Article
Plant Sciences
Po-Kai Hsu, Guillaume Dubeaux, Yohei Takahashi, Julian I. Schroeder
Summary: In recent years, significant progress has been made in understanding the regulatory mechanisms of ABA signal transduction, the physiological importance of basal ABA signaling in stomatal regulation, and the interactions of ABA with other stomatal signaling pathways, which provide important insights for enhancing crop drought tolerance and water-use efficiency.
Article
Multidisciplinary Sciences
Tianci Yan, Chuang Mei, Handong Song, Dongqian Shan, Yanzhao Sun, Zehui Hu, Lin Wang, Tong Zhang, Jixun Wang, Jin Kong
Summary: Dwarfing is a typical trait for mechanical strengthening and high yield in modern apple orchards. In this study, four dwarfing apple germplasms with shorter internodal distance were identified in the semi-arid area of Xinjiang, China. The high levels of melatonin (MT) in these germplasms were negatively associated with oxidative damage and malondialdehyde (MDA) levels. Among the detected hormones, only abscisic acid (ABA) and zeatin-riboside (ZR) levels were correlated with the dwarfing phenotype. The expression of melatonin and ABA synthesis-related genes, as well as ZR synthetic enzyme gene, were well correlated with the levels of MT, ABA, and ZR, respectively. The significantly higher expression of ABA marker genes and lower expression of ZR marker genes in the dwarfing germplasms were consistent with the ABA and ZR levels. Considering the long-term drought in Xinjiang, dwarfing with high MT and ABA levels may be a beneficial strategy for these germplasms to survive drought stress.
Article
Environmental Sciences
Lin Meng, Jeffrey Chambers, Charles Koven, Gilberto Pastorello, Bruno Gimenez, Kolby Jardine, Yao Tang, Nate McDowell, Robinson Negron-Juarez, Marcos Longo, Alessandro Araujo, Javier Tomasella, Clarissa Fontes, Midhun Mohan, Niro Higuchi
Summary: This study investigates the limitation of transpiration by water in humid tropical rainforests. The research finds that during the El Nino drought, transpiration was constrained by water due to a rapid decline in sap velocity and soil moisture reduction.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Zhuoyi Tu, Yuting Yang, Michael L. Roderick
Summary: State-of-the-art evaporation models often assume net radiation and surface temperature as independent driving forces for evaporation. However, there is a physical coupling between net radiation and surface temperature, which extends to evaporation. This study tests a maximum evaporation theory for saturated land surfaces, which acknowledges the interactions between radiation, surface temperature, and evaporation. The results suggest that saturated land surfaces behave similarly to ocean surfaces in terms of evaporation.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2022)
Article
Ecology
Fabian J. P. Wankmuller, Andrea Carminati
Summary: Understanding stomatal regulation is crucial for predicting vegetation-atmosphere fluxes during drought conditions. While optimization models suggest stomata close to prevent water loss, a new model based on abscisic acid levels proposes an alternative explanation for stomatal behavior.
Article
Plant Sciences
Guang-Qian Yao, Zheng-Fei Nie, Neil C. Turner, Feng-Min Li, Tian-Peng Gao, Xiang-Wen Fang, Christine Scoffoni
Summary: The study revealed that Caragana species adapted to low precipitation environments exhibit specific traits in leaf hydraulic conductance, gas exchange, and vein anatomy, with tighter stomatal control mediated by higher ABA accumulation leading to increased water use efficiency and hydraulic safety during drought stress.
Article
Biochemistry & Molecular Biology
Yudong Liu, Ling Wen, Yuan Shi, Deding Su, Wang Lu, Yulin Cheng, Zhengguo Li
Summary: The drought stress-responsive gene SlGRAS4 in tomato enhances plant tolerance to drought stress by modulating ROS homeostasis and the SnRK2-AREB signaling pathway.
Article
Plant Sciences
Hyun Jin Chun, Lack Hyeon Lim, Mi Sun Cheong, Dongwon Baek, Mi Suk Park, Hyun Min Cho, Su Hyeon Lee, Byung Jun Jin, Dong Hyeon No, Ye Jin Cha, Yong Bok Lee, Jong Chan Hong, Dae-Jin Yun, Min Chul Kim
Summary: This study demonstrates that the CCoAOMT1 gene plays a role in drought stress response in plants by regulating H2O2 accumulation and ABA signaling, suggesting its positive impact on adaptation to prolonged environmental stresses.
Article
Plant Sciences
Wanlong Yang, Na Li, Yuxin Fan, Biying Dong, Zhihua Song, Hongyan Cao, Tingting Du, Tengyue Liu, Meng Qi, Lili Niu, Dong Meng, Qing Yang, Yujie Fu
Summary: This study demonstrates that ABA can enhance drought resistance in pigeon pea by regulating the accumulation of flavonoids through secondary metabolism. ABA treatment led to significant changes in flavonoid biosynthesis pathways, with key enzyme genes being up-regulated. Transcriptome analysis revealed potential involvement of multiple transcription factors in the regulation of flavonoid accumulation, and RT-PCR confirmed their regulation by ABA. High Performance Liquid Chromatography analysis showed increased content of genistein, genistin and pterostilbene in pigeon pea treated with ABA under drought stress.
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
(2021)
Article
Plant Sciences
Athina Parasyri, Olaf Barth, Wiebke Zschiesche, Klaus Humbeck
Summary: This study identified heavy metal associated isoprenylated plant proteins (HIPPs) that play a regulatory role in drought stress, ABA signaling, and leaf senescence in plants. The results suggest that these proteins are involved in a crosstalk between stress responses and growth control pathways.
Article
Multidisciplinary Sciences
Jing Zhang, Heng Zhou, Mingjian Zhou, Zhenglin Ge, Feng Zhang, Christine H. Foyer, Xingxing Yuan, Yanjie Xie
Summary: The study revealed that in Arabidopsis, dehydration-induced expression of DES1 is regulated by ABA, and ABA-deficient mutants show abolished DES1 expression under dehydration. Complementation of ABA3 or ABA treatment can rescue DES1 expression and wilting phenotype in ABA-deficient mutants. Additionally, coordinated synthesis of ABA and DES1 is required for drought-induced stomatal closure in Arabidopsis.
JOURNAL OF ADVANCED RESEARCH
(2021)
Article
Plant Sciences
Hagai Shohat, Hadar Cheriker, Himabindu Vasuki Kilambi, Natanella Illouz Eliaz, Shula Blum, Ziva Amsellem, Danuse Tarkowska, Asaph Aharoni, Yuval Eshed, David Weiss
Summary: This study investigated the regulation of gibberellin metabolism in tomato plants in response to drought, focusing on the impact on stomatal closure and water loss. The results indicated that GA deactivation in guard cells contributes to stomatal closure in early stages of dehydration, while inhibition of GA synthesis in leaves suppresses canopy growth and reduces transpiration area.
Article
Environmental Sciences
Lijuan Wang, Ni Guo, Ping Yue, Die Hu, Sha Sha, Xiaoping Wang
Summary: This study establishes an empirical model and analyzes the spatial-temporal characteristics of ET changes with SWC to achieve remote sensing monitoring of large-scale drought based on SWC. The results reveal the complex relationship between ET and SWC under different regions and precipitation conditions.
Article
Plant Sciences
Shuang Li, Junming Liu, Hao Liu, Rangjian Qiu, Yang Gao, Aiwang Duan
Summary: The study revealed that under drought conditions, stomatal conductance (g(s)) was more sensitive than mesophyll conductance (g(m). ABA was involved in coordinating reductions of g(s) and g(m), thereby regulating net photosynthesis (A(n)) and intrinsic water use efficiency (WUEi).
FRONTIERS IN PLANT SCIENCE
(2021)
Article
Environmental Sciences
Yeonuk Kim, Monica Garcia, Mark S. S. Johnson
Summary: The extent of runoff reduction, drought intensification, and dryland expansion under climate change is not clear due to discrepancies between global circulation models and current potential evaporation (PE) models. Research suggests that current PE models may overestimate future evaporation under non-water-stressed conditions. In this study, a land-atmosphere coupled PE model is introduced to accurately reproduce non-water-stressed evaporation. The findings indicate that land-atmosphere coupling moderates continental drying trends and is crucial for improving predictions of climatic impacts on water resources.