Germination and seed development
Upon favorable conditions with adequate water, temperature, and light source, the seeds begin to differentiate and develop from the embryo to germinate. Trees in temperate zones of 4 degree Celsius find this as their suitable climate for germination. However, other plants need conditions appropriate to their habits and habitats. During the germination of seeds, the embryo undergoes a sequence of patterns one after the other. In some plants, roots remain inside the embryo; upon germination, they push out of the coat of the seed and touch the soil. The cotyledons emerge after this and elongate vertically and horizontally. Photosynthesis begins after all these events occur.
Development of apical meristem â€“ The intermediate
After the embryo completely develops and all the seed components emerge fully, the growth of the meristem begins. Meristem consists of a few cells inside them, which are embryonic in origin. These cells rapidly divide and form the apical meristem, which is required for the growth of the shoot system and its components, such as leaves. Even if the shoots develop, there are always a few immature meristematic cells present in the tip. This step acts as an intermediate step between the primary and the secondary development of a plant.
Apart from the formation of the shoot system, the apical meristem is involved in cell proliferation, differentiation, and the formation of new organs and tissue systems. Initially, the embryo gives rise to pre-embryonic structures like protoderm and procambium, which are units of vascular tissues. The growth of these vascular systems begins from the apical meristem.
Secondary growth of plants:
The name radial growth is often replaced by secondary growth, wherein after attaining a certain size, plants start producing wood to transport water and nutrients. Radial assembly is a peculiar feature of dicotyledons. Most monocotyledon plants lack secondary growth. The lateral meristem brings out the secondary growth of plants. Vascular cambium and cork cambium are two types of tissues involved in secondary growth.
In the initial stage, a layer of meristematic plant tissues is stuck between the vascular tissues of the xylem and phloem. This appears disrupted and in patches. When this plant matures, these patches develop and segregate the vascular tissues. This tissue is known as vascular cambium.
The vascular cambium produces a cambial ring that initiates the multiplication of new cells that grow into secondary xylem and secondary phloem. Two varieties of wood are formed based on the activity of the cambium. These are earlywood and latewood.
Cork cambium is the surface level lateral meristem in woody plants that develops in the region of the cortex. As mentioned earlier, the growth of the ring crushes the outer layers of cortex cells. This is when the cork cambium matures into a naive protective layer. The cork cambium begins to multiply and segregate special cells and forms the outer cork, called phellem, and inner cortex, called phelloderm. Altogether, they form the tree bark.
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