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The role of strigolactones in host specificity of Orobanche and Phelipanche seed germination

Published online by Cambridge University Press:  08 December 2010

Mónica Fernández-Aparicio ,
Koichi Yoneyama  and
Diego Rubiales
Mónica Fernández-Aparicio
Affiliation:
Institute for Sustainable Agriculture, CSIC, Apdo. 4084, E-14080Córdoba, Spain Virginia Tech, Department of Plant Pathology, Physiology and Weed Science, Blacksburg, Virginia24061, USA
Koichi Yoneyama
Affiliation:
Weed Science Center, Utsunomiya University, 350 Mine-machi, Utsunomiya321-8505, Japan
Diego Rubiales*
Affiliation:
Institute for Sustainable Agriculture, CSIC, Apdo. 4084, E-14080Córdoba, Spain
*
*Correspondence Fax: +34 957499252 Email: [email protected]
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Abstract

Strigolactones are apocarotenoids regulating shoot branching. They are also known to be exuded by plant roots at very low concentrations, stimulating hyphal branching of arbuscular mycorrhizal fungi and germination of root parasitic weed seeds. We show that strigolactones play a major role in host specificity of Orobanche and Phelipanche (the broomrapes) seed germination. This observation confirms that host-derived germination stimulants are an important component determining the host specificity of these parasitic plants. Weedy broomrape species were less specialized in germination requirements than the non-weedy species except for O. cumana and O. foetida var. broteri. Similar results were obtained with the root exudates. Some species, such as P. aegyptiaca and O. minor, showed a broad spectrum of host specificity in terms of seed germination, which was stimulated by exudates from the majority of species tested, whereas others, such as O. cumana, O. hederae and O. densiflora, were highly specific. Some species, such as O. minor, P. aegyptiaca and P. nana, were responsive to the three strigolactones studied, whereas others were induced by only one of them, or did not respond to them at all. The synthetic strigolactone analogue GR24, generally used as a standard for germination tests, was not effective on some Orobanche and Phelipanche species. Seeds of some species that did not respond to GR24 were induced to germinate in the presence of fabacyl acetate or strigol, confirming the role of strigolactones in host specificity.

Keywords

broomrapefabacyl acetategerminationGR24parasitic plantsstrigol
Type
Short Communication
Information
Seed Science Research , Volume 21 , Issue 1 , March 2011 , pp. 55 - 61
Copyright
Copyright © Cambridge University Press 2010

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