Potential of Oryza officinalis to augment the cold tolerance genetic mechanisms of Oryza sativa by network complementation

Ai Kitazumi, Isaiah C. M. Pabuayon, Hajime Ohyanagi, Masahiro Fujita, Bipush Osti, Matthew R. Shenton, Yusuke Kakei, Yasukazu Nakamura, Darshan S. Brar, Nori Kurata, Benildo G. De Los Reyes

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15 Scopus citations


Oryza officinalis is an accessible alien donor for genetic improvement of rice. Comparison across a representative panel of Oryza species showed that the wild O. officinalis and cultivated O. sativa ssp. japonica have similar cold tolerance potentials. The possibility that either distinct or similar genetic mechanisms are involved in the low temperature responses of each species was addressed by comparing their transcriptional networks. General similarities were supported by shared transcriptomic signatures indicative of equivalent metabolic, hormonal, and defense status. However, O. officinalis has maintained an elaborate cold-responsive brassinosteroid-regulated BES1-network that appeared to have been fragmented in O. sativa. BES1-network is potentially important for integrating growth-related responses with physiological adjustments and defenses through the protection of photosynthetic machinery and maintenance of stomatal aperture, oxidative defenses, and osmotic adjustment. Equivalent physiological processes are functional in O. sativa but their genetic mechanisms are under the direct control of ABA-dependent, DREB-dependent and/or oxidative-mediated networks uncoupled to BES1. While O. officinalis and O. sativa represent long periods of speciation and domestication, their comparable cold tolerance potentials involve equivalent physiological processes but distinct genetic networks. BES1-network represents a novel attribute of O. officinalis with potential applications in diversifying or complementing other mechanisms in the cultivated germplasm.
Original languageEnglish (US)
JournalScientific Reports
Issue number1
StatePublished - Nov 5 2018

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This research was supported by the National Science Foundation (NSF), Plant Genome Research Program (Grant 1602494), Bayer Crop Science Endowed Professorship to BGDR, and NIG-JOINT Research Fund (16B2012, 47B2014) from the National Institute of Genetics of Japan to NK and BGDR. All Oryza accessions were obtained from the Wide Hybridization Program of IRRI. We acknowledge the assistance of Joie Ramos, Junrey Amas, and Boyet Manalaysay for all experiments performed at IRRI. The O. officinalis accession W0002 for the CC-genome draft was obtained from the National Institute of Genetics through the National Bioresource Project of Japan. High-throughput computing was performed at the DNA Database of Japan (DDBJ), ROIS-NIG.


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