Tuesday, July 28, 2009


A. External factors.
1. Water and Mineral Þ effect on root growth of 2 canopies. Differentiation of one or more nutrients will inhibit or cause abnormal growth.
2. Humidity.
3. Þ temperature affects the work of enzymes. The ideal temperature required for growth was best optimum temperature, which is different for each type of plant.
4. Þ of light affects photosynthesis. In general, an inhibiting factor.
Etiolasi is a very rapid growth in the dark
Fotoperiodisme is the response of plants to light intensity and length of radiation.

B. Dalam1 factors. Heredity factors.
2. Hormon.
a. Auksin
is indol acetic acid (IAA) is produced at the end of the apical meristem (tip of the roots and stems). F.W. Went (1928) first discovered at the end auksin wheat sprouts koleoptil Avena sativa.
- Helps germination
- Apical dominance
b. Giberelin
These compounds produced by the fungus Fusarium Giberella fujikuroi or moniliformae, discovered by F. Kurusawa.
Giberelin Function:
- The elongation of plant
- Role in Parthenocarpy
c. Cytokines
First discovered in tobacco. This hormone stimulates cell division.
d. Ethylene gas
Many found the old fruit
e. Acid absiat
f. Florigen
g. Kalin
Growth hormone organ, consisting of:
- Rhizokalin
- Kaulokali
- Filokalin
- Antokalin
h. Traumalin acid or injury kambium
Stimulate cell division in the wound area as a mechanism to cover the wound

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