Studies On Tamarix Chinensis Lour. Germplasm Collection And Utilization Technology

Tamarix chinensis Lour, is widely distributed in China. It has thin and reddish twigs, numerous and scale-like leaves, pink to whitish flowers. Especially it can tolerate drought and wet environment, also can grow in very alkaline and saline soils and maritime exposure. It will have a bright future in the landscape using. The distribution of Tamarix chinensis was investigated clearly in this paper. And on this basis, the collection of provenances, propagation technology, seedling primary selection, cuttings rooting anatomical observation were studied. At the same time, growing phenology of the provenance from Tianjin Tanggu in Nanjing was observed. The growth rhythm of one-year cutting seedlings, cultivation types and application future were studied too. The main results are as follows:Tamarix chinensis are mainly distributing in China and America. They fasten on the belt-area from north China to northwest of China, mostly grow along the Yellow river drainage basin, stream banks and sandy floodplains, also were cultivated in many provinces in south of China. In America, they are common in about 14 states in the west, and pervasive to other states in present. Germ-materials of 10 provenances were collected from Shandong, Shanxi, Jinagsu, Ningxia, Guizhou, Tianjin and so on. As well as a primary resource pool was built in Jurong city in Jiangsu province. The steps of central germplasm of Tamarix chinensis were set down in this paper too.In cutting experiments, there were no obvious relations between ecological factors of different provenances and cuttings rooting ability. But the thickness of cuttings, treatment time by auxin and auxin's concentration had evident effect on rooting. There were no differences between cutting in materials pool and in field, but generally speaking, the later had more advantages. Two years old twigs could be used to cut in spring, summer and autumn, the rooting ratio could reach to 95 percent. If the cutting pool was covered by plastic films, annual twigs could be used as cutting in winter too. After one-year growth, three priority provenances just as Lianyungang in Jiangsu province, Dongying in Shandong province, Tianjin Tanggu and 17 superior seedlings which have excellent traits were selected.The anatomical observation on the cuttings was carried out and the formation of root primordium belonged to induced types. Development of the adventitious root could be divided into following four stages: (1) proliferation of parenchyma cells in bud gap and formation of...