梨果实大小,主要由果实的细胞数和细胞大小来决定。果肉的细胞分裂在发育初期即开花后四周开始进行。以后只是细胞的体积增大。梨果实的表皮细胞分裂持续到7月。秋季摘叶树与不摘叶相比,细胞大小没有差异而细胞数减少;春季摘叶树细胞数没有差异但细胞显著小。细胞的大小主要由当年5月上中旬的营养状态所支配。梨种子数在六粒以下的为小果,无种子的部分果肉细胞层数减少、细胞小。种子中的IAA、GA_3、GA_4、GA_7和ABA的含量与果实的发育有密切关系。授粉时,花粉量少所形成的果实,尽管种子数相同,但果小,因此可以推断由花粉产生的激素对果实生长有某种刺激作用。水分不足对果实发育极为敏感。从叶和果实的渗透压看,6月下旬至7月下旬果与叶最易发生水分 Pear fruit size, mainly by the number of fruit cells and cell size to decide. Fission of the flesh cell begins early in development, ie, four weeks after anthesis. After just the cell size increases. Epidermal cell division of pear fruit persists until July. There was no difference in cell size but fewer cells in the pick-tree in autumn than in the leaves without pick-off. In spring, there was no difference in the number of cells in the pick-off tree but the cells were significantly smaller. The size of the cell is dominated by the nutritional status of the middle of May in that year. Pear seeds in six or less for the small fruit, seedless part of the pulp cells reduce the number of cells. The content of IAA, GA_3, GA_4, GA_7 and ABA in seeds is closely related to the fruit development. Pollination, pollen less fruit formed, despite the same number of seeds, but small fruit, it can be concluded that the hormones produced by pollen on the fruit growth has some stimulating effect. Insufficient moisture is extremely sensitive to fruit development. From the perspective of the osmotic pressure of the leaves and fruits, fruits and leaves are most susceptible to moisture in late June to late July