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|1. (WO2018059120) TWO-LINE RESTORER LINE FOR POLYPLOID RICE AND BREEDING METHOD THEREFOR|
|Applicants:||WUHAN POLYPLOID BIOTECHNOLOGY CO., LTD
|Title:||TWO-LINE RESTORER LINE FOR POLYPLOID RICE AND BREEDING METHOD THEREFOR|
A two-line restorer line for polyploid rice and breeding method therefor. The method comprises: a. determining a hybrid parent of a breeding restorer line; b. breeding a restorer line of indica-japonica type, or breeding a restorer line of japonica-indica type, and performing backcrossing or composite crossing after parental hybridization; c. selecting a single strain that meets a breeding objective, performing composite crossing again, and performing a first molecular marker test; d. comparing and selecting a single strain having good traits, and performing continuous self-crossing until the strain is basically stable; e. selecting a stable strain having good traits and having a tested molecular marker; f. performing test crossing with different types of polyploid sterile lines using a preferred strain as the male parent; and g. choosing a good hybrid combination and a restorer line thereof. Good strains of restorer lines for polyploid rice are bred using a combination of a restoring ability of a photo-thermo-sensitive male sterile gene and a high fecundity of a polyploid rice of a PMeS genic strain.