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Regenerable, embryogenic haploid cell suspensions were initiated and established from type II pollen calluses of two selected Chinese maize genotypes (No 592 Y and 592.A2 LY). The induction frequency of friable, embryogenic callus (type II) was highly dependent on three factors: genotype, medium, cold pretreatment, and on their interactions. Repeated callus and cell selection during the culture procedure...
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