Photochemical reflectance index and its relation to photosynthetic characteristics under dynamic light environment.

ABSTRACT: The photochemical reflectance index (PRI) is a normalized reflectance index that is expected to be useful for estimating photosynthetic activity based on remote-sensing images. Experimental and theoretical studies have examined how the PRI is related to photosynthesis, but they have been based on observations under steady-state light conditions. Photosynthetic systems display differential temporal responsiveness when exposed to variation in light intensity. Here, we examined the responses of the CO2 assimilation rate (A), quantum yield of PSII photochemistry (ФP), nonphotochemical quenching (NPQ), and the PRI in two poplar species, one being a hybrid that does not close stomata in the dark (nonclosing type). When dark-adapted leaves were exposed to strong light (induction phase), the respo

SUBMITTER: Zhang JQ 

PROVIDER: S-EPMC12661318 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature