chromosome number of sorghum

Thus, the designation of relative arm sizes at metaphase should connote relative molecular size as well. 2001; Howell et al. 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. 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. If maize underwent an allotetraploid event after the divergence of maize from sorghum, why do these plants have an identical number of chromosomes? Chromosome Number of Different Crop Material Agronomy Horticulture Plant Pathology Entemology Plant Breeding Genetics Current Affairs Here, we used FISH-based karyotyping in concert with analysis of chromosome lengths, arm lengths, and arm ratios to establish a size-based nomenclature for sorghum chromosomes. Summary statistics for the Sorghum bicolor reference genome. 1994; Xu et al. The red rectangle represents the sugarcane BACs. Adoption of a common nomenclature for sorghum linkage groups will facilitate the integration of data and genomic resources developed by independent research laboratories. The diploid genome (~730 Mb) has a haploid chromosome number of 10. 1. chromosome number found in . Sorghum nitidum is also a perennial diploid with 2n = 10, 20 and is found in Queensland, New Guinea, and … The 5A genes were used to search for syntenic relationships between grass genomes. 2005b). We developed an integrated “cyto-genomic” map from FISH data on 24 BACs containing linkage markers from across the sorghum genome (Figure 2, Table 2). and . Distal regions of euchromatin and pericentromeric regions of … S. halepense has a chromosome number of either 2n=20 or 2n= 40. 1992; Chittenden et al. Among 335 accessions available to breeders from a previously genotyped sorghum association panel (SAP), we found that 75 were resistant to anthracnose. In addition to its distinctive length (5.11 μm), SBI-01 is one of only two submetacentric pairs and is the only “satellite” chromosome. 1991). Each translocation stock was crossed and backcrossed once to a low-dhur­ rin line of sudangrass. a.src=document.location.protocol+"//script.crazyegg.com/pages/scripts/0042/1390.js? FISH-identified chromatid arms were measured and averaged to determine the length for each arm of the genome. We discovered a 45 kb sorghum BAC (22B2) that differentially hybridizes to centromere regions of 10 of the 20 chromosomes of sorghum (Sorghum bicolor. Sorghum leiocladumwas reported to have 2n= 20 chromosomes but a new number of 2n= 10 was counted. Copyright © 2021 by the Genetics Society of America. 2. in which chromosome number is built by units of ten (i.e. 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). 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. 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. Asterisks denote signals from the 17 BACs shown in Figure 1. All authors read and …

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