Journal
PHOTOSYNTHETICA
Volume 44, Issue 1, Pages 143-146Publisher
ACAD SCI CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.1007/s11099-005-0171-2
Keywords
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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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 F-v/F-m 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.
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