tailieunhanh - Evidence for the origin of the B genome of bread wheat based on chloroplast DNA

The hexaploid bread wheat Triticum aestivum L. (AABBDD) is thought to have originated through one or more rare hybridization events between Aegilops tauschii (DD) and the tetraploid Emmer wheat T. turgidum subsp. dicoccon (AABB). | N. HAIDER Research Article Turk J Agric For 36 (2012) 13-25 © TÜBİTAK doi: Evidence for the origin of the B genome of bread wheat based on chloroplast DNA Nadia HAIDER* Department of Molecular Biology and Biotechnology, Atomic Energy Commission of Syria (AECS), . Box 6091, Damascus - SYRIA Received: Abstract: The hexaploid bread wheat Triticum aestivum L. (AABBDD) is thought to have originated through one or more rare hybridization events between Aegilops tauschii (DD) and the tetraploid Emmer wheat T. turgidum subsp. dicoccon (AABB). The progenitor of the A genome of T. aestivum has generally been accepted to be T. urartu. The origin of the B genome, however, is controversial and still relatively unknown. Research has found the B genome in T. turgidum to be closely similar to the S genome in section Sitopsis of Aegilops L.; the Sitopsis diploid species were thus proposed as the probable maternal parent in the original cross that resulted in the tetraploid T. turgidum. Moreover, the donor of the cytoplasm of T. turgidum and T. aestivum was also the donor of most, if not all, of the B genome chromosomes. The present study attempts to investigate the polymorphism of chloroplast DNA between T. aestivum and 8 different Aegilops species using cleaved amplified polymorphic sequence (CAPS) and sequencing on 28 chloroplast loci in order to identify the chloroplast donor (B genome donor) of bread wheat. A phylogenetic tree based on the data generated demonstrates that Ae. speltoides was distinct from the other Aegilops species analyzed and the most closely related to bread wheat. It can be concluded that Ae. speltoides may be the chloroplast donor to bread wheat and the donor of its B genome. Understanding hexaploid wheat origin would further its genetic improvement and is also important for the artificial development of synthetic forms. Key words: Aegilops, CAPS, chloroplast DNA, identification, sequencing Introduction Wheat .

• Nông nghiệp
• Bread wheat Triticum aestivum L
• Chloroplast DNA
• Identifi cation
• Cleaved amplifi ed polymorphic sequence
• Aegilops tauschii
• Bread wheat (Triticum aestivum L )
• Germplasm lines of bread wheat
• Yield and quality traits
• Assessing genetic diversity
• Bread wheat
• Heterosis analysis in F1 hybrids
• F1 hybrids of bread wheat
• Bread wheat (Triticum aestivum L em Thell )
• Bread wheat over environments
• 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
• Wheat (Triticum aestivum L
• Genetic divesity
• Promising bread wheat
• Grain yield per plot
• Genotype × environment interaction
• Nonparametric stability measures
• Multi environment trials
• Genetic variability
• Quantitative traits
• Rust resistance
• Heterosis for grain yield
• Yield components
• Bread wheat (Triticum aestivum L
• Standard heterosis
• Studies on variability
• Heritability and genetic advance
• Qualitative traits
• Combining ability
• Gene effects
• Marker assisted selection
• Leaf rust
• Resistance genes
• Triticum aestivum
• Genetic divergence
• Mahalanobis D2 statistics
• Triticum aestivum L
• Genetic diversity in bread wheat
• Mean squares
• Lines and testers
• Component traits in bread wheat
• 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
• Better parent heterosis
• Economic heterosis
• Heat tolerant traits
• Bread wheat [Triticum aestivum (L
• )]
• Heat tolerant trait
• Sowing date
• Fertilizer level
• Nutrient uptake
• Irrigated condition
• Yield and yield related traits
• Protein content
• Bread wheat (Triticum aestivum L Em Thell)
• Late sown environments
• Variability for protein content
• Combining ability studies
• Morpho physiological
• Attributes nitrogen
• Efficiency and its related traits
• Canopy temperature depression
• Chlorophyll fluorescence
• Heat tolerance and yield
• Abiotic stress
• Wheat Triticum aestivum L
• Disease resistance
• Yellow rust
• Polymerase chain reaction
• Biparental mating
• SCA and triticum aestivum
• Deciphering the genetics
• Important grain yield traits
• Genetic advance in bread wheat
• Genetic divergence analysis of agronomic traits
• Contribution of different traits towards diversity
• Randomized block design
• Yield potential
• Principal components
• Identify potential varieties of bread wheat