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Sci Rep. 2018 Nov 5;8(1):16346. doi: 10.1038/s41598-018-34608-z.

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

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Department of Plant and Soil Science, 219 Experimental Sciences Building, Texas Tech University, Lubbock, TX, 79409, USA.
Plant Genetics Laboratory, National Institute of Genetics, Mishima, Shizuoka, 411-8540, Japan.
King Abdullah University of Science and Technology (KAUST), Computational Bioscience Research Center (CBRC), Thuwal, 23955-6900, Saudi Arabia.
School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki-shi, Kanagawa, 214-8571, Japan.
Institute of Vegetable and Floriculture Science, National Agriculture and Food Research Organization, Mie, 514-2392, Japan.
Genome Informatics Laboratory, National Institute of Genetics, 1111 Yata, Mishima, Shizuoka, 411-8540, Japan.
Plant Breeding, Genetics and Biotechnology Division, International Rice Research Institute, Los Banos, Philippines.
Department of Plant and Soil Science, 219 Experimental Sciences Building, Texas Tech University, Lubbock, TX, 79409, USA.


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.

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