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1. SUPPRESSOR OF MAX2 LIKE 6, 7, and 8 Interact with DDB1 BINDING WD REPEAT DOMAIN HYPERSENSITIVE TO ABA DEFICIENT 1 to Regulate the Drought Tolerance and Target SUCROSE NONFERMENTING 1 RELATED PROTEIN KINASE 2.3 to Abscisic Acid Response in Arabidopsis

Author

Yuke Lian, Chengfei Lian, Lei Wang, Zhimin Li, Guoqiang Yuan, Lijuan Xuan, Huanhuan Gao, Haijun Wu, Tao Yang, and Chongying Wang

Subjects
strigolactone, SMXL6,7,8, DWA1, drought tolerance, abscisic acid, SnRKs, Microbiology, QR1-502
Abstract

SUPPRESSOR OF MAX2-LIKE 6, 7, and 8 (SMXL6,7,8) function as repressors and transcription factors of the strigolactone (SL) signaling pathway, playing an important role in the development and stress tolerance in Arabidopsis thaliana. However, the molecular mechanism by which SMXL6,7,8 negatively regulate drought tolerance and ABA response remains largely unexplored. In the present study, the interacting protein and downstream target genes of SMXL6,7,8 were investigated. Our results showed that the substrate receptor for the CUL4-based E3 ligase DDB1-BINDING WD-REPEAT DOMAIN (DWD) HYPERSENSITIVE TO ABA DEFICIENT 1 (ABA1) (DWA1) physically interacted with SMXL6,7,8. The degradation of SMXL6,7,8 proteins were partially dependent on DWA1. Disruption of SMXL6,7,8 resulted in increased drought tolerance and could restore the drought-sensitive phenotype of the dwa1 mutant. In addition, SMXL6,7,8 could directly bind to the promoter of SUCROSE NONFERMENTING 1 (SNF1)-RELATED PROTEIN KINASE 2.3 (SnRK2.3) to repress its transcription. The mutations in SnRK2.2/2.3 significantly suppressed the hypersensitivity of smxl6/7/8 to ABA-mediated inhibition of seed germination. Conclusively, SMXL6,7,8 interact with DWA1 to negatively regulate drought tolerance and target ABA-response genes. These data provide insights into drought tolerance and ABA response in Arabidopsis via the SMXL6,7,8-mediated SL signaling pathway.

Published
2023
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2. Crosstalk between Hydrogen Sulfide and Other Signal Molecules Regulates Plant Growth and Development

Author

Lijuan Xuan, Jian Li, Xinyu Wang, and Chongying Wang

Subjects
Hydrogen sulfide, reactive oxygen species, S-sulfhydration, plant hormone, gasotransmitter, Biology (General), QH301-705.5, Chemistry, QD1-999
Abstract

Hydrogen sulfide (H2S), once recognized only as a poisonous gas, is now considered the third endogenous gaseous transmitter, along with nitric oxide (NO) and carbon monoxide (CO). Multiple lines of emerging evidence suggest that H2S plays positive roles in plant growth and development when at appropriate concentrations, including seed germination, root development, photosynthesis, stomatal movement, and organ abscission under both normal and stress conditions. H2S influences these processes by altering gene expression and enzyme activities, as well as regulating the contents of some secondary metabolites. In its regulatory roles, H2S always interacts with either plant hormones, other gasotransmitters, or ionic signals, such as abscisic acid (ABA), ethylene, auxin, CO, NO, and Ca2+. Remarkably, H2S also contributes to the post-translational modification of proteins to affect protein activities, structures, and sub-cellular localization. Here, we review the functions of H2S at different stages of plant development, focusing on the S-sulfhydration of proteins mediated by H2S and the crosstalk between H2S and other signaling molecules.

Published
2020
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4. The SUPPRESSOR of MAX2 1 (SMAX1)-Like SMXL6, SMXL7 and SMXL8 Act as Negative Regulators in Response to Drought Stress in Arabidopsis

Author

Chongying Wang, Yuke Lian, Lijuan Xuan, Jihong Kang, Jianming Deng, Zhiyuan Bian, Zhensheng Gao, Tao Yang, and Xinyu Wang

Subjects
0106 biological sciences, 0301 basic medicine, Physiology, Drought tolerance, Mutant, Arabidopsis, Plant Science, Biology, 01 natural sciences, Transcriptome, Lactones, 03 medical and health sciences, Plant Growth Regulators, Gene Expression Regulation, Plant, Dehydration, Arabidopsis Proteins, Gene Expression Profiling, fungi, Intracellular Signaling Peptides and Proteins, Wild type, food and beverages, Cell Biology, General Medicine, biology.organism_classification, Cell biology, 030104 developmental biology, Germination, Plant Stomata, Shoot, Signal transduction, Heterocyclic Compounds, 3-Ring, Abscisic Acid, 010606 plant biology & botany
Abstract

Drought represents a major threat to crop growth and yields. Strigolactones (SLs) contribute to regulating shoot branching by targeting the SUPPRESSOR OF MORE AXILLARY GROWTH2 (MAX2)-LIKE6 (SMXL6), SMXL7 and SMXL8 for degradation in a MAX2-dependent manner in Arabidopsis. Although SLs are implicated in plant drought response, the functions of the SMXL6, 7 and 8 in the SL-regulated plant response to drought stress have remained unclear. Here, we performed transcriptomic, physiological and biochemical analyses of smxl6, 7, 8 and max2 plants to understand the basis for SMXL6/7/8-regulated drought response. We found that three D53 (DWARF53)-Like SMXL members, SMXL6, 7 and 8, are involved in drought response as the smxl6smxl7smxl8 triple mutants showed markedly enhanced drought tolerance compared to wild type (WT). The smxl6smxl7smxl8 plants exhibited decreased leaf stomatal index, cuticular permeability and water loss, and increased anthocyanin biosynthesis during dehydration. Moreover, smxl6smxl7smxl8 were hypersensitive to ABA-induced stomatal closure and ABA responsiveness during and after germination. In addition, RNA-sequencing analysis of the leaves of the D53-like smxl mutants, SL-response max2 mutant and WT plants under normal and dehydration conditions revealed an SMXL6/7/8-mediated network controlling plant adaptation to drought stress via many stress- and/or ABA-responsive and SL-related genes. These data further provide evidence for crosstalk between ABA- and SL-dependent signaling pathways in regulating plant responses to drought. Our results demonstrate that SMXL6, 7 and 8 are vital components of SL signaling and are negatively involved in drought responses, suggesting that genetic manipulation of SMXL6/7/8-dependent SL signaling may provide novel ways to improve drought resistance.

Published
2020

5. Professional Identity During the COVID-19 Pandemic: A Cross-Sectional Survey of Nurses in China

Author

Yingying Li, Feifei Zhang, Jingxia Cheng, Xiaolian Jiang, Qiantao Zuo, Longling Zhu, Zhuyue Li, Yu Zhou, and Lijuan Xuan

Subjects
Adult, Male, China, media_common.quotation_subject, Pneumonia, Viral, Identity (social science), Computer-assisted web interviewing, Emergency Nursing, Critical Care Nursing, law.invention, 03 medical and health sciences, 0302 clinical medicine, Nursing, law, Critical care nursing, Surveys and Questionnaires, Medicine, Humans, 030212 general & internal medicine, Pandemics, media_common, 030504 nursing, Social Identification, business.industry, SARS-CoV-2, COVID-19, General Medicine, Intensive care unit, Cross-Sectional Studies, Feeling, Workforce, Female, Norm (social), 0305 other medical science, business, Emergency nursing
Abstract

Background Emergency and intensive care unit nurses are the main workforce fighting against COVID-19. Their professional identity may affect whether they can actively participate and be competent in care tasks during the pandemic. Objective To examine the level of and changes in professional identity of Chinese emergency and intensive care unit nurses as the COVID-19 pandemic builds. Methods A cross-sectional survey composed of the Professional Identity Scale for Nurses plus 2 open-ended questions was administered to Chinese emergency and intensive care unit nurses through an online questionnaire. Results Emergency and intensive care unit nurses had a medium level of professional identity. Participants’ total and item mean scores in 5 professional identity dimensions were higher than the professional identity norm established by Liu (P < .001). The greatest mean item score difference was in the dimension of professional identity evaluation (3.57 vs 2.88, P < .001). When asked about their feelings witnessing the COVID-19 situation and their feelings about participating in frontline work, 68.9% and 83.9%, respectively, reported positive changes in their professional identity. Conclusions The professional identity of emergency and intensive care unit nurses greatly improved during the early stages of the COVID-19 pandemic. This finding may be attributed to more public attention and recognition of nurses’ value, nurses’ professional fulfillment, and nurses’ feelings of being supported, motivated, respected, and valued.

Published
2021

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