Abstract
It reviewed the research and development on genetic resources in non-heading Chinese cabbage (Brassica campestris L. ssp.chinensis Makino var. communis Tsen et Lee) achieved during the past 50 years. Researches were carried out on the methodology and classification of horticultural crops, investigation and collection of the genetic resources and development of new cultivars. Further studies were conducted on the morphological and biological characteristics, identification and analysis of disease resistance and genetic model of main economic characteristics. On these bases, 13 new cultivars were selected and spread to 800,000 hm2.
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