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  • Key words Apple  (3)
  • Scolytidae  (3)
  • BIOSCIENCES  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Quantitative genetic analysis and comparison of physical and sensory descriptors relating to fruit flesh firmness in apple (Malus pumila Mill.) (2000)
    Springer
    Theoretical and applied genetics 100 (2000), S. 1074-1084 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Key words Apple ; Fruit ; Firmness ; Texture ; QTL analysis ; Genes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  Texture is a major component of consumer preference for eating-quality in apple. A quantitative genetic analysis of traits associated with fruit-flesh firmness was carried out. This was based on segregation in an unselected mapping population replicated at six sites and harvested over 2 years. Different methods of assessment were compared, and a principal components analysis carried out. Instrumental measures used were Magness-Taylor penetrometer readings, stiffness by acoustic resonance, and a range of sensory descriptors assessed by a trained panel. There were good correlations between some measures, although stiffness was poorly correlated. Whilst genotype by environment effects were large, significant effects were attributable to the genotype, and these were used to detect QTLs. Significant QTLs were detected on seven linkage groups, with large effects on linkage groups L01, L10 and L16. Whilst there was a poor correlation between acoustic stiffness and other measures, the significant and suggestive QTL detected for stiffness on linkage group L10 did represent a subset of significant QTLs detected for the penetrometer measure. The use of sensory assessment proved valuable in detecting QTLs representing different attributes of fruit texture. The possibility of interaction between significant QTLs for fruit texture and other strongly selected traits such as scab resistance and fruit acidity is addressed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001220051389
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Determination of chirality of alcohol or latent alcohol semiochemicals in individual insects (1985)
    Springer
    Journal of chemical ecology 11 (1985), S. 1659-1667 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Chiral semiochemicals ; pheromones ; enantiomeric composition ; Ips pini ; Coleoptera ; Scolytidae ; Apis mellifera ; Hymenoptera ; apidae ; Cryptolestes Ferrugineus ; Cucujidae ; acetyl lactate diastereoisomers
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract A method is described for determining the enantiomeric composition of chiral alcohols, lactones, and hydroxy acids in quantities ranging from 25 ng to 10 μg. Derivatization of the substance with chirally pure acetyl lactate, followed by splitless capillary gas chromatography, enables enantiomeric determinations to be made within 1–3% of the actual value. This technique was applied in the determination of semiochemical inIps pini (Say),Apis mellifera (L.), andCryptolestes ferrugineus (Stephens). The results indicate that considerable variability exists within populations of some insects in the composition of their chiral semiochemicals, whereas others produce substances of constant composition.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01012119
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Ipsenol: an aggregation pheromone forIps latidens (Leconte) (Coleoptera: Scolytidae) (1991)
    Springer
    Journal of chemical ecology 17 (1991), S. 1517-1527 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Pheromone ; ipsenol ; cis-verbenol ; chirality ; Ips latidens ; Coleoptera ; Scolytidae ; predator ; kairomone ; Enoclerus sphegeus ; Thanasimus undatulus ; Cleridae
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Ipsenol was identified from the frass of male, but not female,Ips latidens from British Columbia, feeding in phloem tissue of lodgepole pine,Pinus contorta var.latifolia. The responses ofJ. latidens to sources of ips-enol andcis-verbenol were determined with multiple-funnel traps in stands of lodgepole pine in British Columbia. Ipsenol attracted both male and femaleI. latidens, verifying that it is a pheromone for this species. MaleI. latidens showed a slight preference for (S)-(−)-ipsenol.cis-Verbenol was not produced by beetles of either sex and, in contrast to an earlier report, both enantiomers inhibited attraction to ipsenol-baited traps. The predators,Enoclerus sphegeus andThanasimus undatulus (Cleridae), were attracted to traps baited withcis-verbenol and ipsenol.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00984685
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Introgression of the Vf source of scab resistance and distribution of linked marker alleles within the Malus gene pool (1999)
    Springer
    Theoretical and applied genetics 99 (1999), S. 1039-1046 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Key words Apple ; Scab resistance ; Introgression ; Vf gene ; DNA markers ; Linkage
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  A chromosomal region originating from Malus floribunda 821 confers Vf scab resistance to many isolates of Venturia inaequalis. Twelve DNA markers located in this region were used to scan the equivalent of 31 cM in 98 Malus accessions. This allowed a molecular diagnosis of a source of resistance in apple germplasm with the aid of pedigree information, and in the context of a limited marker survey representing other chromosomes. At least five marker alleles were present in all scab-resistant breeding selections or varieties arising from M. floribunda. The validity of findings based on RAPD markers was confirmed with SCAR assays and Southern-hybridisation experiments. The order of markers determined in previous mapping studies was confirmed and sets of recombinants identified that establish reliable fine-mapping orders within 0.7 cM of the resistance locus. None of the marker alleles were present in the accessions that are either susceptible or possess weak polygenic resistance to scab. The presence of some alleles corresponding to those present at least 5.3 cM from Vf in M. floribunda was detected in some accessions. Other major sources of scab resistance do not appear to possess alleles in common with the Vf region, which will simplify future allelism tests. The results are discussed in the context of the introgression of resistance loci together with marker-assisted selection. The use of breeding pedigrees to assist in fine-scale mapping and map-based cloning is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001220051412
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    RFLP and RAPD markers linked to the rosy leaf curling aphid resistance gene (Sd1) in apple (1997)
    Springer
    Theoretical and applied genetics 94 (1997), S. 528-533 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Key words Apple ; Dysaphis devecta ; Insect resistance ; Marker-assisted selection ; Molecular markers ; Plant breeding
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  Sd 1 is a dominant gene for resistance to biotypes 1 and 2 of the rosy leaf curling aphid, Dysaphis devecta Wlk., which can cause economic damage to apple trees. This report describes the identification of three RFLP and four RAPD markers linked to Sd 1 in a cross between the D. devecta susceptible variety ‘Prima’ (sd 1 sd 1) and the resistant variety ‘Fiesta’ (Sd 1 sd 1). Potted trees were artificially infested in the glasshouse, and the ratio of resistant:susceptible plants supported the hypothesis that the resistance was under the control of a single dominant gene. The position of the gene was mapped to a single locus on a ‘Fiesta’ chromosome, within 2 cM of three tightly linked RFLP markers (MC064a, 2B12a and MC029b); the four RAPD markers were located further away (between 13 and 46 cM). This is the first report of molecular markers for an aphid resistance gene in tree fruit crops. The potential application of these markers in a marker-assisted resistance breeding programme is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001220050447
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Sex-specific production of ipsdienol and myrcenol byDendroctonus ponderosae (Coleoptera: Scolytidae) exposed to myrcene vapors (1986)
    Springer
    Journal of chemical ecology 12 (1986), S. 1579-1586 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Dendroctonus ponderosae ; bark beetle ; Coleoptera ; Scolytidae ; myrcene ; aggregation pheromones ; ipsdienol ; myrcenol
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Male mountain pine beetles,Dendroctonus ponderosae Hopkins, produced ipsdienol [97.0% ± 0.3S-(+)] and myrcenol (90.3% ± 4.0E) when exposed to myrcene vapors. Females which were exposed to myrcene vapors did not produce any ipsdienol, but did produce low levels of myrcenol (98.0% ± 0.7E). Neither sex produced detectable levels of ipsdienol or myrcenol when fed for 24 hr on lodgepole pine,Pinus contorta var.latifolia Engelmann. The sex-specific conversion of myrcene to ipsdienol and myrcenol suggests that these compounds may have behavioral significance within the species. In addition, the S-(+)-ipsdienol produced by maleD. ponderosae probably functions as a repellent allomone againstIps pini (Say).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01020265
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    facet.materialart.
    Unbekannt
    Radiosensitivity of the vestibular apparatus of the rabbit (1965)
    In:  CASI
    Details
    Publikationsdatum: 2006-10-26
    Beschreibung: Radiosensitivity of vestibular apparatus of rabbit
    Schlagwort(e): BIOSCIENCES
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 8
    facet.materialart.
    Unbekannt
    Radiosensitivity of the vestibular apparatus of the rabbit (1965)
    In:  CASI
    Details
    Publikationsdatum: 2006-10-26
    Beschreibung: Radiosensitivity of rabbit vestibular apparatus after radiation exposure
    Schlagwort(e): BIOSCIENCES
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
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