Os-GIGANTEA confers robust diurnal rhythms on the global transcriptome of rice in the field

Takeshi Izawa, Motohiro Mihara, Yuji Suzuki, Meenu Gupta, Hironori Itoh, Atsushi J. Nagano, Ritsuko Motoyam, Yuji Sawad, Masahiro Yano, Masami Yokota Hirai, Amane Makino, Yoshiaki Nagamurad

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94 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1741-1755
Number of pages15
JournalPlant Cell
Volume23
Issue number5
DOIs
Publication statusPublished - 2011 May 1

ASJC Scopus subject areas

  • Plant Science
  • Cell Biology

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    Izawa, T., Mihara, M., Suzuki, Y., Gupta, M., Itoh, H., Nagano, A. J., Motoyam, R., Sawad, Y., Yano, M., Hirai, M. Y., Makino, A., & Nagamurad, Y. (2011). Os-GIGANTEA confers robust diurnal rhythms on the global transcriptome of rice in the field. Plant Cell, 23(5), 1741-1755. https://doi.org/10.1105/tpc.111.083238