Browse

High temperature attenuates the gravitropism of inflorescence stems by inducing SHOOT GRAVITROPISM 5 alternative splicing in Arabidopsis

Cited 11 time in Web of Science Cited 12 time in Scopus
Authors
Kim, Joo-Young; Ryu, Jae Yong; Baek, Kon; Park, Chung-Mo
Issue Date
2016-01
Citation
New Phytologist, Vol.209 No.1, pp.265-279
Keywords
alternative splicingArabidopsis thalianahigh temperatureshoot gravitropismSHOOT GRAVITROPISM 5 (SGR5)thermotolerance
Abstract
In higher plants, gravitropism proceeds through three sequential steps in the responding organs: perception of gravity signals, signal transduction and asymmetric cell elongation. Light and temperature also influence the gravitropic orientation of plant organs. A series of Arabidopsis shoot gravitropism (sgr) mutants has been shown to exhibit disturbed shoot gravitropism. SGR5 is functionally distinct from other SGR members in that it mediates the early events of gravitropic responses in inflorescence stems. Here, we demonstrated that SGR5 alternative splicing produces two protein variants (SGR5 alpha and SGR5 beta) in modulating the gravitropic response of inflorescence stems at high temperatures. SGR5 beta inhibits SGR5 alpha function by forming non-DNA-binding heterodimers. Transgenic plants overexpressing SGR5 beta (35S:SGR5 beta) exhibit reduced gravitropic growth of inflorescence stems, as observed in the SGR5-deficient sgr5-5 mutant. Interestingly, SGR5 alternative splicing is accelerated at high temperatures, resulting in the high-level accumulation of SGR5 beta transcripts. When plants were exposed to high temperatures, whereas gravitropic curvature was reduced in Col-0 inflorescence stems, it was uninfluenced in the inflorescence stems of 35S:SGR5 beta transgenic plants and sgr5-5 mutant. We propose that the thermoresponsive alternative splicing of SGR5 provides an adaptation strategy by which plants protect the shoots from hot air under high temperature stress in natural habitats.
ISSN
0028-646X
URI
https://hdl.handle.net/10371/172017
DOI
https://doi.org/10.1111/nph.13602
Files in This Item:
There are no files associated with this item.
Appears in Collections:
College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
  • mendeley

Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse