The following points highlight the seven main mechanisms of phloem transport in plants. The mechanisms are: 1. Pressure Flow 2. Diffusion 3. Cyclosis 4. Electro-Osmosis 5. Transcellular Streaming 6. Microfibrillar Model 7. Correlation of Structure and Function. Mechanism # 1. Pressure Flow: According to this hypothesis the metabolites transport is a physical phenomenon (Fig. 26-7). The bulb A has strong whereas [...]
In this article we will discuss about the translocation of organic substances in phloem. An organised transport system is essential for the efficient functioning of different organs in a multicellular plant. Nutrients were absorbed from the soil through the roots and are utilized in rest of the organs of the plant. Similarly, metabolites are synthesized in the leaves and are [...]
In this article we will discuss about the mechanism involved in releasing bud dormancy. Bud dormancy is unique to the perennials which remain dormant during the period of environmental stress. Most of the temperate trees require overwintering to release their buds from dormancy. Trees may require photoperiod to break their bud dormancy. Temperature regulates bud dormancy and environmental stimuli perceived [...]