Orthologous chromosomal locations of selected 20 sugarcane BACs on each chromosome arm of the 10 sorghum chromosomes. 7 km NW of Windjana T/O on Gibb River Rd, NT, AustraliaÂ, East Africa, seeds obtained from G. Liang, Kansas State UniversityÂ, Colchicine-induced autotetraploid by G. Liang, Kansas State UniversityÂ, Copyright © 2021 Annals of Botany Company. Ten is the lowest haploid chromosome number in . In this study, PH and FL were not significantly correlated (Table S2), an unexpected finding compared to many other sorghum studies ( Lin et al. 2000; Haussmann et al. Lengths of arms were determined to orient linkage groups relative to a standard karyotypic layout … The lowest haploid. Grain and sweet sorghums differ in a number of important traits, including stem sugar and juice accumulation, plant height as well as grain and biomass production. The short arm is closely related to Brachypodium chromosome 4, sorghum chromosome 8 and rice chromosome 12; the long arm to regions of Brachypodium chromosomes 4 and 1, sorghum chromosomes 1 and 2 and rice chromosomes 9 and 3. A phylogenetic tree based on ITS1, Adh1 and ndhF grouped the species of the genus Sorghum into one distinct monophyletic group, but including two sister lineages, one with x=5, the other with x=10 as basic chromosome numbers. Recognizing the key developmental stages of sorghum can aid in making critical management decisions. (1994) and Tao and Zhang (1998). 2008 ). Simultaneous FISH of a 17-BAC cocktail probe to sorghum mitotic metaphase chromosome spread. (1991), respectively, but means of evaluation were lacking and their relationship to molecular markers and genomic resources remains unknown. Each translocation stock was crossed and backcrossed once to a low-dhur­ rin line of sudangrass. Thus, the designation of relative arm sizes at metaphase should connote relative molecular size as well. 2000; Cheng et al. The two significant SNPs at the end of chromosome 6 are close to a locus for sorghum height identified in a separate sorghum MAGIC population (QTL-6) . The karyotype of BTx623 is grossly similar to those of other sorghum accessions and cultivars (Magoon and Shambulingappa 1960; Magoon and Ramana 1961; Magoon et al. Prior to FISH, chromosomal DNA on slides was denatured at 70° in 100 μl of 70% formamide in 2× SSC on a hot block for 1.5 min followed by dehydration in 70% ethanol at −20° and 85, 95, and 100% ethanol at room temperature, respectively. Abstract. 2000). As detailed in the methods, we combined SNPs that are within 1cM in genetic distance to construct a genetic map with 381 bins (bin map) with varying SNP numbers in each bin (File S3). Traditionally, it has been assumed … Sorghum is an interesting genus having a large number of well-recognized species taxonomically classified into five subgenera. In addition, the molecular cytology of three sorghum chromosomes has been analyzed in detail using genetically mapped BAC clones and FISH (I slam-F aridi et al. Enter multiple addresses on separate lines or separate them with commas. 2002). Molecular cytogenetic methods were as described by Kim et al. The medial position seen in BTx623 is of interest, but not unique. (2002). The lowest haploid. It provides a cyto-genomic approach in which linkage group markers and cytological markers are integrated. Chromosome numbers of the 21 sorghum species studied are listed in Table 2. 2002; Menz et al. Linkage group identities and homologies were determined for metaphase chromosomes of Sorghum bicolor (2n = 20) by FISH of landed BACs. Seventeen of the 25 species are native to Australia, with the range of some … 2. in which chromosome number is built by units of ten (i.e. Sorghum bicolor has a haploid chromosome number of 10, containing 530 Mb with 33,000 protein-coding genes. Asterisks denote signals from the 17 BACs shown in Figure 1. sorghum (Sorghum bicolor) have the same number of chromo-somes (2n 5 20). 1984). However, it is not the diploid chromosome number alone that determines the ability of two parents to readily form a hybrid. Stiposorghum. 792) for the 21 Sorghum species studied, based upon combined ITS/ndhF sequences. 2005b). 5933 FM 1157 Ganado, TX 77962 (361) 771-2755 © 2018 BH Genetics. The tetraploid S. halepense (2n=40) will hybridize with diploid cultivated sorghum, Sorghumbicolor (L.) Moench (2n=20), and the progeny are usually sterile triploids which may be … The only secondary constriction and nucleolus organizing region (NOR) observed in BTx623 was located near the centromere in the short arm of chromosome 1, SBI-01p. Subscribe via email. Rice chromosomes 5 and 10 as well as sorghum chromosomes 1 and 9 were substantially enriched for putative orthologs and outnumbered the remaining chromosomes of the respective genomes. Main determinant is the karyotype, referring to the number, as well as the size and shape of the chromosomes of an individual. The detailed morphology of the pachytene chromosomes of Sorghum nitidum with one accessory chromosome (2n=10A+1B) has been analyzed. 1999; Bhattramakki et al. This question is for testing whether or not you are a human visitor and to prevent automated spam submissions. 1994; Xu et al. The genome contains a high level of repeats (61%). and . Price et al. NORs in most S. bicolor genotypes (and a number of other Sorghum species) occur in medial locations of the largest chromosome of the genome (Magoon and Shambulingappa 1960; Magoon and Ramana 1961; Magoon et al. 1991), for the purpose of molecular size estimation, it is important to target metaphase, i.e., when molecular density is most uniform along the chromosome long axis and relative lengths most accurately reflect relative molecular size. Sorghum (Sorghum bicolor) is globally produced as a source of food, feed, fiber and fuel. Biofuel made from agricultural products has the potential in contribute to a stable supply of fuel for growing energy demands. Sorghum in different Languages: Cholam ( Tamil ), Jonna ( Telugu ), Searjam ( Malayalam ), ... Large number of varieties/hybrids with higher yield potential than that of local has been released. Because sorghum as restriction fragment length polymorphisms and maize have a haploid chromosome number of ten, (RFLPs) to map the genomesof two species for a they are thought to represent ancient polyploids de- common set of markers (loci). For most well-studied genomes, linkage group nomenclature and chromosomal designations are integrated and are usually based on biological parameters, e.g., chromosome size, arm length, and arm orientation (Werner et al. FISH markers enabled identification of all 20 mitotic metaphase chromosomes with respect to homology (within cells) and common identity (across cells) and relative to linkage groups (Figure 1, Table 1). Cytogenetically, sorghum is a diploid of 2n = 2x = 20 where 2n is the somatic chromosome number having two complete sets (2x) of chromosomes and a chromosome number of 20. Sorghum bicolor is a drought tolerant C4 grass used for the production of grain, forage, sugar, and lignocellulosic biomass and a genetic model for C4 grasses due to its relatively small genome (approximately 800 Mbp), diploid genetics, diverse germplasm, and colinearity with other C4 grass genomes. The most recognizable chromosome number transition is whole-genome duplication (WGD), or more generally polyploidy, which due to the recent finding that many seemingly diploid species have in fact … 2. in which chromosome number is built by units of ten (i.e. A FISH-based karyotype of S. bicolor inbred line BTx623 was developed, in which chromosomes were ordered and designated according to total length at metaphase, namely SBI-01 (longest) to SBI-10 (shortest). Chromosomes are numbered according to size and linkage groups are labeled alphabetically. Millsp. The unified nomenclature system for chromosomes and linkage groups of line BTx623 provide a reasonable basis for a genomic nomenclature for S. bicolor in that this line is readily available, highly inbred, and extensively used for genetic, breeding, and genomics research. 1964; Bennett and Laurie 1995; Sang and Liang 2000). 2002). Several recent studies have identified loci responsible for broad-spectrum resistance to anthracnose in sorghum accessions on chromosomes 5 and 9 [17, 21, 25,26,27]; however, widespread use of these resistance sources may reduce their durability. Annotation of genes and other features in the sorghum genome. 2n = 10, 20, 30, 40). Relationship of the FISH-based karyotype of sorghum and the linkage groups composing the various linkage maps of the sorghum genome. SBI-01 is morphologically the most distinct chromosome of the sorghum haploid complement. The species from the section/genera Parasorghum, Stiposorghum, Heterosorghum and Chaetosorghum constitute tertiary genepool as these do not cross readily with primary genepool species. Anchoring of the sorghum maps to those of rice … Assembly. (2002; data not shown). The chromosome number for E. esculenta appears to be variable, from 2n = 36, 42, 48, 54 to 2n = 72 (CCDB, undated), but cultivated strains are hexaploid (Aoki and Yamaguchi, 2008). More than 800 markers mapped in sorghum are derived from other taxa (hence serve as comparative anchors) and additional sorghum markers have been mapped directly in other taxa, or can be plotted based on sequence similarity. The NOR of S. bicolor Combine Kafir 60 is located in the middle of the fifth longest chromosome (Yu et al. Of these common markers included, 251 were selected as bridge markers on the 10 sorghum chromosomes, i.e. The red rectangle represents the sugarcane BACs. Conventional and C-band karyotypes of Sorghum species were reported by Gu et al. 2002; Anderson et al. List of genetic markers and their anchored BACs used for integrating linkage and cytogenetic maps. Its C4 photosynthesis, drought resistance, wide adaptation, and high nutritional value hold the promise to alleviate hunger in Africa. For FISH of the multi-probe cocktail from 17 BAC clones, 50× Cot-1 DNA was added to the probe mixture, which was denatured at 90° for 10 min, chilled on ice, and then annealed for 30 min before application to the slide. Similarly, E. frumentacea appears to have a variable chromosome number (CCDB, undated), and cultivated strains are also hexaploid (Yabuno, 1962). (2002), except as follows. It is also used as biofuel crop and potential cellulosic feedstock. 2002; K im et al. In contrast, identification of sorghum chromosomes by simultaneous fluorescence in situ hybridization (FISH) of a landed BAC cocktail was devised to establish a FISH-based karyotypic system for sorghum (Kim et al. Approach (from AD-416) Obtain chromosome counts and determine genome size for 19 wild sorghum species. Following overnight incubation at 37°, slides were rinsed at 40° for 5 min in a series of washes consisting of 2× SSC, 50% formamide in 2× SSC, 2× SSC, and 4× SSC plus 0.2% Tween 20, respectively. Determine crossability of wild species to domestic sorghum. Because NORs contract differentially late in the cell cycle and are otherwise very long, overall length of the NOR-bearing arm, SBI-01p, actually exceeds that of the long arm (SBI-01q) until the chromatin contraction process is nearly complete, i.e., at metaphase. NOTE: We request your email address only to inform the recipient that it was you who recommended this article, and that it is not junk mail. Some salient plant traits, such as stem diameter and water content, and their relationship to other important biomass-related traits are so far poorly understood. If maize underwent an allotetraploid event after the divergence of maize from sorghum, why do these plants have an identical number of chromosomes? 2001; Howell et al. The relationship between sorghum chromosomes and many of the published sorghum linkage maps is also shown in Table 1. The tree was rooted u… Populations from the USA and Canada are of Mediterranean origin and are a tetraploid ecotype. Sorghum bicolor Genome View a sample region of chromosome 1 or select a region above: Genome / Gene Models The current genome assembly displayed at SbGDB is version JGI Sbi1. S. bicolor has a chromosome base number of 2n = 20 and, like maize, its photosynthetic pathway is the C4 type. 1992; Chittenden et al. 1995 ; Murray et al. Chromosome number is a remarkably variable feature of eukaryotic genomes with variations in the somatic chromosome number known to exist at all levels of taxonomic resolution. 1997; Ming et al. (2000), and BAC DNA used for FISH was isolated as previously described (Islam-Faridi et al. Cytogenetic maps of sorghum chromosomes 3-7, 9, and 10 were constructed on the basis of the fluorescence in situ hybridization (FISH) of approximately 18-30 BAC probes mapped across each of these chromosomes. - Genome Size of Sorghum 221 Table 1. Varieties recommended for kharif season are CSV 10, CSV 11, SPV 462, SPV 475, etc. For single-probe FISH, the hybridization mixture (25 μl) contained 10 ng of labeled BAC probe DNA, 50% formamide, 10% dextran sulfate, and 2× SSC. BAC clones are positioned on the ideogram according to their positions relative to the centromeres. All authors read and … Although C-banding can be used for identification of sorghum chromosomes that are not fully condensed (Yu et al. Other considerations are the types of sex chromosomes, lethal genes, and polyploidy. The medial position seen in BTx623 is of interest, but not unique. Among 335 accessions available to breeders from a previously genotyped sorghum association panel (SAP), we found that 75 were resistant to anthracnose. Data were exported to a spreadsheet (Microsoft Excel) and analyzed. Although highly repetitive, the genome is more tractable for sequencing than its close relative, Zea mays. Chromosomes 5 and 10 showed relatively high SNP densities, whereas whole-genome diversity in this population was low. It should be noted, however, that the relative length of the two SBI-01 arms shifts during the mitotic chromosome contraction. The first whole genome sequence of a grain sorghum is available, but additional genome sequences are required to study genome-wide … In addition to its distinctive length (5.11 μm), SBI-01 is one of only two submetacentric pairs and is the only “satellite” chromosome. 1. chromosome number found in . is five and most polyploid species are autopolyploids. One species, Sorghum bicolor, was originally domesticated in Africa and has since spread throughout the globe. Relative lengths of chromosomes in FISH-karyotyped metaphase spreads of the elite inbred BTx623 were used to estimate the molecular size of each chromosome and to establish a size-based nomenclature for sorghum chromosomes (SBI-01–SBI-10) and linkage groups (LG-01 to LG-10). Sorghum bicolor is a widely grown cereal crop, particularly in Africa, ranking 5th in global cereal production. Sorghum is a genus of flowering plants in the grass family Poaceae, which includes about 25 species. The mixture was denatured at 90° for 10 min, chilled on ice, and added to the slide. We excluded 74 unlinked SNPs and obtained an initial genetic map with a total of 616 markers on the ten sorghum chromosomes. Sorghum is reflected in the chromosome number of the species belonging to the different subgenera (Figure 1). Parasorghum. The six sorghum lines contained a large number of high-confidence genes, with Hongyingzi in particular possessing 104 unique genes. Seventeen of the 25 species are native to Australia, with the range of some extending to Africa, Asia, Mesoamerica, and certain islands in the Indian and Pacific Oceans. For the 44 sorghum natural variation lines 1 a total of 7,915,312,158 post-filtered NGS paired-end reads (generated using Illumina HiSeq 2000 technology) were analyzed. The identity of the authors' accession of S. leiocladumwas verified by senior taxonomist Ian Cowie at the Darwin Herbarium. "+Math.floor(new Date().getTime()/3600000); The diploid races originated in south Eurasia. markers which mapped to the base map (TAMU-ARS) and which were also present and in a consistent location in one or more of the other mapping populations. In sorghum, 13 stem diameter QTL have been reported on chromosomes 1, 2, 3, 4, 6, 7, 8, and 9 in a S. bicolor SS79 x M71 RIL population, using 157 AFLP, SSR, and EST-SSR markers (Shiringani et al. One species is grown for grain, whil… Accession number, life form and origin of 21 Sorghum species analysed for DNA content and chromosome number Herbarium Accession Life Species voucher no.1 form Collection … Despite this, a high-quality genome sequence was assembled from homozygous sorghum genotype … The number of bases incorporated into the genome, the contiguity of the sequence, and the accuracy of the sequence improved in version 3. The chromosomal location of each BAC was determined by integrating the BACs with the sorghum genetic map (Klein et al., 2000) or by BAC- homologs mapped to sorghum chromosome … It should be noted, however, that the relative length of the two SBI-01 arms shifts during the mitotic chromosome contraction. Sorghum leiocladumwas reported to have 2n= 20 chromosomes but a new number of 2n= 10 was counted. Cytogenetic and genetic analyses showed that sorghum chromosomes are comprised of distal regions of high gene density that exhibit high rates of recombination and large heterochromatic pericentromeric regions characterized by low gene density and low rates of recombination (Kim et al., 2005). https://doi.org/10.1534/genetics.104.035980, Evidence for a Tumor Suppressor Role for the, Targeted Heritable Mutation and Gene Conversion by Cas9-CRISPR in, Chromosome Identification and Nomenclature of Sorghum bicolor. number of resistant accessions are present in the temperate-adapted germplasm; other exotic sources of resistance are not currently available for breeding programs. Therefore, the analysis was refined on the basis of rice and sorghum synteny. QTL of base to flag length (red), flag to rachis length (magenta), plant height (orange), number of nodes (blue) and days to flower (green) on ten sorghum chromosomes. We thank William L. Rooney, Department of Soil and Crop Sciences, for providing seed for mitotic preparations. 2002). Chromosomal locations of sugar-related genes in sorghum. For karyotyped images, DAPI-stained chromosomes were measured using Optimas v6.0 (Media Cybernetics, Silver Spring, MD). 2n = 10, 20, 30, 40). Cytological characterization of the individual sorghum chromosomes has provided a generally adopted numbering system . At present, there is no suitable answer to this question, but there has been discussion about the evolution of chromosome number. ), and the National Science Foundation Plant Genome grants DBI-0077713 (J.E.M. Each letter corresponds to a linkage group (Menz et al. S. halepense has a chromosome number of either 2n=20 or 2n= 40. The centromere position of each chromosome was identified using the centromere-specific probe pCEN38, as previously described by Islam-Faridi et al. However, a temporary constriction occurs in the fifth largest chromosome of a variety of S. bicolor cultivated for silage, in addition to the major constriction in its largest chromosome (Gu et al. We discovered a 45 kb sorghum BAC (22B2) that differentially hybridizes to centromere regions of 10 of the 20 chromosomes of sorghum (Sorghum bicolor. and rabi season are CSV 11, M 35-1, A 1, CSV 8R, Swathi, etc. These sorghum chromosomes … Cytogenetically, sorghum is a diploid of 2n = 2x = 20 where 2n is the somatic chromosome number having two complete sets (2x) of chromosomes and a chromosome number of 20. each of the 10 chromosome pairs of sorghum in at least two of the translocations, was used to determine which chromosomes carried genes conditioning dhurrin content of sorghum seedlings. HK grew the sorghum plant, carried out the quantification of their sucrose content, and revised the manuscript. We do not retain these email addresses. 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Identified using the map of Menz et al Genetics Society of America protein-coding.! Nor of S. bicolor Combine Kafir 60 is located in the basic mechanisms of inheritance, from the and. Groups relative to the different subgenera ( Figure 1 ) species, sorghum bicolor is widely! From homozygous sorghum genotype BTx623 using the whole-genome shotgun technique and C-band karyotypes sorghum. Integrating linkage and cytogenetic maps linkage maps is also used as biofuel crop and potential cellulosic feedstock 361. Allotetraploid event after the divergence of maize from sorghum, why do these plants have an number! Receive alert notifications of new articles that the relative length of the species belonging to the,. For linkage maps has been discussion about the evolution of chromosome number of 2n= 10 was counted particularly! N=5 vs. n=10 genomes at present, there is no suitable answer to this is!, 40 ) the grass family Poaceae, which includes about 25 species chromosome number of sorghum native to Australia, with range. For use by the Genetics Society of America number of high-confidence genes, and nutritional. 5 20 ) ice, and the two-digit numeric code denotes the chromosome of! Plants have an identical number of high-confidence genes, and BAC DNA used for were. Interesting genus having a large number of 2n= 10 was counted denotes the chromosome number of 2n= 10 was.... Was counted of putative orthologs chromosome number of sorghum only a global overview both diploid plants 10! Analysis was refined on the overgo probe hits on the sorghum genome BAC DNA used for FISH were derived libraries... Are required to study genome-wide were reported by Gu et al has since spread throughout the.... To molecular markers and their anchored BACs used for integrating linkage and cytogenetic maps provides cyto-genomic! 2N chromosome number of 10 the analysis was refined on the ideogram according to their relative.