Genetic diversity, distribution and domestication history of the neglected GGAtAt genepool of wheat

Wheat yields are stagnating around the world and new sources of genes for resistance or tolerances to abiotic traits are required. In this context, the tetraploid wheat wild relatives are among the key candidates for wheat improvement. Despite its potential huge value for wheat breeding, the tetraploid GGAtAt genepool is largely neglected. Understanding the population structure, native distribution range, intraspecific variation of the entire tetraploid GGAtAt genepool and its domestication history would further its use for wheat improvement. The paper provides the first comprehensive survey of genomic and cytogenetic diversity sampling the full breadth and depth of the tetraploid GGAtAt genepool. According to the results obtained, the extant GGAtAt genepool consists of three distinct lineages. We provide detailed insights into the cytogenetic composition of GGAtAt wheats, revealed group- and population-specific markers and show that chromosomal rearrangements play an important role in intraspecific diversity of T. araraticum. The origin and domestication history of the GGAtAt lineages is discussed in the context of state-of-the-art archaeobotanical finds. We shed new light on the complex evolutionary history of the GGAtAt wheat genepool and provide the basis for an increased use of the GGAtAt wheat genepool for wheat improvement. The findings have implications for our understanding of the origins of agriculture in southwest Asia

Relationships among the A Genomes of Triticum L. Species as Evidenced by SSR Markers, in Iran

The relationships among 55 wheat accessions (47 accessions collected from Iran and eight accessions provided by the Institute of Plant Biology of the University of Zurich, Switzerland) belonging to eight species carrying A genome (Triticum monococcum L., T. boeoticum Boiss., T. urartu Tumanian ex Gandilyan, T. durum Desf., T. turgidum L., T. dicoccum Schrank ex Schübler, T. dicoccoides (Körn. ex Asch. & Graebner) Schweinf. and T. aestivum L.) were evaluated using 31 A genome specific microsatellite markers. A high level of polymorphism was observed among the accessions studied (PIC = 0.77). The highest gene diversity was revealed among T. durum genotypes, while the lowest genetic variation was found in T. dicoccoides accessions. The analysis of molecular variance (AMOVA) showed a significant genetic variance (75.56%) among these accessions, representing a high intra-specific genetic diversity within Triticum taxa in Iran. However, such a variance was not observed among their ploidy levels. Based on the genetic similarity analysis, the accessions collected from Iran were divided into two main groups: diploids and polyploids. The genetic similarity among the diploid and polyploid species was 0.85 and 0.89 respectively. There were no significant differences in A genome diversity from different geographic regions. Based on the genetic diversity analyses, we consider there is value in a greater sampling of each species in Iran to discover useful genes for breeding purposes

В Туве издано первое учебное пособие по буддизму

Аннотация: Абаев Н. В., Хомушку О. М., Бичелдей У. П. Буддизм в Центральной Азии: история, основы учения и культура. Кызыл, 2013

ТИПОВЫЕ ОБРАЗЦЫ РОДА TRITICUM L. В ГЕРБАРНОЙ КОЛЛЕКЦИИ ВИР (WIR): ЧАСТЬ 1

В статье представлены данные о хранящихся в Гербарии культурных растений, их диких родичей и сорных растений Всероссийского научно-исследовательского института растениеводства им. Н.И. Вавилова (WIR) номенклатурных типах 25 таксонов – как дикорастущих, так и культурных – рода Triticum L. в ранге вида, подвида и разновидности, описанных К.А. Фляксбергером, М.М. Якубцинером, М.Г. Туманяном, А.Е. Коварским, П.А. Гандиляном, П.М. Жуковским, Н.А. Дроздовым, А.А. Филатенко и У.К. Куркиевым. Выбраны 14 лектотипов

Emmer (Triticum dicoccon Schrank) in Oman

The original publication is available at www.springerlink.co

A note about Triticum in Oman

The original publication is available at www.springerlink.co