**5.2.2 The lateral roots of soybean scion**

The newly-grown lateral roots of soybean scion may absorb access water and nutrient from the soil, which will weaken the stress, caused by distant grafting and be not conducive to the induction of mutation. As we noticed, the presence or absence of the lateral roots of scions after grafting is related to whether the mutants occur or not and which generation the mutants occur. When removing the lateral roots of scion in time, the mutated traits can be observed on the grafting generation (G0). When retaining a lateral root of scion, the emergence of mutated traits may be postponed to the G1 to G3 generation. When retaining two or more lateral roots of scion, the grafted progeny may not have any mutants.
