Fotoperiodická reakce odrůd pohanky (Fagopyrum esculentum Moench.)
Authors: J. Petr, D. Hradecká
Page: 129-134
English / Anglicky:
Two-year photoperiodic experiment was conducted to study the response to day length of an original Czech variety Pyra and a collection of 15 European buckwheat (Fagopyrum esculentum Moench.) varieties. The experiment was based on succesive transition of plants from long, natural day, into a short one, 8-hour lasting day (after four or five days, respectively). None of studied varieties was manifested as a typical short-day plant when a short day could condition transition into generative period. Short day fastened the formation of generative organs, but only after several long days, usually after 10 to 15 days. These variants included higher plants, more branches and more buds, inflorescences and flowers per plant. Such behaviour allows classifying most of varieties into the group of long-short-day plants, as defined by Dostál (1949). Owing to the changes in the day length during ontogenesis heterophylly, size and shape of leaves (arrow-shaped leaves) changed, particularly in the varieties Prego and Tardo, occurred. Owing to a short day the colour of stem also changed from green to crimson in the varieties Balada, Skorospelaja and Pyra. The photoperiodism changed during vegetation affected also heterostyly, the ratio of long-style and short-style flowers. The number of long-style flowers rather prevailed in long day, while the number of short-style flowers prevailed in the short day. Varieties explicitly sensitive to short day were not found in the studied collection. The varieties, in which short day fastens bud and flower formation, and long day inhibits this process, can be considered as ones with certain sensitivity to short day. In this case this group can comprise the varieties Bolševik, Kora, Lilejla and Tardo. Varieties of neutral day length include the majority of the studied varieties: Pyra,