69. 细胞分裂素
• 促进细胞分裂,也能使细胞
体积加大。
• 但和生长素不同的是,它使
细胞体积扩大而不是伸长。
• 茎的伸长受细胞分裂素抑制,
而一般都向横轴方向扩大增
粗。 Compared to a normal plant (left), thale cress
plants lacking the capacity to produce the
cytokinin tZ (right) exhibit poor shoot growth
and smaller rings of leaves.
75. 贮藏营养
• 阻止营养物质向外
流动
• 使营养物质向它贮
藏的部位运输
激动素表面活性剂
Cytokinin-treated leaves become "sinks" for
nutrients such as amino acids. Here you can see
in seedling B that the cytokinin-treated leaf on
the left attracted the radio-tagged amino acid
from the untreated leaf on the right. In seedling
C, when the tagged leaf is also treated with
cytokinin, there is not even the small amount of
leakage to the other leaf observed in the control
(seedling A).