VPD modifies CO2 fertilization effect on tomato plants via abscisic acid and jasmonic acid signaling pathways

• DOI: 10.1016/j.hpj.2023.07.005
• Publication Date: 2023-11-17T21:22:14Z
• Authors: Dalong Zhang; Huihua Yang; Xiaolu Chen; Yan Li; Yunzhou Li; Hongye Liu; Xulin Wu; Min Wei
• Keywords: Jasmonic acid; Stomatal Conductance; Turgor pressure

Atmospheric CO2 concentration is elevated globally, which has "CO2 fertilization effects" and potentially improves plant photosynthesis, yield, productivity. Despite the beneficial effect of being modulated by vapor pressure deficit (VPD), underlying mechanism highly uncertain. In present study, potential roles hormones in determining effects under contrasting high low VPD conditions were investigated integrated physiological transcriptomic analyses. Beneficial offset constrained water stress photosynthetic utilization. High induced a large passive driving force, disrupted balance consequently caused deficit. Leaf potential, turgor pressure, hydraulic conductance declined stress. The evidence combined with analyses demonstrated that abscisic acid (ABA) jasmonic (JA) acted as drought-signaling molecules response to Increased foliar ABA JA content triggered stomatal closure prevent excessive loss stress, simultaneously increased diffusion resistance for uptake from atmosphere leaf intercellular space. also significantly mesophyll transport cavity fixation site inside chloroplast. chloroplast "sink" availability was despite atmospheric "source" elevated. Thus, ABA- JA-mediated drought-resistant mechanisms modified on growth, yield This study provides valuable information improving utilization efficiency better understanding processes.