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Int. J. Mol. Sci. 2017, 18(10), 2225; doi:10.3390/ijms18102225

Transcriptomic Analysis of Gibberellin- and Paclobutrazol-Treated Rice Seedlings under Submergence

1
State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou 311400, China
2
Yuan LongPing High-TechAgriculture Co., Ltd., Changsha 410001, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 21 September 2017 / Revised: 16 October 2017 / Accepted: 19 October 2017 / Published: 24 October 2017
(This article belongs to the Special Issue Abiotic Stress and Gene Networks in Plants 2017)
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Abstract

Submergence stress is a limiting factor for rice growing in rainfed lowland areas of the world. It is known that the phytohormone gibberellin (GA) has negative effects on submergence tolerance in rice, while its inhibitor paclobutrazol (PB) does the opposite. However, the physiological and molecular basis underlying the GA- and PB-regulated submergence response remains largely unknown. In this study, we reveal that PB could significantly enhance rice seedling survival by retaining a higher level of chlorophyll content and alcohol dehydrogenase activity, and decelerating the consumption of non-structure carbohydrate when compared with the control and GA-treated samples. Further transcriptomic analysis identified 3936 differentially expressed genes (DEGs) among the GA- and PB-treated samples and control, which are extensively involved in the submergence and other abiotic stress responses, phytohormone biosynthesis and signaling, photosynthesis, and nutrient metabolism. The results suggested that PB enhances rice survival under submergence through maintaining the photosynthesis capacity and reducing nutrient metabolism. Taken together, the current study provided new insight into the mechanism of phytohormone-regulated submergence response in rice. View Full-Text
Keywords: rice (Oryza sativa L.); submergence; transcriptome; gibberellic acid; paclobutrazol rice (Oryza sativa L.); submergence; transcriptome; gibberellic acid; paclobutrazol
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Xiang, J.; Wu, H.; Zhang, Y.; Zhang, Y.; Wang, Y.; Li, Z.; Lin, H.; Chen, H.; Zhang, J.; Zhu, D. Transcriptomic Analysis of Gibberellin- and Paclobutrazol-Treated Rice Seedlings under Submergence. Int. J. Mol. Sci. 2017, 18, 2225.

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