The invention belongs to the technical field of construction of
crop research mapping populations, and particularly relates to a method for constructing a
point mutation mapping
population by a germ cold shock double-
induction method, which comprises the following steps: selecting excellent dry seeds of an accurately sequenced cotton variety, and carrying out
mutagenesis treatment twice to obtain secondary
mutagenesis M0-generation seeds; continuously
sowing seeds of M1-M3 generations of mutants, and carrying out
point mutation detection; and according to the specific condition of
point mutation detection, reasonable screening is performed to form a
mutation mapping group. The novel method for constructing the point
mutation mapping group is formed by utilizing
radiation-induced point
mutation as polymorphic sites generated by
crop genomes, and has the advantages of simplicity, high efficiency, abundant sites, simple and quick construction process, time, manpower and material
resource saving, easiness in popularization, capability of obtaining batch cotton mutants in a short time, and wide application prospect. Various single-character and multi-character mutation mapping groups are constructed, and material support is provided for scientific research.