Journal
NEW PHYTOLOGIST
Volume 206, Issue 3, Pages 983-989Publisher
WILEY
DOI: 10.1111/nph.13375
Keywords
arbuscular mycorrhizal (AM) fungi; community composition; compatibility; Striga spp; strigolactone; susceptibility; Zea mays (maize)
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Funding
- KAKENHI [22-9996]
- Program for Promotion of Basic and Applied Research for Innovations in Bio-oriented Industry
- JSPS Research Fellowship for Young Scientists
- Grants-in-Aid for Scientific Research [26292034, 15J40043, 26850069] Funding Source: KAKEN
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Strigolactones released from plant roots trigger both seed germination of parasitic weeds such as Striga spp. and hyphal branching of the symbionts arbuscular mycorrhizal (AM) fungi. Generally, strigolactone composition in exudates is quantitatively and qualitatively different among plants, which may be involved in susceptibility and host specificity in the parasite-plant interactions. We hypothesized that difference in strigolactone composition would have a significant impact on compatibility and host specificity/preference in AM symbiosis. Strigolactones in root exudates of Striga-susceptible (Pioneer 3253) and -resistant (KST 94) maize (Zea mays) cultivars were characterized by LC-MS/MS combined with germination assay using Striga hermonthica seeds. Levels of colonization and community compositions of AM fungi in the two cultivars were investigated in field and glasshouse experiments. 5-Deoxystrigol was exuded exclusively by the susceptible cultivar, while the resistant cultivar mainly exuded sorgomol. Despite the distinctive difference in strigolactone composition, the levels of AM colonization and the community compositions were not different between the cultivars. The present study demonstrated that the difference in strigolactone composition has no appreciable impact on AM symbiosis, at least in the two maize cultivars, and further suggests that the traits involved in Striga-resistance are not necessarily accompanied by reduction in compatibility to AM fungi.
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