The role of strigolactones in host specificity of Orobanche and Phelipanche seed germination
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.
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2011
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dig-ias-es-10261-843222018-01-31T14:54:25Z The role of strigolactones in host specificity of Orobanche and Phelipanche seed germination Fernández-Aparicio, Mónica Yoneyama, Koichi Rubiales, Diego 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. This research was supported by projects P07-AGR- 02883 and AGL2008-01239/AGR, co-financed by European Regional Development (FEDER) fund. Peer Reviewed 2013-10-16T12:07:15Z 2013-10-16T12:07:15Z 2011 2013-10-16T12:07:15Z artículo http://purl.org/coar/resource_type/c_6501 issn: 0960-2585 e-issn: 1475-2735 Seed Science Research 21: 55-61 (2011) http://hdl.handle.net/10261/84322 10.1017/S0960258510000371 en http://dx.doi.org/10.1017/S0960258510000371 open Cambridge University Press |
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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. |
format |
artículo |
author |
Fernández-Aparicio, Mónica Yoneyama, Koichi Rubiales, Diego |
spellingShingle |
Fernández-Aparicio, Mónica Yoneyama, Koichi Rubiales, Diego The role of strigolactones in host specificity of Orobanche and Phelipanche seed germination |
author_facet |
Fernández-Aparicio, Mónica Yoneyama, Koichi Rubiales, Diego |
author_sort |
Fernández-Aparicio, Mónica |
title |
The role of strigolactones in host specificity of Orobanche and Phelipanche seed germination |
title_short |
The role of strigolactones in host specificity of Orobanche and Phelipanche seed germination |
title_full |
The role of strigolactones in host specificity of Orobanche and Phelipanche seed germination |
title_fullStr |
The role of strigolactones in host specificity of Orobanche and Phelipanche seed germination |
title_full_unstemmed |
The role of strigolactones in host specificity of Orobanche and Phelipanche seed germination |
title_sort |
role of strigolactones in host specificity of orobanche and phelipanche seed germination |
publisher |
Cambridge University Press |
publishDate |
2011 |
url |
http://hdl.handle.net/10261/84322 |
work_keys_str_mv |
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