Apoplastic ROS production upon pollination by RbohH and RbohJ in Arabidopsis.
Reactive oxygen species (ROS) accumulate at the tip of growing pollen tubes. In Arabidopsis, NADPH oxidases RbohH and RbohJ are localized at the plasma membrane of pollen tube tip and produce ROS in a Ca(2+)-dependent manner. The ROS produced by Rbohs and Ca(2+) presumably play a critical role in the positive feedback regulation that maintains the tip growth. Ultrastructural cytochemical analysis revealed ROS accumulation in the apoplast/cell wall of the pollen grains on the stigmatic papillae in the wild type, but not in the rbohH rbohJ double mutant, suggesting that apoplastic ROS derived from RbohH and RbohJ are involved in pollen tube elongation into the stigmatic papillae by affecting the cell wall metabolism.
a Department of Applied Biological Science ; Tokyo University of Science ; Noda , Japan.
Hidetaka
H
Kaya
Megumi
M
Iwano
Seiji
S
Takeda
Masahiro M
MM
Kanaoka
Sachie
S
Kimura
Mitsutomo
M
Abe
Kazuyuki
K
Kuchitsu
D017360:Arabidopsis / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000378:metabolism*; D002563:Cerium / Q000378:metabolism; D005246:Feedback; D008954:Models, Biological; D019255:NADPH Oxidases / Q000378:metabolism*; D053205:Pollen Tube / Q000166:cytology / Q000378:metabolism; D054817:Pollination; D017382:Reactive Oxygen Species / Q000378:metabolism*
D029681:Arabidopsis Proteins; D017382:Reactive Oxygen Species; D002563:Cerium; D019255:NADPH Oxidases; C000593374:RBOHH protein, Arabidopsis; C000593375:RBOHJ protein, Arabidopsis
apoplast; arabidopsis thaliana; pollen tubes; reactive oxygen species; respiratory burst oxidase homolog