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https://www.readbyqxmd.com/read/28073951/nod-factors-potentiate-auxin-signaling-for-transcriptional-regulation-and-lateral-root-formation-in-medicago-truncatula
#1
Violaine Herrbach, Ximena Chirinos, David Rengel, Kokoévi Agbevenou, Rémy Vincent, Stéphanie Pateyron, Stéphanie Huguet, Sandrine Balzergue, Asher Pasha, Nicholas Provart, Clare Gough, Sandra Bensmihen
Nodulation (Nod) factors (NFs) are symbiotic molecules produced by rhizobia that are essential for establishment of the rhizobium-legume endosymbiosis. Purified NFs can stimulate lateral root formation (LRF) in Medicago truncatula, but little is known about the molecular mechanisms involved. Using a combination of reporter constructs, pharmacological and genetic approaches, we show that NFs act on early steps of LRF in M. truncatula, independently of the ethylene signaling pathway and of the cytokinin receptor MtCRE1, but in interaction with auxin...
January 10, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28025888/analysis-of-the-xyloglucan-endotransglucosylase-hydrolase-gene-family-during-apple-fruit-ripening-and-softening
#2
Zongying Zhang, Nan Wang, Shenghui Jiang, Haifeng Xu, Yicheng Wang, Chuanzeng Wang, Min Li, Jingxuan Liu, Changzhi Qu, Wen Liu, Shujing Wu, Xiaoliu Chen, Xuesen Chen
Ethylene and Xyloglucan endotransglucosylase/hydrolase (XTH) genes were important for fruit ripening and softening in 'Taishanzaoxia' apple. In this study, we found it was ACS1-1/-1 homozygotes in 'Taishanzaoxia' apple, which determined the higher transcription activity of ACS1. XTH1, XTH3, XTH4, XTH5 and XTH9 were mainly involved in the early fruit softening independent on ethylene, while XTH2, XTH6, XTH7, XTH8, XTH10 and XTH11 predominantly involved in the late fruit softening dependent on ethylene. Overexpression of XTH2 and XTH10 in tomato resulted in the elevated expression of genes involved in ethylene biosynthesis (ACS2, ACO1), signal transduction (ERF2) and fruit softening (XTHs, PG2A, Cel2 and TBG4)...
December 27, 2016: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/27994186/lcmkk-a-mapk-kinase-from-lycium-chinense-confers-cadmium-tolerance-in-transgenic-tobacco-by-transcriptional-upregulation-of-ethylene-responsive-transcription-factor-gene
#3
Chunfeng Guan, Jing Ji, Xiaozhou Li, Chao Jin, Gang Wang
Cadmium (Cd) is a highly toxic element to plants. Ethylene is an important phytohormone in the regulation of plant growth, development and stress response. Mitogen-activated protein kinase (MAPK) activation has been observed in plants exposed to Cd stress and was suggested to be involved in ethylene biosynthesis. We hypothesized that there may be a link between MAPK cascades and ethylene signalling in Cd-stressed plants. To test this hypothesis, the expression of LcMKK, LchERF and LcGSH1 genes, endogenous ethylene accumulation, GSH content and Cd concentration in Lycium chinense with or without Cd stress treatment were studied...
December 2016: Journal of Genetics
https://www.readbyqxmd.com/read/27973616/transcriptome-analysis-provides-a-preliminary-regulation-route-of-the-ethylene-signal-transduction-component-slein2-during-tomato-ripening
#4
Rui-Heng Wang, Xin-Yu Yuan, Lan-Huan Meng, Ben-Zhong Zhu, Hong-Liang Zhu, Yun-Bo Luo, Da-Qi Fu
Ethylene is crucial in climacteric fruit ripening. The ethylene signal pathway regulates several physiological alterations such as softening, carotenoid accumulation and sugar level reduction, and production of volatile compounds. All these physiological processes are controlled by numerous genes and their expression simultaneously changes at the onset of ripening. Ethylene insensitive 2 (EIN2) is a key component for ethylene signal transduction, and its mutation causes ethylene insensitivity. In tomato, silencing SlEIN2 resulted in a non-ripening phenotype and low ethylene production...
2016: PloS One
https://www.readbyqxmd.com/read/27968996/ein3-interferes-with-the-sulfur-deficiency-signaling-in-arabidopsis-thaliana-through-direct-interaction-with-the-slim1-transcription-factor
#5
Anna Wawrzyńska, Agnieszka Sirko
Sulfur deficiency in plants leads to metabolic reprogramming through changes of gene expression. SLIM1 is so far the only characterized transcription factor associated strictly with sulfur deficiency stress in Arabidopsis thaliana. It belongs to the same protein family as EIN3, a major positive switch of ethylene signaling pathway. It binds to the specific cis sequence called UPE-box. Here we show that SLIM1 interacts with UPE-box as a homodimer. Interestingly, the same region of the protein is used for heterodimerization with EIN3; however, the heterodimer is not able to recognize UPE-box...
December 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27964780/reversion-of-hyperhydricity-in-pink-dianthus-chinensis-l-plantlets-by-agno3-and-its-associated-mechanism-during-in-vitro-culture
#6
Hongyang Gao, Xiuying Xia, Lijia An, Xin Xin, Yuan Liang
Hyperhydricity occurs frequently in plant tissue culture and can severely affect commercial micropropagation and genetic improvement of the cultured plantlets. Hyperhydric shoots are charaterzized by high water content, but how this occurs is still a subject of investigation. Silver ion (Ag(+)) can reduce the extent of hyperhydricity in plants, but its effect on the reversion of hyperhydric plantlets and the underlying mechanism of reversion has not been clarified. In this study, about 67% of the hyperhydric Dianthus chinensis L...
January 2017: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27923118/cutting-out-the-middle-man-in-light-hormone-interactions
#7
Anna N Stepanova, Jose M Alonso
In this issue of Developmental Cell, Shi et al. (2016a) show that red-light-activated phytochrome B interacts with transcriptional regulators of ethylene signaling, EIN3/EIL1, triggering their degradation by bringing the F-box proteins EBF1 and 2 to the complex. These findings provide a paradigm for crosstalk between light and hormone signaling pathways.
December 5, 2016: Developmental Cell
https://www.readbyqxmd.com/read/27889482/the-red-light-receptor-phytochrome-b-directly-enhances-substrate-e3-ligase-interactions-to-attenuate-ethylene-responses
#8
Hui Shi, Xing Shen, Renlu Liu, Chang Xue, Ning Wei, Xing Wang Deng, Shangwei Zhong
Plants germinating under subterranean darkness assume skotomorphogenesis, a developmental program strengthened by ethylene in response to mechanical pressure of soil. Upon reaching the surface, light triggers a dramatic developmental transition termed de-etiolation that requires immediate termination of ethylene responses. Here, we report that light activation of photoreceptor phyB results in rapid degradation of EIN3, the master transcription factor in the ethylene signaling pathway. As a result, light rapidly and efficiently represses ethylene actions...
December 5, 2016: Developmental Cell
https://www.readbyqxmd.com/read/27870849/phosphorylation-of-cbp20-links-microrna-to-root-growth-in-the-ethylene-response
#9
Fan Zhang, Likai Wang, Jae Yun Lim, Taewook Kim, Youngjae Pyo, Sibum Sung, Chanseok Shin, Hong Qiao
Ethylene is one of the most important hormones for plant developmental processes and stress responses. However, the phosphorylation regulation in the ethylene signaling pathway is largely unknown. Here we report the phosphorylation of cap binding protein 20 (CBP20) at Ser245 is regulated by ethylene, and the phosphorylation is involved in root growth. The constitutive phosphorylation mimic form of CBP20 (CBP20S245E or CBP20S245D), while not the constitutive de-phosphorylation form of CBP20 (CBP20S245A) is able to rescue the root ethylene responsive phenotype of cbp20...
November 2016: PLoS Genetics
https://www.readbyqxmd.com/read/27848154/jasmonic-acid-and-ethylene-signaling-pathways-regulate-glucosinolate-levels-in-plants-during-rhizobacteria-induced-systemic-resistance-against-a-leaf-chewing-herbivore
#10
Nurmi Pangesti, Michael Reichelt, Judith E van de Mortel, Eleni Kapsomenou, Jonathan Gershenzon, Joop J A van Loon, Marcel Dicke, Ana Pineda
Beneficial soil microbes can promote plant growth and induce systemic resistance (ISR) in aboveground tissues against pathogens and herbivorous insects. Despite the increasing interest in microbial-ISR against herbivores, the underlying molecular and chemical mechanisms of this phenomenon remain elusive. Using Arabidopsis thaliana and the rhizobacterium Pseudomonas simiae WCS417r (formerly known as P. fluorescens WCS417r), we here evaluate the role of the JA-regulated MYC2-branch and the JA/ET-regulated ORA59-branch in modulating rhizobacteria-ISR to Mamestra brassicae by combining gene transcriptional, phytochemical, and herbivore performance assays...
December 2016: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/27847510/molecular-characterization-and-functional-analysis-of-two-petunia-pheils
#11
Feng Liu, Li Hu, Yuanping Cai, Hong Lin, Juanxu Liu, Yixun Yu
Ethylene plays an important role in flower senescence of many plants. Arabidopsis ETHYLENE INSENSITIVE3 (EIN3) and its homolog EIL1 are the downstream component of ethylene signaling transduction. However, the function of EILs during flower senescence remains unknown. Here, a petunia EIL gene, PhEIL2, was isolated. Phylogenetic tree showed that PhEIL1, whose coding gene is previously isolated, and PhEIL2 are the homologs of Arabidopsis AtEIL3 and AtEIL1, respectively. The expression of both PhEIL1 and PhEIL2 is the highest in corollas and increased during corolla senescence...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27831474/ethylene-and-auxin-interaction-in-the-control-of-adventitious-rooting-in-arabidopsis-thaliana
#12
A Veloccia, L Fattorini, F Della Rovere, A Sofo, S D'Angeli, C Betti, G Falasca, M M Altamura
Adventitious roots (ARs) are post-embryonic roots essential for plant survival and propagation. Indole-3-acetic acid (IAA) is the auxin that controls AR formation; however, its precursor indole-3-butyric acid (IBA) is known to enhance it. Ethylene affects many auxin-dependent processes by affecting IAA synthesis, transport and/or signaling, but its role in AR formation has not been elucidated. This research investigated the role of ethylene in AR formation in dark-grown Arabidopsis thaliana seedlings, and its interaction with IAA/IBA...
December 2016: Journal of Experimental Botany
https://www.readbyqxmd.com/read/27830829/cellulase-from-trichoderma-harzianum-interacts-with-roots-and-triggers-induced-systemic-resistance-to-foliar-disease-in-maize
#13
Kandasamy Saravanakumar, Lili Fan, Kehe Fu, Chuanjin Yu, Meng Wang, Hai Xia, Jianan Sun, Yaqian Li, Jie Chen
Trichoderma harzianum is well known to exhibit induced systemic resistance (ISR) to Curvularia leaf spot. We previously reported that a C6 zinc finger protein (Thc6) is responsible for a major contribution to the ISR to the leaf disease, but the types of effectors and the signals mediated by Thc6 from Trichoderma are unclear. In this work, we demonstrated that two hydrolases, Thph1 and Thph2, from T. harzianum were regulated by Thc6. Furthermore, an electrophoretic mobility shift assay (EMSA) study revealed that Thc6 regulated mRNA expression by binding to GGCTAA and GGCTAAA in the promoters of the Thph1 and Thph2 genes, respectively...
November 10, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27829023/constans-like-9-oscol9-interacts-with-receptor-for-activated-c-kinase-1-osrack1-to-regulate-blast-resistance-through-salicylic-acid-and-ethylene-signaling-pathways
#14
Hao Liu, Shuangyu Dong, Dayuan Sun, Wei Liu, Fengwei Gu, Yongzhu Liu, Tao Guo, Hui Wang, Jiafeng Wang, Zhiqiang Chen
In a previous transcriptome analysis of early response genes in rice during Magnaporthe oryzae infection, we identified a CONSTANS-like (COL) gene OsCOL9. In the present study, we investigated the functional roles of OsCOL9 in blast resistance. OsCOL9 belonged to group II of the COL protein family, and it contained a BB-box and a C-terminal CCT (CONSTANS, COL and TOC1) domain. OsCOL9 was found in the nucleus of rice cells, and it exerted transcriptional activation activities through its middle region (MR). Magnaporthe oryzae infection induced OsCOL9 expression, and transgenic OsCOL9 knock-out rice plants showed increased pathogen susceptibility...
2016: PloS One
https://www.readbyqxmd.com/read/27822221/activation-of-hls1-by-mechanical-stress-via-ethylene-stabilized-ein3-is-crucial-for-seedling-soil-emergence
#15
Xing Shen, Yanli Li, Ying Pan, Shangwei Zhong
The seeds of terrestrial flowering plants often start their life cycle in subterranean darkness. To protect the fragile apical meristematic tissues and cotyledons from mechanical injuries during soil penetration, dicotyledonous seedlings form an elegant apical hook at the top of the hypocotyl. The apical hook has been considered as an adaption structure to the subterranean environment. However, the role of the apical hook in seedling emergence and the molecular mechanism of apical hook formation under real-life conditions remain highly speculative...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27799284/multiple-phytohormones-promote-root-hair-elongation-by-regulating-a-similar-set-of-genes-in-the-root-epidermis-in-arabidopsis
#16
Shan Zhang, Linli Huang, An Yan, Yihua Liu, Bohan Liu, Chunyan Yu, Aidong Zhang, John Schiefelbein, Yinbo Gan
Multiple phytohormones, including auxin, ethylene, and cytokinin, play vital roles in regulating cell development in the root epidermis. However, their interactions in specific root hair cell developmental stages are largely unexplored. To bridge this gap, we employed genetic and pharmacological approaches as well as transcriptional analysis in order to dissect their distinct and overlapping roles in root hair initiation and elongation in Arabidopsis thaliana Our results show that among auxin, ethylene, and cytokinin, only ethylene induces ectopic root hair cells in wild-type plants, implying a special role of ethylene in the hair initiation stage...
December 2016: Journal of Experimental Botany
https://www.readbyqxmd.com/read/27739520/ethylene-and-hydrogen-peroxide-are-involved-in-brassinosteroid-induced-salt-tolerance-in-tomato
#17
Tong Zhu, Xingguang Deng, Xue Zhou, Lisha Zhu, Lijuan Zou, Pengxu Li, Dawei Zhang, Honghui Lin
Crosstalk between phytohormone pathways is essential in plant growth, development and stress responses. Brassinosteroids (BRs) and ethylene are both pivotal plant growth regulators, and the interaction between these two phytohormones in the tomato response to salt stress is still unclear. Here, we explored the mechanism by which BRs affect ethylene biosynthesis and signaling in tomato seedlings under salt stress. The activity of 1-aminocyclopropane-1-carboxylate synthase (ACS), an ethylene synthesis enzyme, and the ethylene signaling pathway were activated in plants pretreated with BRs...
October 14, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27716807/local-transcriptional-control-of-yucca-regulates-auxin-promoted-root-growth-inhibition-in-response-to-aluminium-stress-in-arabidopsis
#18
Guangchao Liu, Shan Gao, Huiyu Tian, Wenwen Wu, Hélène S Robert, Zhaojun Ding
Auxin is necessary for the inhibition of root growth induced by aluminium (Al) stress, however the molecular mechanism controlling this is largely unknown. Here, we report that YUCCA (YUC), which encodes flavin monooxygenase-like proteins, regulates local auxin biosynthesis in the root apex transition zone (TZ) in response to Al stress. Al stress up-regulates YUC3/5/7/8/9 in the root-apex TZ, which we show results in the accumulation of auxin in the root-apex TZ and root-growth inhibition during the Al stress response...
October 2016: PLoS Genetics
https://www.readbyqxmd.com/read/27701783/activation-of-ethylene-signaling-pathways-enhances-disease-resistance-by-regulating-ros-and-phytoalexin-production-in-rice
#19
Chao Yang, Wen Li, Jidong Cao, Fanwei Meng, Yongqi Yu, Junkai Huang, Lan Jiang, Muxing Liu, Zhengguang Zhang, Xuewei Chen, Koji Miyamoto, Hisakazu Yamane, Jinsong Zhang, Shouyi Chen, Jun Liu
Ethylene plays diverse roles in plant growth, development and stress responses. However, the roles of ethylene signaling in immune responses remain largely unknown. In this study, we showed that the blast fungus Magnaporthe oryzae infection activated ethylene biosynthesis in rice. Resistant rice cultivars accumulated higher levels of ethylene than susceptible ones. Ethylene signaling components OsEIN2 and the downstream transcription factor OsEIL1 positively regulated disease resistance. Mutation of OsEIN2 led to enhanced disease susceptibility...
October 4, 2016: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/27694846/ein2-dependent-regulation-of-acetylation-of-histone-h3k14-and-non-canonical-histone-h3k23-in-ethylene-signalling
#20
Fan Zhang, Bin Qi, Likai Wang, Bo Zhao, Siddharth Rode, Nathaniel D Riggan, Joseph R Ecker, Hong Qiao
Ethylene gas is essential for many developmental processes and stress responses in plants. EIN2 plays a key role in ethylene signalling but its function remains enigmatic. Here, we show that ethylene specifically elevates acetylation of histone H3K14 and the non-canonical acetylation of H3K23 in etiolated seedlings. The up-regulation of these two histone marks positively correlates with ethylene-regulated transcription activation, and the elevation requires EIN2. Both EIN2 and EIN3 interact with a SANT domain protein named EIN2 nuclear associated protein 1 (ENAP1), overexpression of which results in elevation of histone acetylation and enhanced ethylene-inducible gene expression in an EIN2-dependent manner...
October 3, 2016: Nature Communications
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