Photoperiodic dependence of gynecium in different soybean genotypes

The carried out researches have shown dependence of inclination angle of pistil style in soybean flower from developing lengths of day in period of flower formation, ovary growth and beans formation. The increase in photoperiod duration causes re-duction of angle α°SPS inclination of pistil style. Flowers and beans formation in the conditions of the truncated photoperiods of the rather genetically determined optimum for each separately taken soybean genotype defines angle α°SPS increase. The revealed dependence between degree of adaptability of soybean genotype to photoperiod and inclination angle of pistil style allows to rec-ommend it as a visual express method of a tentative estimation of soybean plant potential reaction for day length and a determina-tion of its inhering to northern or southern ecotype without organization of latitudinal tests and use of computational methods of research.