Physiological responses of six bread wheat and durum wheat genotypes to water stress |
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Authors: | C Seropian C Planchon |
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Institution: | (1) Photosynthèse et Amélioration des Plantes, École Nationale supérieure Agronomique, 145 avenue de Muret, 31076 Toulouse Cédex, France |
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Abstract: | Summary The responses of six wheat genotypes to water stress were analysed. Soil moisture (H), leaf water potential ( w), photosynthesis (PN), stomatal resistance (rs) and transpiration (T) were measured during a water stress. The genotypes investigated differed in their stress avoidance ( w-H relationship) and their stress tolerance (PN- w and rs- w relationships). The most important differences observed concern the mechanisms of tolerance at low leaf water potential: two varieties, Haurani 27 and Baalback, can then maintain a high photosynthetic activity. These observations are in agreement with the drought resistance characteristics already known for these genotypes. Possible applications to wheat breeding are considered |
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Keywords: | Triticum aestivum bread wheat Triticum durum durum wheat water stress photosynthesis stomatal resistance leaf water potential water efficiency breeding |
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