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"abscisic acid"

Jorge González-Villagra, Jerry D Cohen, Marjorie M Reyes-Díaz
Abscisic acid (ABA) regulates the physiological and biochemical mechanisms required to tolerate drought stress, which is considered as an important abiotic stress. It has been postulated that ABA might be involved in regulation of plant phenolic compounds biosynthesis, especially anthocyanins that accumulate in plants subjected to drought stress; however, the evidence for this postulate remains elusive. Therefore, we studied whether ABA is involved in phenolic compounds accumulation, especially anthocyanin biosynthesis, using drought stressed Aristotelia chilensis plants, an endemic berry in Chile...
June 20, 2018: Physiologia Plantarum
Kaili Xie, Lulu Li, Hehong Zhang, Rong Wang, Xiaoxiang Tan, Yuqing He, Gaojie Hong, Junmin Li, Feng Ming, Xuefeng Yao, Fei Yan, Zongtao Sun, Jianping Chen
Abscisic acid (ABA) plays a multifaceted role in plant immunity and can either increase resistance or susceptibility to some bacterial and fungal pathogens depending on the pathosystem. ABA is also known to mediate plant defense to some viruses. In this study, the relationship between the ABA pathway and rice black-streaked dwarf virus (RBSDV) was investigated in rice. The expression of ABA pathway genes was significantly reduced upon RBSDV infection. Application of exogenous hormones and various ABA pathway mutants revealed that the ABA pathway plays a negative role in rice defense against RBSDV...
June 19, 2018: Plant, Cell & Environment
Jolanta Groszyk, Yuliya Yanushevska, Andrzej Zielezinski, Anna Nadolska-Orczyk, Wojciech M Karlowski, Waclaw Orczyk
GLYCOGEN SYNTHASE KINASE3/Shaggy-like kinases (GSKs) represent a highly conserved group of proteins found in all eukaryotes. In plants they are encoded by multigene families and integrate signaling of brassinosteroids, auxin and abscisic acid in wide range of physiological and developmental processes with a strong impact on plant responses to environmental and biotic factors. Based on comprehensively studied structures of 10 Arabidopsis thaliana GSK genes and encoded proteins we report identification and phylogenetic reconstruction of 7 transcriptionally active GSK genes in barley...
2018: PloS One
Ning Li, Song-Jie Zhang, Qi Zhao, Yue Long, Hao Guo, Hong-Fang Jia, Yong-Xia Yang, Hong-Ying Zhang, Xie-Feng Ye, Song-Tao Zhang
General control non-derepressible-2 (GCN2) is a ubiquitous protein kinase that phosphorylates the α subunit of the eukaryotic initiation factor, eIF2, preventing the initiation of a new cycle of protein synthesis, subsequently reducing the global protein biosynthesis. GCN2 can also regulate the response of plants to biotic and abiotic stresses. In this study, two GCN2 homologs, NtGCN2-1 and NtGCN2-2 , were cloned from Nicotiana tabacum , and were predicted to have been derived from their progenitors in N. tomentosiformis and N...
2018: Frontiers in Plant Science
Nannan Song, Zhilan Xu, Jing Wang, Qianqian Qin, Haiyang Jiang, Weina Si, Xiaoyu Li
The CONSTANS-LIKE (COL) gene has an important role both in regulation flowering through photoperiodic control and response to abiotic stress. In the present study, we performed a genome-wide analysis of maize COL gene family and identified 19 non-redundant ZmCOL genes, which were unequally distributed on ten maize chromosomes. Analysis of compound phylogenetic tree (maize, sorghum, rice and Arabidopsis) showed high bootstrap, as well as conserved domain and semblable gene structures among members within the same clade, revealing that COL genes in same clade were from the common ancestral and prior to the divergence of monocots and dicots lineages...
June 13, 2018: Gene
Chuanlin Zheng, Atiako Kwame Acheampong, Zhaowan Shi, Amichay Mugzech, Tamar Halaly-Basha, Felix Shaya, Yufei Sun, Violeta Colova, Assaf Mosquna, Ron Ophir, David W Galbraith, Etti Or
The molecular mechanism regulating dormancy release in grapevine buds is as yet unclear. It was formerly proposed that dormancy is maintained by ABA-mediated repression of bud-meristem activity, and that removal of this repression triggers dormancy release. It was also proposed that such removal of repression may be achieved via natural or artificial upregulation of VvA8H-CYP707A4, which encodes ABA 8'-hydroxylase, and is the most highly expressed paralog in grapevine buds. The current study further examines these assumptions, and its experiments reveal that (1) hypoxia and ethylene, stimuli of bud dormancy release, enhance expression of VvA8H-CYP707A4 within grape buds, (2) the VvA8H-CYP707A4 protein accumulates during the natural transition to the dormancy release stage, and (3) transgenic vines overexpressing VvA8H-CYP707A4 exhibit increased ABA catabolism, significant enhancement of bud-break in controlled and natural environments and longer basal summer laterals...
June 15, 2018: Plant, Cell & Environment
Zhou Li, Yaping Li, Yan Zhang, Bizhen Cheng, Yan Peng, Xinquan Zhang, Xiao Ma, Linkai Huang, Yanhong Yan
Endogenous hormones and polyamines (PAs) could interact to regulate growth and tolerance to water stress in white clover. The objective of this study was to investigate whether the alteration of endogenous indole-3-acetic acid (IAA) level affected other hormones level and PAs metabolism contributing to the regulation of tolerance to water stress in white clover. Plants were pretreated with IAA or L-2-aminooxy-3-phenylpropionic acid (L-AOPP, the inhibitor of IAA biosynthesis) for 3 days and then subjected to water-sufficient condition and water stress induced by 15% polyethylene glycol 6000 for 8 days in growth chambers...
June 9, 2018: Plant Physiology and Biochemistry: PPB
Yi Shi, Xinju Liu, Yuanyuan Fang, Qing Tian, Hanyu Jiang, Huiling Ma
Brown patch, caused by Rhizoctonia solani, is a serious disease in Agrostis stolonifera. 2, 3-butanediol (2, 3-BD) is the major component of volatile organic compounds and was found to initiate induced systemic resistance (ISR). To investigate the induced resistance mechanism of 2, 3-BD, we examined the effects of resistance by area affected, along with changes in the content of phytohormones (Zeatin (ZT), Abscisic Acid (ABA) and Indole-3-Acetic Acid (IAA)), the activities of three phenylpropanoid metabolic enzymes (Phenylalaninammo-Nialyase (PAL), Chalcone Isomerase (CHI) and 4-Coumarate:Coenzyme A Ligase (4CL)) and the level of secondary metabolites (total phenols, flavonoid and lignin)...
June 12, 2018: Plant Physiology and Biochemistry: PPB
Yuefei Li, Yong Fan, Yang Jiao, Jie Wu, Zhen Zhang, Xiaolei Yu, Ying Ma
The yellow leafy head of Brassica rapa is known to be tasty and nutritional. Therefore, the heading stage of leaf development is critical to realize high yield and economic benefits. A widely planted commercial cultivar of Brassica rapa ("Qiubao", deep yellow leafy head) was used to conduct transcriptome analysis. The results showed that the yellowing of the inner leaf was likely induced by the predominant β-carotene biosynthesis pathway due to the upregulated gene GGPP and PSY, and the downregulated gene CrtL-e, NCED4 and DWARF-27...
June 14, 2018: Physiologia Plantarum
Jianhua Xiang, Xiaoyun Zhou, Xianwen Zhang, Ailing Liu, Yanci Xiang, Mingli Yan, Yan Peng, Xinbo Chen
Potassium (K+ ) is one of the essential macronutrients required for plant growth and development, and the maintenance of cellular K+ homeostasis is important for plants to adapt to abiotic stresses and growth. However, the mechanism involved has not been understood clearly. In this study, we demonstrated that AtUNC-93 plays a crucial role in this process under the control of abscisic acid (ABA). AtUNC-93 was localized to the plasma membrane and mainly expressed in the vascular tissues in Arabidopsis thaliana ...
2018: Frontiers in Plant Science
Shi-Jian Song, Qiang-Nan Feng, Chunlong Li, En Li, Qi Liu, Hui Kang, Wei Zhang, Yan Zhang, Sha Li
Stomatal movement, critical for photobiosynthesis, respiration, and stress responses, is regulated by many factors, among which abscisic acid (ABA) is critical. Early events of ABA signaling involve Ca2+ influx and an increase of cytoplasmic calcium ([Ca2+]cyt). Positive regulators of this process have been extensively studied, whereas negative regulators are obscure. ABA-induced stomatal closure involves K+ flux and vacuolar convolution. How these processes are connected with Ca2+ is not fully understood. We report that pat10-1, a null mutant of Arabidopsis (Arabidopsis thaliana) PROTEIN S-ACYL TRANSFERASE10 (PAT10), is hypersensitive to ABA-induced stomatal closure and vacuolar convolution...
June 13, 2018: Plant Physiology
Yang Zhao, Zhengjing Zhang, Jinghui Gao, Pengcheng Wang, Tao Hu, Zegang Wang, Yueh-Ju Hou, Yizhen Wan, Wenshan Liu, Shaojun Xie, Tianjiao Lu, Liang Xue, Yajie Liu, Alberto P Macho, W Andy Tao, Ray A Bressan, Jian-Kang Zhu
Abscisic acid (ABA) is an important phytohormone controlling responses to abiotic stresses and is sensed by proteins from the PYR/PYL/RCAR family. To explore the genetic contribution of PYLs toward ABA-dependent and ABA-independent processes, we generated and characterized high-order Arabidopsis mutants with mutations in the PYL family. We obtained a pyl quattuordecuple mutant and found that it was severely impaired in growth and failed to produce seeds. Thus, we carried out a detailed characterization of a pyl duodecuple mutant, pyr1pyl1/2/3/4/5/7/8/9/10/11/12...
June 12, 2018: Cell Reports
Satinder Kour, Vikramjit K Zhawar
Post-germination desiccation tolerance (DT) was studied in two wheat cultivars. Effect of pretreatment of abscisic acid (ABA)/ osmotic/ salt/ heat stress was also studied. One day (d)-old seedlings of wheat cultivars PBW 644 (drought tolerant) and PBW 343 (drought susceptible) were exposed to ABA/stress treatment for next 1 d, desiccated for 4 d and subsequently rehydrated for 4 d. Biomass, protein, water, protein carbonyls (oxidative toxicity) and nitric oxide (NO) levels were measured in 2 d (treated), 6 d (desiccated), 10 d (rehydrated) seedlings...
April 2018: Anais da Academia Brasileira de Ciências
Thais Cremon, Daiane M Dresch, Silvana P Q Scalon, Tathiana E Masetto
The intense environmental degradation in tropical regions suitable for agriculture has decreased native forest populations of plants with important fruits and medicinal properties. Alibertia edulis is a native tree from the Brazilian Cerrado. Knowledge about the effects of drying and storage on the physiological behavior of its seeds may aid in its sustainable exploitation and conservation. The goal of the present study was to determine which fruit ripening stage results in A. edulis seeds with higher tolerance to desiccation, and to investigate the effectiveness of polyethylene glycol (PEG) induced osmotic stress in combination with abscisic acid (ABA) in increasing seed desiccation tolerance during storage...
April 2018: Anais da Academia Brasileira de Ciências
Silvia Pressel, Karen S Renzaglia, Richard S Dicky Clymo, Jeffrey G Duckett
Backgrounds and Aims: Because stomata in bryophytes occur on sporangia, they are subject to different developmental and evolutionary constraints from those on leaves of tracheophytes. No conclusive experimental evidence exists on the responses of hornwort stomata to exogenous stimulation. Methods : Responses of hornwort stomata to abscisic acid (ABA), desiccation, darkness and plasmolysis were compared with those in tracheophyte leaves. Potassium ion concentrations in the guard cells and adjacent cells were analysed by X-ray microanalysis, and the ontogeny of the sporophytic intercellular spaces was compared with those of tracheophytes by cryo-scanning electron microscopy...
April 20, 2018: Annals of Botany
Yong Zhou, Lifang Hu, Lunwei Jiang, Shiqiang Liu
YTH domain-containing RNA-binding proteins are involved in post-transcriptional regulation and play important roles in the growth and development as well as abiotic stress responses of plants. However, YTH genes have not been previously studied in cucumber (Cucumis sativus). In this study, a total of five YTH genes (CsYTH1-CsYTH5) were identified in cucumber, which could be mapped on three out of the seven cucumber chromosomes. All CsYTH proteins had highly conserved C-terminal YTH domains, and two of them (CsYTH1 and CsYTH4) harbored extra CCCH and P/Q/N-rich domains...
June 2018: Genes & Genomics
Elizabeth K K Glennon, Dewi Megawati, Brandi K Torrevillas, Isaac Ssewanyana, Liusheng Huang, Fran Aweeka, Bryan Greenhouse, L Garry Adams, Shirley Luckhart
Abscisic acid (ABA) is an ancient stress hormone and is detectable in a wide variety of organisms where it regulates innate immunity and inflammation. Previously, we showed that oral supplementation with ABA decreased parasitemia in a mouse model of malaria, decreased liver and spleen pathology and reduced parasite transmission to mosquitoes. Here, we report that higher circulating ABA levels were associated with a reduced risk of symptomatic malaria in a cohort of Plasmodium falciparum-infected Ugandan children...
June 11, 2018: Scientific Reports
Elaine Yeung, Hans van Veen, Divya Vashisht, Ana Luiza Sobral Paiva, Maureen Hummel, Tom Rankenberg, Bianka Steffens, Anja Steffen-Heins, Margret Sauter, Michel de Vries, Robert C Schuurink, Jérémie Bazin, Julia Bailey-Serres, Laurentius A C J Voesenek, Rashmi Sasidharan
Abiotic stresses in plants are often transient, and the recovery phase following stress removal is critical. Flooding, a major abiotic stress that negatively impacts plant biodiversity and agriculture, is a sequential stress where tolerance is strongly dependent on viability underwater and during the postflooding period. Here we show that in Arabidopsis thaliana accessions (Bay-0 and Lp2-6), different rates of submergence recovery correlate with submergence tolerance and fecundity. A genome-wide assessment of ribosome-associated transcripts in Bay-0 and Lp2-6 revealed a signaling network regulating recovery processes...
June 11, 2018: Proceedings of the National Academy of Sciences of the United States of America
Li Aihua, Jiang Shunyuan, Yang Guang, Li Ying, Guo Na, Chen Tong, Kang Liping, Huang Luqi
BACKGROUND: Notopterygium incisum is an important Chinese medicinal plant. Its mature seeds have underdeveloped embryos and are physiological dormant. We found the seeds with full developed embryos can germinate after treated by fluridone (FL), an inhibitor of abscisic acid (ABA). In order to understand the molecular mechanisms underlying seed dormancy release by FL, we compared the transcriptomic changes in dormancy release induced by two different methods, FL and cold stratification (CS) in N...
June 11, 2018: BMC Plant Biology
Shuangming Li, Yong Yang, Qiang Zhang, Ningfang Liu, Qingguo Xu, Longxing Hu
Low temperature is one of the important limiting factors for growing season and geographical distribution of plants. Zoysiagrass (Zoysia Willd) is one of the widely used warm-season turfgrass that is distribute in many parts of the world. Zoysaigrass native to high latitude may have evolved higher cold tolerance than the ones native to low latitude. The objective of this study was to investigate the cold stress response in zoysiagrass native to diverse latitude at phenotypic, physiological and metabolic levels...
2018: PloS One
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