Identification and characterization of a natural polymorphism in FT-A2 associated with increased number of grains per spike in wheat.

In this study, the D10A polymorphism showed small effects on DTH in different genetic backgrounds, ranging from a non-significant difference in the initial Kronos x Gredho population (Table 2 ), a marginally non-significant difference of 0.8 d ( P = 0.053) in the 2021 field experiment comparing Kronos isogenic lines, and an average difference of 1.7 d in the winter wheat population (Fig. 1 A).

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The lines with the A10 allele showed highly significant increases in SNS (4.1%), GNS (6.1%), and grain yield per spike (7.7%) that were of similar magnitude to the ones observed in the 2020 Tulelake experiment (Table 3 ).

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