Abstract
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.
Highlights
Wheat (Triticum aestivum L.) contributes one-third of the world’s edible dry matter
The least significant difference (LSD) test of the recombinant inbred lines (RILs) population showed that the average values of the investigated traits were significantly different among the treatments of the hydroponic trial and the field trial in most cases (Table S2). These results indicated that the treatments and genetic background assisted in explaining the overall phenotypic variation
Compared with the CK treatment, the seedling traits of SDW and TDW significantly decreased in the low K (LK) treatment
Summary
Wheat (Triticum aestivum L.) contributes one-third of the world’s edible dry matter. It is one of the most important grain crops in the world. Potassium (K) is one of the essential macronutrients for crops, which is important for crop growth, development, and fecundity, and significant for crop yield and quality [1]. It can increase the salt, drought, and disease tolerance of plants [2,3,4,5,6,7,8]. Most of the K in soil is not plant-available, and K deficiency is one of the most common limiting factors for crop production [9]
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