Relationship between Photosynthetic CO₂ Assimilation and Chlorophyll Fluorescence for Winter Wheat under Water Stress.

ABSTRACT: Solar-induced chlorophyll fluorescence (SIF) has a high correlation with Gross Primary Production (GPP). However, studies focusing on the impact of drought on the SIF-GPP relationship have had mixed results at various scales, and the mechanisms controlling the dynamics between photosynthesis and fluorescence emission under water stress are not well understood. We developed a leaf-scale measurement system to perform concurrent measurements of active and passive fluorescence, and gas-exchange rates for winter wheat experiencing a one-month progressive drought. Our results confirmed that: (1) shifts in light energy allocation towards decreasing photochemistry (the quantum yields of photochemical quenching in PSII decreased from 0.42 to 0.21 under intermediate light conditions) and increasing

SUBMITTER: Jia Q 

PROVIDER: S-EPMC10574178 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature