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Leaf water potential and stomatal conductance of field-grown faba beans (Vicia faba L.) and oats (Avena sativa L.)

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Summary

Faba beans are known to be susceptible to water stress. The aim of the present research was to find out, if this sensitivity is related to an incapability of the plants to close the stomata effectively during times of water stress. For reasons of comparison oats were included in the investigation, as oat plants are known to respond less sensitively to water shortage than faba beans. The experiment was conducted on a loess-derived soil during a relatively dry vegetative season. Leaf area development and soil water use of beans was later in the season as compared to oats. Maximum leaf area and water extraction rates were attained end of June to beginning of July during pod development. Total leaf water potential ι of beans was always higher than in oats. At a given ι the osmotic potential π was less and the pressure (turgor) potential P was higher as compared to the cereal crop. To changing ι beans responded much more pronounced than oats in reducing adaxial and abaxial leaf conductance. The sensitivity in stomata regulation of faba beans became also apparent by a distinct oscillation of ι and conductance during the course of a day. It is concluded that the water-stress susceptibility of faba beans is brought about by a reduced CO2 diffusion into the leaves, thus lowering net assimilation rates.

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Author notes

  1. U. Müller

    Present address: Niedersächsisches Landesamt für Bodenforschung, Postfach 51 01 53, D-3000, Hannover 51, FRG

Authors and Affiliations

  1. Institute of Agronomy and Plant Breeding and Department of Ecology, University of Göttingen, D-3400, Göttingen, FRG

    U. Müller, K. Grimme, C. Meyer & W. Ehlers

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Müller, U., Grimme, K., Meyer, C. et al. Leaf water potential and stomatal conductance of field-grown faba beans (Vicia faba L.) and oats (Avena sativa L.). Plant Soil 93, 17–33 (1986). https://doi.org/10.1007/BF02377142

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  • DOI: https://doi.org/10.1007/BF02377142

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