State Key Laboratory of Crop Biology/National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shandong Agricultural University, Tai'an 271018, China.
Genes (Basel). 2019 Aug 12;10(8):607. doi: 10.3390/genes10080607.
Potassium (K) is one of the most important mineral nutrients for wheat. In this study, the effects of low K (LK) treatments and the quantitative trait loci (QTLs) for K, calcium (Ca), and magnesium (Mg) use efficiency traits, both at the seedling and maturity stages of wheat, were investigated. The set of "Tainong 18 × Linmai 6" recombinant inbred lines (RILs) were used to identify the QTLs under different K treatments using hydroponic culture and field trials. The majority of K concentrations and content-related traits at seedling and maturity stages decreased with reduced K supply, but the K use efficiency-related traits increased. In contrast, with reduced K supply, the contents of Ca and Mg increased, while the Ca and Mg use efficiency decreased. A total of 217 QTLs for seedling traits and 89 QTLs for adult traits were detected. Four relatively high-frequency QTLs (RHF-QTLs) and 18 QTL clusters (colocation of QTLs for more than two traits) were detected. Eight clusters were detected for K-, Ca-, and Mg-related traits simultaneously. This means that these traits might be controlled by the same QTL. In addition, we highlight that 4B might be an important chromosome regulating the nutrition of K, Ca, and Mg in wheat. The 4B chromosome and four hot QTL clusters, which located 45 QTLs, might be important potential targets for further investigation.
钾（K）是小麦最重要的矿物质营养元素之一。本研究调查了低 K（LK）处理以及小麦幼苗期和成熟期 K、钙（Ca）和镁（Mg）利用效率性状的数量性状位点（QTLs）的效应。使用水培培养和田间试验，利用“台农 18×临麦 6”重组自交系（RILs）群体来鉴定不同 K 处理下的 QTLs。在 K 供应减少的情况下，幼苗期和成熟期的大多数 K 浓度和含量相关性状下降，但 K 利用效率相关性状增加。相反，随着 K 供应的减少，Ca 和 Mg 的含量增加，而 Ca 和 Mg 的利用效率下降。共检测到 217 个幼苗性状 QTL 和 89 个成株期性状 QTL。检测到 4 个相对高频 QTL（RHF-QTL）和 18 个 QTL 簇（两个以上性状的 QTL 共定位）。同时检测到 8 个与 K、Ca 和 Mg 相关性状的簇。这意味着这些性状可能受同一 QTL 控制。此外，我们强调 4B 可能是调节小麦 K、Ca 和 Mg 营养的重要染色体。4B 染色体和四个热点 QTL 簇（包含 45 个 QTL）可能是进一步研究的重要潜在目标。
