Distinct Pathways of Regulation Seed Dormancy and Germination by Abscisic Acid- Juniper Publishers
Juniper Publishers- Journal of cell science Abscisic Acid (ABA) is the phytohormone inducing seed dormancy, whereas seed germination occurs at low ABA concentration. Two pathways of their regulation are considered. One represents ABA reception and its signal transduction to ABA-responsive genes to induce dormancy genes, a modification of this way leading to germination in the absence of ABA. Another way suggests direct ABA inhibition of plasmamembrane H+-ATPase in dormant seeds that prevents germination and its activation in the absence of ABA, thus promoting seed germination. Keywords: Seed dormancy; Germination; Transcription of dormancy genes; Activation of plasma membrane H+-ATPase. Introduction After the discovery of ABA receptors belonging to PYR/PYL/ RCAR protein family [1,2], and mechanism of their functioning [3], the components of signal system transducing the ABA signal to nuclear ABA-sensitive genes were identified [4,5]. According to the modern point of view, t
