Phosphorus (P) is one of the most vital nutrient elements in crop output and quality formation. In this study, four biomass, four P uptake efficiency (PupE), and three P-utilization efficiency (PutE) traits were investigated using a set of recombinant inbred lines (RILs) derived from a cross of “SN0431 × LM21”, under hydroponic culture trials at low P (LP) and normal P (NP) levels in two different seasons, respectively. A total of 85 QTL were identified on 18 chromosomes except for 1D, 2A, and 3D. Among them, 36 and 42 QTL were detected under LP and NP, respectively, and seven QTL were simultaneously detected under LP and NP. Seventeen relatively high-frequency QTL (RHF-QTL) were detected. The average contributions of 13 major RHF-QTL were over 10.00%. Five important QTL clusters were detected on chromosomes 4D, 5A, and 5B. Among them, positive linkages were observed between PutE and biomass traits at four QTL clusters, C1, C2, C3, and C6, showing these loci may be hot spots for genetic control of both phosphorus utilization and biomass accumulation in wheat seedlings. In addition, correlation analysis indicated that three biomass traits (SDW, RDW, and TDW) should be used as primary selection indexes for PE at the seedling stage.

中文翻译：

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小麦苗期磷效率和生物量性状的QTL检测

磷（P）是作物产量和品质形成中最重要的营养元素之一。在这项研究中，使用一组源自“SN0431 × LM21”杂交的重组自交系（RIL），在水培条件下研究了四种生物量、四种磷吸收效率（PupE）和三种磷利用效率（PutE）性状。分别在两个不同季节在低磷 (LP) 和正常磷 (NP) 水平下进行培养试验。除1D、2A和3D外，在18条染色体上共鉴定出85个QTL。其中LP和NP分别检测到36个和42个QTL，LP和NP下同时检测到7个QTL。检测到17个相对高频QTL（RHF-QTL）。13个主要RHF-QTL的平均贡献率均超过10.00%。在染色体 4D、5A 和 5B 上检测到五个重要的 QTL 簇。他们之中，在四个 QTL 簇 C1、C2、C3 和 C6 上观察到 PutE 和生物量性状之间存在正相关，表明这些位点可能是小麦幼苗磷利用和生物量积累的遗传控制热点。此外，相关性分析表明，应将三个生物量性状（SDW、RDW 和 TDW）作为幼苗期 PE 的初级选择指标。