The Growth And Development Of Plants
Jumat, 10 November 2017
3 Komentar
growth and development of plants are different with animal. In the animal, growth and development happen in all parts of the body. while in plant, growth and development happen only in certain parts.
region, that is in the tip of stem and the up of root. The meristematic région i3 aLso called growth point.
Growth in the plant can be measured quantitatively by using device, which is called auxanometer
Growth in plants is divided into two kinds, those are primary growth and secondary growth.
a. Primary Growth
Primary growth is the increment of length size in the part of plant’s stem because the presence of activity of primary menstem tissue. The primary meristem is called also apical meristem became found in the edge of stem and the edge of root. The primary growth makes stem and root higher or longer.
Based on its activity, the growth region in the tip of root and the tip of stem is separated into three growth regions, those are.
1) Cell Fision Region
In this region it happens multiplication of rells by fonnation of new cells. Besides, the cell fision regior. region that fastest to grow.
2) Cell Extension
On this regional happens the change of Cell size to be extend. The Cell extending region is located behind the Cell fision region.
Secondary growth is the increment of size or thickness of a plant body organs because of the activity of secondary meristematic tissue, that is F ellogen in stem cambium and root. The secondary growth causes the enlargement of stem diameter.
In woody dicotyledon plants, the secondary growth happens because of the presence of meristematic cells activity between xylem and phloem. The xylem is formed to internal direction and phloem is formed to external direction. But the velocity of growth (formation) between xylem and phloem are different. Growth velocity in inner part is faster than growth in external part, so it makes epidermic tissue and cortex in outer skin will be broken.
Based on the growth point of plant, there are two theories of growth point in plant, those are.
1) Histogenic Theory
Teori Histogen Histogenic theory is provided by Hanstein. The theory states, that the growth of plant organs are formed by 3 tissues former layers, those are.
a) Dermatogen, that is outer layer that forms epidermic.
b) Periblem, that is inner layer that forms cortex.
c) Pleuron, that is inner layer that forms stele.
2) Tunica Corpus Theory
Tunika Corpus theory is stated by SchmidtJhis theory states that the growth of plant body organs formed there are 2 layers of tissue former, those are.
(a) Tunica, that is outer layer that forms epidermic and cortex.
(b) Corpus, that is inner layer that forms stele.
1. Grow in Plants
Growth in plants happen in meristematic region, that is in the tip of stem and the up of root. The meristematic région i3 aLso called growth point.
Growth in plants is divided into two kinds, those are primary growth and secondary growth.
a. Primary Growth
Primary growth is the increment of length size in the part of plant’s stem because the presence of activity of primary menstem tissue. The primary meristem is called also apical meristem became found in the edge of stem and the edge of root. The primary growth makes stem and root higher or longer.
Based on its activity, the growth region in the tip of root and the tip of stem is separated into three growth regions, those are.
1) Cell Fision Region
In this region it happens multiplication of rells by fonnation of new cells. Besides, the cell fision regior. region that fastest to grow.
2) Cell Extension
On this regional happens the change of Cell size to be extend. The Cell extending region is located behind the Cell fision region.
3 Cell Different Regional
in this regional happens the development of Cell to be various particular types, beaides, the Cell difference region is Cell maturation Cell region, For example, young leaft (prikordia) is formed by meristem found in the edge of the steam. Then this young leaf wraps the edge part and form bud.
The Cell differenciation region is located on region ini which happens Organs that have different structure and function
b. Secondary Growth
In woody dicotyledon plants, the secondary growth happens because of the presence of meristematic cells activity between xylem and phloem. The xylem is formed to internal direction and phloem is formed to external direction. But the velocity of growth (formation) between xylem and phloem are different. Growth velocity in inner part is faster than growth in external part, so it makes epidermic tissue and cortex in outer skin will be broken.
Based on the growth point of plant, there are two theories of growth point in plant, those are.
1) Histogenic Theory
Teori Histogen Histogenic theory is provided by Hanstein. The theory states, that the growth of plant organs are formed by 3 tissues former layers, those are.
a) Dermatogen, that is outer layer that forms epidermic.
b) Periblem, that is inner layer that forms cortex.
c) Pleuron, that is inner layer that forms stele.
2) Tunica Corpus Theory
Tunika Corpus theory is stated by SchmidtJhis theory states that the growth of plant body organs formed there are 2 layers of tissue former, those are.
(a) Tunica, that is outer layer that forms epidermic and cortex.
(b) Corpus, that is inner layer that forms stele.
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