Advance in rhizosphere biology of allelopathic plant.

The rhizosphere is a densely populated area in which plant roots must compete with the invading root systems of neighboring plant species for space, water, and mineral nutrients, and with soil-borne microorganisms, including bacteria, fungi, and insects feeding on an abundant source of organic material. Rhizosphere interactions are based on complex exchanges that occurs around the plant roots and are highly influenced by the soil factors. However, the below ground biological interactions driven by root exudates are more complex than those occurring above the soil surface. Increasing evidence suggests that root exudates act as the information transmitter in the interactions between plants and their environment and thus play an active role in root-root and root-microbe communication. In this paper, the previous studies were briefly reviewed and discussed for the further research work on plant allelopathy.