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HANDLINGOFHAPLOIDPLANTLETSFor species undergoing direct androgenesis, small plantlets can usually be seen emerging from theanthers 4 to 8 weeks after culture (Figure 17.2). When these get large enough to handle, they shouldbe teased apart using fine-pointed forceps and then either placed on a rooting medium (usually lowsalt, with a small amount of auxin) or transplanted directly into a small pot filled with soillesspotting mixture. The callus produced in species that undergo indirect androgenesis must be removedfrom the anther and placed onto a regeneration medium containing the appropriate ratio of cytokininto auxin.To produce dihaploid plants, it is necessary to double the chromosome number of the haploids,and for many species, a colchicine treatment is used. Published procedures for producing polyploidsfrom diploids can be modified for use with anther culture derived haploids. For example, it may
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