苹果大多数品种属异花授粉结实,在授粉过程中,如有半边柱头授粉不良,或因花粉管发育不良而未能受精的,便造成子房内的胚和胚乳败育式是雌蕊虽然授粉受精,子房内的胚和胚乳也已开始发育,但因多倍体、营养不足、水分失调或低温伤害等某种因素的影响,造成胚和胚乳发育受阻,以致既不能形成种子,也不会产生促进果实细胞分裂的生长素。然而,另一边 Most varieties of apple are cross-pollination strong in the pollination process, if stigma pollination of the poor side of the poor, or due to poor development of pollen tube failed to fertilize, it will cause the ovary and endosperm abortive style is pollinated pistil although Fertilization, ovarian embryo and endosperm has also begun to develop, but due to polyploidy, malnutrition, moisture imbalance or hypothermia and other factors, resulting in embryo and endosperm development blocked, so that neither the formation of seeds, nor Ghrelin, which promotes fruit cell division, is produced. However, the other side