Seasonal Patterns in Spectral Irradiance and Leaf UV-A Absorbance Under Forest Canopies.

ABSTRACT: Plants commonly respond to UV radiation through the accumulation of flavonoids and related phenolic compounds which potentially ameliorate UV-damage to crucial internal structures. However, the seasonal dynamics of leaf flavonoids corresponding to epidermal UV absorbance is highly variable in nature, and it remains uncertain how environmental factors combine to govern flavonoid accumulation and degradation. We studied leaf UV-A absorbance of species composing the understorey plant community throughout two growing seasons under five adjacent tree canopies in southern Finland. We compared the relationship between leaf flavonol index (I_flav-repeatedly measured with an optical leaf clip Dualex) and measured spectral irradiance, understorey and canopy phenology, air temperature and s

SUBMITTER: Hartikainen SM 

PROVIDER: S-EPMC7040076 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature