Growth hormone

。found the earliest plant
hormone
, chemically known as pyridine, or
IAA
. Can be synthesized. Pure products are colorless crystallization, soluble in ether, ethanol, acetone and so on. Growth is known to promote the elongation of stem growth, promote rooting, induce injury
organic
formation, promote the expansion of children into fruit, inhibit organ shedding and other physiological effects. But its most basic is to promote the elong growth of cells. The growth of different organs is sensitive to growth hormone. Generally speaking, the root is the most sensitive, the stem is relatively poor, the bud boundary between the root and the stem, the most suitable concentration of the three > stem > root. The growth hormone in plants is mainly formed in the young leaves at the tip of the stem and under the tip of the stem, as well as other living tissues, which are destroyed by photooxidation or the effects of acetic acid
oxidase
at the same time. Growth hormone can exist in the body free state, can also be combined with glucose,
amino acids
inositol, etc. to become a binding state. The former has physiological activity, the latter loses activity, but under certain conditions some
can
be transformed into a free state. Since the discovery of acetic acid, many growth regulators with similar physiological effects to pyridine, such as pyridine (
IBA
), acetic acid (
NAA
),
2
,
4-
dechlorophenic acid (
2
,
4-D
and so on. They are not as easily decomposed and inactive by the body's acetylene oxidase, the agent is long-lasting, so when using growth hormone, usually choose these growth regulators with growth hormone physiological activity. At present, it is mainly used to promote rooting, promote fruit development, dredging flowers and prevent falling fruit, and kill weeds.

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