Study On Temporal-spatial Distribution And Transport Of Ferrite Within Kuerle Fragrant Pear

Kuerle Fragrant pear is a fruit tree resource in Xinjiang characteristics, but because of the southern calcareous soil alkaline large, calcareous soil is serious. In this condition, iron chlorosis often induced. This problem leads to fruit decay, lower yields, fruit quality deterioration.Iron absorption and transport in the body of tree. The correct diagnosis and treatment of physiological research is helpful to the iron chlorosis. This study focuses on the temporal and spatial distribution and transport of iron in the pear. Study of physiological index of iron chlorosis and normal tree in different organs were determined and iron in pear rootstock pear absorption and transport of various organs of iron content. Try to find out that iron in body of pear tree transportation mode and operation mechanism to provide scientific basis for diagnosis and treatment. The results are as follows:1.Pear root, trunk, branches, annual branches, petiole, leaves in different parts of water content and ash rate are not the same. The roots of the lowest moisture content, the highest petiole, Each part of the moisture content and ash rate are also slightly difference chlorosis and normal tree. Iron chlorosis tree slightly higher than normal moisture content. With the seasonal changes, moisture regularly also changing, mainly characterized by high-low-high-low law changes. In the determination of iron content, study on the moisture content and ash rate can be more accurate in the calculation of iron content value.2.The chlorophyll content of the seasonal dynamics of chlorophyll content is a single peak curve of iron chlorosis and normal tree. Overall, leaf of normal tree chlorophyll content was significantly higher than that iron chlorosis. Normal leaf chlorophyll(a+b) content is about two times of the yellow leaf(a+b) content, Chlorophyll(a/b) ratio is basically the same trend of iron chlorosis and normal tree, Show the Shuangfeng curve.3.The result showed that the apoplastic pH ranged from 5.00 to 6.00. The apoplastic pH of a normal tree was slightly higher than that of a chlorotic tree(5.61%). It was not relevant to inactivation of iron in xylem sap. The total Fe concentrations in same parts were not markedly different between normal and chlorotic trees. Therefore, the active Fe concentrations in six sampling parts of a normal tree were most significantly higher than those of chlorotic trees.The difference remained in the whole growing period.4.The speed that iron element in trunk xylem moves to crown is faster than that to root. With the extend of transfer distance, the dilutive effect of iron element concentration expresses more distinct, and so does the root injection. Phenanthroline-iron is the better tracer material of tree body iron fertilizer, which can clearly show the transport dynamic of iron element in tree body. Measuring concentration of iron element indicates that the trunk drip has better effect. As the upward velocity of iron fertilizer is faster than that of the downward velocity in the trunk, it is suggest that selecting the method of trunk drip to correct iron deficiency chlorosis of bergamot pear. Dripping iron fertilizer in the xylem can occurs inactivation phenomenon of iron element.