The primary growth enhances the length of the plant and the growth takes place through the mitotic division of the cells situated at the types of the roots and the shoots. The elongation of the shoots takes place through a mechanism called phototropism, which is the elongation of the stem towards the availability of sunlight. A proper amount of sunlight is required for maintaining the rate of photosynthesis. The mitotic division is directed toward the light source. The availability of enough sunlight will favor the production of an abundant amount of carbohydrates through photosynthesis and the carbohydrates serve the metabolic energy required for the further growth of the plant through powering various metabolisms. The growth of the root takes place through hydrotropism. The hydrotropism takes place as the roots grow towards the availability of water molecules. The water is required for photosynthesis and the hydrogen atoms for the construction of the carbohydrates are derived from the water molecules. The increased concentration of water will signal the roots. The proper availability of necessary substances will aid in primary growth.
Primary growth in Shoots:
The growth of the axial bud is ceased during the primary growth of the shoots in the dicots. This influence of the primary growth is called as the apical dominance and will favor in directing the energy expenditure for the elongation of the stems and not for the secondary growth of the stem. the meristematic tissues located in the apices of the shoots undergoes active division for the lengthening of the shoots. Apical dominance is highly observed in the coniferous trees. These trees initiate secondary growth only after a long period of primary growth. The lateral branches are generated only after the primary growth of the stems. The photosensors of the apices promote the growth of the stem toward the abundance of sunlight.
The primary growth of Roots:
The characteristic regions of the newly developed roots favor the primary growth of the roots. The regions of the roots associated with the primary growth include a zone of cellular maturation, the zone of cellular elongation, and a zone of cellular division. These regions have a characteristic role in the growth of the root of the eudicots. The root cap consists of actively dividing meristematic cells for replacing the cells that are damaged during the primary growth of the roots.
Zones of Eudicot Roots:
The zone of cellular division contains the apical meristem of the eudicot roots and it Is positioned before the root cap. The cells of these regions undergo active replication of cells through mitosis. The region of cellular division is followed by the zone of cellular elongation. This increase in the cell size is observed in the cells of this region and will favor the increase in the length of the roots. The stretching of the cells takes place in the direction of the excess concentration of water. The water availability ensures the growth and development of the plant. The zone of cellular elongation is followed by the region of cellular maturation. The completion of the cellular differentiation is observed in the elongated cells in the zone of cellular maturation. The differentiated cells are stored as ground, vascular, or dermal tissues. The maturation of the cells deposited at the zone of the cellular maturation is carried by the variation of the expression of the genes of the respective cells.
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