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language
eng
Author
Shinonaga, Miwa
Yoshida, Haruka
Tomisaka, Kouhei
Akai, Kouhei
Description
Rice yield and quality decrease under high temperature conditions during the grain-filling period particularly in early-ripening cultivars that are directly subjected to midsummer heat. As the grain growth rate increases under high temperature conditions, the grain requires greater amounts of assimilates for the shortened grain-filling period and occasionally experiences a lack of assimilates. The stay-green trait that can maintain assimilation during the active grain-filling period is expected to mitigate the negative impact on grains due to the lack of assimilates. Our objectives were to evaluate the stay-green trait of rice maintaining assimilation rates under high temperature conditions during the active grain-filling period using the leaf incubation method. When whole leaves or leaf segments were floated on water at 20 - 40℃ under dark conditions, a leaf color reading (SPAD) showed steady genotypic differences at 25 - 35℃. When flag leaf segments of early-ripening cultivars from the Japanese Rice Collection (JRC) were incubated at 35℃ under dark conditions, the SPAD values of incubated leaves well reflected those in the top three-leaves in standing plants during the active grain-filling period (r = 0.774, p < 0.005). Under ambient and elevated temperature conditions (+3 - 4℃), the SPAD values and photosynthetic rates of genotypes that ranked higher for the trait by the leaf-incubation test, tended to be higher during the active grain-filling period. The results suggest that the leaf incubation method is suitable for the first-step selection of the stay-green trait of rice associated with the maintenance of assimilation rates under high temperature conditions during the grain-filling period.
Subject
High temperature
Leaf incubation
Photosynthesis
Rice
Stay-green
Journal Title
Plant Production Science
Volume
18
Issue
3
Start Page
254
End Page
266
ISSN
1343943X
Published Date
2015-12-03
DOI
NCID
AA11162156
Publisher
日本作物学会
Publisher Aalternative
The Crop Science Society of Japan
NII Type
Journal Article
Rights
Copyright © 2015 by The Crop Science Society of Japan
Gyoseki ID
e29694
OAI-PMH Set
Faculty of Life and Environmental Science
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