Effects Of Physiological And Biochemical Properties On The Fruit Cracking Of Zizyphus Jujuba Mill. By Spraying The Different Calcium Preparation

Calcium was important during the fruit cracking, and it would provide theoretical and technical support to reduce effectively jujube cracking, which was the study of effect of calcium on fruit metabolites. Ziziphus jujuba Mill, was as the material in the paper, in order to demonstrate a regulatory role of calcium for the fruit cracking development, several compounds including the organic calcium of Gaizhongbao, the inorganic calcium of CaCl2 and the calcium-specific chelating agent of EDTA had been used. The results showed that:(1)After spraying the organic Gaizhongbao and inorganic CaC12, fruit cracking rate was lower than the control, single fruit weight is higher than the control; but after spraying the calcium-specific chelating agent of EDTA, fruit cracking rate was higher than the control, single fruit weight is higher than the control. At the same time, the effect of organic Gaizhongbao was greater than the effect of inorganic CaCl2 on fruit cracking rate and fruit weight. After spraying 2000 times organic Gaizhongbao, fruit cracking rate was lowest and single fruit weight was biggest; and after spraying 100 times inorganic CaCl2, fruit cracking rate was lowest, fruit weight was biggest by spraying 300 times inorganic CaCl2.(2)3 kinds of calcium treatment has affected the stomata number, stomatal number increased after spraying the calcium-specific chelating agent of EDTA, while the number of stomata was reduced after spraying the calcium preparation, and the stomatal number was lower of organic Gaizhongbao treatment than the inorganic CaCl2 trertment. At the same time, the stomatal number of 1500 times treatment was lowest for the organic Gaizhongbao treatment, the stomatal number of 100 times treatment was lowest for the inorganic CaCl2 trertment.(3)The pulp’s calcium content was higher than the peel’s calcium content in the green fruit stage (July 13th), then the calcium content in pulp and peel decreased gradually, until the bearing ripe period (September 10th) the peel’s calcium content was higher than the pulp’s calcium content. The calcium content in the pulp and peel increased after spraying the calcium preparation, while the calcium content in the pulp and peel decreased after spraying the calcium-specific chelating agent of EDTA. The calcium content in the pulp and peel of 1500 times treatment was highest for the organic Gaizhongbao treatment, while the differences of calcium content in the pulp and peel ware little after spraying the inorganic CaCl2.(4)The soluble sugar and soluble protein content decreased after spraying the calcium-specific chelating agent of EDTA, while both of them increased after spraying the calcium preparation. However, the content of soluble sugar was higher of organic Gaizhongbao treatment than the inorganic CaCl2 treatment, and the differences of soluble protein content ware little between organic Gaizhongbao treatment and inorganic CaCl2 treatment. Either the organic Gaizhongbao treatment or the inorganic calcium CaCl2 treatment, the influences of soluble sugar and soluble protein content were not consistent.(5)The activities of three protective enzymes are affected after spraying the 3 kinds of calcium preparation, but the influence was not consistent. The SOD activity had little differences after spraying the different concentrations of organic Gaizhongbao, while it had bigger differences after spraying the different concentrations of inorganic CaCl2; the activity of CAT was more bigger after spraying the 2000 times organic Gaizhongbao,100 times inorganic CaCl2 and the calcium-specific chelating agent of EDTA; the POD activity was biggest after spraying the 2000 times organic Gaizhongbao, while other treaments had not demonstate regularity.(6) The Ca2+-ATPase activity decreased after spraying the calcium-specific chelating agent of EDTA, while the Ca2+-ATPase activity decreased after spraying the calcium preparation. It was higher of organic Gaizhongbao treatment than the inorganic CaCl2 treatment. At the same time, the Ca2+-ATPase activity of 1500 times treatment was highest for the organic Gaizhongbao treatment, the Ca2+-ATPase activity of 300 times treatment was highest for the inorganic CaCl2 trertment.