Effects of chromosome substitution on the utilization efficiency of nitrogen, phosphorus, and potassium in wheat |
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Authors: | Chengjin Guo Jincai Li Wensuo Chang Lijun Zhang Xirong Cui Shuwen Li Kai Xiao |
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Institution: | (1) Capital Health, Suite 300, 10216, 124 Street, Edmonton, AB, Canada, T5N 4A3;(2) CellFor Inc., #4 6772 Oldfield Road, Saanichton, BC, Canada, V8M 2A3;(3) British Columbia Ministry of Forests, Research Branch, Cowichan Lake Research Station, P.O. Box 335, Mesachie Lake, BC, Canada, V0R 2N0 |
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Abstract: | A complete set of chromosome substitution lines with genetic background of Chinese Spring (CS) were used to determine the
effects of each chromosome on utilization efficiencies of nitrogen, phosphorus, and potassium in wheat (Triticum aestivum L.). In each line, only one pair of chromosomes in CS genome was substituted by the corresponding one of donor Synthetic
6x. Under normal growth conditions supplied with enough inorganic nutrients, the dry mass per plant and the utilization efficiencies
of nitrogen (N), phosphorus (P), and potassium (K) in plants varied largely among CS, Synthetic 6x, and the chromosome substitution
lines (1A–7A, 1B–7B, and 1D–7D). Of these, 1A substituted by the chromosome 1A of Synthetic 6x (other lines are the same as
1A hereafter) had the highest plant dry mass and the accumulative amount of N and K, and 1B behaved to have the highest plant
accumulative P amount. 1D and 4D had the lowest accumulative P amount and plant dry mass, respectively. 4B showed the lowest
plant accumulative N and K. Thus, chromosome 1A of Synthetic 6x contains major genes endowing plant capacities of higher dry
mass, accumulative N and K, whereas chromosome 1B of Synthetic 6x carries major genes improving plant accumulative P capacities.
The lines, together with CS and the donor, could be classified into three groups including high-efficiency, mid-efficiency,
and low-efficiency based on plant dry mass. Regression analysis suggested that there are significantly positive correlations
between plant dry mass and the accumulated amount of N, P, and K. Further, there are positively significant correlations among
the plant accumulative N amount and some plant traits and physiological parameters, as well as positively significant correlations
between the accumulative amount of P and K and the photosynthetic rate (P
n). |
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