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Responses to Water Stress in Wheat and Related Wild Species¹

Various indices of drought resistance were studied in wheat (Triticum aestivum, ‘Chinese Spring’ and ‘Seeon’) and three related wild species (T, longissimum, T. kotschyi, and Agropyrum junceum) grown in containers in a glasshouse. A. gropyrum junceum (a halophytic perennial) maintained a constant CO₂ fixation rate (measured by a ¹⁴CO₂-pulse method) down to a leaf water potential of –3.0 MPa (measured by the pressure chamber method). Among the three Triticum species, T. kotschyi (a desert annual) ranked highest and wheat ranked lowest in: a) the ability to maintain high leaf water potential as the soil dried; and b) the ability to maintain high stomatal aperture (measured by means of air-flow porometer), high CO₂ fixation rate, and high relative water content with decreasing leaf water potential. The recovery of stomatal aperture following a period of water stress and rewatering was fastest in T. longissimum (an annual of semiarid to subhumid habitats), somewhat slower in T. kotschyi and much slower in wheat.

Key Words: Triticum species • Agropyrum junceum • Drought resistance • Water stress • CO₂ fixation

Received for publication February 10, 1981.