Photosynthetic inhibitory activity of dihydro-?-agarofurans sesquiterpenes from Maytenus disticha and Maytenus boaria (Celastraceae)

Cespedes, C; Achnine, L; Lotina-Hennsen, B; Alarcon J.; Becerra, J.

Keywords: electron, growth, inhibition, phosphorylation, sesquiterpene, plant, structure, photosynthesis, chloroplast, photoactivation, chemical, Transfer, Maytenus, disticha, boaria

Abstract

The effects of 9?-benzoyloxy-1?, 2?, 6?, 8?, 15-pentaacetoxy-dihydro-?-agarofuran and 9?-furoyloxy-1?, 6?, 8?-triacetoxy-dihydro-?-agarofuran, major phytogrowth inhibitors isolated from the aerial parts of Maytenus disticha (Celastraceae) and seeds of Maytenus boaria (Celastaraceae), respectively, on different photosynthetic activities of isolated spinach chloroplasts have been investigated. Photophosphorylation and electron transport (basal, phosphorylating and uncoupled) were inhibited in a concentration dependent manner by both compounds, therefore acting as Hill reaction inhibitors. The site of action of these natural compounds was located in the span from P680 to Q(A). 9?-benzoyloxy-1,2,6,8,15-pentaacetoxy-dihydro-?-agarofuran was one order of magnitude more potent (I50 = 2.6 ?M) than 9?-furoyloxy-1,6,8,-triacetoxydihydro-?-agarofuran, suggesting that the substitution at C-9 and the acetoxy groups at carbons 2 and 15 are important structural requirements for the displayed inhibitory activity.

Más información

Título según SCOPUS: Photosynthetic inhibitory activity of dihydro-?-agarofurans sesquiterpenes from Maytenus disticha and Maytenus boaria (Celastraceae)
Título de la Revista: ZEITSCHRIFT FUR NATURFORSCHUNG SECTION C-A JOURNAL OF BIOSCIENCES
Volumen: 55
Número: 07-ago
Editorial: WALTER DE GRUYTER GMBH
Fecha de publicación: 2000
Página de inicio: 631
Página final: 637
Idioma: English
URL: http://www.scopus.com/inward/record.url?eid=2-s2.0-17544404586&partnerID=q2rCbXpz
Notas: SCOPUS