Multiyear CO2 elevation improves PSII efficiency in a japonica rice cultivar. Issue 1 (28th December 2021)

• Record Type: Journal Article
• Authors: Lv, Chunhua; Huang, Yao; Yang, Kai; Yang, Jingrui; Cao, Peipei; Hu, Zhenghua; Sun, Wenjuan; Yu, Lingfei
• Is Part Of: Crop science. Volume 62:Issue 1(2022)
• Page Start: 346
• Page End: 357
• Publication Date: 2021-12-28
• Subjects: Crop science -- Periodicals; Cultures -- Périodiques; Cultures de plein champ -- Périodiques; Crop science; Nutzpflanzen; Zeitschrift; Pflanzenbau; Periodicals; 633
• DOI: 10.1002/csc2.20642
• Languages: English
• ISSNs: 0011-183X

Abstract

Abstract: Responses of crop photosystem activity to the short‐term elevation of carbon dioxide concentration ([CO2 ]) have been studied extensively. However, long‐term effects of elevated [CO2 ] (e[CO2 ]) over multiple cropping generations have received little attention. Using open‐top chambers (OTCs), we set up ambient [CO2 ] (CK) and two multigeneration e[CO2 ] treatments during rice ( Oryza sativa L.) growing seasons in 2016–2019: a stepwise increase (SI) up to +160 μmol mol −1 in 2019 and a constant increase (CI) of +200 μmol mol −1 above CK over four generations. Beginning in 2017, grains harvested from the previous year in different [CO2 ] treatments were used as seeds. Seedlings derived from CK OTCs in 2018 were transplanted into both SI and CI OTCs in 2019 to simulate single‐generation abrupt elevation of [CO2 ]. We measured the diurnal changes in photosystem II (PSII) functionality of leaves in 2019. Single‐generation elevation of [CO2 ] had no effects on PSII efficiency. However, a stepwise increase of [CO2 ] over four generations significantly enhanced predawn maximum photochemical efficiency of PSII (Fv /Fm ), the efficiency that trapped exciton moves an electron beyond QA − (ψo ), and the quantum yield of electron transport (φEo ) in PSII at jointing stage. The constant increase of [CO2 ] over four generations dramatically improved predawn Fv /Fm, ψo, φEo, perform index, and reaction center at grain‐filling stage. Moreover, the multigeneration elevation of [CO2 ] weakened the depression of Fv /Fm relative to single‐generation elevation at midday. All of these results indicated that e[CO2 ] had transgenerational effects on PSII functionality. Core Ideas: Stepwise and constant increase in [CO2 ] treatments were used to investigate the effects of elevated of [CO2 ] on rice PSII. Multigeneration elevation of [CO2 ] promotes PSII function relative to single‐generation elevation. Stepwise increase in [CO2 ] shows higher benefits for improving PSII efficiency.