【摘 要】
:
Flower induction in apple(Malus domestica Borkh.)is regulated by complex genes networks that involve multiple signals pathways to ensure flower buds formation in the next year,but the molecular determ
【机 构】
:
College of Horticulture,Northwest A&F University,Yangling,Shaanxi 712100,China
论文部分内容阅读
Flower induction in apple(Malus domestica Borkh.)is regulated by complex genes networks that involve multiple signals pathways to ensure flower buds 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 available transcriptomic data,suggesting that sugar-,hormone-,and flowering-related genes,as well as those involved in cell-cycle induction participated in 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.
其他文献
肿瘤及肿瘤干细胞的发生与成体干细胞衰老、分化异常导致的恶性转化密切相关.DNA损伤应答系统是细胞维持基因组稳定的主要防御机制,近来在P53等DNA损伤应答分子的研究中发现DNA损伤应答系统在干细胞自稳中发挥多层面作用.XPC作为重要的DNA修复与细胞周期调控分子,其异常可导致多种肿瘤发生,但XPC在干细胞自稳中的角色尚未探及.
DNA双链断裂(DSBs)是一种严重的DNA损伤类型.为了维持基因组的稳定性,真核生物的DNA通过与组蛋白结合进化出更为复杂紧密的染色质结构.然而这种致密的结构对于DNA的转录,复制和修复等代谢过程是一个巨大的障碍.BRG1是染色质重塑复合物SWI/SNF的核心亚基,它具有ATP水解酶活性.已有研究发现BRG1与肿瘤发生和基因组不稳定性具有重要联系.
Spontaneous regression of neuroblastoma (NB) resembles the developmentally regulated programmed cell death (PCD) of sympathetic neurons.
Extracellular proteins are vital for cell activities, including cell migration.Calumenin is highly conserved among eukaryotes, but its functions are largely unclear.
Small non-coding RNAs (ncRNA) play important roles in diverse cellular processes, but little is known about their identities and expression dynamics during fertilization and early embryonic developmen
Phytosterols are membrane components or precursors for biosynthesis of brassinosteroids(BRs).Since they are not able to be long-distance transported,their homeostasis is tightly controlled by biosynth
Brassinosteroids(BRs)are a group of naturally occurring plant hormones regulating many cellular and physiological processes during normal growth and development.cog1-2D was identified as an activation
在长期的进化历程中,植物为抵抗不同的环境胁迫,自身形成了各种各样的机制来应对不利的环境,包括在形态,生理和生化等方面的适应,在适应胁迫的过程中植物激素脱落酸(ABA)起着重要的作用.bHLH(basic helix-loop-helix)转录因子家族成员众多仅次于MYB 类转录因子家族.有限的研究表明bHLH 转录因子不仅对植物的生长发育必不可缺,还参与植物次生代谢以及ABA 信号转导等过程.本研
Auxin,cytokinin(CK),and strigolactone(SL)interact to regulate shoot branching.CK has long been considered to be the only key phytohormone to promote lateral bud development.Here we report that gibbere
人们普遍认为植物地上部分的分枝特性主要受生长素(auxin)、细胞分裂素(cytokinin,CK)和独脚金内酯(strigolactone,SL)三种激素的调控,其中CK 长期被认为是唯一的可促进分枝的激素。但赤霉素(gibberellin,GA)在分枝调控方面的作用一直被忽视。我们最近的研究结果表明GA 可以显著地促进小桐子(Jatropha curcas)和番木瓜(Carica papaya