engleski

Water deficiency effects on photosynthetic performance in leaves of sunflower plants at developmental stage of butonisation

Sunflower (Helianthus annuus L.) is one of the oil crops that plays an important role in agriculture production and processing industries over the past 30 years. One of the limiting factors of sunflower growth is drought that causes stress and affects the photosynthetic activity which results in reduced plant growth and plant development. The influence of water stress on the performance index (PIABS) and maximum quantum yield of photosystem II (Fv/Fm) was studied on 13 sunflower genotypes. In the first treatment plants were maintained at 80% of the field water capacity while, in the second treatment, the field water capacity was 60%. Performance index in the first treatment ranged from 4.069 to 6.074 while values for the second treatment ranged from 3.345 to 5.817. In the first treatment genotypes 1, 3, 5, 7 and 8 showed a lower activity of the maximum quantum yield of photosystem II while in the second treatment values were higher. Genotypes 1, 8, 9 and 11 were singled out according to the values of PIABS and Fv/Fm, which may indicate higher stability of these genotypes in stressful growing conditions. These analyses can be used in the selection of sunflower genotypes with better tolerance to stress conditions.

Sunflower; performance index; maximum quantum yield of photosystem II; water stress

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