PaperRSS文献速递|拟南芥胚胎发生过程中边界表达基因EPFL2编码信号肽的促进子叶生长

茎端器官边界边界在植物生长和形态建成中起着重要作用。据报道，一个编码富含半胱氨酸的 EPIDERMAL PATTERNING FACTOR-LIKE (EPFL)家族分泌肽的基因，EPFL2，在拟南芥胚子叶原基之间的边界区表达。然而，它的发育功能仍然是未知的。本研究旨在分析 EPFL2在胚胎发生过程中的作用。我们发现子叶生长在其功能缺失突变体中减少，这种表型与生长素反应峰在原基顶端的减少有关。突变体胚子叶大小的减小在萌发幼苗中得到恢复，说明在胚胎发生后期存在一个与 EPFL2相关的促进子叶生长的因子。我们的分析表明，子叶原基之间的边界域作为组织生长素反应峰和促进子叶生长的信号中心。

EPFL2pro: : GUS 基因的表达模式

The shoot organ boundaries have important roles in plant growth and morphogenesis. It has been reported that a gene encoding a cysteine-rich secreted peptide of the EPIDERMAL PATTERNING FACTOR-LIKE (EPFL) family, EPFL2, is expressed in the boundary domain between the two cotyledon primordia of Arabidopsis thaliana embryo. However, its developmental functions remain unknown. This study aimed to analyze the role of EPFL2 during embryogenesis. We found that cotyledon growth was reduced in its loss-of-function mutants, and this phenotype was associated with the reduction of auxin response peaks at the tips of the primordia. The reduced cotyledon size of the mutant embryo recovered in germinating seedlings, indicating the presence of a factor that acted redundantly with EPFL2 to promote cotyledon growth in late embryogenesis. Our analysis indicates that the boundary domain between the cotyledon primordia acts as a signaling center that organizes auxin response peaks and promotes cotyledon growth.

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