Meristems & cambiums | Tree Biology скачать в хорошем качестве

Meristems & cambiums | Tree Biology

Meristems are areas of a plant where new embryonic cells are constantly being formed, which then undergo differentiation to gain a specific function. The apical meristem is found at the tips of shoots and roots, where it extends the height/length of a part. This extension is called primary growth. The lateral meristem is found around the edge or perimeter of the stem, where it adds on girth. The increase in thickness is called secondary growth. Cambium is used to refer to specific lateral meristems, including the vascular cambium and cork cambium. Vascular cambium produces vascular/transporting tissues, i.e. xylem to the inside and phloem to the outside. The cork cambium produces cork, a protective layer that is part of the bark. The cork cambium, the cork it makes, and a third layer collectively make up periderm. Multiple periderms may exist. Terms covered: cambium, cork cambium, differentiation, apical meristem, meristem, primary growth, secondary growth, periderm Diagrams are from Biology of Plants (7th ed) by Raven, Evert and Eichhorn.