Biodiversity

Biography

Biography: Chang-Hung Chou

Abstract

Rhododendron formosanum, an endemic plant in subtropical region of Taiwan, possesses diversity of natural products such as phenolic acids, flavonoids and terpenoids in leaves and other plant parts. Underneath the vegetation, there is almost lacking understory species which turns out to be an allelopathic phenomenon. We have already demonstrated the unique pattern of allelopathy which was due to the allelopathic substances released from the plant leaves. The responsible allelopathic substances are water soluble phenolic acids, namely, p-hydroxybenzoic, methyl-ferulate, syringic acid, vanillic acid, coumarin, and protocatechuic acid. On the other hand, cinnamtannin D1, a trimer of catechin, from the plant induces autophagy via the inhibition of Akt/mTOR activation of ERK1/2 non-small cell lung carcinoma cells. Additionally, ursolic acid, a triterpenoid isolated from the plant, also exhibits the apoptosis of the aforementioned cancer cell. Two related triterpenoids such as oleanolic acid and betulinic acid isolated also performed anti-pathogenic bacteria activity against Staphylococcus aureus, Bacillus cereus, Enterococcus faecalis and Listeria monocytogenes. In overall, the diversified natural products of phenolics, flavonoids and terpenoids, in deed, profound multifunctions of both allelochemical and pharmaceutical activities. These diverse functions of natural products produced from the R. formosana play an important role in sustainable agriculture and pharmaceutical application that certainly are beneficial to human-being.