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Brassinosteroids-mediated regulation of ABI3 is involved in high-temperature induced early flowering in plant
J Plant Biotechnol 2018;45:83-89
Published online June 30, 2018
© 2018 The Korean Society for Plant Biotechnology.

Jeongeui Hong1, Jwakyung Sung2*, Hojin Ryu1*

1Department of Biology, Chungbuk National University, Cheongju 28644, Republic of Korea
2Division of Soil and Fertilizer, National Academy of Agricultural Science, RDA, Wanju 27715, Republic of Korea
Correspondence to: H. Ryu (✉) e-mail: hjryu96@chungbuk.ac.kr
J. Sung (✉) e-mail: jksung@korea.kr
Received June 21, 2018; Revised June 21, 2018; Accepted June 21, 2018.
cc This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The interplay of plant hormones is one of the essential mechanisms for plant growth and development. A recent study reported that Brassinosteroids (BR) and ABSCISIC ACID (ABA) interact antagonistically in early seedling developments through the BR-mediated epigenetic repression of ABSCISIC ACID-INSENSITIVE 3 (ABI3). However, the other physiological roles of the BR-mediated regulation of ABI3 and ABA responses beyond early seedling developments remain largely unknown. Here, we showed that the activation of BR signaling by high temperatures promotes flowering time through the suppression of ABI3 expressions. Elevated ambient temperature induced early flowering in wild type Col-0 plants, but not in BR-defective bri1-116 mutant plants. Conversely, a hyper BR biosynthetic dwf4-D mutant displayed more sensitive thermomorphic long shoot elongation and early flowering. Both expression patterns and physiological responses supported the biological roles of ABI3 in the regulation of floral transition and reproduction under high temperature conditions. Finally, we confirmed that the lowered expressions of the transcript and protein levels of ABI3 brought on by elevated temperature were correlated with warmth-induced early flowering phenotypes. In conclusion, our data suggest that the BR- and warmthmediated regulation of ABI3 are important in thermomorphic reproductive phase transitions in plants.
Keywords : High temperature, Brassinosteroids, ABI3, Plant hormone, Flowering


June 2018, 45 (2)
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