Lodging resistance can be improved by enhancing the mechanical strength of culms, and culm carbohydrates could improve this mechanical strength. Culm carbohydrates can regulate development of the culm and affect its toughness. The present study determines the relationship between lodging and carbohydrate content in oat culms. Field experiments were conducted in alpine regions in 2017 and 2018 using three oat varieties with different lodging resistance. Lodging-related morphological characteristics were directly determined and culm carbohydrate content and enzyme activity related to cellulose synthesis and sucrose metabolism were evaluated with ultraviolet spectrophotometry. Results showed that the lower the gravity height or the lower ratio of gravity height to plant height, the stronger the lodging resistance of the varieties. Higher culm nonstructural (NSC) and structural (SC) carbohydrate content contributed to the ability of culms to resist lodging, especially the content of cellulose and sucrose. PCA showed that sucrose metabolism and SC content were closely related to lodging resistance. Correlation analysis showed that the lodging index (LI) was significantly negatively correlated with NSC. Sucrose content was highly and significantly positively correlated with NSC. Additionally, the activities of sucrose phosphate synthase (SPS) and sucrose synthase (SS) were highly and significantly positively correlated with sucrose and cellulose content. The relationship between field characters and oat lodging, as well as the regulatory mechanism of carbohydrate content on lodging resistance of the culm are discussed.

中文翻译：

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表征燕麦茎的形态特征和碳水化合物代谢及其与抗倒伏性的关系。

可以通过增强茎秆的机械强度来改善抗倒塌性，而茎秆碳水化合物可以改善这种机械强度。茎秆碳水化合物可以调节茎秆的发育并影响其韧性。本研究确定了燕麦茎中的倒伏与碳水化合物含量之间的关系。2017年和2018年在高山地区使用三种具有不同抗倒伏性的燕麦品种进行了田间试验。直接确定与住宿有关的形态特征，并用紫外分光光度法评估与纤维素合成和蔗糖代谢有关的茎秆碳水化合物含量和酶活性。结果表明，重力高度越低或重力高度与株高的比率越低，该品种的抗倒伏性越强。茎秆非结构（NSC）和结构（SC）碳水化合物含量较高，有助于茎秆抗倒伏能力，尤其是纤维素和蔗糖的含量。PCA显示蔗糖代谢和SC含量与抗倒伏性密切相关。相关分析表明，倒伏指数（LI）与NSC呈显着负相关。蔗糖含量与NSC呈极显着正相关。另外，蔗糖磷酸合酶（SPS）和蔗糖合酶（SS）的活性与蔗糖和纤维素含量高度显着正相关。讨论了田间特性与燕麦倒伏之间的关系，以及碳水化合物含量对茎秆倒伏阻力的调节机制。