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 [...]
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 physiological significances of tuber and bulb formation in plants. The formation of tubers as the stem and bulb swellings of leaf base is governed mostly by the mobilization activities resulting in the storage of carbohydrates and fats thereby degrading the polarity in such organs. Most of the induction for mobilization starts in [...]