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Open AccessArticle

Comprehensive Transcriptomic Analysis of Auxin Responses in Submerged Rice Coleoptile Growth

by Yu-Sian Wu 1 and Chin-Ying Yang 1,2,*
Department of Agronomy, National Chung Hsing University, Taichung 40227, Taiwan
Pervasive AI Research (PAIR) Labs, Hsinchu 30010, Taiwan
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2020, 21(4), 1292;
Received: 8 January 2020 / Revised: 12 February 2020 / Accepted: 12 February 2020 / Published: 14 February 2020
Cultivating rice in wet or water direct seeding systems is simple and time and labor efficient. Rice (Oryza sativa) seeds are a unique cereal that can germinate not only when submerged, but also in anoxic conditions. Many complicated hormone signals interact in submerged seed germination. Ethylene is involved in rice coleoptile elongation, but little is known regarding the role of auxin signaling under submergence. This study demonstrated that the coleoptile is shorter and curlier when submerged with 2,3,5-triiodobenzoic acid (TIBA). In transcriptomic analysis, 3448 of the 31,860 genes were upregulated, and 4360 genes were downregulated with submergence and TIBA treatment. The Gene Ontology function classification results demonstrated that upregulated differentially expressed genes (DEGs) were mainly involved in redox, stress, and signal transduction, whereas the down-regulated DEGs were mainly involved in RNA transcription, stress, and development. Furthermore, auxin signaling involved in the carbohydrate metabolism pathway was demonstrated while using transcriptomic analysis and confirmed in a quantitative real-time polymerase chain reaction. In addition, the transcript levels of development-related genes and mitochondria-electron- transport-related genes were regulated by auxin signaling under submergence. Auxin signaling was not only involved in regulating rice coleoptile elongation and development, but also regulated secondary metabolism, carbohydrate metabolism, and mitochondria electron transport under submergence. Our results presented that auxin signaling plays an important role during rice coleoptile elongation upon the submergence condition and improving the advance of research of direct rice seeding system. View Full-Text
Keywords: rice coleoptile; transcriptomic analysis; submergence; auxin signaling; hormone rice coleoptile; transcriptomic analysis; submergence; auxin signaling; hormone
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Wu, Y.-S.; Yang, C.-Y. Comprehensive Transcriptomic Analysis of Auxin Responses in Submerged Rice Coleoptile Growth. Int. J. Mol. Sci. 2020, 21, 1292.

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