Regulation of chlorophyll biosynthesis and degradation by salt stress in sunflower leaves

• Type: Article in International Scientific Journal
• Date: 2004

Authors

Santos, CV (Author) Other

Journal

Title: Scientia Horticulturae

Vol. 103

Pages: 93-99

ISSN: 0304-4238

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 312 Citations

Scopus - 375 Citations

Other information

Authenticus ID: P-000-793

DOI: 10.1016/j.scienta.2004.04.009

Abstract (EN): Helianthus annuus L. plants when exposed to increasing concentrations of NaCl showed a reduction of chlorophyll content and fluorescence (mainly due to a reduction of Fm). Chlorophyllase activity was higher in 15-day-old unstressed leaves. It increased during the first days in 25 mM NaCl stressed leaves decreasing with higher concentrations. NaCl effect on chlorophyll synthesis was then studied: only 50 and 100 mM NaCl inhibited synthesis of 5-aminolaevulinic acid, a precursor of chlorophyll. Our results show that: (1) chlorophyllase is stimulated during the first days in leaves under moderate stress but it is affected by high salt concentrations; (2) salt stress affects more drastically chlorophyll synthesis (decreasing ALA synthesis) than chlorophyllase-mediated degradation.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7