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  • Coleoptera  (64)
  • pheromone  (46)
  • Wheat  (39)
  • Springer  (136)
  • Annual Reviews
  • 1985-1989  (73)
  • 1980-1984  (46)
  • 1975-1979  (17)
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  • Springer  (136)
  • Annual Reviews
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  • 1
    Electronic Resource
    Electronic Resource
    Isolation of feeding deterrents against argentine stem weevil from ryegrass infected with the endophyteAcremonium loliae (1986)
    Springer
    Journal of chemical ecology 12 (1986), S. 647-658 
    Details
    ISSN: 1573-1561
    Keywords: Perennial ryegrass ; Lolium perenne ; Gramineae ; Argentine stem weevil ; Listronotus bonariensis ; Coleoptera ; Curculionidae ; Acremonium loliae ; Acremonium coenophialum ; endophyte ; bioassay ; induced resistance ; feeding deterrent ; peramine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Infection of ryegrass (Lolium perenne) by an endophytic fungus (Acremonium loliae) confers resistance against the Argentine stem weevil (Listronotus bonariensis). Extracts from ryegrass clones, infected and uninfected withA. loliae, were compared in a feeding choice bioassay, and several fractions were identified which affected stem weevil feeding behavior. One stem weevil feeding deterrent, peramine C12H17N5O, has been isolated from infected ryegrass and partially characterized as a basic indole derivative. Extracts from culturedA. loliae had no effect on stem weevil feeding behavior nor was peramine detected in the fungal cultures examined. Peramine and the other active substances are hydrophilic in contrast to the lipophilic properties reported for the neurotoxic lolitrems also isolated from ryegrass infected withA. loliae and associated with causing ryegrass staggers disorder in livestock. It is suggested that ryegrass staggers and stem weevil feeding deterrency may arise by different biochemical mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01012099
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  • 2
    Electronic Resource
    Electronic Resource
    Ecdysteroids during pupal development of female Xyleborus ferrugineus (1981)
    Springer
    Entomologia experimentalis et applicata 30 (1981), S. 151-156 
    Details
    ISSN: 1570-7458
    Keywords: Xyleborus ferrugineus ; pupae ; ecdysteroids ; pharate adult ; radioimmunoassay ; Coleoptera ; Scolytidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Der Ecdysteroidtiter weiblicher Puppen von Xyleborus ferrugineus (Fabr.) wurde geschätzt, indem ganze Tiere homogenisiert und radioimmunologisch untersucht wurden. Ein ausgeprägtes Maximum an Ecdysteroiden wurde bei 36 Stunden Puppenent-wicklung beobachtet (743 pg/mg Körpergewicht). Der Titer nahm ab auf 299 pg/mg im Pharatstadium und auf 193 pg/mg unmittelbar vor Schlüpfen der Adulten. Qualitative Studien mit HPLC ergaben in frischen Puppen ein Verhältnis von 3:1 Ecdyson zu 20-Hydrooxyecdyson. Pharatstadien enthielten vor allem 20-Hydrooxyecdyson. Das beobachtete einzige Maximum im Titer stimmt überein mit den Resultaten bei andern untersuchten Coleopteren.
    Notes: Abstract Ecdysteroid titers were estimated on the whole body homogenates of Xyleborus ferrugineus (Fabr.) female pupae during development by radioimmunoassay. A distinct peak of ecdysteroids was observed at 36-hr pupal development (743 pg/mg body wt). Titer declined to 299 pg/mg by the pharate adult stage and to 193 pg/mg body wt just before adult emergence. Qualitative studies by HPLC revealed a ratio of 3:1 ecdysone to 20-hydroxyecdysone in the initial pupal stage. Pharate adults had mainly 20-hydroxyecdysone. The observed single peak in ecdysteroid titer agrees with findings in other studied coleopteran species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00300880
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  • 3
    Electronic Resource
    Electronic Resource
    Feeding by adult sweet potato weevils, Cylas formicarius elegantulus, on sweet potato leaves (1988)
    Springer
    Entomologia experimentalis et applicata 48 (1988), S. 157-163 
    Details
    ISSN: 1570-7458
    Keywords: sweet potato weevil ; Cylas formicarius elegantulus ; Coleoptera ; Curculionidae ; sweet potato ; Ipomoea batatas ; feeding ; host-plant preference ; leaf surface chemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé L'étude a porté sur la consommation pendant 12 h, en boîtes de Pétri de diamètre 9 cm, de rondelles de 2 cm de diamètre de feuilles de 4 cultivars,—Centennial, Jewel, Resisto, Regal—, d'I. batatas par C. formicarius elegantulus. Les charançons ont consommé le long des nervures, préférant la face inférieure à la face supérieure des feuilles. Un index de consommation a été calculé en fonction de la longueur de nervure ayant servi à la consommation, rapportée à la longueur totale des nervures de la surface exposée. Les niveaux de consommation des mâles et des femelles étaient semblables. En présence de choix binaires, le cultivar Centennial a été le plus consommé, et le cultivar Resisto, le moins, par les femelles. De telles préférences n'ont pas été observées en l'absence de choix. La composition chimique de la surface de la feuille a été analysée par chromatographie en phase gazeuse. 8 pics principaux identiques ont été observés chez les 4 cultivars, mais ils avaient différentes hauteurs.
    Notes: Abstract A bioassay was developed to quantify the feeding of adult sweet potato weevils, Cylas formicarius elegantulus (Summers) (Coleoptera; Curculionidae) on the foliage of four cultivars (Centennial, Jewel, Resisto and Regal) of sweet potato (Ipomoea batatas (L.) Lam.) (Convolvulaceae). Weevils fed along the leaf veins, preferring the lower to the upper leaf surface. Males and females had similar levels of feeding. Different levels of feeding by female weevils were observed between cultivars in dual-choice bioassays with Centennial, a susceptible cultivar in field-plot experiments, being most preferred and Resisto least preferred. However, these feeding differences were not observed in no-choice bioassays. Little difference was observed in the leaf surface chemistry of the four cultivars.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00185628
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  • 4
    Electronic Resource
    Electronic Resource
    Aggregation pheromone of square-necked grain beetle,Cathartus quadricollis (Guér.) (1988)
    Springer
    Journal of chemical ecology 14 (1988), S. 2169-2184 
    Details
    ISSN: 1573-1561
    Keywords: Cathartus quadricollis (Guér.) ; square-necked grain beetle ; Coleoptera ; Cucujidae ; aggregation pheromone ; (3R,6E)-7-methyl-6-nonen-3-yl acetate ; (E)-7-methyl-6-nonen-3-one ; (E)-7-methyl-6-nonen-3-ol ; (6E)-7-methyl-3-propyl-2,6-nonadienyl acetate ; 1-octen-3-ol ; repellent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract When feeding on rolled oats, male square-necked grain beetles,Cathartus quadricollis (Guér.), produced the aggregation pheromone (3R,6E)-7-methyl-6-nonen-3-yl acetate, for which the trival name “quadrilure” is proposed. The pheromone was highly attractive to both sexes in a two-choice, pitfall olfactometer modified to retain responding beetles by placing a food stimulus (an oat flake) in the glass vials containing the experimental and control stimuli. TheS enantiomer of the pheromone was inactive. Males also produced small amounts of (E)-7-methyl-6-nonen-3-one, (E)-7-methyl-6-nonen-3-ol, and (6E)-7-methyl-3-propyl-2,6-nonadienyl acetate, but these compounds were inactive in the laboratory bioassay. Segregated males and females both produced (R)-(−)-1-octen-3-ol, which by itself was repellent to both sexes but did not diminish beetle response to the aggregation pheromone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01014023
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  • 5
    Electronic Resource
    Electronic Resource
    Female pheromone in the black molly fish (Mollinenesia latipinna): A possible metabolic correlate (1977)
    Springer
    Journal of chemical ecology 3 (1977), S. 207-217 
    Details
    ISSN: 1573-1561
    Keywords: Black molly fish ; Mollinenesia latipinna ; pheromone ; thyroxine ; thiouracil ; general activity stimulus ; social contact
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The female black mollyMollinenesia latipinna emits a water-borne pheromone which increases general activity and social contacts among males. Two hormones, thyroxine and thiouracil, administered to the females increase these behaviors in males. Apparently the hormones do not functionally compete in this species, and both seem to elevate the emission of the male stimulant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00994147
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  • 6
    Electronic Resource
    Electronic Resource
    Defensive adaptations of eggs and adults ofGastrophysa cyanea (Coleoptera: Chrysomelidae) (1982)
    Springer
    Journal of chemical ecology 8 (1982), S. 453-462 
    Details
    ISSN: 1573-1561
    Keywords: Defensive secretions ; oleic acid ; hydrocarbons ; terpenoids ; eggs ; deterrents ; ants ; predation ; Chrysomelidae ; Coleoptera ; Gastrophysa cyanea ; reflex bleeding ; elytral glands
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Egg clusters and adults ofGastrophysa cyanea are conspicuous and, like their larvae, are chemically protected. The eggs owe their bright yellow color primarily to β-carotene and, in addition, contain substantial quantities of oleic acid. At natural concentrations oleic acid effectively deters many species of ants from feeding. The use of fatty acids as deterrents against ants is discussed as a possible widespread phenomenon among insects. During defensive confrontations, adults ofG. cyanea exhibit avoidance behavior and may also feign death. In addition, the adults may autohemmorhage or secrete a fluid from elytral or pronotal pores in response to traumatic stimuli. The secretions are effective against ants and contain a mixture of hydrocarbons as well as terpenoid components. The pattern of ontogenetic modification in the defensive chemical repertoire ofG. cyanea is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987793
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  • 7
    Electronic Resource
    Electronic Resource
    The effect of the crossability loci Kr1 and Kr2 on fertilization frequency in hexaploid wheat x maize crosses (1987)
    Springer
    Theoretical and applied genetics 73 (1987), S. 403-409 
    Details
    ISSN: 1432-2242
    Keywords: Wheat ; Maize ; Crossability genes ; Chromosome elimination ; Haploids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Dominant alleles of the Kr1 and Kr2 genes reduce the crossability of hexaploid wheat with many alien species, including rye and Hordeum bulbosum, with Kr1 having the greater effect. However, a cytological study of wheat ovaries fixed 48 h after pollination showed that the wheat genotypes ‘Highbury’ (kr1, Kr2) and ‘Chinese Spring (Hope 5B)’ (kr1, kr2) were crossable with ‘Seneca 60’ maize, fertilization occurring in 14.4 and 30.7% of embryo sacs respectively. The latter figure was similar to the 29.7% fertilization found in ‘Chinese Spring’ (kr1, kr2). Most embryo sacs in which fertilization occurred contained an embryo but lacked an endosperm and where an endosperm was formed it was usually highly aberrant. All three wheat x maize combinations were karyotypically unstable and rapidly eliminated maize chromosomes to produce haploid wheat embryos.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00262508
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  • 8
    Electronic Resource
    Electronic Resource
    Characterization of the multigene family coding for HMW glutenin subunits in wheat using cDNA clones (1983)
    Springer
    Theoretical and applied genetics 67 (1983), S. 87-96 
    Details
    ISSN: 1432-2242
    Keywords: HMW glutenin subunit genes ; cDNA clones ; Tandem DNA repeats ; Chromosomal location ; Gene copy number ; Wheat ; Triticum aestivum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary cDNA clones encoding wheat HMW glutenin subunits have been isolated from a cDNA bank made to poly A+ RNA from developing wheat endosperm var. Chinese Spring. One such clone, pTag 1290, has enabled us to identify the HMW glutenin mRNA species. The DNA sequence of this clone has been partially determined and it contains several tandem DNA repeats. The sequence is discussed in relation to the generation of the HMW glutenin subunit gene family. Analysis of the organization of the HMW glutenin sequences in the wheat genome revealed that the genes encoding HMW glutenin subunits exist in low copy number and are located on the long arm of each of the homoeologous group 1 chromosomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00303930
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  • 9
    Electronic Resource
    Electronic Resource
    The production of haploid wheat plants from wheat x maize crosses (1988)
    Springer
    Theoretical and applied genetics 76 (1988), S. 393-397 
    Details
    ISSN: 1432-2242
    Keywords: Wheat ; Maize ; Wide-crosses ; Embryo culture ; Haploids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Hybrid embryos from hexaploid wheat x maize crosses rapidly lose the maize chromosomes to produce haploid wheat embryos. Such embryos almost always aborted when left to develop on the plant, and only 1 was recovered from 2440 florets (0.17% of the expected number). Embryos had greater viability in spikelet culture, 47 (26.5% of the expected number) being recovered from 706 ovaries. Thirty-two of these embryos germinated to give green plants, 31 of which were haploid (21 wheat chromosomes) and 1 of which was euploid (42 wheat chromosomes). Spikelet culture enabled 17.1% of the expected number of embryos to be recovered as haploid plants, a 100-fold improvement on allowing embryos to develop in vivo. Ten haploid plants of ‘Chinese Spring’ (kr1, kr2), 13 plants of ‘Chinese Spring (Hope 5A)’ (kr1, Kr2), and 8 of ‘Hope’ (Kr1, Kr2) were recovered. The potential of wheat x maize crosses for wheat haploid production and for gene transfer from maize to wheat is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265339
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  • 10
    Electronic Resource
    Electronic Resource
    RFLP-based genetic maps of wheat homoeologous group 7 chromosomes (1989)
    Springer
    Theoretical and applied genetics 78 (1989), S. 495-504 
    Details
    ISSN: 1432-2242
    Keywords: Wheat ; Genetic mapping ; RFLPs ; Isozymes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Restriction fragment length polymorphism (RFLP) mapping was attempted using 18 cDNA clones, 14 anonymous and 4 of known function, which had been shown to have homologous DNA sequences on the group 7 chromosomes of wheat. The loci identified by these probes have been mapped on one or more chromosomes in this homoeologous group using linkage data derived from various F2, random inbred, doubled haploid and single chromosome recombinant populations. The maps also include three isozyme loci, five disease resistance loci, two anthocyanin pigment loci and a vernalisation response locus. The mapping data have been used to determine the extent of map co-linearity over the A, B and D genomes, the degree of RFLP variability in the three genomes and the relative efficiency of various restriction enzymes in detecting RFLPs in wheat. The strategy for future mapping in wheat, particularly the use of “alien” genomes or segments, such as that from Aegilops ventricosa used here, is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00290833
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