Еxperimental test of net photosynthetic light-response curves in estimating of photosynthetic activity by the example of ornamental plants

 
PIIS250026270001827-4-1
DOI10.31857/S250026270001827-4
Publication type Article
Status Published
Authors
Affiliation: Nikita Botanical Gardens – National Scientific Center RAS
Address: Russian Federation
Affiliation: Nikita Botanical Gardens – National Scientific Center RAS
Address: Russian Federation
Affiliation: Nikita Botanical Gardens – National Scientific Center RAS
Address: Russian Federation
Journal nameRossiiskaia selskokhoziaistvennaia nauka
EditionNumber 6
Pages25-32
Abstract

Comparative estimation of CO gas exchange in leaves of four ornamental species: Nerium oleander L., Laurus nobilis L., Aucuba 2 japonica variegata Thunb. and Melissa officinalis L., grown under ambient and greenhouse conditions on the Southern coast of the Crimea and the Black Sea coast of the Caucasus was carried out. The results fitted by modified rectangular hyperbola model able to fit the photoinhibition stage nonrectangular hyperbola and modified form nonrectangular hyperbolic model showed highly adequate values to real dependencies of photosynthetic rate on light intensity for N. oleander, L. nobilis, A. japonica variegata and M. officinalis. In similar environmental conditions the measurement of CO gas exchange in leaves showed significant differences in the 2 parameters of PN/I-curves: the light compensation point (LCP), photosynthetic and dark respiration rate, saturation irradiance and quantum yield. The highest of photosynthesis rate was observed in N. oleander, the lowest – in A. japonica variegata with the light saturation point at a very low PAR level. Lower values of LCP and saturation constants in L. nobilis and A. japonica variegata indicate effective utilization by them of low values of solar radiation, allowing them to survive under the conditions of strong shadow.

KeywordsPN/I-curves, СО gas exchange, curve fitting, 2 nonlinear regression, ornamental plants
Received18.12.2018
Publication date18.12.2018
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