tailieunhanh - Selection for test weight and kernel weight in high yielding wheat using a safety first index

Five breeding lines and 4 cultivars were grown in replicated trials at 1 location in 1999-2000 and 2 locations in 2000-2001 cropping seasons in İzmir in order to determine the usefulness of a safety-first selection index in making selection among high yielding wheat genotypes for test weight and thousand-kernel weight. | Turk J Agric For 33 (2009) 37-45 © TÜBİTAK doi: Selection for Test Weight and Kernel Weight in High Yielding Wheat Using a Safety-First Index Emre İLKER*, Metin ALTINBAŞ, Muzaffer TOSUN Department of Field Crops, Faculty of Agriculture, Ege University, Bornova 35100, İzmir - TURKEY Received: Abstract: Five breeding lines and 4 cultivars were grown in replicated trials at 1 location in 1999-2000 and 2 locations in 2000-2001 cropping seasons in İzmir in order to determine the usefulness of a safety-first selection index in making selection among high yielding wheat genotypes for test weight and thousand-kernel weight. Genotype × environment interactions were significant for these 2 quality 2 traits. The regression coefficient (bi) of genotypes, variance (Si ) of a genotype across environments, and a safety-first index (Ii) were calculated to evaluate the stability of genotypes for test weight and thousand-kernel weights. Wheat genotypes with lower bi values and small variance (Si2) across environments (the most stable ones) tended also to have lower means for these 2 traits. However, those genotypes with the largest value of index (Ii), which is considered desirable, were found to have the highest mean values for both test – weight and thousand-kernel weight. The rank-correlation coefficient between (Ii) and (Yi) values was significant for thousand-kernel 2 weight. The ranking from Ii was significantly correlated with the rankings from the stability parameters bi and Si for test weight. 2 The rank-correlation coefficients between bi and Si for the 2 physical quality traits were highly significant and of similar magnitude (r = ). It was concluded that a safety-first selection index can be useful in plant breeding for the improvement of wheat cultivars with enhanced stability and consistency of quality characteristics when genotype × environment interaction is present. Key Words: Bread wheat, yield, safety-first index, physical .

• Nông nghiệp
• Bread wheat
• High yielding wheat
• Safety first index
• Physical quality traits
• Rank correlation
• Heterosis analysis in F1 hybrids
• F1 hybrids of bread wheat
• Bread wheat (Triticum aestivum L em Thell )
• Bread wheat over environments
• Bread wheat (Triticum aestivum L )
• Germplasm lines of bread wheat
• Yield and quality traits
• Assessing genetic diversity
• Genetic advance
• Genetic advance analysis in bread wheat
• Bread wheat genotypes
• Cultivars grown in randomized block design
• Diversity analysis of genetic
• Genetic diversity
• Quality characteristics of bread wheat
• Allelic variations
• Seed storage protein
• High molecular weight
• International Winter Wheat Improvement Project
• Wheat (Triticum aestivum L)
• Days to heading
• Thousand grain yield
• Bread wheat (Triticum aestivum L ) genotypes
• Yield attributing traits in bread wheat
• Yield attributing traits
• Character associations for yield
• Bread machine
• Bread quality
• Flour quality
• French bread
• Wheat gluten quantity
• Yield performances
• Principal component axes
• Additive main effects
• Multiplicative interactions
• Bread wheat cultivars
• Boron deficiency
• Bread and durum wheat
• Yield attributes
• B efficient cultivars
• Genotype × environment interaction
• Nonparametric stability measures
• Bread wheat Triticum aestivum L
• Multi environment trials
• Floral traits
• Pollen viability
• Hybrid development in bread wheat
• Male sterile and fertile lines
• Genetic analysis
• Quality traits in bread wheat
• Quality traits
• General combining ability
• Path coefficient analysis
• Direct effect and indirect effects
• Indirect effects
• Bread wheat germplasm
• General and specific combining ability
• Bread wheat (Triticum aestivum L em Thell)
• Specific combining ability analysis
• Late sown condition
• Late sown
• Inbreeding depression analysis for yield
• Associated characters
• Genetic variability
• Quantitative traits
• Rust resistance
• Genetic advance in bread wheat
• Heritability and genetic advance
• Heterosis for grain yield
• Yield components
• Bread wheat (Triticum aestivum L
• Standard heterosis
• Studies on variability
• Qualitative traits
• Combining ability
• Gene effects
• High temperature stress
• Heterosis studies in bread wheat
• High temperature stress environment
• Conducted in randomized block design
• Genetic divergence
• Genetic divergence analysis of agronomic traits
• Contribution of different traits towards diversity
• Randomized block design
• BMC Genomics
• Simple sequence repeat
• Bread wheat speciation
• Genome rearrangement
• Genomic DNA sequence variations
• Mahalanobis D2 statistics
• Triticum aestivum L
• Genetic diversity in bread wheat