Effects of overproduction of rubisco activase on rubisco content in transgenic rice grown at different N levels

Mao Suganami, Yuji Suzuki, Eri Kondo, Shinji Nishida, So Konno, Amane Makino

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22 Citations (Scopus)


It has been reported that overproduction of Rubisco activase (RCA) in rice (Oryza sativa L.) decreased Rubisco content, resulting in declining photosynthesis. We examined the effects of RCA levels on Rubisco content using transgenic rice with overexpressed or suppressed RCA under the control of different promoters of the RCA and Rubisco small subunit (RBCS) genes. All plants were grown hydroponically with different N concentrations (0.5, 2.0 and 8.0 mM-N). In RCA overproduced plants with > 2-fold RCA content (RCA-HI lines), a 10%–20% decrease in Rubisco content was observed at 0.5 and 2.0 mM-N. In contrast, at 8.0 mM-N, Rubisco content did not change in RCA-HI lines. Conversely, in plants with 50%–60% increased RCA content (RCA-MI lines), Rubisco levels remained unchanged, regardless of N concentration. Such effects on Rubisco content were independent of the promoter that was used. In plants with RCA suppression to < 10% of the wild-type RCA content, Rubisco levels were increased at 0.5 mM-N, but were unchanged at 2.0 and 8.0 mM-N. Thus, the effects of the changes in RCA levels on Rubisco content depended on N supply. Moreover, RCA overproduction was feasible without a decrease in Rubisco content, depending on the degree of RCA production.

Original languageEnglish
Article number1626
JournalInternational Journal of Molecular Sciences
Issue number5
Publication statusPublished - 2020 Mar 1


  • Nitrogen
  • Photosynthesis improvement
  • Rubisco
  • Rubisco activase
  • Rubisco activation
  • Transgenic rice


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