👉 Upstem refers to a specific type of stem cell in plant cells. These stem cells are responsible for the development and growth of shoots, roots, and other parts of plants. Upstems are typically found in the lateral phloem, which is a layer of tissue that lines the xylem vessels in leaves. In general, upstem cells originate from the root tip, where they differentiate into the shoot or root system. They play an important role in plant growth and development by providing energy