title: Transcription Profiles Reveal Sugar and Hormone Signaling Pathways Mediating Flower Induction in Apple (Malus domestica Borkh.).
abstract: Flower induction in apple (Malus domestica Borkh.) is regulated by complex gene networks that involve multiple signal pathways to ensure flower bud formation in the next year, but the molecular determinants of apple flower induction are still unknown. In this research, transcriptomic profiles from differentiating buds allowed us to identify genes potentially involved in signaling pathways that mediate the regulatory mechanisms of flower induction. A hypothetical model for this regulatory mechanism was obtained by analysis of the available transcriptomic data, suggesting that sugar-, hormone- and flowering-related genes, as well as those involved in cell-cycle induction, participated in the apple flower induction process. Sugar levels and metabolism-related gene expression profiles revealed that sucrose is the initiation signal in flower induction. Complex hormone regulatory networks involved in cytokinin (CK), abscisic acid (ABA) and gibberellic acid pathways also induce apple flower formation. CK plays a key role in the regulation of cell formation and differentiation, and in affecting flowering-related gene expression levels during these processes. Meanwhile, ABA levels and ABA-related gene expression levels gradually increased, as did those of sugar metabolism-related genes, in developing buds, indicating that ABA signals regulate apple flower induction by participating in the sugar-mediated flowering pathway. Furthermore, changes in sugar and starch deposition levels in buds can be affected by ABA content and the expression of the genes involved in the ABA signaling pathway. Thus, multiple pathways, which are mainly mediated by crosstalk between sugar and hormone signals, regulate the molecular network involved in bud growth and flower induction in apple trees.
authors.affiliation: College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: Li-Bo
authors.initials: LB
authors.lastname: Xing
authors.affiliation: College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Zhang
authors.affiliation: College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: You-Mei
authors.initials: YM
authors.lastname: Li
authors.affiliation: College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: Ya-Wen
authors.initials: YW
authors.lastname: Shen
authors.affiliation: College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: Cai-Ping
authors.initials: CP
authors.lastname: Zhao
authors.affiliation: College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: Juan-Juan
authors.initials: JJ
authors.lastname: Ma
authors.affiliation: College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: Na
authors.initials: N
authors.lastname: An
authors.affiliation: College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China hanmy@nwsuaf.edu.cn.
authors.forename: Ming-Yu
authors.initials: MY
authors.lastname: Han
mesh_terms: D035264:Flowers / Q000235:genetics / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant; D027845:Malus / Q000235:genetics / Q000378:metabolism*; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction / Q000235:genetics / Q000502:physiology
chemical_list: D010940:Plant Proteins
keywords: Cell cycle; Flower induction; Hormone signaling; Malus domestica; Sugar signaling