IPPS Admin

IPPS seminar and General Assembly July 5, 2023 at 4 PM cet

The 4th 2023 monthly IPPS seminar will be combined with the IPPS General Assembly on Wednesday 5 July at 4:00 pm central European time. We will have the following talks:

Elvin Elizabeth Mulaa – Genetic diversity, Virulence and Cross-host interactions of Striga hermonthica


Natsumi Aoki – Multiple signaling pathways for prehaustorium induction in Orobanchaceae parasitic plants

The seminars are followed by the annual General Assembly of the IPPS. On the agenda are:

  • Opening by the president of the IPPS, Harro Bouwmeester
  • Haustorium [Harro]
  • IPPS seminars [Jonne]
  • Membership and membership fee payment [Renate/Airong]
  • 17th WCPP 3-7 June 2024 [Satoko Yoshida]
  • The IPPS website [Harro]
  • Next General Assembly: 3-7 June 2024 during 17th WCPP
  • AOB
  • Closure

IPPS members can join the seminar and General Assembly using a Zoom link provided in the members area of the IPPS website. Not a member yet, but want to join the seminar? You can register here for an IPPS membership!

You can use this website for time zone conversion. 4:00 PM cet = 7:00 AM Los Angeles, 9:00 AM Bogota, 10:00 AM New York/Santiago, 11:00 PM Brasilia, 3:00 PM Abuja/London, 4:00 PM Amsterdam/Berlin/Cape Town, 5:00 PM Tel Aviv/Nairobi, 10:00 PM Beijing, (next day) 11:00 PM Tokyo, 0:00 AM Canberra (next day)

Natsumi Aoki:

2019-4 to 2021-3 Master student in Nara Institute of Science and Technology (supervisor: Satoko Yoshida, Plant Symbiosis group), obtained Master of Bioscience on 2021-3;
2021-04 to present, PhD candidate in Nara Institute of Science and Technology (supervisor: Satoko Yoshida, Plant Symbiosis group)

Abstract: Orobanchaceae parasitic plants are major threats to global food security, causing severe agricultural damage worldwide. Parasitic plants deprive water and nutrients from their host plants through multicellular organs called haustoria. The formation of a prehaustorium, a primitive haustorial structure, is provoked by host-derived haustorium-inducing factors (HIFs). Quinones, including 2,6-dimethoxy-p-benzoquinone (DMBQ), and phenolic compounds, including syringic acid, are among the most potent HIFs for various species in Orobanchaceae hemiparasites, whereas the phytohormone cytokinins were found to induce prehaustoria in the holoparasite Phelipanche ramosa. However, little is known about whether cytokinins act as HIFs for hemiparasitic species. Moreover, the overlap and differences in signaling pathways for quinones, phenolics and cytokinins in prehaustorium induction are not well understood. We have shown that cytokinins act as HIFs in Striga hermonthica but not in Phtheirospermum japonicum. Using chemical inhibitors for each type of HIF, we confirmed that the signaling pathways of DMBQ and cytokinin are independent in their perception, but converge downstream. Moreover, gene expression during prehaustorium induction by phenolic compounds was compared with that by quinones, indicating kinetic differences in gene induction by these HIFs. Our study revealed the presence of multiple signaling pathways for prehaustorium formation in Orobanchaceae parasitic plants, which may ensure the host infection by parasitic plants.

Elvin Elizabeth Mulaa: To be provided