Abstract:

The distribution ratio variation of different forms of calcium in different organs(xylem, phloem, flower and fruit, shoot)of the fruiting basal branch and their relationship to total calcium were studied by sequential extraction procedure during growth and development stage (budding, flowering and fruiting period) in order to provide the basic knowledge of calcium adsorption mechanism of wild Cerasus humilis. The results showed that calcium adsorption and distribution in different tissues and organs weres closely related to the transformation of calcium forms and their distribution. With growth and development of wild C. humilis, the distribution of different forms of calcium in xylem and phloem tended to decrease, while the distribution of different forms of calcium in shoots tended to increase. The peak distribution of water soluble calcium, calcium pectate and calcium phosphate in flowers occurred at peak flowering stage, and the peak distribution of calcium pectate and water soluble calcium in fruits appeared respectively at the initial and the last stage of fruit development. A correlation analysis showed that there was a notably positive correlation between the variation of total calcium distribution ratio in fruits and flowers and the distribution of different forms of calcium in xylem and phloem, but the variation of total calcium distribution ratio in shoots was significantly negatively correlated to the distribution of different forms of calcium in xylem and phloem. It was concluded that the transformation and redistribution of different forms of calcium occurred in different tissues and organs of the fruiting basal branch, and water soluble calcium and calcium pectate were the main forms of calcium adsorption in C. humilis fruits.

Key words: Cerasus humilis, fruiting basal branch, tissues and organs, different forms of calcium, distribution