A genetic network mediating the control of bud break in hybrid aspen

• Published in: Nature communications Vol. 9; no. 1; pp. 4173 - 10
• Main Authors: Singh, Rajesh Kumar, Maurya, Jay P., Azeez, Abdul, Miskolczi, Pal, Tylewicz, Szymon, Stojkovič, Katja, Delhomme, Nicolas, Busov, Victor, Bhalerao, Rishikesh P.
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 09.10.2018; Nature Publishing Group; Nature Portfolio
• Subjects: 38/1; 38/15; 38/39; 38/77; 38/88; 38/90; 42; 42/89; 45; 45/15; 631/449/1659; 631/449/1736; 631/449/2675; Abscisic acid; Abscisic Acid - pharmacology; Activation; Arabidopsis; Biosynthesis; Biosynthetic Pathways - drug effects; Biosynthetic Pathways - genetics; Botanik; Botany; Cell cycle; Cold Temperature; Flowers - genetics; Gene Expression Regulation, Plant - drug effects; Gene Regulatory Networks; Genes, Plant; Gibberellic acid; Gibberellins - pharmacology; Homology; Humanities and Social Sciences; Hybridization, Genetic; Low temperature; Models, Biological; multidisciplinary; Plant Proteins - genetics; Plant Proteins - metabolism; Populus - genetics; Regulation; Regulators; RNA Interference; Science; Science (multidisciplinary); Signal Transduction - drug effects; Temperature effects; Transcription factors; Transcription Factors - genetics; Transcription Factors - metabolism
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/s41467-018-06696-y

In boreal and temperate ecosystems, temperature signal regulates the reactivation of growth (bud break) in perennials in the spring. Molecular basis of temperature-mediated control of bud break is poorly understood. Here we identify a genetic network mediating the control of bud break in hybrid aspen. The key components of this network are transcription factor SHORT VEGETATIVE PHASE-LIKE (SVL) , closely related to Arabidopsis floral repressor SHORT VEGETATIVE PHASE , and its downstream target TCP18 , a tree homolog of a branching regulator in Arabidopsis. SVL and TCP18 are downregulated by low temperature. Genetic evidence demonstrates their role as negative regulators of bud break. SVL mediates bud break by antagonistically acting on gibberellic acid (GA) and abscisic acid (ABA) pathways, which function as positive and negative regulators of bud break, respectively. Thus, our results reveal the mechanistic basis for temperature-cued seasonal control of a key phenological event in perennial plants. Molecular mechanism of how temperature-mediated control of bud break in perennial plants remains unclear. Here, the author show that transcriptional factor SHORT VEGETATIVE PHASE-LIKE and its downstream target TCP18 are negative regulators of hybrid aspen bud break.