Water availability is a major limiting factor for wheat (Triticum aestivum L.) production in rain-fed agricultural systems worldwide. Root architecture is important for water and nutrition acquisition for all crops, including wheat. A set of 158 diverse wheat genotypes of Australian (72) and Indian (86) origin were studied for morpho-agronomical traits in field under irrigated and drought stres...

Mammalian tetraploid embryos die in early development because of defects in the epiblast. Experiments with diploid/tetraploid chimeric mice, obtained via the aggregation of embryonic stem cells, clarified that while tetraploid cells are excluded from epiblast derivatives, diploid embryos with tetraploid extraembryonic tissues can develop to term. Today, this method, known as tetraploid compleme...

introduction: embryonic stem (es) cells are pluripotent cells derived from the inner cell mass of blastocysts. these cells are appropriate for creation of animal models of human genetic diseases, the study of gene functions in vivo and differentiation into specific types as potential therapeutic agents for several diseases. we describe here production of transgenic chimeric mouse blastocysts by...

The wild wheat Aegilops tauschii Coss. has extensive natural variation available for breeding of common wheat. Drought stress tolerance is closely related to abscisic acid (ABA) sensitivity. In this study, 17 synthetic hexaploid wheat lines, produced by crossing the tetraploid wheat cultivar Langdon with 17 accessions of Ae. tauschii, were used for comparative analysis of natural variation in d...

Pre-harvest sprouting (PHS) is an important cause of quality loss in many cereal crops and is particularly prevalent and damaging in wheat. Resistance to PHS is therefore a valuable target trait in many breeding programs. The Phs-A1 locus on wheat chromosome arm 4AL has been consistently shown to account for a significant proportion of natural variation to PHS in diverse mapping populations. Ho...

Abstract Background During the bread wheat speciation by polyploidization, a series of genome rearrangement and sequence recombination occurred. Simple repeat (SSR) sequences, predominately located in heterochromatic regions chromosomes, are effective marker for tracing genomic DNA variations. However, to date distribution dynamics SSRs on chromosomes its donors, including diploid tetraploid Tr...

Einkorn (Triticum monococcum L. ssp. monococcum) is an ancient diploid wheat species with many useful traits and used as a gene discovery model. In this research, total of 41 tetraploid accessions were tested using simple sequence repeat (SSR) markers. A 33 genotypes T. along four each (T. dicoccon durum) plant material. The analysis utilized 10 polymorphic markers, including number alleles ave...

Abstract Current knowledge of the origins and routes introduction both tetraploid hexaploid free-threshing wheats (FTWs) from western Asia into Europe remains imprecise. Archaeobotanical distinction ploidy level is often dependent on sparsely recovered rachis segments, while more specific identification cultivars within groups using morphological characteristics either grain or chaff generally ...

Observations of atypical grains and relatively small quantities diagnostic rachis fragments have led to suggestions that a new type wheat was introduced into Late Anglo-Saxon agriculture (c. AD 850–1066). This crop tetraploid free-threshing (FTW), potentially unknown in Britain since the Neolithic. Based on growing requirements, this is considered most likely been rivet, tall cultivar associate...