Molecular Design Breeding in Crops in China Eucalyptus Tree Improvement in Southern China——Problems and Strategies Some Sustainable Strategies of Improvement and Breeding for Eucalyptus Tree Species in Southern China Variation,Genetics and Strategy on Selection Breeding of Pulp Wood of Masson Pine Inheritance of Cotton Resistance to Verticillium dahliae and Strategies to D evelop Resistant or Tolerant Cultivars A New Strategy of Rice Breeding in the 21st Century Ⅱ.Searching a New Pathway of Rice Breeding by Utilization of Double Heterosis of Wide Cross and Polyploidization The Analysis of Combining Ability and Breeding Strategy with Pb Content in Maize under different Lead pollution Levels