The middlelayer cell won't degenerate when the tapetum disintegrates prematurely, This proves the hypothesis that the middlelayercells offer nutrients for the tapetum.
绒毡层的提前解体导致不育系花药的中层细胞不退化，为证明中层为绒毡层供给营养的假说提供了证据。
2
Mesoderm --- The middle germ layer in the early embryo; the source of cells that go on to make bones, muscles, connective tissue, heart, hematopoietic system, kidney, and other organs.
Microfoamed PP/ wood flour composites and microfoamed GF/ PP/ wood flour composites have a three-layer structure, contained a middlelayer with distributed cells and two compact outer layer.