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Stomatal movements are involved in elevated CO2‐mitigated high temperature stress in tomato
- Zhang, Huan, Pan, Caizhe, Gu, Shaohan, Ma, Qiaomei, Zhang, Yiqing, Li, Xin, Shi, Kai
- Physiologia plantarum 2019 v.165 no.3 pp. 569-583
- agroecosystems, carbon dioxide, carbon dioxide enrichment, climate, climate change, heat, heat stress, heat tolerance, hydrogen peroxide, plant growth, respiratory burst, seedlings, stomatal movement, temperature, tomatoes, water use efficiency
- Climate changes such as heat waves often affect plant growth and pose a growing threat to natural and agricultural ecosystems. Elevated atmospheric CO₂ can mitigate the negative effects of heat stress, but the underlying mechanisms remain largely unclear. We examined the interactive effects of elevated CO₂ (eCO₂) and temperature on the generation of the hydrogen peroxide (H₂O₂) and stomatal movement characteristics associated with heat tolerance in tomato seedlings grown under two CO₂ concentrations (400 and 800 µmol mol⁻¹) and two temperatures (25 and 42°C). eCO₂ ameliorated the negative effects of heat stress, which was accompanied by greater amounts of RESPIRATORY BURST OXIDASE 1 (RBOH1) transcripts, apoplastic H₂O₂ accumulation and decreased stomatal aperture. Silencing RBOH1 and SLOW-TYPE ANION CHANNEL, impeded eCO₂‐induced stomatal closure and compromised the eCO₂‐enhanced water use efficiency as well as the heat tolerance. Our findings suggest that RBOH1‐dependent H₂O₂ accumulation was involved in the eCO₂‐induced stomatal closure, which participate in maintaining balance between water retention and heat loss under eCO₂ concentrations. This phenomenon may be a contributor to eCO₂‐induced heat tolerance in tomato, which will be critical for understanding how plants respond to both future climate extremes and changes in CO₂.