QTL mapping for seedling traits in wheat grown under varying concentrations of N,P and K nutrients |
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Authors: | Ying?Guo Fan-mei?Kong Yun-feng?Xu Yan?Zhao Xue?Liang Ying-ying?Wang Diao-guo?An Email author" target="_blank">Si-shen?LiEmail author |
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Institution: | (1) State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, 271018, China;(2) Research Center of Agricultural Resources, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang, 050021, China; |
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Abstract: | Nutrient use efficiency (NuUE), comprising nutrient uptake and utilization efficiency, is regarded as one of the most important
factors for wheat yield. In the present study, six morphological, nine nutrient content and nine nutrient utilization efficiency
traits were investigated at the seedling stage using a set of recombinant inbred lines (RILs), under hydroponic culture of
12 treatments including single nutrient levels and two- and three-nutrient combinations treatments of N, P and K. For the
12 designed treatments, a total of 380 quantitative trait loci (QTLs) on 20 chromosomes for the 24 traits were detected. Of
these, 87, 149 and 144 QTLs for morphological, nutrient content and nutrient utilization efficiency traits were found, respectively.
Using the data of the average value (AV) across 12 treatments, 70 QTLs were detected for 23 traits. Most QTLs were located
in new marker regions. Twenty-six important QTL clusters were mapped on 13 chromosomes, 1A, 1B, 1D, 2B, 3A, 3B, 4A, 4B, 5D,
6A, 6B, 7A and 7B. Of these, ten clusters involved 147 QTLs (38.7%) for investigated traits, indicating that these 10 loci
were more important for the NuUE of N, P and K. We found evidence for cooperative uptake and utilization (CUU) of N, P and
K in the early growth period at both the phenotype and QTL level. The correlation coefficients (r) between nutrient content and nutrient utilization efficiency traits for N, P and K were almost all significantly positive
correlations. A total of 32 cooperative CUU loci (L1–L32) were found, which included 190 out of the 293 QTLs (64.8%) for the
nutrient uptake and utilization efficiency traits, indicating that the CUU-QTLs were common for N, P and K. The CUU-QTLs in
L3, L7, L16 and L28 were relatively stable. The CUU-QTLs may explain the CUU phenotype at the QTL level. |
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