In this study, four varieties of rice were cultivated on the same farmland under same conditions and for same duration. However, their lodging resistance was found to be obviously different from each other. Herein, three key factors that highly influenced the lodging resistance were identified. First, in terms of morphological trait, in contrast to the generally believed theory that the overall thickness of the fresh culm wall governs the strength, the thickness of the depressed region of the dried basal culm wall largely determined the mechanical properties by acting as the weak link. This depressed region represents the vulnerable part with high syneresis rate. Second, the culm and its carbon framework exhibited sufficient strength and rigidity for both support and stability of the rice stem. The constraint of high lodging resistance of rice plants is attributed to the culm flexibility. Furthermore, the results of the positron annihilation lifetime spectroscopy corroborate that the most amorphous part and the highest-fraction free volume in the culm carbon framework were found for samples that exhibited high lodging resistance. This result confirmed the significant influence of the culm flexibility on lodging resistance. Third, a higher level of nitrogen element content in the basal culm can benefit its growth and development, which may contribute to an increase in lodging resistance of rice plants.

在这项研究中，四种水稻品种在同一块农田上以相同的条件和相同的时间种植。然而，发现它们的抗倒伏性明显不同。在此，确定了三个高度影响抗倒伏性的关键因素。首先，在形态特征方面，与普遍认为的新鲜秸秆壁整体厚度决定强度的理论相反，干燥基部秸秆壁凹陷区域的厚度在很大程度上决定了力学性能，作为弱关联。该凹陷区域代表具有高脱水收缩率的脆弱部分。其次，茎和它的碳框架表现出足够的强度和刚度来支撑和稳定水稻茎。水稻植株抗倒伏性强的约束归因于茎秆的柔韧性。此外，正电子湮没寿命光谱的结果证实，对于表现出高抗倒伏性的样品，发现了茎杆碳骨架中最无定形的部分和最高分数的自由体积。这一结果证实了茎秆柔韧性对抗倒伏性的显着影响。第三，基茎中较高水平的氮元素含量​​有利于其生长发育，这可能有助于增加水稻植株的抗倒伏性。正电子湮灭寿命谱的结果证实，对于表现出高抗倒伏性的样品，发现了茎杆碳骨架中最无定形的部分和最高分数的自由体积。这一结果证实了茎秆柔韧性对抗倒伏性的显着影响。第三，基茎中较高水平的氮元素含量​​有利于其生长发育，这可能有助于增加水稻植株的抗倒伏性。正电子湮灭寿命谱的结果证实，对于表现出高抗倒伏性的样品，发现了茎杆碳骨架中最无定形的部分和最高分数的自由体积。这一结果证实了茎秆柔韧性对抗倒伏性的显着影响。第三，基茎中较高水平的氮元素含量​​有利于其生长发育，这可能有助于增加水稻植株的抗倒伏性。