The signaling peptide-encoding genes CLE16, CLE17 and CLE27 are dispensable for Arabidopsis shoot apical meristem activity.

The signaling peptide-encoding genes CLE16, CLE17 and CLE27 are dispensable for Arabidopsis shoot apical meristem activity.
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DOI:
10.1371/journal.pone.0202595
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发表时间:
2018
期刊:
影响因子:
3.7
通讯作者:
Fletcher JC
Fletcher JC
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Gregory EF;Dao TQ;Alexander MA;Miller MJ;Fletcher JC

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茎尖分生组织从其生长顶端的干细胞库中产生开花植物的所有叶、茎和花。在拟南芥中,小多肽信号分子CLAVATA3 (CLV3)是CLV3/胚胎周围区域相关(CLE)基因家族的成员,是在整个发育过程中维持茎部和花分生组织干细胞活性的负反馈回路的关键组成部分。由于在一些植物物种中,多个CLE基因参与调节茎尖分生组织的活性,我们验证了除CLV3基因外CLE基因可能在拟南芥干细胞稳态中起作用的假设。我们鉴定了3个表达于胚后茎尖分生组织的CLE基因,利用基因组编辑技术生成了功能缺失等位基因,并分析了突变植株的分生组织表型。我们发现,在正常生长条件下,CLE16、CLE17和CLE27的零突变既不影响营养和生殖芽分生组织的活性,尽管CLE27似乎略微延长了营养生长。我们的研究结果表明,CLE16、CLE17和CLE27基因在拟南芥茎尖分生组织中具有很大的冗余作用,并且/或仅在特定环境条件下调节分生组织的活性。
The shoot apical meristem produces all of the leaves, stems and flowers of a flowering plant from a reservoir of stem cells at its growing tip. In Arabidopsis, the small polypeptide signaling molecule CLAVATA3 (CLV3), a member of the CLV3/EMBRYO SURROUNDING REGION-RELATED (CLE) gene family, is a key component of a negative feedback loop that maintains stem cell activity in shoot and floral meristems throughout development. Because in some plant species multiple CLE genes are involved in regulating shoot apical meristem activity, we tested the hypothesis that CLE genes other than CLV3 might function in stem cell homeostasis in Arabidopsis. We identified three Arabidopsis CLE genes expressed in the post-embryonic shoot apical meristem, generated loss-of-function alleles using genome editing, and analyzed the meristem phenotypes of the resulting mutant plants. We found that null mutations in CLE16, CLE17 or CLE27 affected neither vegetative nor reproductive shoot meristem activity under normal growth conditions, although CLE27 appears to slightly prolong vegetative growth. Our results indicate that the CLE16, CLE17 and CLE27 genes have largely redundant roles in the Arabidopsis shoot apical meristem and/or regulate meristem activity only under specific environmental conditions.
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