engleski

Chlorophyll fluorescence parameters and grain yield of winter wheat genotypes

Photosynthesis often reduces in plants growing under abiotic and biotic stresses, and due to that winter wheat productivity can be limited. The objective of this study was to assess photosynthetic efficiency and find possible correlations with grain yield of different winter wheat genotypes. Chlorophyll a fluorescence of flag leaves was measured by Plant Efficiency Analyser (PEA, Hansatech, UK) during 2011/2012 growing season in order to bring out some biophysical parameters of PSII functioning calculated by JIP test. It was detected that investigated genotypes have significantly different photosynthetic efficiency but significant correlations between grain yield and photosynthetic parameters were not found. In conclusion, the final grain yield of winter wheat does not depend on photosynthesis in optimal conditions, but on another physiological process which may be related with energy usage efficiency or assimilate mobilization. Further efforts to improve grain yield need to be focused on extending the duration of efficient photosynthesis and improving the conversation to grain.

winter wheat; chlorophyll fluorescence; grain yield

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