Fig. 6. Strategy for selecting (A3)FL4 (rf3rf3Rf4Rf4). A3Tx398 was pollinated with (B3)FL4, backcrossed with (B3)FL4, and progeny were examined for presence of the rf4-linked codominant markers LW8 and LW9. Selected females were pollinated with (B3)FL3; the F₁s were fertile with 25% iodine-stained pollen, identifying the line as (A3)FL4.