Basic study of functional improvement of mulberry organ by growth negulation.

赤霉素促进桑树早期生长，但后期桑叶的光合作用活性和干物质生长受到抑制，TIBA诱导气孔向上部叶片的分布增加，提高了光合作用活性。在桑树修剪的情况下，促进了新叶和新茎的再生，Morphactin提高了桑叶的叶绿素含量，但出现了畸形的叶片，如茎最上部的融合叶片。处理区土壤中锌含量增加，钾含量下降。油菜素内酯在生长前期促进了桑叶和茎的生长。同时也诱导了桑叶锌含量的增加和钾含量的下降，使用时应注意避免缺钾和过量锌对桑树叶片造成伤害。

GA promoted early growth of mulberry, but in the later stage, photosynthetic activity of mulberry leaves and dry matter growth was depressed.TIBA induced higher destribution of stomata to upper leaves and inhanced photosynthetic activity. In the case of prunned mulberry, regrowth of new leaves and stems were promoted.Morphactin inhanced the chlorophyll content of mulberry leaves, but malformed leaves such as fused ones at the uppermost region of stem appear ed. In the treated plot, inhancement of Zn content and fall of K content were induced. Brassinolide promoted growth of mulberry leaves and stems in the earlier growth period. It induced inhancement of Zn content and fall of K content of mulberry leaves, too.It is necessary to be careful for the use of morphactin and brassinolide not to induce damage by K deficit and Zn excess.