Striga hermonthica,an obligate parasitic plant that causes severe agricultural damage,recognizes its hosts by sensing haustorium-inducing factors(HIFs).Perception of HIFs induces the rapid transformation of S.hermonth...Striga hermonthica,an obligate parasitic plant that causes severe agricultural damage,recognizes its hosts by sensing haustorium-inducing factors(HIFs).Perception of HIFs induces the rapid transformation of S.hermonthica radicles into prehaustoria,structures that enable host invasion and mature into haus-toria.HIFs consist of various aromatic compounds,including quinones,lignin monomers,andflavonoids.However,the downstream molecular pathways that orchestrate these developmental events are largely un-known.Here,we report that S.hermonthica root-tip cells rapidly deposit lignin,a major cell wall compo-nent,in response to HIFs.In addition to enhancing lignin levels,HIFs strongly induce genes involved in lignin monomer biosynthesis and polymerization,including several respiratory burst oxidase homologs(RBOHs)and class III peroxidases.Disruption of lignin monomer biosynthesis compromises prehaustorium formation,whereas HIF-induced class III peroxidases facilitate the process by promoting lignification.Our study demonstrates that cell wall lignification is a converged cellular process downstream of various HIFs that guides root meristematic cells in prehaustorium development.展开更多
在不同寄主植物繁殖的基础上,研究了檀香(Santalum album L.)幼苗对寄主植物的半寄生性。檀香种子发芽及幼苗生长初期,并不需要寄主植物的参与,但随后的生长其根系必须寄生于适宜的寄主植物的根上。不同寄主植物对檀香幼苗的生长和吸器...在不同寄主植物繁殖的基础上,研究了檀香(Santalum album L.)幼苗对寄主植物的半寄生性。檀香种子发芽及幼苗生长初期,并不需要寄主植物的参与,但随后的生长其根系必须寄生于适宜的寄主植物的根上。不同寄主植物对檀香幼苗的生长和吸器的发育影响不同,表现在根寄生吸器的数量、大小和结合的程度上。初步筛选了扶桑(H ibiscusrosa-sinensis)、烂头钵(Phyllanthus reticulatus)等优良的檀香幼苗寄主植物。檀香幼苗根系极不发达,细根缺乏根毛,但其导管非常发达,有利于从寄主根吸收养分和水分。此外还观察了檀香和寄主植物扶桑建立半寄生吸器的过程。展开更多
基金supported by the Japan Society for the Promotion of Science(JSPS)(KAKENHI grant numbers JP19K16169 to S.C.,JP20H05909 and JP21H02506 to S.Y.,and JP20H03044 and JP24K01827 to Y.T.)the National Natural Science Foundation of China(grant number 32370317 to S.C.)+3 种基金the Chinese Academy of Sciences("Introducing Talents Funds of Kunming Institute of Botany"to S.C.)the Yunnan Revitalization Talent Support Program("Young Talent"Project to S.C.)ST PRESTO(grant number JPMJPR194D to S.Y.)Y.T.-K.acknowledges the JSPS fellowship program(program number JP17J09654).
文摘Striga hermonthica,an obligate parasitic plant that causes severe agricultural damage,recognizes its hosts by sensing haustorium-inducing factors(HIFs).Perception of HIFs induces the rapid transformation of S.hermonthica radicles into prehaustoria,structures that enable host invasion and mature into haus-toria.HIFs consist of various aromatic compounds,including quinones,lignin monomers,andflavonoids.However,the downstream molecular pathways that orchestrate these developmental events are largely un-known.Here,we report that S.hermonthica root-tip cells rapidly deposit lignin,a major cell wall compo-nent,in response to HIFs.In addition to enhancing lignin levels,HIFs strongly induce genes involved in lignin monomer biosynthesis and polymerization,including several respiratory burst oxidase homologs(RBOHs)and class III peroxidases.Disruption of lignin monomer biosynthesis compromises prehaustorium formation,whereas HIF-induced class III peroxidases facilitate the process by promoting lignification.Our study demonstrates that cell wall lignification is a converged cellular process downstream of various HIFs that guides root meristematic cells in prehaustorium development.
文摘在不同寄主植物繁殖的基础上,研究了檀香(Santalum album L.)幼苗对寄主植物的半寄生性。檀香种子发芽及幼苗生长初期,并不需要寄主植物的参与,但随后的生长其根系必须寄生于适宜的寄主植物的根上。不同寄主植物对檀香幼苗的生长和吸器的发育影响不同,表现在根寄生吸器的数量、大小和结合的程度上。初步筛选了扶桑(H ibiscusrosa-sinensis)、烂头钵(Phyllanthus reticulatus)等优良的檀香幼苗寄主植物。檀香幼苗根系极不发达,细根缺乏根毛,但其导管非常发达,有利于从寄主根吸收养分和水分。此外还观察了檀香和寄主植物扶桑建立半寄生吸器的过程。
