Tag: Hormones and Growth Regulators

The 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 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…

(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…

Strigalactones 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…

Zhang 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…

Much 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…

Plants 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…

Jasmonates 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…