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Characterization of sunlight-grown transgenic rice plants expressing Arabidopsis phytochrome A

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Abstract

Transgenic rice (Oryza sativa) overexpressing Arabidopsis phytochrome A (phyA) was cultivated up to the T3 generation in paddy to elucidate the role of phyA in determining the plant architecture and the productivity of sunlight-grown rice plants. PhyA is light-labile and controls plant growth in response to the far-red light-dependent high-irradiance response as well as the very low fluence response. The Arabidopsis phyA gene linked to the rice rbcS promoter was transformed into embryogenic rice calli, and the calli were regenerated to whole plants. Compared to wild-type seedlings, the rbcS::PHYA transgenic seedlings contained more phyA when grown in the dark, and at least 10-fold more phyA when exposed to white light. When grown in paddy, the phyA transgenic plants in general exhibited reduced plant height (dwarfing), larger grain size, higher chlorophyll content, smaller tiller number, and low grain fertility compared to wild-type plants. The heading stage was not significantly changed. However, it is likely that a certain level of phyA is a prerequisite for induction of such changes. It is suggested that phyA overproduction in rice could be a useful tool to improve rice grain productivity by the larger grain size that increases grain yield and the dwarfing that tolerates lodging-associated damage.

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Author notes

  1. Sam-Geun Kong

    Present address: Department of Genetic Engineering, Japan

Authors and Affiliations

  1. Department of Genetic Engineering, Japan

    Dae-Seok Lee, Su-Nam Kwak & In-Soo Kim

  2. Department of Biological Science, Myongji University, Yongin, Kyonggi-do, 449-728, Korea

    Ju-Kon Kim

  3. Department of Agronomy, Kyungpook National University, Daegu, 702-701, Korea

    Jae-Keun Sohn

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  1. Sam-Geun Kong
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Kong, SG., Lee, DS., Kwak, SN. et al. Characterization of sunlight-grown transgenic rice plants expressing Arabidopsis phytochrome A. Molecular Breeding 14, 35–46 (2004). https://doi.org/10.1023/B:MOLB.0000037993.79486.7b

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  • DOI: https://doi.org/10.1023/B:MOLB.0000037993.79486.7b

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