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Front. Plant Sci. | doi: 10.3389/fpls.2019.01056

Haustorium inducing factors for parasitic Orobanchaceae

Vincent Goyet1,  Syogo Wada2,  Songkui Cui2, Takanori Wakatake3,  Ken Shirasu3, 4,  Gregory Montiel5,  Philippe Simier5 and  Satoko Yoshida2*
  • 1Université de Nantes, France
  • 2Nara Institute of Science and Technology (NAIST), Japan
  • 3RIKEN Center for Sustainable Resource Science (CSRS), Japan
  • 4The University of Tokyo, Japan
  • 5Laboratoire de Biologie et Pathologie Végétales, Université de Nantes, France

Parasitic plants in the Orobanchaceae family include devastating weed species, such as Striga, Orobanche and Phelipanche, which infest important crops and cause economic losses of over a billion US dollars worldwide, yet the molecular and cellular processes responsible for such parasitic relationships remain largely unknown. Parasitic species of the Orobanchaceae family form specialized invasion organs called haustoria on their roots to enable the invasion of host root tissues. The process of forming haustoria can be divided into two steps, prehaustorium formation and haustorium maturation, the processes occurring before and after host attachment, respectively. Prehaustorium formation is provoked by host-derived signal molecules, collectively called haustorium-inducing factors (HIFs). Cell wall-related quinones and phenolics have been known for a long time to induce haustoria in many Orobanchaceae species. Although such phenolics are widely produced in plants, structural specificities exist among these molecules that modulate their competency to induce haustoria in different parasitic plant species. In addition, the plant hormone cytokinins, structurally distinct from phenolic compounds, also trigger prehaustorium formation in Orobanchaceae. Recent findings demonstrate their involvement as rhizopsheric HIFs for Orobanche and Phelipanche species and thus address new activities for cytokinins in haustorium formation in Orobanchaceae, as well as in rhizospheric signaling. This review highlights haustorium-inducing signals in the Orobanchaceae family in the context of their host origin, action mechanisms, and species specificity.

Keywords: haustorium, Cytokinin, Parasitic Plant, Orobanchaceae, Lignin, Haustorium-inducing factor (HIF), quinone

Received: 20 May 2019; Accepted: 30 Jul 2019.

Copyright: © 2019 Goyet, Wada, Cui, Wakatake, Shirasu, Montiel, Simier and Yoshida. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Satoko Yoshida, Nara Institute of Science and Technology (NAIST), Ikoma, 630-0192, Nara, Japan, satokoy@bs.naist.jp