Auxin signaling under abiotic stress conditions
- Title
- Auxin signaling under abiotic stress conditions
- Authors
- 남희재
- Date Issued
- 2023
- Publisher
- 포항공과대학교
- Abstract
- Root system architecture (RSA) plasticity is a key property that enables plants to cope with a
variety of abiotic stresses. The development of lateral root is known to be a major determinant of RSA
and is reduced during abiotic stresses because of decreased auxin responses. It has been reported that
the auxin distribution and the expression of auxin signaling regulators are changed under abiotic stress
conditions to reduce the auxin responses. However, the molecular function of auxin signaling regulator
proteins during stress conditions is poorly understood. Here, I show that the nucleo-cytoplasmic
distribution of AUXIN/INDOLE-3-ACETIC ACID INDUCIBLE (AUX/IAA) 12/19 proteins, negative
regulators of auxin signaling, determines lateral root development. Cytoplasmic localization of
IAA12/19 proteins in the elongation zone of roots enforces auxin signaling output, thus enabling lateral
root development. Among nuclear pore complex (NPC) components, CONSTITUTIVE EXPRESSOR
OF PATHOGENESIS-RELATED GENES 5 (CPR5) selectively mediates cytoplasmic translocation of IAA12/19 proteins. Under abiotic stress conditions, CPR5 expression is significantly reduced resulting
in accumulation of nuclear-localized IAA12/19 proteins in the elongation zone and suppression of
lateral root development, which is reiterated in the cpr5 mutant. Therefore, this study reveals a new
regulatory mechanism of auxin signaling in which the spatial distribution of AUX/IAA regulators is
critical for lateral root development, especially in fluctuating environmental condition.
- URI
- http://postech.dcollection.net/common/orgView/200000666846
https://oasis.postech.ac.kr/handle/2014.oak/118272
- Article Type
- Thesis
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