engleski

The effect of heat stress on photosynthetic efficiency in Ginko biloba L. and Liriodendron tulipifera L

Ginko biloba and Liriodendron tulipifera can be found in urban environments as a street trees and park trees. Solitary street trees in city centers, compared to trees from city parks, which grow in community with other species, can have different response to stress conditions. The aim of this work was to investigate and compare photosynthetic performance of two species subjected to heat stress. After dark adaptation of plants for 24 h, leaf disc were exposed to varying temperatures (25°C, 30°C, 40°C and 50°C) in a water bath for 10 minutes. Results showed that overall vitality index (PIabs) decreased with higher temperature in both plant species, with Ginko biloba being more tolerant in comparison to Liriodendron tulipifera. Ginko plants growing in streets, as opposed to park, exhibited higher tolerance to increased temperature while Liriodendron showed the opposite pattern. Changes of ratio of trapping excitons and dissipation (TR0/DI0), and of electron transport beyond primary acceptor QA- (ET0/(TR0-ET0)) were shown to be the main reason for the observed differences in PIabs between two species. The selection and use of suitable tree species present important elements in a successful urban landscaping. City’s visual appearance depends on the choice of plant species that could be adapted to urban environmental conditions.

Ginko biloba, Liriodendron tulipifera, photosynthetic performance, heat stress

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