The profusion, diversity and value of genetic resources significantly contribute to the success of flax breeding. Of special value are genotypes of local origin, highly adapted to the local climatic and soil conditions. Storage of genetic resources in Lithuania was started in 1994-1995. During the period 1995-1997 25 flax varieties and local accessions were studied at the Upytė Research Station of LIA. In 1998-2000 we tested 21 varieties and breeding lines, in 2001-2002 18 accessions, in 2003-2004 12 accessions. The best genotypes were included in flax breeding programs. About 50 genotypes have been transferred to the Gene Bank of the Lithuanian Institute of Agriculture after assessment for biological-agronomical characters following UPOV descriptors.
The objective of flax breeding at the Upyte Research Station of LIA is to develop new varieties with a high yielding capacity, satisfactory resistance to lodging and diseases, as well of adequate quality to meet the demands of the textile industry. Two high yielding varieties with a good fibre quality ‘Vega 2’ and № 1547-11-7 have been developed at the Upyte Research Station of LIA recently. In the present paper we have provided a description of the origin of those 2 varieties, main yielding characteristics and fibre quality parameters. The variety ‘Vega 2’ produced 20 % higher stem yield, 18.3 % higher seed and 47 % higher long fibre yield than the standard variety ‘Orshanskij 2’. Long fibre quality of the variety ‘Vega 2’ is good: fibre is firm, flexible, fine and meets the demands of the textile industry. Stem yield of the variety № 1547-11-7 was similar to that of ‘Orshanskij 2’ and ‘Belinka’. Seed yield was 0.13 t/ha higher than that of the variety ‘Orshanskij 2’ and equal to the seed yield of ‘Belinka’. Long fibre quality of № 1547-11-7 is good and also meets the demands of the textile industry. The variety ‘Vega 2’ has been registered in Lithuania since 1997, in Latvia since 2001. The seed samples of the variety № 1547-11-7 have been transferred to the Genebank.
Fifteen different flax cultivars and breeding lines (E-68, -3, 1864-24) were cultivated, harvested, water-retted, scutched and resulting fibres passed through pin frames to produce representative samples for each variety. The aim of this investigation was to develop rapid techniques for assessing quality of fibre obtained from a comparative agronomical trial. The fibres produced were then assessed using visible and near infrared spectroscopy (Vis-NIRS), thermal analysis, scanning electron microscopy and airflow method for measuring fibre fineness. The relationships between agronomical characteristics, fibre fineness, thermal and spectral results were assessed using principal component analysis and partial least squares regression methods. The micrographs of the samples revealed the presence of residual pectic and cuticular tissues on all fibres, and significant differences between the 15 fibre samples were not observed. A significant relationship of the differences in fibre fineness of the test samples as measured by airflow method and Vis-NIR spectra was observed with an R 2 of 0.97 and standard error of calibration (SEC) of 1.69 dtex, and the former parameter also correlated with the measured thermal combustion parameters showing an R 2 of 0.91 and SEC of 2.86 dtex, indicating that the two rapid techniques could be used for the assessment of fibre quality of selected plants from the breeding programme. The advantages of using the two instrumental techniques compared with the existing airflow method are briefly discussed.
Different methods to control flax diseases are admissible in the modern plant protection. It is advised to treat seeds and growing plants by fungicides to kill the pathogens of fungal diseases. Fertilisation by microelements and using of right means of agrotechnology (optimal sowing time, resistant varieties etc.) are preventing plants from physiological injures. However, one of the most effective means against diseases is development and growing of resistant varieties.Fibre flax breeding has been carried out in Lithuania since 1922 in Dotnuva Plant Breeding Station. Since 1965 this work is being done in Upyte Research Station.In this paper we analyse a fibre flax collection in Upyte Research Station and show that some varieties are resistant to most widespread flax fungal diseases.
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