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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 20 (1972), S. 586-589 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Entomology 13 (1968), S. 257-294 
    ISSN: 0066-4170
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 223 (1969), S. 502-504 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] At present, insecticides provide the only practical method of controlling these pests, but recent experiments at the International Rice Research Institute have shown that some rice varieties have such strong natural resistance to these insects that chemical control may be unnecessary on these ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 287 (1977), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 12 (1969), S. 789-800 
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Eine Gesamtheit von 10000 Varietäten, die beim Internationalen Reis-Forschungs-Institut das Welt-Reis-Sortiment darstellen, wurde auf ihre Resistenz genenüber dem Gestreiften Stengelbohrer, Chilo suppressalis, in Feld-und Gewächshausversuchen geprüft. Unter diesen werden 20 als hochresistent bewertet. Die Resistenz scheint Nonpräferenz-und/oder Antibiosis-Charakter zu haben. Verschiedene morphologische und anatomische Eigenschaften der Pflanzen sollen in Beziehung zur Stengelbohrer-Resistenz stehen. Auf resistenten Pflanzen erleiden die Stengelbohrer-Larven hohe Mortalität, haben eine geringere Wachstumsrate, und ihre Körpergröße ist geringer als die von Larven, welche auf anfälligen Wirten aufgezogen wurden. Die selektierten resistenten Varietäten sind auch in einem Hybridisierungs-Programm benutzt worden, das die Stengelbohrer-Resistenz mit einem verbesserten Pflanzentyp und anderen wünschenswerten Eigenschaften zu verbinden sucht. Verschiedene Nachkommenschaften einer solchen Kreuzung zwischen TKM-6 (resistent gegen Stengelbohrer) und Peta3 x Taichung (wild) 1 (verbesserter Pflanzentyp) sind besonders vielversprechend. Sie haben einen verbesserten Pflanzentyp, sind widerstandsfähig gegen Stengelbohrer, tolerant gegen die Grüne Zwergzikade, Nephotettix cincticeps und die Braune Spornzikade, Nilaparvata lugens, und besitzen eine gewisse Resistenz gegen das Tungro-Virus, bakteriellen Blattmehltau, bakterielle Blattstreifen und lokale Rassen der Pestkrankheit. Sie haben hohe Ertragspotentiale und gute Kornqualität. Die Prüfung von etwa 1000 Reissorten führte zur Feststellung einiger Varietäten mit natürlicher Resistenz gegen die Braune Spornzikade und die Grüne Zwergzikade. Die Resistenz gegen die Braune Spornzikade scheint auf der Anwesenheit eines starken Repellents oder auf dem Fehlen eines Fraßstimulants in den Pflanzen zu beruhen, während die Resistenz gegen die Grüne Zwergzikade entweder eine Folge der Anwesenheit toxischer Stoffe oder minderer Nahrungsqualität der Pflanze für das Insekt ist.
    Notes: Abstract A total of 10,000 varieties, representing the world rice germ plasm collection at the International Rice Research Institute, were evaluated for their resistance to the striped borer, Chilo suppressalis Walker, in field and greenhouse experiments. From these, 20 varieties were recorded as highly resistant. The resistance appears to be non-preference and/or antibiosis in nature. Several plant morphological and anatomical characters have been recorded to be correlated with stem borer resistance. On resistant varieties, the borer larvae suffer high mortality, have a slower rate of growth, and their body-size is smaller than those of the larvae reared on susceptible hosts. The selected resistant varieties have been also used in a hybridization program which sought to combine stem borer resistance with improved plant type and other desirable characters. Several progenies of one such cross between TKM-6 (resistant to borers) and Peta3 x Taichung (Native) 1 (improved plant type) are particularly promising. They are of improved plant type, resistant to borers, tolerant to the green leafhopper, Nephotettix impicticeps and the brown planthopper, Nilaparvata lugens, and possess some resistance to the tungro virus, bacterial leaf blight, bacterial leaf streak and the local races of the blast disease. They have high yield potentials and fine-quality grains. The screening of about 1,000 rice varieties led to the identification of some varieties with natural resistance to the brown planthopper and to the rice green leafhopper. Resistance to the brown planthopper appears to be due to the presence of a strong repellent or a lack of feeding stimulus in the plants, while resistance to the green leafhopper is due either to the presence of toxic materials or nutritional deficiencies in the plant for the insect.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 27 (1980), S. 149-155 
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé L'acide oxalique, isolé des gaines foliaires du riz, a été identifie comme un puissant inhibiteur de la succion deNilaparvata lugens. Les oxalates de potassium et de sodium aux concentrations de 0,1% et 0,2% inhibent complètement la succion d'une solution de sucrose à 15%. Parmi les douze acides aliphatiques généralement présents dans la plante, seuls les acides oxalique, maleique et trans-aconique réduisent significativement à 0,1% l'activité de succion, tandis que les acides cycliques comme les acides citrique, malique et succinique n'ont pas d'effet inhibiteur.
    Notes: Abstract Oxalic acid, isolated from leaf sheath extract of rice, has been identified as a potent sucking inhibitor against the brown planthopper. Potassium and sodium oxalate at concentrations of 0.1%–0.2% completely inhibited sucking on a 15% sucrose solution. Of twelve aliphatic acids commonly present in plants, only oxalic, maleic, andtrans-aconitic acids at 0.1%, significantly reduced sucking activity while Krebs cycle acids, such as citric, malic, and succinic, did not have any inhibitory effect.
    Type of Medium: Electronic Resource
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