SOMATIC HYBRID PLANT REGENERATION BETWEEN NAVEL ORANGE AND LEMON VIA PROTOPLAST ELECTRO FUSION Intergeneric Somatic Hybrid Plants Between Citrus and Poncirus trifoliata and Evaluation of Their Root Rot Resistance Research on genetic stability to American ginseng introduced into China for 30 years Genetic relationship analysis of Zea species using RAPD markers Unexpected Ploidy Variation of the Somatic Hybrid Plants Between Citrus sinensis and Clausena lansium