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language
eng
Author
Mitsui, Toshiaki
Yamakawa, Hiromoto
Description
High-temperature stress during grain filling hastens the growth rate of endosperm and causes grain chalkiness. Scanning microscopy of chalky areas reveals loosely packed, rounded starch granules with occasional small pits. Intensive investigation of the transcriptome, proteome, and metabolome in developing caryopses under high-temperature stress revealed the downregulation of starch synthesis enzymes and the upregulation of α-amylases. High-temperature ripening may unbalance the synthesis and degradation of starch in the developing endosperm cells. In addition to starches, storage proteins are synthesized, assembled, and stored in developing seeds. Several lines of evidence suggest that redox regulation affects seed maturation, including the accumulation of storage starches and proteins, and thus grain quality. A heat-tolerant cultivar of rice shows a characteristic high expression of superoxide dismutase (SOD). H_2O_2 produced by SOD under hightemperature stress possibly acts as a signal that rapidly can promote the expression of stressresponse proteins. Herein, we will discuss the possible molecular physiology of grain chalking under high-temperature stress.
Subject
Chalky grain
grain filling
Oryza sativa
starch synthesis and degradation
stress tolerance
reactive oxygen species
Journal Title
Plant Production Science
Volume
19
Issue
1
Start Page
22
End Page
29
ISSN
1343943X
Published Date
2016-02-27
DOI
NCID
AA11162156
Publisher
日本作物学会
Publisher Aalternative
The Crop Science Society of Japan
Taylor & Francis
NII Type
Journal Article
Rights
© 2016 The Author(s). Published by Taylor & Francis. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Gyoseki ID
e29695
OAI-PMH Set
Department of Agricultural and Forest Sciences, Faculty of Life and Environmental Science
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