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https://www.readbyqxmd.com/read/29471274/accession-specific-life-strategies-affect-responses-in-leaves-of-arabidopsis-thaliana-plants-exposed-to-excess-cu-and-cd
#1
Rafaela Amaral Dos Reis, Els Keunen, Miguel Pedro Mourato, Luísa Louro Martins, Jaco Vangronsveld, Ann Cuypers
The natural accession Columbia (Col-0) is considered as the reference genome of the model plant Arabidopsis thaliana. Nonetheless, Col-0 plants are more sensitive to excess copper (Cu) and cadmium (Cd) than other widely used accessions such as Wassilewskija (Ws) plants. In the current study, this accession-specific metal sensitivity is further explored by comparing the responses in leaves of Col-0 and Ws plants exposed to excess Cu and Cd. Our results suggest that different life strategies favored by both accessions under physiological conditions affect their response to metal exposure...
February 6, 2018: Journal of Plant Physiology
https://www.readbyqxmd.com/read/29467784/heterologous-expression-of-the-cotton-nbs-lrr-gene-gbana1-enhances-verticillium-wilt-resistance-in-arabidopsis
#2
Nan-Yang Li, Lei Zhou, Dan-Dan Zhang, Steven J Klosterman, Ting-Gang Li, Yue-Jing Gui, Zhi-Qiang Kong, Xue-Feng Ma, Dylan P G Short, Wen-Qi Zhang, Jun-Jiao Li, Krishna V Subbarao, Jie-Yin Chen, Xiao-Feng Dai
Verticillium wilt caused by Verticillium dahliae results in severe losses in cotton, and is economically the most destructive disease of this crop. Improving genetic resistance is the cleanest and least expensive option to manage Verticillium wilt. Previously, we identified the island cotton NBS-LRR-encoding gene GbaNA1 that confers resistance to the highly virulent V. dahliae isolate Vd991. In this study, we expressed cotton GbaNA1 in the heterologous system of Arabidopsis thaliana and investigated the defense response mediated by GbaNA1 following inoculations with V...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29463697/membrane-protein-mhz3-stabilizes-osein2-in-rice-by-interacting-with-its-nramp-like-domain
#3
Biao Ma, Yang Zhou, Hui Chen, Si-Jie He, Yi-Hua Huang, He Zhao, Xiang Lu, Wan-Ke Zhang, Jin-Huan Pang, Shou-Yi Chen, Jin-Song Zhang
The phytohormone ethylene regulates many aspects of plant growth and development. EIN2 is the central regulator of ethylene signaling, and its turnover is crucial for triggering ethylene responses. Here, we identified a stabilizer of OsEIN2 through analysis of the rice ethylene-response mutant mhz3. Loss-of-function mutations lead to ethylene insensitivity in etiolated rice seedlings. MHZ3 encodes a previously uncharacterized membrane protein localized to the endoplasmic reticulum. Ethylene induces MHZ3 gene and protein expression...
February 20, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29447166/a-molecular-basis-behind-heterophylly-in-an-amphibious-plant-ranunculus-trichophyllus
#4
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
#5
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/29410312/ethylene-signaling-triggered-by-low-concentrations-of-ascorbic-acid-regulates-biomass-accumulation-in-arabidopsis-thaliana
#6
M Caviglia, L M Mazorra Morales, A Concellón, G E Gergoff Grozeff, M Wilson, C H Foyer, C G Bartoli
Ascorbic acid (AA) is a major redox buffer in plant cells. The role of ethylene in the redox signaling pathways that influence photosynthesis and growth was explored in two independent AA deficient Arabidopsis thaliana mutants (vtc2-1 and vtc2-4). Both mutants, which are defective in the AA biosynthesis gene GDP-L-galactose phosphorylase, produce higher amounts of ethylene than wt plants. In contrast to the wt, the inhibition of ethylene signaling increased leaf conductance, photosynthesis and dry weight in both vtc2 mutant lines...
February 1, 2018: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/29365162/microrna1917-targets-ctr4-splice-variants-to-regulate-ethylene-responses-in-tomato
#7
Yanling Wang, Wenxiong Zou, Yan Xiao, Lina Cheng, Yudong Liu, Song Gao, Zihang Shi, Yun Jiang, Mingfang Qi, Tao Xu, Tianlai Li
Ethylene perception is regulated by receptors, and the downstream protein CONSTITUTIVE TRIPLE RESPONSE1 is a key suppressor of ethylene signalling. The non-conserved tomato (Solanum lycopersicum) microRNA1917 (Sly-miR1917) mediates degradation of SlCTR4 splice variants (SlCTR4sv) but the molecular details of this pathway remain unknown. Sly-miR1917 and the targeted SlCTR4sv are ubiquitously expressed in all tomato organs. Overexpression of Sly-miR1917 enhances ethylene responses, including the triple response in etiolated seedlings, in the absence of ethylene, as well as epinastic petiole growth, accelerated pedicel abscission, and fruit ripening...
January 22, 2018: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29350442/role-of-ethylene-and-related-gene-expression-in-the-interaction-between-strawberry-plants-and-the-plant-growth-promoting-bacterium-azospirillum-brasilense
#8
J M Elías, M F Guerrero-Molina, M G Martínez-Zamora, J C Díaz-Ricci, R O Pedraza
• The induced systemic resistance (ISR) is one of the indirect mechanisms of growth promotion exerted by plant growth-promoting bacteria, and can be mediated by ethylene (ET). We assessed the ET production and the expression of related genes in the Azospirillum-strawberry plant interaction. • ET production was evaluated by gas chromatography in plants inoculated or not with A. brasilense REC3. Also, plants were treated with AgNO3 , an inhibitor of ET biosynthesis; with 1-aminocyclopropane-1-carboxylic-acid (ACC), a precursor of ET biosynthesis; and with indole acetic acid (IAA)...
January 19, 2018: Plant Biology
https://www.readbyqxmd.com/read/29324765/brassinosteroids-regulate-root-growth-by-controlling-reactive-oxygen-species-homeostasis-and-dual-effect-on-ethylene-synthesis-in-arabidopsis
#9
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 11, 2018: PLoS Genetics
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/29238356/arbuscular-mycorrhizal-fungus-enhances-lateral-root-formation-in-poncirus-trifoliata-l-as-revealed-by-rna-seq-analysis
#11
Weili Chen, Juan Li, Honghui Zhu, Pengyang Xu, Jiezhong Chen, Qing Yao
Arbuscular mycorrhizal fungi (AMF) establish symbiosis with most terrestrial plants, and greatly regulate lateral root (LR) formation. Phosphorus (P), sugar, and plant hormones are proposed being involved in this regulation, however, no global evidence regarding these factors is available so far, especially in woody plants. In this study, we inoculated trifoliate orange seedlings (Poncirus trifoliata L. Raf) with an AMF isolate, Rhizophagus irregularis BGC JX04B. After 4 months of growth, LR formation was characterized, and sugar contents in roots were determined...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29236179/effects-of-glucose-and-ethylene-on-root-hair-initiation-and-elongation-in-lettuce-lactuca-sativa-l-seedlings
#12
Wakana Harigaya, Hidenori Takahashi
Root hair formation occurs in lettuce seedlings after transfer to an acidic medium (pH 4.0). This process requires cortical microtubule (CMT) randomization in root epidermal cells and the plant hormone ethylene. We investigated the interaction between ethylene and glucose, a new signaling molecule in plants, in lettuce root development, with an emphasis on root hair formation. Dark-grown seedlings were used to exclude the effect of photosynthetically produced glucose. In the dark, neither root hair formation nor the CMT randomization preceding it occurred, even after transfer to the acidic medium (pH 4...
December 13, 2017: Journal of Plant Research
https://www.readbyqxmd.com/read/29187569/dynamics-of%C3%A2-lotus-japonicus%C3%A2-ethylene-production-in-response-to-compatible-nod-factor
#13
Dugald Elgin Reid, Huijun Liu, Simon Kelly, Yasuyuki Kawaharada, Terry Mun, Stig U Andersen, Guilhem J Desbrosses, Jens Stougaard
Establishment of symbiotic nitrogen-fixation in legumes is regulated by the plant hormone ethylene, but it has remained unclear whether and how its biosynthesis is regulated by the symbiotic pathway. We established a sensitive ethylene detection system for Lotus japonicus and found that ethylene production increased as early as six hours after inoculation with Mesorhizobium loti. This ethylene response was dependent on Nod factor production by compatible rhizobia. Analyses of nodulation mutants showed that perception of Nod factor was required for ethylene emission, while downstream transcription factors including CYCLOPS, NIN and ERN1 were not required for this response...
November 29, 2017: Plant Physiology
https://www.readbyqxmd.com/read/29167353/coordinated-regulation-of-hypocotyl-cell-elongation-by-light-and-ethylene-through-a-microtubule-destabilizing-protein
#14
Qianqian Ma, Xiaohong Wang, Jingbo Sun, Tonglin Mao
Precise regulation of hypocotyl cell elongation is essential for plant growth and survival. Light suppresses hypocotyl elongation by degrading transcription factor phytochrome-interacting factor 3 (PIF3), whereas the phytohormone ethylene promotes hypocotyl elongation by activating PIF3. However, the underlying mechanisms regarding how these two pathways coordinate downstream effectors to mediate hypocotyl elongation are largely unclear. In this study, we identified the novel Microtubule-Destabilizing Protein 60 (MDP60), which plays a positive role in hypocotyl cell elongation in Arabidopsis; this effect is mediated through PIF3...
November 22, 2017: Plant Physiology
https://www.readbyqxmd.com/read/29163621/transcript-profiling-of-hevea-brasiliensis-during-latex-flow
#15
Jinquan Chao, Shuguang Yang, Yueyi Chen, Wei-Min Tian
Latex exploitation enhances latex regeneration in rubber trees. The latex exploitation-caused latex flow lasts from 10 min to a few hours, which is convenient for exploring the transcript profiling of latex metabolism-related genes at the different stages of latex flow. In the present study, the expression pattern of 62 latex metabolism-related genes involved in water transportation, carbohydrate metabolism, natural rubber biosynthesis, hormone signaling, ROS generation and scavenging, and latex coagulum across three stages of latex flow between rubber tree clones CATAS7-33-97 and CATAS8-79 were comparatively analyzed by quantitative real-time PCR...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29160805/indole-3-butyric-acid-induces-ectopic-formation-of-metaxylem-in-the-hypocotyl-of-arabidopsis-thaliana-without-conversion-into-indole-3-acetic-acid-and-with-a-positive-interaction-with-ethylene
#16
Laura Fattorini, Federica Della Rovere, Eleonora Andreini, Marilena Ronzan, Giuseppina Falasca, Maria Maddalena Altamura
The role of the auxins indole-3-acetic acid (IAA) and indole-3-butyric acid (IBA) and of the auxin-interacting phytohormone ethylene, on the ectopic formation of primary xylem (xylogenesis in planta) is still little known. In particular, auxin/ethylene-target tissue(s), modality of the xylary process (trans-differentiation vs. de novo formation), and the kind of ectopic elements formed (metaxylem vs. protoxylem) are currently unknown. It is also unclear whether IBA may act on the process independently of conversion into IAA...
November 21, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29158332/ethylene-receptors-signal-via-a-non-canonical-pathway-to-regulate-abscisic-acid-responses
#17
Arkadipta Bakshi, Sarbottam Piya, Jessica C Fernandez, Christian Chervin, Tarek Hewezi, Brad Binder
Ethylene is a gaseous plant hormone perceived by a family of receptors in Arabidopsis thaliana including ETHYLENE RESPONSE1 (ETR1) and ETR2. Previously we showed that etr1-6 loss-of-function plants germinate better and etr2-3 loss-of-function plants germinate worse than wild-type under NaCl stress and in response to abscisic acid (ABA). In this study, we expanded these results by showing that ETR1 and ETR2 have contrasting roles in the control of germination under a variety of inhibitory conditions for seed germination such as treatment with KCl, CuSO4, ZnSO4, and ethanol...
November 20, 2017: Plant Physiology
https://www.readbyqxmd.com/read/29114016/ein3-and-pif3-form-an-interdependent-module-that-represses-chloroplast-development-in-buried-seedlings
#18
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/29096083/gene-network-underlying-the-response-of-harvested-pepper-to-chilling-stress
#19
Sun-Young Shin, Me-Hea Park, Ji-Weon Choi, Ji-Gang Kim
Cold storage is an effective postharvest control strategy to maintain the freshness of vegetables by suppressing respiration. However, subtropical plants including pepper (Capsicum annuum L.) undergo chilling injury. To better understand the molecular mechanisms involved in preventing chilling injury, transcriptome profiling analysis of peppers stored in a cold chamber and treated with 50μM methyl jasmonate (MeJA) and 1μLL(-1) 1-methylcyclopropene as an ethylene reaction inhibitor was performed. A total of 240, 470, and 290 genes were upregulated and 184, 291, and 219 genes down-regulated in cold-, MeJA- and 1-methylcyclopropene-treated peppers, respectively...
October 28, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/29090631/bacillus-cereus-ar156-activates-defense-responses-to-pseudomonas-syringae-pv-tomato-in-arabidopsis-thaliana-similarly-to-flg22
#20
Shune Wang, Ying Zheng, Chun Gu, Chan He, Mengying Yang, Xin Zhang, Jianhua Guo, Hongwei Zhao, Dongdong Niu
Bacillus cereus AR156 (AR156) is a plant growth promoting rhizobacterium capable of inducing systemic resistance to Pseudomonas syringae pv. tomato (Pst) in Arabidopsis thaliana (Arabidopsis). Here we show that when applied to Arabidopsis leaves, AR156 acted similarly to flg22, a typical pathogen-associated molecular pattern (PAMP), in initiating PAMP-triggered immunity (PTI). AR156-elicited PTI responses included phosphorylation of MPK3 and MPK6, induction of the expression of defense-related genes PR1, FRK1, WRKY22, and WRKY29; production of reactive oxygen species; and callose deposition...
November 1, 2017: Molecular Plant-microbe Interactions: MPMI
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