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

作者：Miyazaki Masayuki; Araki Masato; Okamura Kenta; Ishibashi Yushi^*; Yuasa Takashi; Iwaya Inoue Mari

来源：Journal of Plant Physiology, 2013, 170(18): 1579-1584.

DOI：10.1016/j.jplph.2013.06.011

• Grain quality
• Grain yield
• High temperature
• Nonstructural carbohydrates
• Sucrose transporter

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 %26apos;Genkitsukushf and heat-sensitive cultivar %26apos;Tsukushiroman%26apos;. When day/night temperatures were 31/26 degrees C from heading until maturity, the grain quality of %26apos;Genkitsukushi%26apos; was rated at the first inspection grade (high quality), whereas %26apos;Tsukushiroman%26apos; showed a remarkable increase in the percentage of white immature kernels (low quality). Nonstructural carbohydrate content in the stem of %26apos;Genkitsukushi%26apos; the early maturation was significantly higher than in %26apos;Tsukushiroman%26apos; 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 %26apos;Genkitsukushi%26apos; grown under high temperature than in %26apos;Tsukushiroman%26apos;. In addition, the expression of OsSUT1 in the grains of %26apos;Genkitsukushi%26apos; was significantly higher than in %26apos;Tsukushiroman%26apos; during the ripening peridd. These results indicate that sugar transport functions more effectively in `Genkitsukushi%26apos; than in %26apos;Tsukushiroman%26apos;, and that the effectiveness of sugar transport contributes to maintaining high grain quality in `Genkitsukushi%26apos; under high-temperature conditions.

• 出版日期2013-12-15