Expression of a delta 9 14:0-acyl carrier protein fatty acid desaturase gene is necessary for the production of omega 5 anacardic acids found in pest-resistant geranium (Pelargonium xhortorum).

Anacardic acids, a class of secondary compounds derived from fatty acids, are found in a variety of dicotyledonous families. Pest resistance (e.g., spider mites and aphids) in Pelargonium xhortorum (geranium) is associated with high levels (approximately 81%) of unsaturated 22:1 omega 5 and 24:1 omega 5 anacardic acids in the glandular trichome exudate. A single dominant locus controls the production of these omega 5 anacardic acids, which arise from novel 16:1 delta 11 and 18:1 delta 13 fatty acids. We describe the isolation and characterization of a cDNA encoding a unique delta 9 14:0-acyl carrier protein fatty acid desaturase. Several lines of evidence indicated that expression of this desaturase leads to the production of the omega 5 anacardic acids involved in pest resistance. First, its expression was found in pest-resistant, but not suspectible, plants and its expression followed the production of the omega 5 anacardic acids in segregating populations. Second, its expression and the occurrence of the novel 16:1 delta 11 and 18:1 delta 13 fatty acids and the omega 5 anacardic acids were specific to tall glandular trichomes. Third, assays of the recombinant protein demonstrated that this desaturase produced the 14:1 delta 9 fatty acid precursor to the novel 16:1 delta 11 and 18:1 delta 13 fatty acids. Based on our genetic and biochemical studies, we conclude that expression of this delta 9 14:0-ACP desaturase gene is required for the production of omega 5 anacardic acids that have been shown to be necessary for pest resistance in geranium.

Reflexions al voltant del fòrum de debat «Literatura i identitats: personals i col·lectives»

Aquest article recull les aportacions abocades al voltant de la literatura com a eina per construir les identitats, personals (de gènere i/o sexual) i col·lectives (i/o nacionals) en el fòrum de debat del II Simposi d’Ensenyament de la Literatura i la Llengua. A partir de la proposta de diverses preguntes bastírem ponts de conversa referents a qüestions com ara la formació del professorat en qüestions de gènere, l'explicitació o no a l'aula les diverses formes de desig sexual, el trencament dels tòpics masculí/femení, el paper cabdal de l'etnopoètica com a eina per construir la identitat nacional o la delimitació i popularització dels símbols i mites col·lectius. El text inclou també propostes de textos per a treballar a l'aula els aspectes sobre els quals reflexionem.

The Cambridge natural history,

Vols. 1, 2, 5-7, 9 reprinted 1922; v. 3, 1927; and vols. 4, 8, 10, 1923.

Monographie der arktischen Acariden /

Blank leaves bound between each leaf.

Coleccion completa de los tratados, convenciones, capitulaciones, armisticios y otros actos diplomáticos : de todos los estados de la América Latina : comprendidos entre el golfo de Méjico y el cabo de Hornos : desde el año de 1493 hasta nuestros dias ... /

Includes indexes.

Acarologists of the world: a directory.

Issued by the National Institutes of Health, Rocky Mountain Laboratory, Hamilton, Mont. and the Department of Zoology, University of Oklahoma.

[Mite reprints: General.]

Made-up set; supplied title.

Guatemala-Honduras boundary arbitration; reply of Guatemala to the counter case of Honduras submitted to the Arbitral tribunal composed of: the Hon. Charles Evans Hughes, chief justice of the United States of America; Hon. Luis Castro Ureña, from Costa Rica; Hon. Emilio Bello Codesdido, from Chile. Under treaty of July 16, 1930.

"Annex number 189. Report relating to the construction of the hypsometric map of the republic of Guatemala drawn under the supervision of the engineering staff of the Guatemala boundary commission, by order of the government of the republic": p. 178-183. Signed: Guatemala, September 29, 1928. Claudio Urrutia.

Studien an Acariden. /

Mode of access: Internet.

Zur Morphologie und Ontogenie der Acariden.

Mode of access: Internet.

The air sac mite of the fowl.

Reprinted from: American Veterinary Review, 1898, v. 22, p. 3-25.

Indian museum notes.

CONTENTS.--vol. I, no. 1. Notes on Indian insect pests. 1889. no. 2. Notes on Indian economic entomology. 1889. no. 3. Silkworms in India. 1890. no. 4. Notes on Indian economic entomology. 1890.--vol. II, no. 1. Economic entomology. 1891. no. 2. The wild silk insects of India. 1891. no. 3. On white insect wax in India. 1891. no. 4. The locusts of Bengal, Madras, Assam, and Bombay. 1891. no. 5. [Economic entomology, etc.] 1891. no. 6. A conspectus of the insects which affect crops in India. 1893.--vol. III, no. 1-3. [Notes on Indian insect pests, etc.] 1893-94. no. 4. An account of the insects and mites which attack the tea plant in India. 1895. no. 5-6. [Entomological notes] 1894-96.--vol. IV-vol. VI, no. 1. [Notes on Indian insect pests] 1896-1903.

Studies on Acari ...

Mode of access: Internet.