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Photosynthetic Responses of Beans to Water Stress in the Field

  • C Pastenes
  • VH Porter
  • C. Baginsky
  • P. Horton
Chapter

Abstract

Under water stress plants decrease their growth rate, first because of a decrease in their assimilatory surface and, second, because the photosynthetic rate is inhibited (Lawlor and Uprety, 1993). CO2 reaches the carboxilation sites through stomata, the same than water lost, therefore as an attempt to save water under drought conditions, the stomatal closure affects photosynthesis by limiting CO2 availability (Mansfield 1990). Also, water stress restricts photosynthesis through “non-stomatal” effects, among which PSII and ATP synthase inhibition in thylakoids are thought to be important (Boyer, 1977; Boyer and Younis, 1983). Non-stomatal effects are believed to occur mainly because CO2 shortages would induce an over-excitation of PSII complexes, which in time, and depending on the capacity for absorbed energy dissipation as heat, would induce inhibition of photosynthesis. This water induced inhibition of PSII activity is light dependent, and therefore recognised as photoinhibition.

Key words

drought stress environmental stress fluorescence gas exchange photoinhibition 

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4. Bibliography

  1. Boyer JS, 1977. In Water deficit and photosynthesis. pp 153–190Google Scholar
  2. Boyer JS and Younis HM, 1983. In Effect of Stress on photosynthesis pp 29–33.CrossRefGoogle Scholar
  3. Lawlor DW and Uprety DC 1993. In. Photosynthesis, photoreactions to plant productivity.Google Scholar
  4. Mansfield TA, Hetherington AM, Atkinson CJ 1990. Ann. Rev. Plant Physiol. 41: 55–75CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 1998

Authors and Affiliations

  • C Pastenes
    • 1
  • VH Porter
    • 1
  • C. Baginsky
    • 1
  • P. Horton
    • 2
  1. 1.Facultad de Ciencias Agrarias y ForestalesUniversidad de Chile. CasillaSantiagoChile
  2. 2.Robert Hill InstituteUniversity of SheffieldSheffieldUK

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