Overexpression of rice OsLEA5 relieves the deterioration in seed quality caused by high-temperature stress

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  • Miyazaki Kaho
    Department of Biological Science and Technology, Tokyo University of Science
  • Ohkubo You
    Department of Biological Science and Technology, Tokyo University of Science
  • Yasui Hiroto
    Department of Biological Science and Technology, Tokyo University of Science
  • Tashiro Ryoka
    Department of Biological Science and Technology, Tokyo University of Science
  • Suzuki Rintaro
    Department of Biological Science and Technology, Tokyo University of Science
  • Teramura Hiroshi
    Department of Biological Science and Technology, Tokyo University of Science
  • Kusano Hiroaki
    Department of Biological Science and Technology, Tokyo University of Science
  • Shimada Hiroaki
    Department of Biological Science and Technology, Tokyo University of Science

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<p>Late embryogenesis abundant protein (LEA) genes are widely conserved in seed plant species and form a multigene family. While some LEAs are known to respond to environmental stresses, the function of many LEAs is unknown. OsLEA5 (Lea14A) interacts with a regulator of the endosperm storage production, FLO2, suggesting that OsLEA5 may be involved in endosperm quality control. RNAi knockdown line of OsLEA5 showed decreased seed weight. Transformant lines overexpressing OsLEA5 exhibited improved quality and seed weight of mature seeds when they were developed under high-temperature conditions, while seed quality strongly declined in wild-type plants exposed to high-temperature stress. These findings indicate that OsLEA5 contributes to suppressing the deterioration of seed quality when developed under high-temperature conditions.</p>

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