Two phytohormones synergistically induce parasitic weeds seed germination via KAI2d receptors
Syzyju, T.; Ishikawa, T.; Burger, M.; Otani, M.; Miyamoto, K.; Jiang, W.; Kaku, H.; Kitaoka, N.; Matsuura, H.; Kuruma, M.; Nishiyama, K.; Seto, Y.
Show abstract
Root parasitic plants can severely decrease global crop production. The germination of their seeds is induced by host root-derived strigolactones (SLs). Considering this unique germination system, a "suicidal germination" method has been proposed to control root parasitic plants. However, this method requires the cost-effective production of germination inducers. In this study, we determined that jasmonates and SLs can synergistically induce the seed germination of root parasitic plants (Orobanche minor and Striga hermonthica). Biochemical analyses indicated that jasmonates and SLs cooperatively activate multiple divergent KARRIKIN INSENSITIVE 2 receptors. Our findings have elucidated the host recognition systems associated with these highly duplicated promiscuous receptors, with potential implications for developing a new strategy to protect crops against root parasitic plants.
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