The photoperiodic response of buckwheat varieties (Fagopyrum esculentum)
2002
Petr, J. | Hradecka, D. (Ceska Zemedelska Univ., Prague-Suchdol (Czech Republic). Agronomicka Fakulta)
Two-year photoperiodic experiment was conducted to study the response to day length of an original Czech variety Pyra and collection of 15 European buckwheat (Fagopyrum esculentum) varieties. The experiment was based on succesive transition of plants from long, natural day, into a short one, 8-hour lasting day. 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. Owing to the changes in the day length during ontogenesis heterophylly, size and shape of 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 into the short day. Varieties explicitly sensitive to short day were not found in the studied collection. The varieties, in vhich short day fastens bud and flower formation, and long day inhibits this process, can be considered as ones with certain sensitivity to short day.
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