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Photosynthetica

, 44:143 | Cite as

Photosynthetic responses and proline content of mature and young leaves of sunflower plants under water deficit

  • I. Cechin
  • S. C. Rossi
  • V. C. Oliveira
  • T. F. Fumis
Brief Communication

Abstract

In mature and young leaves of sunflower (Helianthus annuus L. cv. Catissol-01) plants grown in the greenhouse, photosynthetic rate, stomatal conductance, and transpiration rate declined during water stress independently of leaf age and recovered after 24-h rehydration. The intercellular CO2 concentration, chlorophyll (Chl) content, and photochemical activity were not affected by water stress. However, non-photochemical quenching increased in mature stressed leaves. Rehydration recovered the levels of non-photochemical quenching and increased the Fv/Fm in young leaves. Drought did not alter the total Chl content. However, the accumulation of proline under drought was dependent on leaf age: higher content of proline was found in young leaves. After 24 h of rehydration the content of proline returned to the same contents as in control plants.

Additional key words

chlorophyll drought intercellular CO2 concentration leaf water potential non-photochemical quenching photochemical activity rehydration stomatal conductance to water vapour transpiration rate 

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Copyright information

© Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Praha 2006

Authors and Affiliations

  • I. Cechin
    • 1
  • S. C. Rossi
    • 1
  • V. C. Oliveira
    • 1
  • T. F. Fumis
    • 1
  1. 1.Department of Biology, Faculty of ScienceSao Paulo State UniversityBauru-SPBrazil

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