[논문]Brassinosteroids-mediated regulation of ABI3 is involved in high-temperature induced early flowering in plants

Hong, Jeongeui; Sung, Jwakyung; Ryu, Hojin

doi:10.5010/jpb.2018.45.2.083

Brassinosteroids-mediated regulation of ABI3 is involved in high-temperature induced early flowering in plants 원문보기

Journal of plant biotechnology = 식물생명공학회지, v.45 no.2, 2018년, pp.83 - 89

Hong, Jeongeui (Department of Biology, Chungbuk National University) , Sung, Jwakyung (Division of Soil and Fertilizer, National Academy of Agricultural Science, RDA) , Ryu, Hojin (Department of Biology, Chungbuk National University)

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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 warmth-mediated regulation of ABI3 are important in thermomorphic reproductive phase transitions in plants.

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1999), suggesting other biological functions of ABI3 beyond to seed dormancy and early seedling developments. In this study, we demonstrate that high temperature mediated early flowering is tightly connected with BR signaling pathways. Also, the repression of ABI3 transcript and protein levels by high temperature are critically involved in warmth-induced thermomorphic early flowering time in Arabidopsis.

참고문헌 (29)

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Brassinosteroids-mediated regulation of ABI3 is involved in high-temperature induced early flowering in plants 원문보기

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Brassinosteroids-mediated regulation of ABI3 is involved in high-temperature induced early flowering in plants 원문보기

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