**2. Conclusion**

As a conclusion, since plants are open systems and do not exist in a vacuum, they are continuously interacted with their biotic and non-biotic surroundings. Based on the literatures cited in the present chapter, a universal mechanism with respect to the accumulation behavior of flavonoid cannot be illustrated even the flavonoids commonly exhibit a tendency toward increase in response to the unfavorable conditions. Up to our best research, flavonoid accumulation behavior varies depending on the developmental stage, species and even cultivars of the same species. It also exhibits different reaction to the different stressors.

Beyond physiological aspect for the plants for their survival mechanism, plants are also sources for other living organisms. The quality and then biological efficacy of the flavonoid containing crops are great issue for human beings. According to the literature cited herein, the fate of the flavonoids containing herbal products including bulbs, leaves, fruits etc is influenced by the storage temperatures, storage time, modified storage conditions, cultivars, different parts and subunit parts of the plant, light and maturity.
