EFFICIENCY OF PHOTOSYNTHETIC APPARATUS OF SWEET PEPPER Capsicum annuum L. F1 HYBRIDS AND THEIR PARENTAL COMPONENTS IN HIGH TEMPERATURE CONDITIONS
Petkova, V., Maritsa Vegetable Crops Research Institute, Plovdiv (Bulgaria) | Todorova, V., Maritsa Vegetable Crops Research Institute, Plovdiv (Bulgaria) | Tomlekova, N., Maritsa Vegetable Crops Research Institute, Plovdiv (Bulgaria)
The effect of high temperatures on the condition and functional activity of photosynthetic apparatus PSA in 12 sweet pepper Capsicum annuum L. genotypes – four F1 hybrids and their parental forms, through the chlorophyll fluorescence parameters of photosystem II PS II and plastid pigments content in leaves was evaluated. The study was conducted in 2010 – 2011 under field conditions. Measurements have been performed during the reproductive period of the plants, in the morning hours of the day at 21 – 23 єC used as controls and in the afternoon at high temperature 33 – 35 єC. In the dark-adapted leaves, an increase of the initial Fo fluorescence and a decline of the maximum Fm and variable fluorescence Fo, as well as the potential quantum efficiency of PS II Fv/Fm were observed in all genotypes at high temperature conditions. In conclusion, it was considered that I photosynthetic apparatus of the F1 hybrids possesses higher level of tolerance to moderate high temperature stress compared to that of the parental genotypes; II genotypes with orange fruits are more sensitive to high temperature than those with red-coloured fruits.
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