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Title: The effects of cross-tolerance to oxidative stress and drought stress on rice dry matter production under aerobic conditions
Authors: Iseki, Kohtaro
Homma, Koki
Shiraiwa, Tatsuhiko  kyouindb  KAKEN_id
Jongdee, Boonrat
Mekwatanakarn, Poonsak
Author's alias: 本間, 香貴
Keywords: Chlorophyll fluorescence
Cross-tolerance
Dry matter production
Leaf water potential
Membrane stability index
Stomatal conductance
Issue Date: Jul-2014
Publisher: Elsevier B.V.
Journal title: Field Crops Research
Volume: 163
Start page: 18
End page: 23
Abstract: Oxidative damage occurring in plant cells under drought stress is a known cause of reduced plant primary production. Decreasing oxidative damage through oxidative stress tolerance is expected to confer drought stress tolerance. In this study, we estimated cross-tolerance to oxidative stress and drought stress for breeding populations and analyzed the effects of the cross-tolerance on dry matter production in field experiments. For a total of 91 rice genotypes, including 72 backcross lines (BCLs), cross-tolerance was estimated from the first principal component score (PCS1) derived from a principal component analysis using a data set with a parameter of chlorophyll fluorescence and cell membrane stability index in both the oxidative and the drought stress treatments as the factors. The higher cross-tolerance was represented by the higher PCS1, and generally the values of PCS1 were segregated in the BCLs, suggesting that cross-tolerance is a heritable trait that can be improved by crossbreeding. The effects of positive and negative PCS1 on dry matter production under flooded and aerobic conditions were tested in field experiments. The decrease in dry matter production under aerobic conditions was smaller for the positive PCS1 genotypes. However, these genotypes also showed a lower stomatal conductance and smaller shoot biomass, especially under flooded conditions. We concluded that cross-tolerance is a useful trait for improving dry matter production, especially under severe drought stress. In view of the trade-offs between cross-tolerance and dry matter production, it is important to develop rice varieties with an optimal level of cross-tolerance for a target environment characterized by drought stress.
Rights: © 2014 Published by Elsevier B.V.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/189108
DOI(Published Version): 10.1016/j.fcr.2014.04.012
Appears in Collections:Journal Articles

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