The matured female pupas of Helicovrpa armigera were mutagenized with()~(60)Co γ-rays,a body color mutant was discovered in the hybrid progenies,and the color of the mutant was dark brown.

Flower color mutant was induced by 8Gy irradiation.

By hybridization of wild strain(♀) and mutagenic redbrown strain(♂) of Porphyra haitanensis,three pigment mutants,which were brown yellow pigment mutant,mosaic of breen and wild-type color and mosaic of emerald and wild-type color,were selected from a great many of cross bred blades.

Combining with its theoretical importance,this paper emphasizes the progress in the induction and selection of pigment mutants,genetic characteristics,molecular mechanism of mutatio.

A series of Gracilaria lemaneiformis from different habitates and different pigment mutants were employed in the present studies.

Induction and isolation of artificial pigmentation mutants in Porphyra haitanensis Chang et Zheng (Bangiales, Rhodophyta);

Cross experiments between the artificial pigmentation mutants and the wild type in Porphyra haitanensis Chang et Zheng, were carried out to examine the occurrence of meiosis in its life history, according to the appearance of color segregation and color-sectored blades in the F_1 gametophytic blades developed from the conchospors of the heterozygous conchocelis.