A Partnership for ABA Responses
The Plant Cell: In BriefThe phytohormone abscisic acid (ABA) regulates a variety of processes in plants including seed dormancy, seedling growth, and response to environmental stresses. A fascinating study by Ni et al. (2018) shows that ABA responses in rice are regulated by an interaction between the DMI3 kinase, which activates…
Auxin Function in a Brown Alga
Plant Physiology, Plant Physiology: On The InsideAuxin controls body plan patterning in land plants and it has been proposed to play a similar role in the development of brown algae (Phaeophyta) despite their distant evolutionary relationship with land plants. In flowering plants and many multicellular brown algae, the establishment of the apical-basal…
Scientists reveal the mechanism of mRNA polyadenylation in auxin and plant development
Blog, Plant Physiology
(Translated from the Chinese original)
Auxin is an important plant hormone that is essential for plant growth and development. At present, people's understanding of auxin signal transduction mainly focuses on the process of auxin receptor TIR1/AFBs- mediated Aux/IAAs protein degradation…
Structural motifs of D3-D14 ubiquitin ligase in strigolactone signaling (Nature)
Plant Science Research WeeklyStrigalactones are phytohormones that regulate plant growth and development processes. The α/β hydrolase D14 (metabolizes strigolactone) interacts with the F-box protein D3 to ubiquitinate and degrade the transcription repressor D53. This process inhibits shoot branching. However, it is still unknown…
Regulation of Apical Hook Development: A Dual-Core Processes Complex Information
Research, The Plant Cell, The Plant Cell: In a NutshellZhang et al. investigate the regulation of apical hook development in Arabidopsis thaliana. The Plant Cell (2018). https://doi.org/10.1105/tpc.18.00018.
By Xing Zhang, Yichuan Wang and Hongwei Guo.
Background: For sessile plants, survival in dynamic nature is never easy! The very first challenge…
Archetypal roles of an ABA receptor in drought and sugar responses in liverworts ($) (Plant Physiol)
Plant Science Research WeeklyMuch of our understanding of the molecular pathway for ABA response comes from studies on Arabidopsis. Thanks to genomic sequencing efforts, we know that this pathway is largely conserved amongst plants, including mosses. Jahan et al. extend this understanding to liverworts, drawing on the recently sequenced…
A conserved ABA signaling module regulates dormancy in liverworts (Curr Biol)
Plant Science Research WeeklyPlants can strategically maintain a state of dormancy to prevent germination and growth under unfavorable environmental conditions. In evolutionarily young lineages, dormancy is regulated by a canonical abscisic acid signalling pathway comprised of ABA receptors (PYR/PYL/RCAR), the negative regulator…
JAZ repressors of metabolic defense promote growth and reproductive fitness in Arabidopsis (Proc. Natl. Acad. Sci. USA)
Plant Science Research WeeklyJasmonates promote defense reponses but at the expense of growth. JAZ proteins repress jasmonate responses. Guo et al. examined the consequences of knocking out 10 of the 13 JAZ genes in Arabidopsis, by producing a jaz decuple, or jazD mutant. They compared jazD mutant to previously described jazQ mutants…
Integrated regulation of apical hook development by EIN3/EIL1 and PIFs ($) (Plant Cell)
Plant Science Research WeeklyThe apical hook helps to protect the fragile cotyledons and shoot apical meristem while pushing through the soil, and hook angle determines the success of emergence from soil. Multiple hormones and light signals have contrasting roles in the regulation of hook formation; e.g., auxin, ethylene and gibberellic…