The Establishments and Benefits of the Gene Pools for the Germ Plasm Resources of Camellia Studies on the Development of Scab Resistant Gene Pool in Wheat Studies on the Development of Scab Resistant Gene Pool in Wheat Ⅰ.Analysis of the Scab Resistance and Plant Height in Different Recurrent Selection Populations Gene system ecology and its application STUDY ON COLLECTION, PRESERVATION AND GENETIC VALUATION OF GENETIC RESOURCES OF POPULUS DELTOIDES BARTR. Mechanism on the volunteer weeds of herbicide- resistant genetically-modified plants