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Ding, Yezhang; Weckwerth, Philipp R.; Poretsky, Elly; Murphy, Katherine M.; Sims, James; Saldivar, Evan; Christensen, Shawn A.; Char, Si Nian; Yang, Bing; Tong, Anh-dao; et al (, Nature Plants)null (Ed.)
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Azoulay‐Shemer, Tamar; Schulze, Sebastian; Nissan‐Roda, Dikla; Bosmans, Krystal; Shapira, Or; Weckwerth, Philipp; Zamora, Olena; Yarmolinsky, Dmitry; Trainin, Taly; Kollist, Hannes; et al (, New Phytologist)Summary Little is known about long‐distance mesophyll‐driven signals that regulate stomatal conductance. Soluble and/or vapor‐phase molecules have been proposed. In this study, the involvement of the gaseous signal ethylene in the modulation of stomatal conductance inArabidopsis thalianaby CO2/abscisic acid (ABA) was examined.We present a diffusion model which indicates that gaseous signaling molecule/s with a shorter/direct diffusion pathway to guard cells are more probable for rapid mesophyll‐dependent stomatal conductance changes. We, therefore, analyzed different Arabidopsis ethylene‐signaling and biosynthesis mutants for their ethylene production and kinetics of stomatal responses to ABA/[CO2]‐shifts.According to our research, higher [CO2] causes Arabidopsis rosettes to produce more ethylene. An ACC‐synthase octuple mutant with reduced ethylene biosynthesis exhibits dysfunctional CO2‐induced stomatal movements. Ethylene‐insensitive receptor (gain‐of‐function),etr1‐1andetr2‐1, and signaling,ein2‐5andein2‐1, mutants showed intact stomatal responses to [CO2]‐shifts, whereas loss‐of‐function ethylene receptor mutants, includingetr2‐3;ein4‐4;ers2‐3,etr1‐6;etr2‐3andetr1‐6, showed markedly accelerated stomatal responses to [CO2]‐shifts. Further investigation revealed a significantly impaired stomatal closure to ABA in the ACC‐synthase octuple mutant and accelerated stomatal responses in theetr1‐6;etr2‐3, andetr1‐6, but not in theetr2‐3;ein4‐4;ers2‐3mutants.These findings suggest essential functions of ethylene biosynthesis and signaling components in tuning/accelerating stomatal conductance responses to CO2and ABA.more » « less
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Poretsky, Elly; Dressano, Keini; Weckwerth, Philipp; Ruiz, Miguel; Char, Si Nian; Shi, Da; Abagyan, Ruben; Yang, Bing; Huffaker, Alisa (, The Plant Journal)