Effect of individual suppression of RBCS multigene family on Rubisco contents in rice leaves

Shun Ogawa, Yuji Suzuki, Ryuichi Yoshizawa, Keiichi Kanno, Amane Makino

    研究成果: Article査読

    35 被引用数 (Scopus)

    抄録

    In higher plants, a small subunit of Rubisco is encoded for by an RBCS multigene family in the nuclear genome. However, it is unknown how each multigene member contributes to the accumulation of Rubisco holoenzyme. Here, four RBCS genes that are highly expressed in leaf blaedes of rice (Oryza sativa L.) were individually suppressed by RNAi, and the effects on leaf Rubisco content were examined at seedling, vegetative and reproductive stages. Rubisco contents in each transgenic line declined irrespective of growth stage, and the ratios of Rubisco-N to total N were 66-96% of wild-type levels. The mRNA levels of the suppressed RBCS genes declined significantly, whereas those of the unsuppressed ones did not change drastically. These results indicate that four RBCS genes all contribute to accumulation of Rubisco holoenzyme irrespective of growth stage and that suppression of one RBCS gene is not fully compensated by other RBCS genes. Additionally, the mRNA levels of the large subunit of Rubisco showed a change similar to that of total RBCS mRNA level irrespective of genotype and growth stage. These results suggest that gene expression of RBCS and RBCL is regulated in a coordinated manner at the transcript level in rice. Although a small subunit of Rubisco in higher plants is encoded for by an RBCS multigene family in the nuclear genome, it is unknown how each multigene member contributes to accumulation of Rubisco holoenzyme. Here, four RBCS genes that are highly expressed in leaf blaedes of rice (Oryza sativa L.) were individually suppressed by RNAi. Rubisco contents in each transgenic line declined irrespective of growth stage. This result indicates that four RBCS genes all contribute to accumulation of Rubisco holoenzyme irrespective of growth stage and that suppression of one RBCS gene is not fully compensated by other RBCS genes.

    本文言語English
    ページ(範囲)546-553
    ページ数8
    ジャーナルPlant, Cell and Environment
    35
    3
    DOI
    出版ステータスPublished - 2012 3月

    ASJC Scopus subject areas

    • 生理学
    • 植物科学

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