Lodging is one of the major constraints that threaten crop productivity. Although the relationship between cell walls and straw strength has been well recognized, little relevant research has been done in wheat, particularly on the monomer composition and structural characteristics of cell wall polymers and the arrangement of vascular bundles. In this study, we systematically investigated cell wall- and straw-related traits in a range of wheat germplasm resources and culm mutants using a high-throughput platform for cell wall analysis. We found that varieties with higher breaking force exhibited higher levels of crystalline cellulose but fewer hemicellulose components than other varieties. The lignin content was not consistent with the breaking force; instead, the lignin monomer constitution might be important because a significantly higher proportion of p-hydroxyphenyl (H) and guaiacyl (G) but a lower proportion of syringyl (S) monomers of lignin was found in the higher breaking force group. The crystallinity detected by X-ray diffraction was positively correlated with breaking force, indicating that the physical/chemical properties of polysaccharides also deserve attention. In terms of anatomical characteristics, the varieties with higher breaking force had a lower number and area of smaller vascular bundles in the peripheral sclerenchyma than other varieties. These results, together with the finding of a highly significant correlation between stem breaking force and straw fresh weight, 2nd internode width, flag leaf width and SiO₂ content, should provide systematic information for breeding for lodging resistance.

中文翻译：

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小麦秸秆增强抗倒伏特性的调查

住宿是威胁作物生产率的主要限制之一。尽管细胞壁与稻草强度之间的关系已得到公认，但在小麦中很少进行相关研究，特别是关于细胞壁聚合物的单体组成和结构特征以及血管束的排列。在这项研究中，我们使用高通量平台进行细胞壁分析，系统地研究了一系列小麦种质资源和茎秆突变体中细胞壁和稻草的相关性状。我们发现具有较高断裂力的品种比其他品种表现出更高水平的结晶纤维素，但半纤维素成分更少。木质素含量与断裂力不一致；代替，对-羟基苯基（H）和愈创木脂基（G），但在较高断裂力组中发现木质素的丁香基（S）单体比例较低。X射线衍射检测到的结晶度与断裂力呈正相关，表明多糖的理化性质也值得关注。就解剖学特征而言，具有较高断裂力的品种在外围硬化中的较小血管束的数量和面积要比其他品种少。这些结果以及茎断裂力与稻草鲜重，第二节间宽度，旗叶宽度和SiO ₂含量之间高度相关的发现，应为抗倒伏育种提供系统信息。