engleski

Field Study of the Effects of Two Different Environmental Conditions on Wheat Productivity and Chlorophyll Fluorescence Induction (OJIP) Parameters

Wheat is one of the main cereal crops for ensuring food supply. Thus, increasing grain yield is a ma jor target for plant breeders, where insights into wheat productivity can be gained by studying the activity of the components of photosynthetic appar atus. The objectives of this study were to evaluat e the agronomical performance of three winter whea t varieties and test photosyn‐ thetic efficiency over two different locations. Ch lorophyll fluorescence was used to evaluate the ma ximum quantum yield of photosystem II (PSII) (TR0/ ABS) and performance index on absorption basis (PI abs) of flag leaves and glumes of heads at the flo wering stage until the mid‐ senescence stage. The grain yield of all varieties on average was significantly higher at Osijek com pared to Tovarnik. Variety Tika Taka exhibited the highest yield reduction (27.1%) at Tovarnik compa red to Osijek, followed by El Nino (20.5%) and Vul kan (18.7%), respectively. A higher amount of prec ip‐ itation in June at Tovarnik provoked higher Fusari um head blight disease intensity, which could be s een as the bleaching of plant heads at the plots a nd resulted in an earlier decrease in photosyn‐ thetic activity. Therefore, earlier senescence and contracted grain fill duration could occur.

abiotic stress ; chlorophyll fluorescence ; grain yield ; wheat

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