Jorgensen Stacy A, Preston Jill C
Department of Plant Biology, The University of Vermont, 63 Carrigan Drive, Burlington, VT 05405, USA.
Department of Plant Biology, The University of Vermont, 63 Carrigan Drive, Burlington, VT 05405, USA.
Mol Phylogenet Evol. 2014 Apr;73:129-39. doi: 10.1016/j.ympev.2014.01.029. Epub 2014 Feb 7.
Evolutionary transitions in growth habit and flowering time responses to variable environmental signals have occurred multiple times independently across angiosperms and have major impacts on plant fitness. Proteins in the SPL family of transcription factors collectively regulate flowering time genes that have been implicated in interspecific shifts in annuality/perenniality. However, their potential importance in the evolution of angiosperm growth habit has not been extensively investigated. Here we identify orthologs representative of the major SPL gene clades in annual Arabidopsis thaliana and Mimulus guttatus IM767, and perennial A. lyrata and M. guttatus PR, and characterize their expression. Spatio-temporal expression patterns are complex across both diverse tissues of the same taxa and comparable tissues of different taxa, consistent with genic sub- or neo-functionalization. However, our data are consistent with a general role for several SPL genes in the promotion of juvenile to adult phase change and/or flowering time in Mimulus and Arabidopsis. Furthermore, several candidate genes were identified for future study whose differential expression correlates with growth habit and architectural variation in annual versus perennial taxa.
生长习性和开花时间对可变环境信号的响应在被子植物中多次独立发生进化转变，并对植物适应性产生重大影响。转录因子SPL家族中的蛋白质共同调控开花时间基因，这些基因与一年生/多年生的种间转变有关。然而，它们在被子植物生长习性进化中的潜在重要性尚未得到广泛研究。在这里，我们鉴定了一年生拟南芥和沟酸浆IM767以及多年生琴叶拟南芥和沟酸浆PR中主要SPL基因分支的直系同源基因，并对它们的表达进行了表征。在同一分类群的不同组织以及不同分类群的可比组织中，时空表达模式都很复杂，这与基因亚功能化或新功能化一致。然而，我们的数据与几个SPL基因在促进沟酸浆和拟南芥从幼年到成年的阶段转变和/或开花时间方面的普遍作用一致。此外，还鉴定了几个候选基因以供未来研究，它们的差异表达与一年生和多年生分类群的生长习性和结构变异相关。
