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| Map Set Name: |
Peach-JF-F2 |
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| Abbreviated Name: |
Peach-JF-F2 |
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| Accession ID: |
81 |
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| Species: |
Prunus persica (Peach) |
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| Map Type: |
Genetic |
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| Map Units: |
cM |
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| Published On: |
01 December, 2004 |
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Description:
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A genetic linkage map of peach [Prunus persica (L.) Batch] was constructed in order to identify
molecular markers linked to economically important agronomic traits that would be particularly useful for long-lived perennial species. An intraspecific F2 population was generated from self-pollinating a single F1 plant from a cross between a flat non-acid peach, 'Ferjalou Jalousia' and an acid round nectarin 'Fantasia'. Mendelian segregations were observed for 270 markers including four agronomic characters (peach/nectarine, flat/round fruit, acid/non-acid fruit, and pollen sterility) and 1 isoenzyme, 50 RFLP, 92
RAPD, 8 inter-microsatellite amplification (IMA), and 115 amplified fragment length polymorphism (AFLP) markers. Two hundred and forty-nine markers were mapped to 11 linkage groups covering 712 centiMorgans (cM). The average density between pairs of markers is 4.5 cM. For the four agronomic characters studied, molecular markers were identified. This map will be used for the detection of QTL controlling fruit quality in peach and, particularly, the acid and sugar content. |
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| Map Set Name: |
Peach PMP2 2005 |
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| Abbreviated Name: |
PMP2 |
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| Accession ID: |
26 |
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| Species: |
Prunus persica (Peach) |
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| Map Type: |
Genetic |
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| Map Units: |
cM |
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| Published On: |
01 January, 2005 |
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Description:
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An F2 population from a single F1 plant from the cross of peach [Prunus persica (L.) Batsch] rootstock cultivars Harrow Blood (HB) x Okinawa (Oki) was used to locate the Mi locus, which conditions resistance to Meloidogyne incognita (race 1) (Kofoid and White) Chitwood. These data and comparison of common markers among published genetic linkage maps placed the Mi locus on Prunus L. linkage group 2. Two restriction fragment length polymorphisms (RFLPs) [linked at 4.8 and 6.8 centimorgan (cM), repulsion phase] and one random amplified polymorphic DNA (RAPD) marker (linked at 9.5 cM, coupling phase) were linked to Mi. The RAPD marker was cloned, sequenced, and converted to a polymerase chain reaction (PCR)-based cleaved amplified polymorphic sequence (CAPs) marker. Clones of resistance gene analogs (RGA) developed from Oki were highly polymorphic when used as RFLP probes. The RGA's mapped to four linkage groups but clustered on two of the four linkage groups, providing limited coverage of the genome. Even so, they may be useful as markers for disease resistance genes that occur in other populations. The linkage maps of the HB x Oki F2 population and a peach x almond (Prunus amygdalus Batsch) F2 population were colinear in certain regions, however, a significant number of markers mapped to different linkage groups among the two populations. The locus for the blood-flesh trait (red-violet mesocarp) mapped to the top of linkage group 4. |
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Reference:
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Gillen and Bliss 2005 J. Amer. Soc. Hort. Sci. 130(1):24-33 (ASHS) |
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| Map Set Name: |
Peach-AJ-F2-2005 |
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| Abbreviated Name: |
Peach-AJ-F2-2005 |
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| Accession ID: |
35 |
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| Species: |
Prunus persica (Peach) |
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| Map Type: |
Genetic |
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| Map Units: |
cM |
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| Published On: |
01 January, 2005 |
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Description:
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An integrated genetic linkage map, based on an intraspecific peach F2 population, was constructed to include 94 simple sequence repeat (SSR) loci, 14 sequence tagged sites (STSs), 34 AFLPs, 24 RAPDs, 3 ISSRs, and 9 phenotypic traits. This map contains 178 markers placed in 8 linkage groups that correspond to the basic chromosome number of the species (n=8) with a map distance of 571 cM with an average distance of 3.2 cM between each pair of loci. Our peach genetic linkage map was completely aligned with the European Prunus reference map by using 42 common DNA markers as anchor loci and linkages; the order of all loci were conserved between the 2 maps. It also appears that this peach map covers almost the whole genome in comparison with the Prunus reference map. Nine phenotypic traits were identified in 4 linkage groups. Two kinds of root-knot nematode resistance loci Mia and Mja located on the top of linkage group were very close. Two loci corresponding to flower color (Fc) and flesh color around the stone (Cs), were mapped on the linkage group 3. Flesh adhesion (F), one of the more important characteristics of stone fruits, was mapped at the bottom of linkage group 4. The positions these phenotypic traits were compared with those from other Prunus maps and their relationships were examined in the paper. |
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| Map Set Name: |
Peach-HBOki-F2 |
[ Show Only This Set ] |
| Abbreviated Name: |
Peach-HBOki-F2 |
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| Accession ID: |
65 |
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| Species: |
Prunus persica (Peach) |
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| Map Type: |
Genetic |
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| Map Units: |
cM |
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| Published On: |
01 January, 2005 |
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Description:
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Identification and mapping of markers linked to the Mi gene for root-knot nematode resistance in peach.
An F2 population from a single F1 plant from the cross of peach [Prunus persica (L.) Batsch] rootstock cultivars Harrow Blood ('HB') x Okinawa ('Oki') was used to locate the Mi locus, which conditions resistance to Meloidogyne incognita (race 1) (Kofoid and White) Chitwood. These data and comparison of common markers among published genetic linkage maps placed the Mi locus on Prunus linkage group 2. Two restriction fragment length polymorphisms ('RFLPs') [linked at 4.8 and 6.8 centimorgan ('cM'), repulsion phase] and one random amplified polymorphic DNA ('RAPD') marker (linked at 9.5 cM, coupling phase) were linked to Mi. The RAPD marker was cloned, sequenced and converted to a polymerase chain reaction ('PCR')-based cleaved amplified polymorphic sequence ('CAPs') marker. Clones of resistance gene analogs ('RGA') developed from Oki were highly polymorphic when used as RFLP probes. The RGA's mapped to four linkage groups but clustered on two of the four linkage groups, providing limited coverage of the genome. Even so, they may be useful as markers for disease resistance genes that occur in other populations. The linkage maps of the HB x Oki F2 population and a peach x almond (Prunus amygdalus Batsch) F2 population were colinear in certain regions, however a significant number of markers mapped to different linkage groups among the two populations. The locus for the blood-flesh trait (red-violet mesocarp) mapped to the top of linkage group 4. |
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| Map Set Name: |
Peach-PF-BC1 |
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| Abbreviated Name: |
Peach-PF-BC1 |
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| Accession ID: |
61 |
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| Species: |
Prunus persica (Peach) |
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| Map Type: |
Genetic |
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| Map Units: |
cM |
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| Published On: |
01 October, 2005 |
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Description:
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A set of 146 single sequence repeats (SSRs) and 14 amplified fragment length polymorphism (AFLP) primer combinations were used to enrich a previously developed linkage map obtained from a (Prunus persicaxP. ferganensis)xP. persica BC(1) progeny. Forty-one SSR primer pairs gave polymorphic patterns detecting 42 loci. The restriction/selective primer AFLP combinations produced a total of 79 segregating fragments. The resulting map is composed of 216 loci covering 665 cM with an average distance of 3.1 cM. Novel regions were covered by the newly mapped loci for a total of 159 cM. Eight linkage groups were assembled instead of the earlier 10 as two small groups (G1a and G8b), previously independent, were joined to their respective major groups (G1b and G8a). Several gaps were also reduced resulting in an improved saturation of the map. Twelve gaps >or=10 cm are still present. A comparative analysis against the Prunus reference map (71 anchor loci) pointed out an almost complete synteny and colinearity. Six loci were not syntenic and only two were not colinear. Genetic distances were significantly longer in our map than in the reference one.
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| Map Set Name: |
Peach-GN-F2 |
[ Show Only This Set ] |
| Abbreviated Name: |
Peach-GN-F2 |
[ Download Map Set Data ] |
| Accession ID: |
38 |
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| Species: |
Prunus persica (Peach) |
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| Map Type: |
Genetic |
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| Map Units: |
cM |
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| Published On: |
01 January, 2007 |
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Description:
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Peach tree short life (PTSL) is a devastating disease syndrome of peach [Prunus persica (L.) Batsch] caused by multiple factors; the molecular biology of its tolerance/susceptibility is unknown. The difficulty of studying PTSL is that tree survival or death is not obvious until 3 to 5 years after planting when the symptoms of PTSL first appear. Tolerance to PTSL was unknown in Prunus until the rootstock Guardian? 'BY520-9' was introduced into commercial orchards in 1994. To study the genetics of the response to PTSL, a controlled F2 cross was made between Guardian? 'BY520-9' selection 3-17-7 (PTSL-tolerant) and Nemaguard (PTSL-susceptible). An F1 hybrid was then selfed to generate an F2 population expected to segregate for PTSL response. One hundred fifty-one AFLPs and 21 SSRs, including anchor loci from the Prunus reference genetic map, were used to construct a molecular genetic map based on 100 F2 seedlings. This map covers a genetic distance of 737 cM with an average marker spacing of 4.7 cM and will be used as a framework to construct a highly saturated molecular genetic map. Of the 140 mapped AFLP markers, 38 were associated with PTSL response, as identified previously by bulked segregant analysis. The distribution of the markers associated with PTSL response on the newly constructed genetic map was compared with the recently published Prunus resistance map. This comparison revealed that some resistance gene analogs and several PTSL-associated AFLP markers were located in the same regions in several Prunus linkage groups: G1, G2, G4, G5, and G6. This peach rootstock map can also be viewed and compared with other Prunus maps in comparative map viewer CMap in the Genome Database for Rosaceae (GDR) at http://www.rosaceae.org |
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| Map Set Name: |
Peach-DG-F1-2009 |
[ Show Only This Set ] |
| Abbreviated Name: |
Peach-DG-F1-2009 |
[ Download Map Set Data ] |
| Accession ID: |
62 |
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| Species: |
Prunus persica (Peach) |
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| Map Type: |
Genetic |
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| Map Units: |
cM |
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| Published On: |
01 December, 2009 |
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Description:
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Background: Prunus fruit development, growth, ripening, and senescence includes major
biochemical and sensory changes in texture, color, and flavor. The genetic dissection of these
complex processes has important applications in crop improvement, to facilitate maximizing and
maintaining stone fruit quality from production and processing through to marketing and
consumption. Here we present an integrated fruit quality gene map of Prunus containing 133 genes
putatively involved in the determination of fruit texture, pigmentation, flavor, and chilling injury
resistance.
Results: A genetic linkage map of 211 markers was constructed for an intraspecific peach (Prunus
persica) progeny population, Pop-DG, derived from a canning peach cultivar 'Dr. Davis' and a fresh
market cultivar 'Georgia Belle'. The Pop-DG map covered 818 cM of the peach genome and
included three morphological markers, 11 ripening candidate genes, 13 cold-responsive genes, 21
novel EST-SSRs from the ChillPeach database, 58 previously reported SSRs, 40 RAFs, 23 SRAPs, 14
IMAs, and 28 accessory markers from candidate gene amplification. The Pop-DG map was co-linear
with the Prunus reference T x E map, with 39 SSR markers in common to align the maps. A further
158 markers were bin-mapped to the reference map: 59 ripening candidate genes, 50 coldresponsive
genes, and 50 novel EST-SSRs from ChillPeach, with deduced locations in Pop-DG via
comparative mapping. Several candidate genes and EST-SSRs co-located with previously reported
major trait loci and quantitative trait loci for chilling injury symptoms in Pop-DG.
Conclusion: The candidate gene approach combined with bin-mapping and availability of a
community-recognized reference genetic map provides an efficient means of locating genes of
interest in a target genome. We highlight the co-localization of fruit quality candidate genes with
previously reported fruit quality QTLs. The fruit quality gene map developed here is a valuable tool
for dissecting the genetic architecture of fruit quality traits in Prunus crops. |
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| Map Set Name: |
Peach Pamirskij 5 x Rubira F2 |
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| Abbreviated Name: |
Peach-PR-F2 |
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| Accession ID: |
60 |
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| Species: |
Prunus persica (Peach) |
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| Map Type: |
Genetic |
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| Map Units: |
cM |
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| Published On: |
11 May, 2011 |
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Description:
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The green peach aphid (GPA), Myzus persicae (Sulzer), is a widespread pest insect that significantly reduces yield in peach orchards [Prunus persica (L.) Batsch]. Chemical control of the GPA population in the orchards showed little efficiency because of the development of resistance to most classes of insecticides. Biological control partially gave convincing results. Breeding for resistant peach cultivars is therefore a serious option to take
into account for the development of sustainable pest management. Among the few available resistance cultivars, the rootstock peach "Rubira" shows a strong induced antixenosis-type GPA resistance. This was demonstrated segregating as a single dominant gene. In order to
investigate the genetic basis of resistance and develop molecular tools useful in breeding programs, a F2 population derived from "Rubira" also segregating for leaf color was grown and scored for GPA resistance under contrasted
environmental conditions. An SSR-based genetic linkage
map composed of 120 SSR loci spanned over a distance of 497.8 cM was then established. The GPA resistance mapped to a single locus at the bottom end of linkage group 1. We propose to name Rm2 the dominant allele of the underlying gene. Additionally, a reciprocal translocation was identified near the Gr gene controlling leaf color. The red-leaf parent "Rubira" was demonstrated responsible for the translocation. This study provides the basis for future molecular analysis for the use of Rm2 in peach breeding programs against GPA in peach orchards. |
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| Map Set Name: |
Peach-LN-F2 |
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| Abbreviated Name: |
Peach-LN-F2 |
[ Download Map Set Data ] |
| Accession ID: |
40 |
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| Species: |
Prunus persica (Peach) |
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| Map Type: |
Genetic |
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| Map Units: |
cM |
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| Published On: |
01 April, 1998 |
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Description:
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A genetic linkage map for peach (Prunus persica (L.) Batsch) rootstocks has been constructed using amplified fragment length polymorphism (AFLP) markers in 55 F2 individuals derived from the cross Lovell x Nemared. From 21 different primer combinations, a total of 169 AFLP markers were scored, of which, 153 were assigned to 15 linkage groups covering 1297 centimorgans (cM) of the peach nuclear genome. The average interval between these markers was 9.1 cM. Two genes (Mi and Mij) involved in resistance to root-knot nematodes (Meloidogyne incognita (Kofoid and White) Chitwood and Meloidogyne javanica (Treub) Chitwood) were mapped to a single linkage group (Group I). These two loci were separated by a 16.5-cM interval. One codominant AFLP marker (EAA/MCAT10) was tightly linked to the Mij locus (3.4 cM), and a dominant AFLP marker (EAT/MCAT2) was found to be closely associated with the Mi locus (6.0 cM). These markers are being studied for utilization in peach rootstock breeding with marker-assisted selection. |
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| Map Set Name: |
Peach-NJPKV77119-F2 |
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| Abbreviated Name: |
Peach-NJPKV77119-F2 |
[ Download Map Set Data ] |
| Accession ID: |
42 |
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| Species: |
Prunus persica (Peach) |
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| Map Type: |
Genetic |
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| Map Units: |
cM |
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| Published On: |
01 April, 1998 |
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Description:
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We have developed a highly saturated linkage map in peach using 3 separate crosses: one segregating for morphological characters, one segregating for fruit quality traits, and one that contains important rootstock characters. Linkage maps were created for each cross using RFLP, RAPD, and AFLP markers. In the fruit quality cross, with the analysis of 2 years of field data, we have identified 12 QTL that influence soluble solids, pH, cold tolerance, maturity, and fruit size. In the rootstock cross, we have identified tightly linked markers to 2 loci controlling resistance to Meloidogyne spp. root-knot nematodes. In both maps, identified markers are being converted to sequence tagged sites (STS) for use in marker assisted selection. Anchor loci present in 2 or 3 of the maps were used to join the equivalent linkage groups from each map resulting in a combined linkage map for peach. We are also constructing physical maps for several genomic regions controlling traits of interest, to convert genetic map distances to physical distances. Probes specific to individual "combined" linkage groups, are being used to determine their respective chromosomal assignments by in situ hybridization as well. |
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| Map Set Name: |
Peach-ScB-F2-1998 |
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| Abbreviated Name: |
Peach-ScB-F2-1998 |
[ Download Map Set Data ] |
| Accession ID: |
3 |
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| Species: |
Prunus persica (Peach) |
[ View Species Info ] |
| Map Type: |
Genetic |
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| Map Units: |
cM |
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| Published On: |
01 April, 1998 |
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Description:
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We have developed a highly saturated linkage map in peach using 3 separate crosses (Sc x B, NJ Pillar x KV 77119, and Lovell x Nemared) : one segregating for morphological characters, one segregating for fruit quality traits, and one that contains important rootstock characters. Linkage maps were created for each cross using RFLP, RAPD, and AFLP markers. In the fruit quality cross, with the analysis of 2 years of field data, we have identified 12 QTL that influence soluble solids, pH, cold tolerance, maturity, and fruit size. In the rootstock cross, we have identified tightly linked markers to 2 loci controlling resistance to Meloidogyne spp. root-knot nematodes. In both maps, identified markers are being converted to sequence tagged sites (STS) for use in marker assisted selection. Anchor loci present in 2 or 3 of the maps were used to join the equivalent linkage groups from each map resulting in a combined linkage map for peach. We are also constructing physical maps for several genomic regions controlling traits of interest, to convert genetic map distances to physical distances. Probes specific to individual "combined" linkage groups, are being used to determine their respective chromosomal assignments by in situ hybridization as well. |
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