中国银杏志第二章(国外英文资料).doc

中国银杏志第二章(国外英文资料) The second chapter is about the origin, evolution and classification of Ginkgo Ginkgo biloba belongs to Ginkgo biloba, Ginkgo biloba and Ginkgo biloba in plant taxonomy Ginkgo biloba is a modern, surviving and unique species of Ginkgo biloba, (He, Shan, an, et, al.) is the only natural plant in our country ) but in geological history, ginkgo plants once flourished A wide variety of times (jonggmans, WJ, et, Al, 1971~ 1973: 1963), Si Xingjian, on the earths surface vegetation has played an important role. The time and origin of the ancestors, origins, and timing of Ginkgo plants On the question of location and so on, there has not yet been found conclusive evidence in the academic circles According to and reached an accepted conclusion. From the point of view of plant reproductive biology The reproductive mode and embryonic development of modern ginkgo are relatively primitive, and Cycads are relatively close (Wang Fuxiong et al., 1983; Hori, t, et, al.), 1997): from the view of plant anatomy, its secondary xylem Wei for high density wood type, reproductive short branch leaves and axillary vein bifurcation, bifidobacterium, These characters have appeared in the pine and cypress class. They probably originated in the Devonian gymnosperms dating back 360 million years ago. (ProSYillnosperrfls) (crane, PR), 1985:Doyle, JA, et, Al, 1986, 1987, Florn, R, 1949; Crane, PR, 1988; Zhou. ZY, 1991). Yes, there is The ginkgo species are either alone or via ornate wood The former bare wide plants evolved. These speculations remain to be found in key fossils To verify. In recent years, studies have been carried out in molecular systematics The basis of certain organelles (chloroplasts and mitochondria) of Ginkgo biloba Because of the rAcL sequence and the rRNA sequence with the nucleic acid sugar body cycads approximate more than the same degree of Bai pine is closely related. There is a once popular hypothesis about the origin of Ginkgo seeds from seed plants, bu