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在谷物发育过程中,麦内中细胞壁多糖的时空沉积
Pavani P Nadiminti1, Sarah M Wilson1, Allison van de Meene2
1La Trobe Institute for Sustainable Agriculture & Food, Department of Animal, Plant and Soil Sciences, School of Agriculture, Biomedicine and Environment, La Trobe University, Bundoora, Victoria 3086, Australia.
Plant physiology
|October 20, 2023
概括
大 endosperm 发育显示 (1,3;1,4) -β-D-葡萄糖 (MLG) 沉积较晚,在 AC Morgan 和 CDC Morrison 品种之间存在差异. 在MLG生物合成中的基因表达差异与CDC Morrison中较高的MLG含量相关.
科学领域:
- 植物生物学 植物生物学
- 农业科学 农业科学
- 生物化学 生物化学
背景情况:
- 麦 (Avena sativa) 谷物是可溶性食纤维的来源,特别是 (1,3;1,4) -β-D-葡萄糖 (MLG).
- 了解麦内的发展对于改善谷物的营养价值和MLG含量至关重要.
研究的目的:
- 分析两种加拿大品种的麦内的发育,它们的MLG含量不同.
- 为了研究多糖的时空沉积,包括MLG,在麦粒的发展过程中.
- 为了将基因表达与MLG丰度和内精细胞特征相关联.
主要方法:
- 在两个麦品种 (AC摩根和CDC莫里森) 中对内的发展进行比较分析.
- 使用显微镜检测和定位多糖类 (,纤维素,异黄素,同黄素,异素,MLG).
- 用RNA测序来分析MLG生物合成基因 (CSLF,CSLH) 的基因表达.
主要成果:
- 麦内的发育遵循核型,细胞化阶段比大麦要短.
- MLG是最后沉积的多糖体 (18 DPE),发生在分化阶段.
- 在品种之间观察到MLG时空模式的显著差异,CDC莫里森显示更连续的标签.
- 在CDC Morrison中发现了较高的MLG生物合成基因 (CSLF,CSLH) 转录水平,与较高的MLG含量相关.
- 与AC摩根相比,CDC莫里森表现出较小的内细胞和更厚的壁.
结论:
- 麦内的MLG沉积是晚期发育事件,发生在细胞化后.
- 多种类的MLG含量差异与独特的时空沉积模式和生物合成途径的差异性基因表达有关.
- 内精细胞的大小和壁厚在发育早期就已经确立,可能会影响MLG的积累.
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