Vegetation period of genetic resources of flax (Linum usitatissimum L.)
Introduction: Institute of Natural Fibres and Medicinal Plants (INF&MP) is involved in gathering and evaluation of genetic resources of flax (Linum usitatissimum L.), hemp (Cannabis sativa L.) and medicinal plants, because Poland has signed the Convention on Biological Diversity. Field trials were carried out in 1990–2001 in the Experimental Station in Wojciechów located in Opolskie region. The research material was accessions of genetic resources from the collection of flax, stored at the Institute of Plant Breeding and Acclimatization Institute in Radzików near Warsaw. Objective: The aim of the publication was to evaluate the following biological features of flax: time of beginning of flowering and vegetation period to yellow maturity. Methods: The characteristics data for flax accessions are presented according to the methodology of development of the International Flax Database. Each flax accessions from the world collection of flax genetic resources received one of the following assessments of two vegetation periods: very short, short, medium, long and very long. Descriptors of biological features of flax were used, presented in “List of flax descriptors (L. usitatissimum L.)” edited by Janka Nozkova, published in 2011. These descriptors are used to develop the International Flax Database, which in turn helps in the rapid evaluation of the L. usitatissimum genetic resource collection. Carrying out a detailed characterization of biological features of L. usitatissimum accessions is very helpful for breeders in selecting genetic material for breeding new varieties of flax. Results: The following results were obtained from the time of the beginning of flowering and the vegetation period to yellow maturity. Time of beginning of flowering was the following: very short – 0 accessions, short – 97 accessions, medium – 20 accessions, long – 2 accessions and very long – 0 accessions of flax. The genotypes tested were characterized by the following results in terms of vegetation period from sowing to yellow maturity: very short – 0, short – 37, medium – 62, long – 0 and very long – 0 accessions of flax. Conclusions: Time of beginning of flowering and the vegetation period to yellow maturity shall be revalorised to the International Flax Database for those L. usitatissimum accessions that did not receive the same assessment of the biological features tested in the two or three years of the study.