dactylis glomerata (cultivar Kasbah). We analysed the impact of water deficit on phenology and growth through some physiological traits. We were particularly interested in the study of the assimilation rate "A" (µmol per m2 per s) and the stomatal conductance "gs" (mol per m2 per s). The results show that water deficit affects the biological cycle and that there is a difference between species. At the physiological level, assimilation rate "A" (µmol per m2 per s) is significantly affected (P less than 0.01) by water deficit for Dactylis glomerata. For Stipa lagascae, the assimilation rates in favourable conditions and under water deficit are comparable
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