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首页> 外文期刊>Journal of Experimental Botany >Protein expression in tension wood formation monitored at high tissue resolution in Populus
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Protein expression in tension wood formation monitored at high tissue resolution in Populus

机译:张力木形成中的蛋白质表达,在杨树的高组织分辨率下监测

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Tension wood (TW) is a specialized tissue with contractile properties that is formed by the vascular cambium in response to gravitational stimuli. We quantitatively analysed the proteomes of Populus tremula cambium and its xylem cell derivatives in stems forming normal wood (NW) and TW to reveal the mechanisms underlying TW formation. Phloem-, cambium-, and wood-forming tissues were sampled by tangential cryosectioning and pooled into nine independent samples. The proteomes of TW and NW samples were similar in the phloem and cambium samples, but diverged early during xylogenesis, demonstrating that reprogramming is an integral part of TW formation. For example, 14-3-3, reactive oxygen species, ribosomal and ATPase complex proteins were found to be up-regulated at early stages of xylem differentiation during TW formation. At later stages of xylem differentiation, proteins involved in the biosynthesis of cellulose and enzymes involved in the biosynthesis of rhamnogalacturonan-I, rhamnogalacturonan-II, arabinogalactan-II and fasciclin-like arabinogalactan proteins were up-regulated in TW. Surprisingly, two isoforms of exostosin family proteins with putative xylan xylosyl transferase function and several lignin biosynthesis proteins were also up-regulated, even though xylan and lignin are known to be less abundant in TW than in NW. These data provided new insight into the processes behind TW formation.
机译:张力木材(Tw)是一种专用组织,其具有由血管嵌合响应于引力刺激而形成的收缩性能。我们定量分析了杨树Chreambium的蛋白质蛋白质蛋白和其木质细胞衍生物在形成正常木(NW)和Tw的茎中,以揭示TW形成下面的机制。通过切向丧失丧失粘合并汇集到九个独立样品中来取样韧皮,嵌形和木材形成组织。在韧皮血管和晶圆样品中,TW和NW样品的蛋白质蛋白蛋白质类似,但在木膜发育期间发散,表明重新编程是TW形成的一部分。例如,发现14-3-3,反应性氧物质,核糖体和ATP酶复合蛋白在TW形成期间在木质分化的早期阶段上调。在Xylem分化的后期阶段,参与纤维素和酶的生物合成的蛋白质在rhamnogalactulan-i,rhamnogalactulan-II,阿拉伯酰亚胺酰亚胺-II和筋膜样阿拉伯半乳酰蛋白中的蛋白质在tw中上调。令人惊讶的是,即使已知木聚糖和木质素在TW在TW中,也调节两种具有推定的木聚糖Xylosyl转移酶功能和几种木质素生物合成蛋白的二甲醛蛋白的异常蛋白。这些数据提供了新的洞察TW形成后的进程。

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