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首页> 外文期刊>Journal of Experimental Botany >Softening-up mannan-rich cell walls.
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Softening-up mannan-rich cell walls.

机译：软化富含甘露聚糖的细胞壁。

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摘要

The softening and degradation of the cell wall (CW), often mannan enriched, is involved in several processes during development of higher plants, such as meristematic growth, fruit ripening, programmed cell death, and endosperm rupture upon germination. Mannans are also the predominant hemicellulosic CW polymers in many genera of green algae. The endosperm CWs of dry seeds often contain mannan polymers, sometimes in the form of galactomannans (Gal-mannans). The endo- beta-mannanases (MANs) that catalyse the random hydrolysis of the beta-linkage in the mannan backbone are one of the main hydrolytic enzymes involved in the loosening and remodelling of CWs. In germinating seeds, the softening of the endosperm seed CWs facilitates the emergence of the elongating radicle. Hydrolysis and mobilization of endosperm Gal-mannans by MANs also provides a source of nutrients for early seedling growth, since Gal-mannan, besides its structural role, serves as a storage polysaccharide. Therefore, the role of mannans and of their hydrolytic enzymes is decisive in the life cycle of seeds. This review updates and discusses the significance of mannans and MANs in seeds and explores the increasing biotechnological potential of MAN enzymes
机译：细胞壁（CW）的软化和降解（通常富含甘露聚糖）在高等植物发育过程中涉及多个过程，例如分生组织生长，果实成熟，程序性细胞死亡和发芽后的胚乳破裂。甘露聚糖也是许多绿藻中主要的半纤维素CW聚合物。干燥种子的胚乳CW通常包含甘露聚糖聚合物，有时呈半乳甘露聚糖形式（Gal-mannans）。催化甘露聚糖主链中β-键的随机水解的内切-β-甘露聚糖酶（MANs）是参与CW的松弛和重塑的主要水解酶之一。在发芽种子中，胚乳种子CW的软化促进了伸长胚根的出现。 MANs对胚乳半乳甘露聚糖的水解和动员也为早期幼苗生长提供了营养来源，因为半乳甘露聚糖除具有结构作用外，还可以作为贮藏多糖。因此，甘露聚糖及其水解酶的作用在种子的生命周期中起决定性作用。这篇综述更新并讨论了甘露聚糖和MAN在种子中的重要性，并探讨了MAN酶在生物技术方面的潜力

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