Assessment of genetic diversity and variability for yield and its component in bread wheat (Triticum aestivum L. em.Thell)
| dc.contributor.advisor | Karnwal, M.K. | |
| dc.contributor.author | Annu Kumari | |
| dc.date.accessioned | 2022-03-07T07:23:29Z | |
| dc.date.available | 2022-03-07T07:23:29Z | |
| dc.date.issued | 2021-10 | |
| dc.description.abstract | Wheat (Triticum aestivum L. em. Thell), also known as Bread Wheat is an allohexaploid crop (2n=6x=42), belongs to family Gramineae. It is known as ‘King of Cereals’ as it is the best staple diet for the people and can be grown in variety of soils and climates. The present investigation was conducted at N. E. Borlaug Crop Research Centre, G. B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, during the Rabi Season 2020-21. The experiment was carried out in the Complete Randomized Block Design (CRBD) containing 25 genotypes along with three replications. The observation were recorded for thirteen characters viz., days to 75% heading, days to maturity, plant height, spike length, awn length, productive tillers per plant, spikelets per spike, grains per spike, grain weight per spike, 1000- grain weight, biological yield per plant, grain yield per plant and harvest index. The recorded data were analysed for analysis for variance, variability, heritability, genetic advance, correlation and clustering of different genotypes. Results revealed that variance was highest for plant height and lowest for grain weight per spike. The coefficient of variability was recorded highest for grain weight per spike and lowest for days to 75% heading. The PCV was greater than GCV for all the characters studied. High value of heritability was recorded for plant height and lowest for biological yield per plant. Grain yield per plant exhibited highest genetic advance in percent of mean and lowest for days to maturity. However, correlation analysis revealed that grain yield exhibited highly significant and positive phenotypic and genotypic correlation with 1000 grain weight followed by harvest index, biological yield per plant and grains per spike. Path coefficient revealed that Harvest index, biological yield per plant, days to maturity, productive tiller per plant, spikelets per spike, plant height, 1000 grain weight and awn length exhibited positive direct effect towards grain yield. However, grain weight per spike, spike length, grains per spike and days to 75% heading showed negative direct effect towards grain yield. All 25 genotypes of bread wheat was grouped into eight clusters with different genotypes based on Mahalanobis D2 statistics. Out of eight clusters, cluster I had 5 genotypes, cluster II had 7 genotypes, cluster III consisted of 3 genotypes, cluster IV consisted of 3 genotypes, cluster V consisted of 2 genotypes, cluster VI included 1 genotype, cluster VII included 2 genotypes and cluster VIII consisted of 2 genotypes. The maximum intra cluster distance was found for cluster VIII (75.935) and cluster VI (0.00) had minimum intra cluster distance. Inter cluster distance was found maximum between cluster I and cluster VIII (619.920) and minimum was found in cluster II and cluster VIII (313.372). The higher inter cluster distance indicated greater genetic diversity between the genotypes of those clusters, while lower values between the clusters suggested that the genotypes of these clusters had lesser genetic diversity. Maximum per cent contribution towards the total genetic divergence was indicated for plant height (25.54) and minimum for days to maturity (0.38). | en_US |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810183095 | |
| dc.keywords | genetic diversity, variability, yield components, wheat | en_US |
| dc.language.iso | English | en_US |
| dc.pages | 109 | en_US |
| dc.publisher | G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand) | en_US |
| dc.research.problem | Wheat | en_US |
| dc.sub | Genetics and Plant Breeding | en_US |
| dc.theme | Genetic Parameters | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | Assessment of genetic diversity and variability for yield and its component in bread wheat (Triticum aestivum L. em.Thell) | en_US |
| dc.type | Thesis | en_US |