IN VITRO SELECTION OF RAPE VARIANTS RESISTANT TO OXALIC ACID USING HAPLOID STEM APEXES SELECTION OF BROCCOLI VARIANTS TOLERANT TO HIGHER TEMPERATURE USING HAPLOID STEM APEXES in vitro Induction and in vitro Selection of Variants with Salt tolerance from Brassica. chinensis ESTABLISHMENT OF OPTIMAL REGENERATION SYSTEM in vitro FOR STEM APEXES OF Polygonum cuspidatum