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Light-induced chloroplast movements in Oryza species

  • Regular Paper – Physiology/Biochemistry/Molecular and Cellular Biology
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Abstract

Light-induced chloroplast movements control efficient light utilization in leaves, and thus, are essential for leaf photosynthesis and biomass production under fluctuating light conditions. Chloroplast movements have been intensively analyzed using wild-type and mutant plants of Arabidopsis thaliana. The molecular mechanism and the contribution to biomass production were elucidated. However, the knowledge of chloroplast movements is very scarce in other plant species, especially grass species including crop plants. Because chloroplast movements are efficient strategy to optimize light capture in leaves and thus promote leaf photosynthesis and biomass, analysis of chloroplast movements in crops is required for biomass production. Here, we analyzed chloroplast movements in a wide range of cultivated and wild species of genus Oryza. All examined Oryza species showed the blue-light-induced chloroplast movements. However, O. sativa and its ancestral species O. rufipogon, both of which are AA-genome species and usually grown in open condition where plants are exposed to full sunlight, showed the much weaker chloroplast movements than Oryza species that are usually grown under shade or semi-shade conditions, including O. officinalis, O. eichingeri, and O. granulata. Further detailed analyses of different O. officinalis accessions, including sun, semi-shade, and shade accessions, indicated that the difference in chloroplast movement strength between domesticated rice plants and wild species might result from the difference in habitat, and the shape of mesophyll chlorenchyma cells. The findings of this study provide useful information for optimizing Oryza growth conditions, and lay the groundwork for improving growth and yield in staple food crop Oryza sativa.

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Acknowledgements

We thank Tomonao Matsushita (Kyoto University, Japan) and Bungo Shirouchi (Kyushu University, Japan) for research supports, and Taiki Akasaka (Kyushu University, Japan) and Hiroyasu Furuumi (National Institute of Genetics, Japan) for research assistance. We thank the Center for Advanced Instrumental and Educational Support of the Faculty of Agriculture, Kyushu University, Japan for confocal microscopy. This work was supported in part by the Grant-in-Aid for Scientific Research to EG (no. JP15K18713, JP18K14491 and JP19H04729), NS (no. JP15KK0254 and JP19K06721), YY (no. JP18K05576), and MW (no. JP20227001, JP23120523, JP25120721, and JP25251033) from the Japan Society for the Promotion of Science, by a Grant-in-Aid for a JSPS Research Fellow to TH (no. JP17J06717), by the Research Grant for Young Investigators of Kyushu University to EG, by the Research Grant for Ichimura Fundation for New Technology to EG, and by the Research Grant for Ohsumi Frontier Science Foundation to MW. The wild rice accessions used in this study were distributed from the National Institute of Genetics supported by the National Bioresource Project (NBRP), AMED, Japan.

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EG conceived the study. EG and NS designed the study. MK, TU, YY, YT, TH, TA, TK, and EG performed the experiments. MK, TU, YY, TK, MW, NS, and EG analyzed the data. NS and EG wrote the manuscript.

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Correspondence to Noriyuki Suetsugu or Eiji Gotoh.

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The authors declare no competing financial interests.

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Kihara, M., Ushijima, T., Yamagata, Y. et al. Light-induced chloroplast movements in Oryza species. J Plant Res 133, 525–535 (2020). https://doi.org/10.1007/s10265-020-01189-w

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  • DOI: https://doi.org/10.1007/s10265-020-01189-w

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