title: Os-GIGANTEA confers robust diurnal rhythms on the global transcriptome of rice in the field.
abstract: The circadian clock controls physiological traits such as flowering time, photosynthesis, and growth in plants under laboratory conditions. Under natural field conditions, however, little is known about the significance of the circadian clock in plants. By time-course transcriptome analyses of rice (Oryza sativa) leaves, using a newly isolated rice circadian clock-related mutant carrying a null mutation in Os-GIGANTEA (Os-GI), we show here that Os-GI controlled 75% (false discovery rate = 0.05) of genes among 27,201 genes tested and was required for strong amplitudes and fine-tuning of the diurnal rhythm phases of global gene expression in the field. However, transcripts involved in primary metabolism were not greatly affected by osgi. Time-course metabolome analyses of leaves revealed no trends of change in primary metabolites in osgi plants, and net photosynthetic rates and grain yields were not affected. By contrast, some transcripts and metabolites in the phenylpropanoid metabolite pathway were consistently affected. Thus, net primary assimilation of rice was still robust in the face of such osgi mutation-related circadian clock defects in the field, unlike the case with defects caused by Arabidopsis thaliana toc1 and ztl mutations in the laboratory.
authors.affiliation: Photosynthesis and Photobiology Research Unit, National Institute of Agrobiological Sciences, 2-1-2 Kannondai, Tsukuba, Japan. tizawa@nias.affrc.go.jp
authors.forename: Takeshi
authors.initials: T
authors.lastname: Izawa
authors.forename: Motohiro
authors.initials: M
authors.lastname: Mihara
authors.forename: Yuji
authors.initials: Y
authors.lastname: Suzuki
authors.forename: Meenu
authors.initials: M
authors.lastname: Gupta
authors.forename: Hironori
authors.initials: H
authors.lastname: Itoh
authors.forename: Atsushi J
authors.initials: AJ
authors.lastname: Nagano
authors.forename: Ritsuko
authors.initials: R
authors.lastname: Motoyama
authors.forename: Yuji
authors.initials: Y
authors.lastname: Sawada
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yano
authors.forename: Masami Yokota
authors.initials: MY
authors.lastname: Hirai
authors.forename: Amane
authors.initials: A
authors.lastname: Makino
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Nagamura
mesh_terms: D001483:Base Sequence; D057906:Circadian Clocks / Q000235:genetics* / Q000502:physiology / Q000528:radiation effects; D035264:Flowers / Q000235:genetics / Q000502:physiology / Q000528:radiation effects; D018506:Gene Expression Regulation, Plant / Q000235:genetics* / Q000528:radiation effects; D017343:Genes, Plant / Q000235:genetics; D008027:Light; D055432:Metabolomics; D008954:Models, Biological; D008969:Molecular Sequence Data; D009154:Mutation; D020411:Oligonucleotide Array Sequence Analysis; D012275:Oryza / Q000235:genetics* / Q000502:physiology / Q000528:radiation effects; D010641:Phenotype; D017440:Photoperiod; D018515:Plant Leaves / Q000235:genetics / Q000502:physiology; D010940:Plant Proteins / Q000235:genetics / Q000502:physiology*; D017422:Sequence Analysis, DNA; D013997:Time Factors; D059467:Transcriptome
chemical_list: D010940:Plant Proteins