Effects of Elevated Surface Ozone Concentration on Photosynthetic Fluorescence Characteristics and Yield of Soybean Parents and Offspring

Global climate change presents a significant threat to food security. Analyzing the effects of elevated ozone (O3) concentration on photosynthetic fluorescence characteristics and yield addresses damage crops, which would serve With open-top chambers (OTCs) Tiefeng-29 soybeans, we investigated responses chlorophyll concentration, characteristics, net rate (Pn) components different O3 concentrations, included CK (ambient approximately 45 nL·L−1, T1 (80 ± 10) nL·L−1 T2 (120 O3. The parent soybeans (S1) were planted in current year, fumigation commenced 20 days after seedling emergence. Aeration was stopped at maturity, offspring (S2) retained harvest for further experiments. In following S1 S2 planted, began results show that leaf (chla) b (chlb) significantly decreased with longer time both parents offspring, causing light-trapping ability while suffered an earlier decrease. damaged electron transfer process by reducing original actual photochemical efficiencies PSII offspring. (ETR) decreased, difference between them not treatment. non-photochemical quenching coefficient (NPQ) showed increasing trend along but no An reduced Pn, differences Pn significant. Elevated resulted yields soybeans. Although it found exhibited higher than parents, their reduction more Therefore, soybean through damaging capacity impairing energy conversion material accumulation capacity. had relatively light efficiency resulting under all treatments.