Distinct and redundant roles of the Arabidopsis OCTOPUS gene family in plant growth beyond phloem development.

IF 5.6 2区 生物学 Q1 PLANT SCIENCES Journal of Experimental Botany Pub Date : 2025-01-11 DOI:10.1093/jxb/eraf010
Simona Crivelli, Kai Bartusch, M Aguila Ruiz-Sola, Mario Coiro, Signe Schmidt Kjølner Hansen, Elisabeth Truernit
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Abstract

The Arabidopsis root apical meristem is an excellent model for studying plant organ growth that involves a coordinated process of cell division, elongation, and differentiation, while each tissue type develops on its own schedule. Among these tissues, the protophloem is particularly important, differentiating early to supply nutrients and signalling molecules to the growing root tip. The OCTOPUS (OPS) protein and its homolog OPS-LIKE 2 (OPL2) are essential for proper root protophloem differentiation and, likely through this role, indirectly promote root growth. Here, we explored the roles of the other three OPS homologs in Arabidopsis, OPL1, OPL3, and OPL4. OPS/OPL genes exhibit overlapping expression patterns and functions, with a high degree of redundancy among them. Although higher-order mutants do not display more severe phloem defects, they exhibit significantly reduced root growth compared to the ops opl2 mutant. These results suggest a direct contribution of the investigated OPL genes to meristematic activity. While our focus was on root growth, the OPS/OPL gene family also plays a positive role in regulating shoot growth, emphasizing its broader impact on plant development. Furthermore, our analyses reiterate the central role of OPS and the phloem domain in controlling overall plant growth.

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拟南芥OCTOPUS基因家族在韧皮部以外的植物生长中的独特和冗余作用。
拟南芥根尖分生组织是研究植物器官生长的一个很好的模型,它涉及细胞分裂、伸长和分化的协调过程,而每种组织类型都有自己的发展时间表。在这些组织中,原生韧皮部尤为重要,它在早期分化,为生长中的根尖提供营养和信号分子。章鱼蛋白(OPS)及其同源蛋白OPS- like 2 (OPL2)对根原生皮正常分化至关重要,并可能通过这一作用间接促进根的生长。本研究探讨了另外三个OPS同源物OPL1、OPL3和OPL4在拟南芥中的作用。OPS/OPL基因表现出重叠的表达模式和功能,它们之间存在高度冗余。虽然高阶突变体没有表现出更严重的韧皮部缺陷,但与ops opl2突变体相比,它们的根生长明显减少。这些结果表明所研究的OPL基因对分生组织活性有直接的贡献。虽然我们的研究重点是根的生长,但OPS/OPL基因家族也在调节茎的生长中发挥积极作用,强调其对植物发育的广泛影响。此外,我们的分析重申了OPS和韧皮部域在控制植物整体生长中的核心作用。
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来源期刊
Journal of Experimental Botany
Journal of Experimental Botany 生物-植物科学
CiteScore
12.30
自引率
4.30%
发文量
450
审稿时长
1.9 months
期刊介绍: The Journal of Experimental Botany publishes high-quality primary research and review papers in the plant sciences. These papers cover a range of disciplines from molecular and cellular physiology and biochemistry through whole plant physiology to community physiology. Full-length primary papers should contribute to our understanding of how plants develop and function, and should provide new insights into biological processes. The journal will not publish purely descriptive papers or papers that report a well-known process in a species in which the process has not been identified previously. Articles should be concise and generally limited to 10 printed pages.
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