A Phloem-Expressed PECTATE LYASE-LIKE Gene Promotes Cambium and Xylem Development.
A Phloem-Expressed PECTATE LYASE-LIKE Gene Promotes Cambium and Xylem Development.
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韧皮部表达果胶裂解酶样基因促进形成层和木质部发育。
DOI：
10.3389/fpls.2022.888201
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发表时间：
2022
影响因子：
5.6
通讯作者：
Sablowski, Robert
中科院分区：
文献类型：
--
作者：
Bush, Max;Sethi, Vishmita;Sablowski, Robert
植物维管系统在水分和营养物质的运输中起着至关重要的作用，由木质部和韧皮部组成，木质部和韧皮部都起源于形成层中的未分化细胞。不同血管组织的发育由激素和肽信号协调，并在广泛的细胞壁修饰中达到高潮。果胶是细胞生长和分化过程中修饰的关键细胞壁组分，果胶片段在防御和细胞壁完整性途径中起信号作用，尽管它们作为发育信号的作用仍然是暂时的。在这里，我们表明，果胶裂解酶样基因PLL12所需的拟南芥花序茎中的维管束的生长。虽然PLL12主要在韧皮部中表达，但它也影响形成层和木质部的生长。令人惊讶的是，PLL12过表达诱导异位形成层和木质部分化的花序顶端和抑制叶脉管系统的发展。我们的研究结果提出了一种可能性，PLL12在韧皮部产生的细胞壁衍生的信号调节形成层和木质部的发展。
The plant vasculature plays essential roles in the transport of water and nutrients and is composed of xylem and phloem, both of which originate from undifferentiated cells found in the cambium. Development of the different vascular tissues is coordinated by hormonal and peptide signals and culminates in extensive cell wall modifications. Pectins are key cell wall components that are modified during cell growth and differentiation, and pectin fragments function as signals in defence and cell wall integrity pathways, although their role as developmental signals remains tentative. Here, we show that the pectin lyase-like gene PLL12 is required for growth of the vascular bundles in the Arabidopsis inflorescence stem. Although PLL12 was expressed primarily in the phloem, it also affected cambium and xylem growth. Surprisingly, PLL12 overexpression induced ectopic cambium and xylem differentiation in the inflorescence apex and inhibited development of the leaf vasculature. Our results raise the possibility that a cell wall-derived signal produced by PLL12 in the phloem regulates cambium and xylem development.
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