TY - JOUR
T1 - Comprehensive quantification and genome survey reveal the presence of novel phytohormone action modes in red seaweeds
AU - Mikami, Koji
AU - Mori, Izumi C.
AU - Matsuura, Takakazu
AU - Ikeda, Yoko
AU - Kojima, Mikiko
AU - Sakakibara, Hitoshi
AU - Hirayama, Takashi
N1 - Funding Information:
We are grateful to the Marine Resources Research Center of Aichi Fisheries Research Institute for kindly providing P. yezoensis strain U51. The hormone analysis reported herein was supported by the Japan Advanced Plant Science Network. This work was also supported in part by the Joint Research Program implemented at the Institute of Plant Science and Resources, Okayama University, Japan, and KAKENHI Grants (Nos. 2566016003 and 15H04539 to K.M.).
Publisher Copyright:
© Springer Science+Business Media Dordrecht 2015.
PY - 2016/8
Y1 - 2016/8
N2 - Emerging work has suggested the existence of phytohormones in seaweeds, although chemical species, endogenous biosynthetic pathways, and signal transduction machineries remain poorly understood. We performed profiling of nine phytohormones with liquid chromatography-mass spectrometry and in silico genome-wide homology search to identify genes involved in biosynthesis and signal transduction of hormones in red algae. It was demonstrated that two Bangiophycean algae, Bangia fuscopurpurea and Pyropia yezoensis, possessed indoleacetic acid (IAA), N6-(Δ2-isopentenyl)adenine (iP), abscisic acid (ABA), and salicylic acid, although trans-zeatin, dihydrozeatin, gibberellin A1 and A4, and jasmonate were not detected. Results of genome-wide survey demonstrated that Bangiophycean algae produce iP and ABA via pathways similar to those in terrestrial plants. However, these seaweeds lack homologues of already known factors participating in perception and signal transduction of IAA, iP, ABA and SA, indicating that the action modes of these phytohormones in red seaweeds differ from those elucidated in terrestrial plants. These findings shed lights on evolutional divergence of signal transduction pathways of phytohormones in plants.
AB - Emerging work has suggested the existence of phytohormones in seaweeds, although chemical species, endogenous biosynthetic pathways, and signal transduction machineries remain poorly understood. We performed profiling of nine phytohormones with liquid chromatography-mass spectrometry and in silico genome-wide homology search to identify genes involved in biosynthesis and signal transduction of hormones in red algae. It was demonstrated that two Bangiophycean algae, Bangia fuscopurpurea and Pyropia yezoensis, possessed indoleacetic acid (IAA), N6-(Δ2-isopentenyl)adenine (iP), abscisic acid (ABA), and salicylic acid, although trans-zeatin, dihydrozeatin, gibberellin A1 and A4, and jasmonate were not detected. Results of genome-wide survey demonstrated that Bangiophycean algae produce iP and ABA via pathways similar to those in terrestrial plants. However, these seaweeds lack homologues of already known factors participating in perception and signal transduction of IAA, iP, ABA and SA, indicating that the action modes of these phytohormones in red seaweeds differ from those elucidated in terrestrial plants. These findings shed lights on evolutional divergence of signal transduction pathways of phytohormones in plants.
KW - Bangia fuscopurpurea
KW - Comparative genomics
KW - Liquid chromatography-tandemmass spectrometry
KW - Phytohormone
KW - Pyropia yezoensis
KW - Quantitative profiling
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U2 - 10.1007/s10811-015-0759-2
DO - 10.1007/s10811-015-0759-2
M3 - Article
AN - SCOPUS:85032076703
VL - 28
SP - 2539
EP - 2548
JO - Journal of Applied Phycology
JF - Journal of Applied Phycology
SN - 0921-8971
IS - 4
M1 - 016
ER -