Lodging is the major factor that determines whether pea (Pisum sativum L.) can be mechanically harvested. The aim of this experiment was to investigate the relationship between stem mechanical parameters (diameter, stem wall thickness, stiffness [rigidity], and maximum self-weight moment [stem strength]) and lodging in pea. Three years of data on stem mechanical parameters and 2 yr of data on lodging resistance were collected on the ‘Carneval’ × ‘MP1401’ pea cultivars and Wt10245 × Wt11238 lines. Mechanical parameters were measured separately for three stem sections: lower, middle, and upper. Nine quantitative trait loci (QTL) associated with stem mechanical parameters were identified in the Carneval × MP1401 genetic map. Eight QTL associated with stem mechanical parameters were identified in the Wt10245 × Wt11238 genetic map. These results confirmed QTL for lodging resistance found previously, especially in regards to located in chr5LG3 close to the A004 marker. Quantitative trait loci for stem diameter and stem strength of the upper and lower stem colocated with the Rfs marker in chr5LG3. A plant height QTL was detected close to AB141 marker, 2 cM (3.3 Mbp) from the Le gene. These results enable identification of pea genomic regions associated with agriculturally important traits and provide a foundation for further research to improve lodging resistance in pea.

中文翻译：

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两个豌豆双亲作图群体茎强度特性和倒伏性的数量性状位点

倒伏是决定豌豆（Pisum sativumL.) 可以机械收获。该实验的目的是研究豌豆茎机械参数（直径、茎壁厚度、刚度 [刚性] 和最大自重力矩 [茎强度]）与倒伏之间的关系。收集了 'Carneval' × 'MP1401' 豌豆品种和 Wt10245 × Wt11238 系的三年茎力学参数数据和两年抗倒伏性数据。分别测量三个茎段的机械参数：下部、中部和上部。在 Carneval × MP1401 遗传图谱中鉴定了 9 个与茎机械参数相关的数量性状位点 (QTL)。在 Wt10245 × Wt11238 遗传图谱中鉴定了 8 个与茎机械参数相关的 QTL。这些结果证实了先前发现的抗倒伏 QTL，特别是关于位于靠近 A004 标记的 chr5LG3。上、下茎茎直径和茎强度的数量性状位点与chr5LG3 中的 Rfs标记。在 AB141 标记附近检测到植物高度 QTL，距Le基因2 cM (3.3 Mbp) 。这些结果使鉴定与农业重要性状相关的豌豆基因组区域成为可能，并为进一步研究以提高豌豆抗倒伏性提供基础。