Estimates of Variability and Heritability in Linseed Germplasm (original) (raw)
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2020
In Ethiopia, among the highland oilseeds, Linseed (Linumusitatissimum L.) stands second next to niger seed in total production and areas coverage (CSA, 2017/18). Its area and production are estimated to 79044.51 hectares and 88209.65 tones, respectively, at private peasants’ holdings level, with an average productivity of 1.116 tons/ha (CSA, 2017/18). It is often grown on well-drained and organic matter rich soils or by using inorganic fertilizer. Ethiopian linseed is well adapted to cool, long growing season and high rainfall areas at elevation between 2200 and 2800 meters. In these areas, the temperature and rainfall range from 12 to 18C and 500 to 1200 mm, respectively during the main growing season. It grows well in either a heavy sandy loam or light clay soils with a good drainage system (Getinet and Nigussie, 1997). The crop is traditionally used for many purposes, such as source of food, feed, fiber, oil, medicine, industrial raw material and export commodity. Linseed cake is...
2014
Understanding the genetic diversity of linseed (Linum usitatissimum L.) is important for the continued improvement of this crop as well as for its development in the agricultural system. Therefore, to generate adequate information on genetic diversity of linseed, 49 sample accessions collected from five regions of Ethiopia along with 15 cultivars were used in this study with the objectives of investigating the morphological diversity between and within germplasm. Experiment was conducted at Sinana Agricultural Research Center, South Eastern Ethiopia. Treatments were arranged in 8 x 8 simple lattice square design with two replications. The Agro-morphological data were subjected to the analysis of variance. Highly significant variation for all the characters except for number of seeds per capsule and biomass. Clustering pattern and correlation matrix among and within Ethiopian linseed landraces and non-native cultivars were discussed. Furthermore, there were ample variations between a...
Journal of plant breeding and genetics, 2014
Understanding the genetic diversity of linseed (Linum usitatissimum L.) is important for the continued improvement of this crop as well as for its development in the agricultural system. Therefore, to generate adequate information on genetic diversity of linseed, 49 sample accessions collected from five regions of Ethiopia along with 15 cultivars were used in this study with the objectives of investigating the morphological diversity between and within germplasm. Experiment was conducted at Sinana Agricultural Research Center, South Eastern Ethiopia. Treatments were arranged in 8 x 8 simple lattice square design with two replications. The Agro-morphological data were subjected to the analysis of variance. Highly significant variation for all the characters except for number of seeds per capsule and biomass. Clustering pattern and correlation matrix among and within Ethiopian linseed landraces and non-native cultivars were discussed. Furthermore, there were ample variations between and within Ethiopian linseed landraces and non-native cultivars, implying high chances for current and future genetic improvements in which desirable traits could be incorporated to new cultivars.
Diversity and Characters in Ethiopian Linseed Accessions
Research Article, 2015
Ethiopia is a centre of diversity for linseed, where it is valued for cultural reasons as well as use as food and for export. Limited amounts of the crop are grown widely in Ethiopia, which includes the unique climatic conditions of the tropical highlands (3-15°N, >2000m). A range of some 200 accessions were evaluated for diverse quality, agronomic and morphological traits. They were also genotyped with IRAP (InterRetroelement Amplified Polymorphisms). It is probable that the genetic diversity in this area has not been exploited in breeding programmes. The results show a range of characters which can be exploited, some appropriate for smallholder and commercial farmers in Ethiopia, producing a sustainable, secure, high-value crop meeting agricultural, economic and cultural needs. Analysis of sequence data is likely to allow identification of probes suitable for chromosome identification and potentially tracking chromosomes in breeding programmes.
Morphological and molecular characterization of germplasm is important for the sustainable exploitation of crops. Linseed or flax (Linum usitatissimum) is a multipurpose crop grown in many environments for food, feed, fibre and industry. In Ethiopia, a centre of diversity for linseed, it is valued for food and export. Here, we aimed to develop and use a set of morphological descriptors to determine levels and patterns of diversity in Ethiopian germplasm from the tropical highlands (3–15°N, [ 2,000 m a.s.l.) in 198 Ethiopian traditional varieties. The Ethiopian traditional varieties included plants with both fibre and oilseed stem-branching morphotypes, although most were relatively small-seeded. Traditional variety oil quality was assessed; oil content was as low as 30 % compared to 47 % reported elsewhere. Days-to-flowering and days-to-maturity varied widely and were highly heritable. Ethiopian linseed had dominant and recessive yellow seed genotypes; some had a recessive conjoined or conjoined-seed character. The descriptors developed here will be useful for genetic mapping and selection of breeding lines. The results show the range of characters which can be exploited in breeding lines appropriate for smallholder and commercial farmers in Ethiopia, producing a sustainable, secure, high-value crop meeting agricultural, economic and cultural needs.
Greener Journal of Plant Breeding and Crop Science, 2016
Grain yield, oil content and other related traits of linseed (Linum usitatissimum L.) have been improved in the country over the last 25 years through breeding and other improved production techniques. The objective of this study was to estimate the genetic progress made in improving grain yield, oil content and associated traits. The experiment was conducted at Hossaina, Kokate, Dida-Midore and Holeta in 2009/10. A randomized complete block design with four replications was used. Nine released cultivars from 1984 to 2009, three pipeline varieties, and one local cultivar were used as testing materials. Among many others, the major traits that were analyzed in this study include grain and oil yields, oil content, thousand seeds weight, number of capsules per plant and seeds per capsule. Regression of trait means against the year of release indicated that thousand seeds weight and number of capsules per plant exhibited significant (P ≤ 0.05) changes while the others being nonsignificant since 1984. However, dramatic and highly significant (P ≤ 0.01) progress was observed in major traits such as grain and oil yields, oil content and thousand seeds since 1992 and furthermore since 1997. The estimated rates of increases per year were 4.33, 9.78 and 10.45 kg ha-1 for grain yield, 2.01, 4.59 and 5.00 g ha-1 for oil yield, 0.05, 0.10 and 0.12% for oil content, 0.033, 0.057 and 0.06 g for thousand seeds weight and 0.11, 0.15 and 0.18 capsules per plant since 1984, 1992 and 1997, respectively. These significant and linear genetic gains showed that there is no indication of a yield plateau for linseed breeding in Ethiopia. Therefore, the effort should be strengthened and continued to achieve more progresses in these and other relevant traits.
The experiment was conducted using simple lattice design with two replication and the trails was totally consisted fifty six genotypes. Data on seed yield and other Agronomic traits were used to estimate the genetic variability parameters, heritability and genetic advance (GA). Analysis of variance revealed highly significant and significant difference for all studied traits. Evaluated characters were exhibited different levels of variability, heritability and genetic advance among the studied genotypes. Low to high phenotypic coefficient of variation (PCV) and genotypic coefficient of variation (GCV) were recorded. The highest GCV and PVC values were found particularly for lodging percent (76.65% and 90.63%), harvest index (42.26% and 47.92%) yield per hectare (41.23% and 48.19%) and number of capsule per branch (30.81% and 37.25%) respectively, whereas low GCV and PCV (8.27% and 9.73% respectively) manifested for days to maturate. The highest broad sense heritability value manifested for harvest index (77.78%) followed by seed yield per hectare (73.21%), while lowest heritability (3.78%) revealed only for seed per capsule. In present study low to moderate genetic advance were manifested and high heritability and genetic advance as percentage of mean (>50) was recorded for lodging percentage, number of capsule per branch, seed yield per hectare and harvest index, indicating predominance of additive gene action for these characters. Therefore the result of this study suggests existence of variability for seed yield and other agronomic traits in these linseed genotypes, which should be exploited in future breeding.
In the present study, the estimates of the parameters of variability viz., phenotypic coef-ficient of variation, genotypic coefficients of variation, heritability in broad sense (h 2), expected genetic advance expressed as percentage of mean and mean performance of various quantitative traits of linseed were studied. The analysis of variance revealed highly significant differences among the treatments for all traits. The magnitude of phenotypic coefficient of variation (PCV) was higher than genotypic coefficient of vari-ation for (GCV) all the characters. The high percentage of PCV was observed in grain yield/plant (67.96%) followed by biological yield /plant (54.11%), harvest index (53.90%), capsules/plant (50.42%), secondary branches (37.49%), primary branches (30.16%), grain yield/plot (25.40%) whereas, the GCV percentage was high in grain yield/plant (64.10%) followed by harvest index (52.75%), biological yield/plant (50.94%), capsules/plant (45.47%), secondary branches/plant (3...
Genetic Variability in Bold Seeded genotypes of Linseed (Linum usitatissimum L.)
International Journal of Current Microbiology and Applied Sciences
The recent experiment with the title “Genetic variability in bold seeded linseed (Linum usitatissimum L.) was conducted in “Research cum instructional farm, Department of Genetics and Plant Breeding, College of Agriculture, IGKV, Raipur, C.G.” during rabi season 2021-2022, we used total 40 bold seeded (> 6.5 gm of 1000 seed weight) linseed genotypes including 5 checks (RLC-133, RLC-138, RLC-143, RLC-148 & RLC- 153), we used Randomized complete block design with three replications for sowing the seed in field and observations were recorded for different agro morphological traits, listed on linseed descriptors Kanpur (2010) are “days to commencement of flowering, plant height(cm), days to 50 % flowering, days to maturity, number of primary branches per plant, number of secondary branches per plant, total number of branches per plant, number of capsules per plant, number of seeds per plant, 1000 seed weight (g), oil content (%), harvest index (%), and seed yield per plant (g).” All ...
Agricultural Science Digest - A Research Journal, 2014
Linseed is an important oilseed crop which belongs to the family linaceae. Thirty six genotypes of linseed were evaluated for genetic variability, heritability and genetic advance. High phenotypic and genotypic coefficient of variation values were observed for seed yield, number of capsules per plant, biological yield, number of primary branches per plant and number of secondary branches per plant. High heritability coupled with high genetic advance was observed for number of capsules per plant, seed yield per plant, biological yield, plant height and number of primary branches per plant, indicating that heritability is due to additive gene action and selection based on these characters may be effective.