The petiole is mainly used to connect the leaves and stems. If this part is disconnected, the leaves will not be connected with the main body and will die. Its upper part is connected with the leaf, and the lower part is growing on the stem. Generally, the petiole is at the base of the leaf, which is an important part.
Petioles play a very important role in the early growth of leaves. They are small green membranous flakes growing at the base and both sides of petioles. They usually grow earlier than leaves. They can protect young leaves and buds in the early growth period. Its shape is very small, but some of the leaves are large, and the corresponding petioles are also large. Its growth is more special, because for some plants, with the subsequent growth changes, it will soon fall off, and some will always accompany.
It is the most important part of the leaf. The epidermis is composed of a layer of closely arranged cells without color. It is transparent. It contains chlorophyll, which can absorb sunlight and synthesize nutrients needed for plant growth.
