Journal
PLANT SIGNALING & BEHAVIOR
Volume 17, Issue 1, Pages -Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/15592324.2022.2114647
Keywords
parasitic plants; germination; strigolactones; nitrate; KAI2
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Funding
- Ministry of Education, Culture, Sports, Science and Technology KAKENHI [20H05909, 21H02506, 22H00364]
- Japan Society for the Promotion of Science (JSPS) KAKENHI [JP21J00718]
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Phtheirospermum japonicum, a facultative hemiparasitic plant, can germinate and grow in the presence or absence of the host, depending on the ambient nitrogen conditions and host-derived strigolactones (SLs).
Root parasitic plants in the family Orobanchaceae, such as Striga and Orobanche spp., infest major crops worldwide, leading to a multibillion-dollar loss annually. Host-derived strigolactones (SLs), recognized by a group of alpha/beta hydrolase receptors (KAI2d) in these parasites, are important determinants for germinating root parasitic plants near the roots of host plants. Phtheirospermum japonicum, a facultative hemiparasitic Orobanchaceae plant, can germinate and grow in the presence or absence of the host and can also exhibit root chemotropism to host-derived SLs that are perceived via KAI2d. However, the importance of SLs in P. japonicum germination remains unclear. In this study, we found that germination of P. japonicum was suppressed in the absence of nitrate ions and that germination of P. japonicum was promoted by exogenous strigol, an SL, under such conditions. We propose a model in which P. japonicum may select either independent living or parasitism in response to ambient nitrogen conditions and host presence.
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