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AOBPreview originally published online on March 12, 2003
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Annals of Botany 91: 637-642, 2003
© 2003 Annals of Botany Company

Genetic Relationships among Orobanche Species as Revealed by RAPD Analysis

B. ROMÁN1, C. ALFARO1, A. M. TORRES1, M. T. MORENO1, Z. SATOVIC2, A. PUJADAS3 and D. RUBIALES4

1 Departamento de Mejora y Agronomía CIFA-Alameda del Obispo, Apdo 3092, 14080 Córdoba, Spain, 2 Faculty of Agriculture, Department of Seed Science and Technology, Svetosimunska 25, 10000 Zagreb, Croatia, 3 Departamento de Ciencias y Recursos Agrícolas y Forestales, ETSIAM, Apdo 3048, 14080 Córdoba, Spain and 4 CSIC—Instituto de Agricultura Sostenible, Apdo. 4084, 14080 Córdoba, Spain

* For correspondence. E-mail belen.roman.ext{at}juntadeandalucia.es

Received: 17 October 2001; Returned for revision: 21 July 2002; Accepted: 7 January 2003    Published electronically: 12 March 2003

RAPD markers were used to study variation among 20 taxa in the genus Orobanche: O. alba, O. amethystea, O. arenaria, O. ballotae, O. cernua, O. clausonis, O. cumana, O. crenata, O. densiflora, O. foetida, O. foetida var. broteri, O. gracilis, O. haenseleri, O. hederae, O. latisquama, O. mutelii, O. nana, O. ramosa, O. rapum-genistae and O. santolinae. A total of 202 amplification products generated with five arbitrary RAPD primers was obtained and species-specific markers were identified. The estimated Jaccard’s differences between the species varied between 0 and 0·864. The pattern of interspecific variation obtained is in general agreement with previous taxonomic studies based on morphology, and the partition into two different sections (Trionychon and Orobanche) is generally clear. However, the position in the dendrogram of O. clausonis did not fit this classification since it clustered with members of section Trionychon. Within this section, O. arenaria was relatively isolated from the other members of the section: O. mutelii, O. nana and O. ramosa. Within section Orobanche, all O. ramosa populations showed a similar amplification pattern, whereas differences among O. crenata populations growing on different hosts were found. Orobanche foetida and O. densiflora clustered together, supporting the morphological and cytological similarities and the host preferences of these species.

Key words: Orobanche, RAPD, genetic relationships, genetic diversity.


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