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

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 temperatu...

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Veröffentlicht in:Journal of plant physiology 2013-12, Vol.170 (18), p.1579-1584
Hauptverfasser: Miyazaki, Masayuki, Araki, Masato, Okamura, Kenta, Ishibashi, Yushi, Yuasa, Takashi, Iwaya-Inoue, Mari
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container_end_page 1584
container_issue 18
container_start_page 1579
container_title Journal of plant physiology
container_volume 170
creator Miyazaki, Masayuki
Araki, Masato
Okamura, Kenta
Ishibashi, Yushi
Yuasa, Takashi
Iwaya-Inoue, Mari
description 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.
doi_str_mv 10.1016/j.jplph.2013.06.011
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subjects Adaptation, Physiological - genetics
Biomass
carbohydrate content
Carbohydrate Metabolism - genetics
cultivars
early development
Gene Expression Profiling
Gene Expression Regulation, Plant
genes
global warming
Grain quality
Grain yield
Grains
heading
heat stress
heat tolerance
High temperature
Hot Temperature
Membrane Transport Proteins - genetics
Membrane Transport Proteins - metabolism
night temperature
Nonstructural carbohydrates
Oryza - genetics
Oryza - growth & development
Oryza - physiology
Physiology
Plant Proteins - genetics
Plant Proteins - metabolism
Plant Stems - metabolism
Protein Transport
Rice
Ripening
seeds
Seeds - growth & development
Seeds - physiology
Stress, Physiological - genetics
Sucrose
Sucrose transporter
Sugars
Transport
Transporter
title Assimilate translocation and expression of sucrose transporter, OsSUT1, contribute to high-performance ripening under heat stress in the heat-tolerant rice cultivar Genkitsukushi
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