Hormonomic changes driving the negative impact of broomrape on plant host interactions with arbuscular mycorrhizal fungi

0553398 - ÚEB 2022 RIV CH eng J - Journal Article
Mishev, K. - Dobrev, Petre - Lacek, Jozef - Filepová, Roberta - Yuperlieva-Mateeva, B. - Kostadinova, A. - Hristeva, T.
Hormonomic changes driving the negative impact of broomrape on plant host interactions with arbuscular mycorrhizal fungi.
International Journal of Molecular Sciences. Roč. 22, č. 24 (2021), č. článku 13677. E-ISSN 1422-0067
R&D Projects: GA MŠMT(CZ) EF16_019/0000738
Institutional support: RVO:61389030
Keywords : Mycorrhizal fungi * Parasitic plants * Plant hormones * Rhizosphere * Root exudates * Small-molecule communication * Strigolactones
OECD category: Plant sciences, botany
Impact factor: 6.208, year: 2021
Method of publishing: Open access
http://doi.org/10.3390/ijms222413677

Belowground interactions of plants with other organisms in the rhizosphere rely on extensive small-molecule communication. Chemical signals released from host plant roots ensure the development of beneficial arbuscular mycorrhizal (AM) fungi which in turn modulate host plant growth and stress tolerance. However, parasitic plants have adopted the capacity to sense the same signaling molecules and to trigger their own seed germination in the immediate vicinity of host roots. The contribution of AM fungi and parasitic plants to the regulation of phytohormone levels in host plant roots and root exudates remains largely obscure. Here, we studied the hormonome in the model system comprising tobacco as a host plant, Phelipanche spp. as a holoparasitic plant, and the AM fungus Rhizophagus irregularis. Co-cultivation of tobacco with broomrape and AM fungi alone or in combination led to characteristic changes in the levels of endogenous and exuded abscisic acid, indole-3-acetic acid, cytokinins, salicylic acid, and orobanchol-type strigolactones. The hormonal content in exudates of broomrape-infested mycorrhizal roots resembled that in exudates of infested non-mycorrhizal roots and differed from that observed in exudates of non-infested mycorrhizal roots. Moreover, we observed a significant reduction in AM colonization of infested tobacco plants, pointing to a dominant role of the holoparasite within the tripartite system.
Permanent Link: http://hdl.handle.net/11104/0328344