• “Effect of thermal stress on the macroorganization of antenna system and the regulation of dissipative ways in the chloroplasts of higher plants” - joint project between Institute of Plant Biology, Hungarian Academy of Sciences and Institute of Plant Physiology - Sofia; 1996 – 1999.

• “Low temperature induced photoinhibition in bean plants: recovery and acclimation” - joint project between the University of Dundee, UK and Institute of Plant Physiology - Sofia. LST.CLG 974973 NATO Scientific division; 1999 – 2001; Coordinator of the project.

• “Reddening of cotton leaves: causes and biochemical mechanisms” - joint project with Ege University, Izmir, Turkeu; 2001 – 2003.

• “Light stress tolerance in plants acclimated to different low-temperature regimes: Role of polyamines” - Royal Society joint project between the University of Dundee, UK and Institute of Plant Physiology – Sofia, Bulgaria; 2002 – 2004 Coordinator of the project.

• “Role of LHCII in the light harvesting and photoprotection”- joint project between Institute of Plant Biology, Hungarian Academy of Sciences and Institute of Plant Physiology – Sofia, Bulgaria; 2004 – 2007.

• “Physiological role of endogenous isoprene under different environmental stresses” - joint project between Istituto di Biologia Agroambientale e Forestale (IBAF) at CNR, Rome, Italy and Institute of Plant Physiology – Sofia, Bulgaria. LST.CLG.978838 NATO; 2002 – 2004.

• “Present and future antioxidant action of plant isoprenoids” - joint project between Istituto di Biologia Agroambientale e Forestale (IBAF) at CNR, Rome, Italy and Institute of Plant Physiology – Sofia, Bulgaria; 2004 – 2007.

• LST.CLG 982412 NATO - Plants from ultramafic sites as tools for remediation - joint project between the University of Dundee, UK and Institute of Plant Physiology – Sofia, Bulgaria. Coordinator of the project.

• “Role of supramolecular organization of PSII - LHCII complex in isoprene emitting plants and its relation to thermoprotection” - joint project between Institute of Plant Biology, Hungarian Academy of Sciences and Institute of Plant Physiology and Genetics – Sofia, 2010-2012. Coordinator of the project.

• “Physiological role of biogenic isoprene against UV-B radiation stress” - joint project between Istituto di Biologia Agroambientale e Forestale (IBAF) at CNR, Rome, Italy and Institute of Plant Physiology and Genetics – Sofia, Bulgaria, 2010-2012.

• “Manipulation of light quality to optimize photosynthesis and production of secondary metabolites of interest for plant protection” - joint project between Institute for Plant Protection at CNR, Florence, Italy and Institute of Plant Physiology and Genetics – Sofia, Bulgaria, 2013-2015.