首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Cell suspension cultures of Populus tremula x P-tremuloides exhibit a high level of cellulose synthase gene expression that coincides with increased in vitro cellulose synthase activity
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Cell suspension cultures of Populus tremula x P-tremuloides exhibit a high level of cellulose synthase gene expression that coincides with increased in vitro cellulose synthase activity

机译:毛白杨x P-tremuloides的细胞悬浮培养物表现出高水平的纤维素合酶基因表达,与体外纤维素合酶活性增加相吻合

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Compared to wood, cell suspension cultures provide convenient model systems to study many different cellular processes in plants. Here we have established cell suspension cultures of Populus tremula L. x P. tremuloides Michx. and characterized them by determining the enzymatic activities and/or mRNA expression levels of selected cell wall-specific proteins at the different stages of growth. While enzymes and proteins typically associated with primary cell wall synthesis and expansion were detected in the exponential growth phase of the cultures, the late stationary phase showed high expression of the secondary-cell-wall-associated cellulose synthase genes. Interestingly, detergent extracts of membranes from aging cell suspension cultures exhibited high levels of in vitro cellulose synthesis. The estimated ratio of cellulose to callose was as high as 50 : 50, as opposed to the ratio of 30 : 70 so far achieved with membrane preparations extracted from other systems. The increased cellulose synthase activity was also evidenced by higher levels of Calcofluor white binding in the cell material from the stationary-phase cultures. The ease of handling cell suspension cultures and the improved capacity for in vitro cellulose synthesis suggest that these cultures offer a new basis for studying the mechanism of cellulose biosynthesis.
机译:与木材相比,细胞悬浮培养提供了方便的模型系统来研究植物中许多不同的细胞过程。在这里,我们建立了Populus tremula L. x P. tremuloides Michx的细胞悬浮培养。并通过确定选定的细胞壁特异性蛋白在不同生长阶段的酶促活性和/或mRNA表达水平来对其进行表征。虽然在培养物的指数生长期中检测到通常与原代细胞壁合成和扩增相关的酶和蛋白质,但晚期固定相显示出与次生细胞壁相关的纤维素合酶基因的高表达。有趣的是,来自老化的细胞悬浮培养物的膜的洗涤剂提取物表现出高水平的体外纤维素合成。到目前为止,纤维素与call糖的比例估计高达50:50,而到目前为止,从其他系统中提取的膜制剂所达到的比例为30:70。固定相培养物中细胞材料中较高水平的钙荧光白结合水平也证明了纤维素合酶活性的提高。易于处理细胞悬浮培养物和提高的体外纤维素合成能力表明,这些培养物为研究纤维素生物合成的机理提供了新的基础。

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