Response of flax (Linum usitatissimum L., Griesb.) genotypes to environment: Assessment of genetic variability in fibre yield and its component traits
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Date
2019-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Field experiment on 18 fibre flax (Linum usitatissimum L., Griesb.) genotypes were carried out during the rabi season on two consecutive years viz., 2016-17 and 2017-18 at N.E Borlaug Crop Research Centre (CRC) in G.B.P. U.A.T, Pantnagar (29o N, 79o29”E at an altitude of 243.83m). An investigation into assessment of genetic variability, inter character association and path coefficient analysis were performed on individual year separately along with the response of their genotype × environment interaction effect on physiological production capacity of fibre yield and expression of component traits were examined through pooled analysis across two environments. The seeds of 18 fiber flax genotypes were obtained from CRIJAF Barrakpore, and were planted during 16 October and 13 November for the year 2016-17 and 2017-18 respectively in Randomized Block Design (RBD) with three replications. In order to encourage slender, linear un-branched plants, dense planting of the seeds were adopted in 25cm apart rows. The plot size was maintained 3 4 m2. Standard agronomic practices were carried out periodically throughout the crop growth till final harvest at maturity. Ten randomly selected flax plants were considered for recording of observation on 13 quantitative characters of fiber flax, which included technical height, green stem weight, wet mass of straw, air dry straw yield, fiber weight (observations were taken at both flowering and maturity), days to 50% flowering, no of leaves, and 3 qualitative characters of fiber flax, which included elongation, force and tenacity. The results revealed significant differences for all the traits among genotypes both in individual years. On pooled analysis fiber weight at flowering and fiber weight at maturity exhibited significant variations for genotype × environment interaction effect and environments. The genotypic differences on pooled analysis appear for technical height, green straw weight (both at flowering and maturity), force and tenacity. The preponderance of additive genetic control in expression of characters was registered for fiber weight at flowering and maturity. Correlations coefficient and path coefficient analysis suggested that technical height at flowering and maturity, green straw weight at maturity, wet mass of straw at flowering and fiber weight at flowering were the important component traits for the improvements of fiber weight at maturity. Nine genotypes were identified as promising for different traits. These included JRF-17 (technical height at flowering, fiber weight at flowering), JRLU-1 (fiber weight at flowering, wet mass straw at flowering and maturity), JRFS-1 (wet mass straw at flowering and maturity), JRF-16, JRF-18 (fiber weight at flowering), JRF-7,JRF-9,JRF-10 (technical height at flowering), JRFJ-1 (wet mass straw at flowering). Effective utilization of these nine genotypes lead to introduce wider adaptation across environment and would encourage in developing superior high yielding flax genotype as one of the parents in hybridization programme.
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