Work

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

Year: 2006

Type: article

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.

Source: Photosynthetica

DOI: 10.1007/s11099-005-0171-2

Authors: I. Cechin, S. C. Rossi, V. C. Oliveira, T. F. Fumis

Institution: Universidade Estadual Paulista (Unesp)

Language: English

Topic: Plant Stress Responses and Tolerance

Subfield: Plant Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

SDG: Zero hunger

Open Access status: bronze

Funder: Fundação de Amparo à Pesquisa do Estado de São Paulo