Investiga tion on Four Type of Torreya grandis
- Received Date: 2006-06-26
Abstract: The investigation from 2001 to 2006 showed that Xifei variety of the Torreya grandis maybe come from afew torreya trees. There were differences in the period of germination and mature, aswell as in the shape of leaf andseed. According to the investigation , four excellent typeswere found in the Dongyong City, Zhejiang Province , theywere the Thin Seed Xifei (Dongyong number 1) , the EarlierMature Thin Seed Xifei (Dongyong number 2) , theBigger Leaf Xifei and the SmallerLeaf Xifei. The RAPD test ofDNA showed itwas true. In order to distinguish theratio of varies of width for the leaf and for the seed in its different parts, the concep t of variation gradientwas introduced. They had not only different forms in leaf and seed, but also distinctions in some habit. All of the four typesof Xifei grow at a lot of areas, seedling abundantly. So they could be called varieties indeed. The method combininginvestigation and testingwas very useful, thatwould make to find a lot of excellent resources of types from the p roduct populations in the future.