Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
Water limitation of plants causes stomatal closure to prevent water loss by transpiration. For this purpose, progressing soil water deficit is communicated from roots to shoots. Abscisic acid (ABA) is the key signal in stress-induced stomatal closure, but ABA as an early xylem-delivered signal is still a matter of debate. In this study, poplar plants () were exposed to water stress to investigate xylem sap sulfate and ABA, stomatal conductance, and sulfate transporter () expression. In addition, stomatal behavior and expression of ABA receptors, drought-responsive genes, transcription factors, and were studied after feeding sulfate and ABA to detached poplar leaves and epidermal peels of Arabidopsis (). The results show that increased xylem sap sulfate is achieved upon drought by reduced xylem unloading by PtaSULTR3;3a and PtaSULTR1;1, and by enhanced loading from parenchyma cells into the xylem via PtaALMT3b. Sulfate application caused stomatal closure in excised leaves and peeled epidermis. In the loss of sulfate-channel function mutant, At, sulfate-triggered stomatal closure was impaired. The QUAC1/ALMT12 anion channel heterologous expressed in oocytes was gated open by extracellular sulfate. Sulfate up-regulated the expression of , a key step of ABA synthesis, in guard cells. In conclusion, xylem-derived sulfate seems to be a chemical signal of drought that induces stomatal closure via QUAC1/ALMT12 and/or guard cell ABA synthesis.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5462012 | PMC |
| http://dx.doi.org/10.1104/pp.16.01784 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Remote monitoring of plant drought stress with the apparent heat capacity.
Sci Total Environ
September 2025
European Commission, Joint Research Centre (JRC), Ispra, Italy. Electronic address:
Drought stress has profound impacts on ecosystems and societies, particularly in the context of climate change. Traditional drought indicators, which often rely on integrated water budget anomalies at various time scales, provide valuable insights but often fail to deliver clear, real-time assessments of vegetation stress. This study introduces the Cooling Efficiency Factor Index (CEFI), a novel metric purely derived from geostationary satellite observations, to detect vegetation drought stress by analyzing daytime surface warming anomalies.
View Article and Find Full Text PDFExcessive P effects in the growth of Solanum lycopersicum related to stomatal closing mediated by ABA and ethylene.
Plant Sci
September 2025
Instituto de Ciências Naturais (ICN), Universidade Federal de Alfenas, Rua Gabriel Monteiro da Silva, 700, Centro, zip code 37130-001, Alfenas, MG, Brazil. Electronic address:
Phosphorus (P) is an essential macronutrient for plant growth and development; however, both its deficiency and excess can be harmful. Although the effects of excess P are still poorly understood, research has shown that plants exposed to excessive levels of P exhibit reductions in stomatal conductance, photosynthesis, and growth. The aim of this study was to investigate the effect of different P concentrations on stomatal responses, photochemical parameters, growth, and development of three Solanum lycopersicum genotypes: wild type, Never ripe (lower sensitivity to ethylene), and Notabilis (deficient in ABA production).
View Article and Find Full Text PDFPhosphorylation-dependent activation of MAP4K1/2 by OST1 mediates ABA-induced stomatal closure in Arabidopsis.
J Integr Plant Biol
September 2025
State Key Laboratory of Plant Environmental Resilience, Frontiers Science Center for Molecular Design Breeding, College of Biological Sciences, China Agricultural University, Beijing, 100193, China.
In higher plants, stomatal movements represent a critical physiological process that matains cellular water homestasis while enabling photosynthetic gas exchange. Open stomata 1 (OST1), a key protein kinase in the abscisic acid (ABA) signaling cascade, has been established as a central regulator of stomatal dynamics. This study reveals that two highly conserved mitogen-activated protein kinase 1 (MAP4K1) and MAP4K2 are positive regulators in ABA promoted stomatal closure, and ABA-activated OST1 potentiates MAP4K1/2 through phosphorylation at conserved serine and threonine residues (S166, T170, and S479/S488).
View Article and Find Full Text PDFCowpea Lipid Transfer Protein LTP1 Mediates Plant Resistance to .
Mol Plant Microbe Interact
September 2025
Huazhong Agricultural University, College of Life Science and Technology, Wuhan, Hubei , China;
Plant lipid transfer proteins (LTPs), belonging to pathogenesis-related protein 14 family, participate in plant immune response to biotic stress. LTP1 from was previously shown to be able to suppress infection by cowpea mosaic virus and soybean mosaic virus. However, whether cowpea LTP1 participates in the plant resistance to other plant pathogens remains unclear.
View Article and Find Full Text PDFCoordinated Regulation of Photosynthesis, Stomatal Traits, and Hormonal Dynamics in During Drought and Rehydration.
Biology (Basel)
August 2025
Experimental Center of Subtropical Forestry, Chinese Academy of Forestry, Xinyu 338000, China.
, a woody oilseed species endemic to China, often experiences growth constraints due to seasonal drought. This study investigates the coordinated regulation of photosynthetic traits, stomatal behavior, and hormone responses during drought-rehydration cycles in two cultivars with contrasting drought resistance: 'CL53' (tolerant) and 'CL40' (sensitive). Photosynthetic inhibition resulted from both stomatal and non-stomatal limitations, with cultivar-specific differences.
View Article and Find Full Text PDF