We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Plant leaf surface as a sensory system in allelopathic relations: 1. Role of azulenes.
- Authors
Roshchina, V. V.
- Abstract
The components of leaf surface sensory systems were considered as the acceptor of external signals- allelochemicals. The role of blue natural azulenes -antioxidants in plant life was studied on two models. First model used bluish and silver leaves of 5-woody species [Buddleja davidii Franch (Buddlejaceae), Cedrus atlantica (Endl.) Manetti ex, Carrière cv. Argentea (Pinaceae), Eucalyptus cinerea F. Muell. Ex. Benth (Myrtaceae), Picea pungens Engelm. cv. Argentea- (Pinaceae), and Pinus parviflora Siebold& Zucc. cv. Glauca (Pinaceae)] for microscopic analysis of their surface by transmitted light of microscope and microspectrophotometer/ microfluorimeter. The microscanning of leaf surface by these techniques showed the azulene-containing wax plates. The presence of azulenes also showed the absorbance spectra of surface with characteristic maximum of 580 and 607 nm, which was also seen in the ethanol or acetone extracts of blue pigments. Their emission was seen in blue laser-scanning confocal microscope and was similar to artificial base azulene. Second model-isolated the chloroplasts from leaves of Kalanchoe pinnata (Lam.) Pers. (family Crassulaceae) with little chlorophyll content, without natural azulenes-was used for experiments to determine the effects of exogenous synthetic azulene on photochemical activity, because earlier some blue pigments were found in chloroplasts of some species of Fabaceae (Leguminosae). Photoreduction of NADP+, potassium ferricyanide and dichlorophenol indophenol with or without inhibitors diuron or antimycin A in the reaction medium stimulated with azulene. Accordingl to redox-potential, it may be electrons donor in electron transport chain at the level of cytochrome f-plastocyanin. Blue pigment interaction with these isolated electron carriers lost its colour. Both models demonstrated that azulenes being antioxidants, may be defence components out side the cell (on the surface) and within the cell (in chloroplasts) to form reactive oxygen species with allelochemicals to prevent damages.
- Publication
Allelopathy Journal, 2023, Vol 59, Issue 2, p109
- ISSN
0971-4693
- Publication type
Academic Journal
- DOI
10.26651/allelo.j/2023-59-2-1435