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STUDY ON THE ACTIVE PRINCIPLES OF NECTARIFEROUS POLLENS OF BRASSICA CAMPESTRIS LINN.VAR.OLEIFERA DC. Genetic Transformation of Chinese Cabbage with a Inducible Potato pin ⅡGene and the Bioassay for Pieris rapae L． Resistance Genotype Identification of Restorer of Double Dominant Genic Sterility 896AB in B.campestris L. Genetic Transformation of Chinese Cabbage with a Inducible Potato pin ⅡGene and the Bioassay for Pieris rapae L． Resistance