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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2004

Autores

Santos, CV (Autor) Outra

Revista

Título: Scientia Horticulturae

Vol. 103

Páginas: 93-99

ISSN: 0304-4238

Editora: Elsevier

Indexação

ISI Web of Knowledge - 312 Citações

Scopus - 375 Citações

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7