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https://www.readbyqxmd.com/read/29675029/aaein3-mediates-the-downregulation-of-artemisinin-biosynthesis-by-ethylene-signaling-through-promoting-leaf-senescence-in-artemisia-annua
#1
Yueli Tang, Ling Li, Tingxiang Yan, Xueqing Fu, Pu Shi, Qian Shen, Xiaofen Sun, Kexuan Tang
Artemisinin is an important drug for malaria treatment, which is exclusively produced in Artemisia annua . It's important to dissect the regulatory mechanism of artemisinin biosynthesis by diverse plant hormones and transcription factors. Our study shows ethylene, a plant hormone which accelerates flower and leaf senescence and fruit ripening, suppressed the expression of genes encoding three key enzymes ADS, DBR2, CYP71AV1, and a positive regulator AaORA involved in artemisinin biosynthesis. Then we isolated the gene encoding ETHYLENE-INSENSITIVE3 (EIN3), a key transcription factor in ethylene signaling pathway, by screening the transcriptome and genome database from Artemisia annua , named AaEIN3 ...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29643073/the-plant-hormone-ethylene-restricts-arabidopsis-growth-via-the-epidermis
#2
Irina Ivanova Vaseva, Enas Qudeimat, Thomas Potuschak, Yunlong Du, Pascal Genschik, Filip Vandenbussche, Dominique Van Der Straeten
The gaseous hormone ethylene plays a key role in plant growth and development, and it is a major regulator of stress responses. It inhibits vegetative growth by restricting cell elongation, mainly through cross-talk with auxins. However, it remains unknown whether ethylene controls growth throughout all plant tissues or whether its signaling is confined to specific cell types. We employed a targeted expression approach to map the tissue site(s) of ethylene growth regulation. The ubiquitin E3 ligase complex containing Skp1, Cullin1, and the F-box protein EBF1 or EBF2 (SCFEBF1/2 ) target the degradation of EIN3, the master transcription factor in ethylene signaling...
April 11, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29593753/ethylene-related-gene-expression-networks-in-wood-formation
#3
Carolin Seyfferth, Bernard Wessels, Soile Jokipii-Lukkari, Björn Sundberg, Nicolas Delhomme, Judith Felten, Hannele Tuominen
Thickening of tree stems is the result of secondary growth, accomplished by the meristematic activity of the vascular cambium. Secondary growth of the stem entails developmental cascades resulting in the formation of secondary phloem outwards and secondary xylem (i.e., wood) inwards of the stem. Signaling and transcriptional reprogramming by the phytohormone ethylene modifies cambial growth and cell differentiation, but the molecular link between ethylene and secondary growth remains unknown. We addressed this shortcoming by analyzing expression profiles and co-expression networks of ethylene pathway genes using the AspWood transcriptome database which covers all stages of secondary growth in aspen ( Populus tremula ) stems...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29528636/integration-of-environmental-and-developmental-or-metabolic-control-of-seed-mass-by-sugar-and-ethylene-metabolisms-in-arabidopsis
#4
Lai-Sheng Meng, Meng-Ke Xu, Wen Wan, Jing-Yi Wang
In higher plants, seed mass is an important to evolutionary fitness. In this context, seedling establishment positively correlates with seed mass under conditions of environmental stress. Thus, seed mass constitutes an important agricultural trait. Here, we show loss-of-function of YODA (YDA), a MAPKK Kinase, and decreased seed mass, which leads to susceptibility to drought. Furthermore, we demonstrate that yda disrupts sugar metabolisms but not the gaseous plant hormone, ethylene. Our data suggest that the transcription factor EIN3 (ETHYLENE-INSENSITIVE3), integral to both sugar and ethylene metabolisms, physically interacts with YDA...
March 20, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29528503/ethylene-signaling-induces-gelatinous-layers-with-typical-features-of-tension-wood-in-hybrid-aspen
#5
Judith Felten, Jorma Vahala, Jonathan Love, András Gorzsás, Markus Rüggeberg, Nicolas Delhomme, Joanna Leśniewska, Jaakko Kangasjärvi, Torgeir R Hvidsten, Ewa J Mellerowicz, Björn Sundberg
The phytohormone ethylene impacts secondary stem growth in plants by stimulating cambial activity, xylem development and fiber over vessel formation. We report the effect of ethylene on secondary cell wall formation and the molecular connection between ethylene signaling and wood formation. We applied exogenous ethylene or its precursor 1-aminocyclopropane-1-carboxylic acid (ACC) to wild-type and ethylene-insensitive hybrid aspen trees (Populus tremula × tremuloides) and studied secondary cell wall anatomy, chemistry and ultrastructure...
March 12, 2018: New Phytologist
https://www.readbyqxmd.com/read/29447166/a-molecular-basis-behind-heterophylly-in-an-amphibious-plant-ranunculus-trichophyllus
#6
Juhyun Kim, Youngsung Joo, Jinseul Kyung, Myeongjune Jeon, Jong Yoon Park, Ho Gyun Lee, Doo Soo Chung, Eunju Lee, Ilha Lee
Ranunculus trichophyllus is an amphibious plant that produces thin and cylindrical leaves if grown under water but thick and broad leaves if grown on land. We found that such heterophylly is widely controlled by two plant hormones, abscisic acid (ABA) and ethylene, which control terrestrial and aquatic leaf development respectively. Aquatic leaves produced higher levels of ethylene but lower levels of ABA than terrestrial leaves. In aquatic leaves, its distinct traits with narrow shape, lack of stomata, and reduced vessel development were caused by EIN3-mediated overactivation of abaxial genes, RtKANADIs, and accompanying with reductions of STOMAGEN and VASCULAR-RELATED NAC-DOMAIN7 (VDN7)...
February 15, 2018: PLoS Genetics
https://www.readbyqxmd.com/read/29431630/ethylene-signaling-modulates-cortical-microtubule-reassembly-in-response-to-salt-stress
#7
Liru Dou, KaiKai He, Takumi Higaki, Xiangfeng Agricultural Wang, Tonglin Mao
Regulation of cortical microtubule reorganization is essential for the survival of plant cells exposed to high salinity. In response to salt stress, microtubules undergo fast depolymerization followed by reassembly to form a new microtubule network that favors plant survival. Although this recovery response is essential for adaptation to salt stress in plant cells, the upstream regulatory mechanism for this process is largely unknown. In this study, we demonstrate that ethylene signaling facilitates salt-stress-induced reassembly of cortical microtubules, which is important for Arabidopsis survival under conditions of high salinity...
February 5, 2018: Plant Physiology
https://www.readbyqxmd.com/read/29324765/brassinosteroids-regulate-root-growth-by-controlling-reactive-oxygen-species-homeostasis-and-dual-effect-on-ethylene-synthesis-in-arabidopsis
#8
Bingsheng Lv, Huiyu Tian, Feng Zhang, Jiajia Liu, Songchong Lu, Mingyi Bai, Chuanyou Li, Zhaojun Ding
The brassinosteroids (BRs) represent a class of phytohormones, which regulate numerous aspects of growth and development. Here, a det2-9 mutant defective in BR synthesis was identified from an EMS mutant screening for defects in root length, and was used to investigate the role of BR in root development in Arabidopsis. The det2-9 mutant displays a short-root phenotype, which is result from the reduced cell number in root meristem and decreased cell size in root maturation zone. Ethylene synthesis is highly increased in the det2-9 mutant compared with the wild type, resulting in the hyper-accumulation of ethylene and the consequent inhibition of root growth...
January 2018: PLoS Genetics
https://www.readbyqxmd.com/read/29259106/identification-of-transcriptional-and-receptor-networks-that-control-root-responses-to-ethylene
#9
Alexandria F Harkey, Justin Watkins, Amy L Olex, Kathleen T DiNapoli, Daniel Lewis, Brad Binder, Jacquelyn S Fetrow, Gloria K Muday
Transcriptomic analyses with high temporal resolution provide substantial new insight into hormonal response networks. This study identified the kinetics of genome-wide transcript abundance changes in response to elevated levels of the plant hormone ethylene in roots from light grown Arabidopsis seedlings, which were overlaid on time matched developmental changes. Functional annotation of clusters of transcripts with similar temporal patterns revealed rapidly-induced clusters with known ethylene function, and more slowly regulated clusters with novel predicted functions linked to root development...
December 19, 2017: Plant Physiology
https://www.readbyqxmd.com/read/29250093/-xap5-circadian-timekeeper-positively-regulates-resistance-to-powdery-mildew8-1-mediated-immunity-in-arabidopsis
#10
Yong-Ju Xu, Yang Lei, Ran Li, Ling-Li Zhang, Zhi-Xue Zhao, Jing-Hao Zhao, Jing Fan, Yan Li, Hui Yang, Jing Shang, Shunyuan Xiao, Wen-Ming Wang
Ectopic expression of the Arabidopsis RESISTANCE TO POWDERY MILDEW8.1 ( RPW8.1 ) boosts pattern-triggered immunity leading to enhanced resistance to different pathogens in Arabidopsis and rice. However, the underlying regulatory mechanism remains largely elusive. Here, we report that XAP5 CIRCADIAN TIMEKEEPER ( XCT, At2g21150 ) positively regulates RPW8.1 -mediated cell death and disease resistance. Forward genetic screen identified the b3-17 mutant that exhibited less cell death and susceptibility to powdery mildew and bacterial pathogens...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29233944/ethylene-promotes-root-hair-growth-through-coordinated-ein3-eil1-and-rhd6-rsl1-activity-in-arabidopsis
#11
Ying Feng, Ping Xu, Bosheng Li, Pengpeng Li, Xing Wen, Fengying An, Yan Gong, Yi Xin, Ziqiang Zhu, Yichuan Wang, Hongwei Guo
Root hairs are an extensive structure of root epidermal cells and are critical for nutrient acquisition, soil anchorage, and environmental interactions in sessile plants. The phytohormone ethylene (ET) promotes root hair growth and also mediates the effects of different signals that stimulate hair cell development. However, the molecular basis of ET-induced root hair growth remains poorly understood. Here, we show that ET-activated transcription factor ETHYLENE-INSENSITIVE 3 (EIN3) physically interacts with ROOT HAIR DEFECTIVE 6 (RHD6), a well-documented positive regulator of hair cells, and that the two factors directly coactivate the hair length-determining gene RHD6-LIKE 4 ( RSL4 ) to promote root hair elongation...
December 26, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29114016/ein3-and-pif3-form-an-interdependent-module-that-represses-chloroplast-development-in-buried-seedlings
#12
Xiaoqin Liu, Renlu Liu, Yue Li, Xing Shen, Shangwei Zhong, Hui Shi
In buried seedlings, chloroplasts are arrested at the etioplast stage, but they rapidly mature upon emergence of the seedling. Etioplast-chloroplast differentiation is halted through the integration of soil-induced signals, including pressure and the absence of light, although the details on how this information converges to regulate cellular decisions remain unclear. Here, we identify an interdependent transcription module that integrates the mechanical pressure and darkness signals to control chloroplast development in Arabidopsis thaliana Mutations of ETHYLENE-INSENSITIVE3 (EIN3), the primary transcription factor in the ethylene signaling pathway that is activated in response to mechanical pressure, cause early development of etioplasts in the dark and severe photobleaching upon light exposure...
December 2017: Plant Cell
https://www.readbyqxmd.com/read/29040739/papaya-cpein3a-and-cpnac2-co-operatively-regulate-carotenoid-biosynthesis-related-genes-cppds2-4-cplcy-e-and-cpchy-b-during-fruit-ripening
#13
Chang-Chun Fu, Yan-Chao Han, Jian-Fei Kuang, Jian-Ye Chen, Wang-Jin Lu
Papaya is an important tropical fruit with a rich source of carotenoids. The ripening of papaya is a physiological and metabolic process with remarkable changes including accumulation of carotenoids, which depends primarily on the action of ethylene. Ethylene response is mediated by a transcriptional cascade involving the transcription factor families of EIN3/EILs and ERFs. Although ERF members have been reported to control carotenoid production in Arabidopsis and tomato, whether EIN3/EILs are also involved in carotenoid biosynthesis during fruit ripening remains unclear...
December 1, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28931628/type-b-response-regulators-act-as-central-integrators-in-transcriptional-control-of-the-auxin-biosynthesis-enzyme-taa1
#14
Zhenwei Yan, Xin Liu, Karin Ljung, Shuning Li, Wanying Zhao, Fan Yang, Meiling Wang, Yi Tao
During embryogenesis and organ formation, establishing proper gradient is critical for auxin function, which is achieved through coordinated regulation of both auxin metabolism and transport. Expression of auxin biosynthetic genes is often tissue specific and is regulated by environmental signals. However, the underlying regulatory mechanisms remain elusive. Here, we investigated the transcriptional regulation of a key auxin biosynthetic gene, l-Tryptophan aminotransferase of Arabidopsis1 (TAA1). A canonical and a novel Arabidopsis (Arabidopsis thaliana) response regulator (ARR) binding site were identified in the promoter and the second intron of TAA1, which were required for its tissue-specific expression...
November 2017: Plant Physiology
https://www.readbyqxmd.com/read/28890725/the-biphasic-root-growth-response-to-abscisic-acid-in-arabidopsis-involves-interaction-with-ethylene-and-auxin-signalling-pathways
#15
Xiaoqing Li, Lin Chen, Brian G Forde, William J Davies
Exogenous abscisic acid (ABA) is known to either stimulate or inhibit root growth, depending on its concentration. In this study, the roles of ethylene and auxin in this biphasic effect of ABA on root elongation were investigated using chemical inhibitors and mutants. Inhibitors of ethylene perception and biosynthesis and an auxin influx inhibitor were all found to block the inhibitory effect of high ABA concentrations, but not the stimulatory effect of low ABA concentrations. In addition, three ethylene-insensitive mutants (etr1-1, ein2-1, and ein3-1), two auxin influx mutants (aux1-7, aux1-T) and an auxin-insensitive mutant (iaa7/axr2-1) were all insensitive to the inhibitory effect of high ABA concentrations...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28874528/ein2-mediates-direct-regulation-of-histone-acetylation-in-the-ethylene-response
#16
Fan Zhang, Likai Wang, Bin Qi, Bo Zhao, Eun Esther Ko, Nathaniel D Riggan, Kevin Chin, Hong Qiao
Ethylene gas is essential for developmental processes and stress responses in plants. Although the membrane-bound protein EIN2 is critical for ethylene signaling, the mechanism by which the ethylene signal is transduced remains largely unknown. Here we show the levels of H3K14Ac and H3K23Ac are correlated with the levels of EIN2 protein and demonstrate EIN2 C terminus (EIN2-C) is sufficient to rescue the levels of H3K14/23Ac of ein2-5 at the target loci, using CRISPR/dCas9-EIN2-C. Chromatin immunoprecipitation followed by deep sequencing (ChIP-seq) and ChIP-reChIP-seq analyses revealed that EIN2-C associates with histone partially through an interaction with EIN2 nuclear-associated protein1 (ENAP1), which preferentially binds to the genome regions that are associated with actively expressed genes both with and without ethylene treatments...
September 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28842534/light-and-ethylene-coordinately-regulate-the-phosphate-starvation-response-through-transcriptional-regulation-of-phosphate-starvation-response1
#17
Yang Liu, Yurong Xie, Hai Wang, Xiaojing Ma, Wenjun Yao, Haiyang Wang
Plants have evolved an array of adaptive responses to low Pi availability, a process modulated by various external stimuli and endogenous growth regulatory signals. Little is known about how these signaling processes interact to produce an integrated response. Arabidopsis thaliana PHOSPHATE STARVATION RESPONSE1 (PHR1) encodes a conserved MYB-type transcription factor that is essential for programming Pi starvation-induced gene expression and downstream Pi starvation responses (PSRs). Here, we show that loss-of-function mutations in FHY3 and FAR1, encoding two positive regulators of phytochrome signaling, and in EIN3, encoding a master regulator of ethylene responses, cause attenuated PHR1 expression, whereas mutation in HY5, encoding another positive regulator of light signaling, causes increased PHR1 expression...
September 2017: Plant Cell
https://www.readbyqxmd.com/read/28736168/light-dependent-degradation-of-pif3-by-scf-ebf1-2-promotes-a-photomorphogenic-response-in-arabidopsis
#18
Jie Dong, Weimin Ni, Renbo Yu, Xing Wang Deng, Haodong Chen, Ning Wei
Plant seedlings emerging from darkness into the light environment undergo photomorphogenesis, which enables autotrophic growth with optimized morphology and physiology. During this transition, plants must rapidly remove photomorphogenic repressors accumulated in the dark. Among them is PHYTOCHROME-INTERACTING FACTOR 3 (PIF3), a key transcription factor promoting hypocotyl growth. Here we report that, in response to light activation of phytochrome photoreceptors, EIN3-BINDING F BOX PROTEINs (EBFs) 1 and 2 mediate PIF3 protein degradation in a manner dependent on light-induced phosphorylation of PIF3...
August 21, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28625764/genome-wide-identification-and-expression-profiling-of-eil-gene-family-in-woody-plant-representative-poplar-populus-trichocarpa
#19
Ertugrul Filiz, Recep Vatansever, Ibrahim Ilker Ozyigit, Mehmet Emin Uras, Ugur Sen, Naser A Anjum, Eduarda Pereira
This study aimed to improve current understanding on ethylene-insensitive 3-like (EIL) members, least explored in woody plants such as poplar (Populus trichocarpa Torr. & Grey). Herein, seven putative EIL members were identified in P. trichocarpa genome and were roughly annotated either as EIN3-like sequence associated with ethylene pathway or EIL3-like sequences related with sulfur (S)-pathway. Motif-distribution pattern of proteins also corroborated this annotation. They were distributed on six chromosomes (chr1, 3, 4 and 8-10), and were revealed to encode a protein of 509-662 residues with nuclear localization...
August 1, 2017: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28600557/regulatory-functions-of-cellular-energy-sensor-snf1-related-kinase1-for-leaf-senescence-delay-through-ethylene-insensitive3-repression
#20
Geun-Don Kim, Young-Hee Cho, Sang-Dong Yoo
Aging of living organisms is governed by intrinsic developmental programs, of which progression is often under the regulation of their cellular energy status. For example, calorie restriction is known to slow down aging of heterotrophic organisms from yeasts to mammals. In autotrophic plants cellular energy deprivation by perturbation of photosynthesis or sugar metabolism is also shown to induce senescence delay. However, the underlying molecular and biochemical mechanisms remain elusive. Our plant cell-based functional and biochemical assays have demonstrated that SNF1-RELATED KINASE1 (SnRK1) directly interacts, phosphorylates, and destabilizes the key transcription factor ETHYLENE INSENSITIVE3 (EIN3) in senescence-promoting hormone ethylene signaling...
June 9, 2017: Scientific Reports
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