Publicação: Photosynthetic responses and proline content of mature and young leaves of sunflower plants under water deficit
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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 CO 2 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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Chlorophyll, Drought, Intercellular CO 2 concentration, Leaf water potential, Non-photochemical quenching, Photochemical activity, Rehydration, Stomatal conductance to water vapour, Transpiration rate, Helianthus, Helianthus annuus
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Inglês
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Photosynthetica, v. 44, n. 1, p. 143-146, 2006.
