NAIST 奈良先端科学技術大学院大学 バイオサイエンス領域

セミナー情報

Investigating regulatory mechanism of haustorium number and tissue invasion by parasitic plant

演題 Investigating regulatory mechanism of haustorium number and tissue invasion by parasitic plant
講演者 Dr. Songkui Cui (Specially-appointed Associate Professor, Division of Biological Science, Graduate School of Science and Technology, Nara Institute of Science and Technology)
使用言語 English
日時 2020年11月19日(木曜日) 10:00~10:45
場所 Zoom (please send an email to bsjimu-kyomu@bs.naist.jp for Zoom URL)
内容

Plant‐plant interaction is ubiquitous in nature and can be mutual or
commensal. Some plants have evolved parasitic relation with neighboring
plants during evolution by developing haustorium, a specialized organ that
absorbs nutrient from other plants, causing severe agricultural damage.
Initiation, tissue penetration and vascular connection of haustorium with
host plant involve a serial orders of signal perception, cell fate changes and
host cell wall modification; however, genetic control behind each process is
largely unexplored to data.

To understand the signaling pathways involved in haustorium development, a
genetic screening was conducted in a model root parasitic plant,
Phtheirospermum japonicum. In this seminar, I will introduce several P.
japonicum mutants, that have either altered haustorium number or defects
in host penetration. One of Haustorial Hair Defective (hhds) initially isolated
as root hair and haustorium hair defective mutants (1), showed increased
number of haustoria compared to the wild type. Using whole genome
sequencing, mutation loci is identified in a gene with homologous to
Arabidopsis ABCB4, encoding a plasma membrane protein of ABC transporter
family mediating auxin flux. Further analysis showed that PjABCB4 may
interact with ROS to fine‐control haustorium number. In addition, two
mutants bearing mutations respectively in ethylene receptor (PjETR1) and
ethylene signaling component (PjEIN2) showed impaired cell proliferation
and differentiation at haustorial apical region, resulting in abnormal
haustorium morphology and severe host invasion, indicating the crucial role
of ethylene signaling in host infection by parasitic plant via regulation of
haustorium development (2). Lastly, I will show the structural insight and
origin of haustorium inducing factors (HIFs) from host based on recent
investigation on lignin, a polymer conserved in the land plant (3, 4). These
studies form an important foundation for understanding molecular details
and evolution of plant parasitism.

問合せ先 植物細胞機能研究室
橋本 隆 (hasimoto@bs.naist.jp)

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