University of Belgrade

Institute for
Multidisciplinary Research

Project information

Regulation of carbon and nitrogen fluxes from the primary to the secondary metabolic pathways in response to high light stress in variegated leaves

Project ID Bilateralni SRB-FRA
Project Title Regulation of carbon and nitrogen fluxes from the primary to the secondary metabolic pathways in response to high light stress in variegated leaves

Project Leader
IMSI Status Manages the project

Financial Source Ministry of Education, Science and Technological Development, Ministère de l\'Europe et des Affaires étrangères, MEAE and Ministère de l\'Enseignement supérieur, de la Recherche et de l\'Innovation, MESRI

Category of Project Bilateral cooperation



Climate changes imply fluctuating and extreme environmental conditions, such as high light intensity, ultraviolet (UV) radiation, low and high temperatures, drought and increased CO2 levels. The effects of these factors on plants are often interrelated and usually result in a disturbed balance between the amount of energy received and the ability to process it, which may cause reduced crop growth and productivity. In order to balance energy input with photosynthetic capacity and prevent photooxidative damage, plants have evolved multiple energy dissipation and photoprotective mechanisms. A hallmark of the plant the acclimation to high light (HL) is accumulation of antioxidants and phenolics (N‐free compounds), which presents additional energy escape valve. Leaf variegation (e.g. in Pelargonium zonale and Plectranthus coleoides plants) has proven to be a suitable model system to examine source–sink interactions in relation to carbon and nitrogen allocation within the same leaf, providing the same microenvironment conditions. We have recently shown that these two metabolically contrasted tissues have distinct response of antioxidative and phenolics’ metabolism to HL and UV‐B radiation. In addition, white tissue of P. zonale is enriched in nitrogenous compounds (e.g. amino acids) and under N deprivation they can be remobilized to green tissue. The aims of the proposed project will be: (i) the evaluation of the impact of white leaf sectors, as an additional sink, for maintaining fitness of variegated morphs (higher photosynthetic efficiency, ameliorated photo‐inhibition, maintaining biomass production) in comparison to plain green morphs under fluctuating light intensities; (ii) testing if differential distribution of C, N, and S in these two leaf tissues has influence on generation of reactive oxygen and reactive nitrogen species under HL exposure. The obtained results should contribute to better understanding of the responses to challenging environmental conditions, such as low and high light intensities, which affect the photosynthesis and yielding of plants and crops



From: 01.01.2018.   To: 01.01.2020.




►University of Angers

►Campus du Végétal

►Institut de Recherche en Horticulture et Semences (IRHS)



No. Participant Institution