Recent progress in the single-cell C₄ photosynthesis in terrestrial plants

Abstract

Currently, single-cell C₄ photosynthesis has been reported in four terrestrial plant species, Bienertia cycloptera, B. sinuspersici, B. kavirense and Suaeda aralocaspica, of family Chenopodiaceae. These species possess novel mechanisms of C₄ photosynthesis through spatial partitioning of organelles and key enzymes in distinct cytoplasmic domains within single chlorenchyma cells. Anatomical and biochemical studies have shown that the three Bienertia species and S. aralocaspica utilize biochemical and organellar compartmentation to achieve the equivalent spatial separation of Kranz anatomy but within a single photosynthetic cell. These discoveries have challenged the paradigm for C₄ photosynthesis in terrestrial plants which had suggested for more than 40 years that the Kranz feature was indispensably required for its C₄ function. In this review, we focus on the recent progress in understanding the cellular and molecular mechanisms that control the spatial relationship of organelles in these unique single-cell C₄ systems. The demonstrated interaction of dimorphic chloroplasts with microtubules and actin filaments has shed light on the importance of these cytoskeleton components in the intracellular partitioning of organelles. Future perspectives on the potential function of the cytoskeleton in targeting gene products to specific subcellular compartments are discussed.

Key words： C₄ plants; single-cell C₄ photosynthesis; Chenopodiaceae; dimorphic chloroplasts; organelle compartmentation; photosynthetic enzymes; cytoskeleton; protein targeting

Acknowledgments

This work was supported by grants from the Natural Sciences and Engineering Research Council of Canada (NSERC) and the University of Waterloo Start-Up Fund.

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