Assimilate translocation and expression of sucrose transporter, OsSUT1, contribute to high-performance ripening under heat stress in the heat-tolerant rice cultivar Genkitsukushi

Masayuki Miyazaki, Masato Araki, Kenta Okamura, Yushi Ishibashi, Takashi Yuasa, Mari Iwaya-Inoue

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

High temperature reduces the grain quality of rice, a situation likely to become more frequent because of global warming. We studied the effects of high-temperature stress on grain quality of heat-tolerant cultivar 'Genkitsukushi' and heat-sensitive cultivar 'Tsukushiroman'. When day/night temperatures were 31/26. °C from heading until maturity, the grain quality of 'Genkitsukushi' was rated at the first inspection grade (high quality), whereas 'Tsukushiroman' showed a remarkable increase in the percentage of white immature kernels (low quality). Nonstructural carbohydrate content in the stem of 'Genkitsukushi' the early maturation was significantly higher than in 'Tsukushiroman' and greatly decreased under high temperature. From 14 to 21 days after heading, the expression of the sucrose transporter gene, OsSUT1, was higher in the stem of 'Genkitsukushi' grown under high temperature than in 'Tsukushiroman'. In addition, the expression of OsSUT1 in the grains of 'Genkitsukushi' was significantly higher than in 'Tsukushiroman' during the ripening period. These results indicate that sugar transport functions more effectively in 'Genkitsukushi' than in 'Tsukushiroman', and that the effectiveness of sugar transport contributes to maintaining high grain quality in 'Genkitsukushi' under high-temperature conditions.

Original languageEnglish
Pages (from-to)1579-1584
Number of pages6
JournalJournal of Plant Physiology
Volume170
Issue number18
DOIs
Publication statusPublished - Dec 15 2013

All Science Journal Classification (ASJC) codes

  • Physiology
  • Agronomy and Crop Science
  • Plant Science

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