Cytokinins were discovered in the search for factors that promoted division of plant cells in
culture. Naturally occurring cytokinins are N6-substituted adenine derivatives that generally …

Senescence is a highly regulated process, eventually leading to cell and tissue
disintegration: a physiological process associated with nutrient (eg nitrogen) redistribution …

Two-component signal transduction systems are abundant in prokaryotes. They enable cells
to adjust multiple cellular functions in response to changing environmental conditions …

Phytohormone brassinosteroids (BRs) play critical roles in plant growth and development.
BR acts by modulating the phosphorylation status of two key transcriptional factors, BRI1 …

The plant hormone cytokinin is perceived by membrane-located sensor histidine kinases.
Arabidopsis (Arabidopsis thaliana) possesses three cytokinin receptors: ARABIDOPSIS …

Leaf senescence is a type of postmitotic senescence. The onset and progression of leaf
senescence are controlled by an array of external and internal factors including age, levels …

Plant vascular cells originate from procambial cells, which are vascular stem cells. Recent
studies with Zinnia elegans cell culture and Arabidopsis thaliana mutants indicate that …

Cytokinin is known to have negative effects on de novo auxin‐induced root formation.
However, the regulatory mechanisms of root initiation by both cytokinin and auxin are poorly …

The B motif is a signature of type-B response regulators (ARRs) involved in His-to-Asp
phosphorelay signal transduction systems in Arabidopsis. Homologous motifs occur widely …

The action of phytohormones in plants requires the spatiotemporal regulation of their
accumulation and responses at various levels. Recent studies reveal an emerging …