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VC221: Tomato
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sequencing
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1st criteria: Chromosome with NOR vs without with: chromosome 2 2nd criteria: Position of the centromere a) Median chromosomes 5, 11, 12 (metacentric) b) Sub median all others (sub-metacentric) 3rd criteria: Short arm heterochromatic regions a) A conspicuous cluster of chromomeres compressed together: chromosomes. 3, 4, 6. b) More than 1 cluster of chromomeres: chromosomes. 1, 7, 10. Key for pachytene chromosome identification
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Primary trisomicPachytene and diakinesis/metaphase I: 12II+ 1I, 11II +1III Secondary trisomic Pachytene: Isochromosome paired with itself, triradial III Diakinesis/Met I: 11II +ring of III, 12II + 1I (mini ring). Tertiary trisomicDiakinesis/Met I: 10II + 1V Telo trisomicDiakinesis/Met I: heteromorphic III, or tiny univalent Primary MonosomicDiakinesis/Met I: 11II + 1I Tertiary MonosomicDiakinesis/Met I: 10II + 1III, 10II + 3I
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LA 1182 sy - sf(3) alb - mua (12) LA1441 coa - c(6) a - hl (11) LA1443 scf - dgt(1) l -al(8) LA1444 wd - d(2) af - tf(5) LA1445 clau-di(4) icn - ag(10) LA1446 var - not(7) ah - marm(9) Tomato Mapping Stocks
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Distribution of tomato species Zuriaga et al 2008
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L. cheesmanii minor typicum
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S. lycopersicon typ: S. cheesmaniae min: S. galapagence S. pimpinellifolium S. neorickii S. chemieleskii S. habrochaites S. pennellii S. peruvianum S. arcanum S. Corneliomuellerii S. huayalasense S. chilense Eulycopersicon (color-fruited) Eriopersicon Green-fruited S. lycopersicoides, S. ochrantum, S. sitiens (based on 6 DNA seq, Adh 2, fw2.2)
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Zuriaga et al 2008
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Dimeric Monomeric
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Esc-pennelli introgression lines Each stock is homozygous for a single chromosome segment (delineated by RFLP markers) introgressed from L. pennellii, such that the entire wild species genome is represented in a group of 50 lines.
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Dissection of QTL se2.1(stigma exertion Four loci influencing stamen length (three closely linked) were identified. A single locus for style length was identified (the long style allele was shown to be dominant using esc-penn sustitution lines). A single locus for anther dehiscence was also found in the region. Chen and Tanksley 2004
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Fine mapping loci contributing to the se2.1 QTL
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Five closely linked genes all contribute to stigma exsertion phenotype. This may be the remnant of a “co adapted gene complex” where linked genes cooperatively contribute to an adaptation, and are inherited as a single unit.
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Tomato Genome Sequencing Project
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Successful crossUnsuccessful cross S e S e (female) x S 1 S 2 (male) S 1 S 2 (female) x S e S e (male) S e S e (female) x S P S P (male) S P S P (female) x S e S e (male) S P S P (female) x S 1 S 2 (male) S 1 S 2 (female) x S P S P (male) Tomato SI
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