Meanwhile, the inner layer palisade cells of BBC leaves were more isodiametric with large air spaces between them, suggesting reduced cell-to-cell adhesion.

• 另外，“花打顶”黄瓜展开叶片的栅栏细胞和海绵细胞叶绿体中有较大而多的淀粉粒，阻碍了光合磷酸化和电子传递，抑制了叶片的光合作用，不能提供足够的生长和发育所需之能量，可能也是叶片早期衰老的一种表现。