DYNAMICS OF PHOTOSYNTHESIS INTENSITY IN BUCKWHEAT VARIETIES WITH INDETERMINATE VS. DETERMINATE GROWTH HABITS
2022
Amelin, A.V. | Fesenko, A.N. | Zaikin, V.V. | Fesenko, I.N. | Chekalin, E.I.
Buckwheat breeding in Russia is applied several morphological mutations. Agricultural practice has given preference mainly to determinant varieties, which are based on a single-gene mutation d (det), which restricts the generative development of shoots to 3-5 inflorescences. Since the beginning of the 21st century, the share of determinant varieties in the buckwheat sowing area in Russia has increased from 8.2% up to 56.2%, which contributed to an increase in the average crop yield by 1.5 times. A steady increase in the productivity of determinant varieties in comparison with traditional (indeterminate) varieties implies significant changes in their physiology, including the regulation of processes associated with photosynthesis, as well as additional optimization of source-sink relationships. Comparison of buckwheat varieties with determinant and indeterminate types does not reveal differences in the photosynthesis intensity in the period before flowering. However, during the period of seed filling, the differences between these groups of varieties, as a rule, are significant, and reach a maximum 3 weeks after the start of flowering, that is, during the most intensive seed formation. These results show that determinant varieties, on average, form a stronger "demand for assimilates" during the period of mass seeds filling compared to indeterminate varieties.
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