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https://www.readbyqxmd.com/read/29150547/the-tomato-della-protein-procera-acts-in-guard-cells-to-promote-stomatal-closure
#1
Ido Nir, Hagai Shohat, Irina Panizel, Neil E Olszewski, Asaph Aharoni, David Weiss
Plants employ stomatal closure and reduced growth to avoid water deficiency damage. Reduced levels of the growth-promoting hormone gibberellin (GA) lead to increased tolerance to water deficit, but the underlying mechanism is unknown. Here, we show that the tomato (Solanum lycopersicum) DELLA protein PROCERA (PRO), a negative regulator of GA signaling, acts in guard cells to promote stomatal closure and reduce water loss in response to water deficiency by increasing abscisic acid (ABA) sensitivity. The loss-of-function pro mutant exhibited increased stomatal conductance and rapid wilting under water-deficit stress...
November 17, 2017: Plant Cell
https://www.readbyqxmd.com/read/29149646/dependence-of-growth-inhibiting-action-of-increased-planting-density-on-capacity-of-lettuce-plants-to-synthesize-aba
#2
Lidiya B Vysotskaya, Tatyana N Arkhipova, Guzel R Kudoyarova, Stanislav Yu Veselov
Inhibition of lettuce plant growth under increased planting density was accompanied by accumulation of abscisic acid (ABA) in the shoots of competing plants. To check causal relationship between these responses we studied the effect of decreased synthesis of ABA on growth indexes and hormonal balance of lettuce plants under elevated density of their planting (one (single) or three (competing) plants per pot). Herbicide fluridone was used to inhibit ABA synthesis. Preliminary experiments with single plants showed that presence of fluridone in the soil solution at rather low concentration (0...
November 11, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/29149465/controlled-sol-gel-transitions-of-a-thermoresponsive-polymer-in-a-photoswitchable-azobenzene-ionic-liquid-as-a-molecular-machine
#3
Masayoshi Watanabe, Caihong Wang, Kei Hashimoto, Ryota Tamate, Hisashi Kokubo
Producing ionic liquids (ILs) that function as molecular machines for macroscopic change is a challenging issue. We report that photoisomerization of an azobenzene IL at the molecular level could evoke a macroscopic response (light-controlled mechanical sol-gel transitions) for ABA triblock copolymer solutions. The A endblocks, poly(2-phenylethyl methacrylate), show a low critical solution temperature in the IL mixture containing azobenzene while the B midblock, poly(methyl methacrylate), is compatible with the mixture...
November 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29146776/light-signaling-dependent-regulation-of-photoinhibition-and-photoprotection-in-tomato
#4
Feng Wang, Nan Wu, Luyue Zhang, Golam Jalal Ahammed, Xiaoxiao Chen, Xun Xiang, Jie Zhou, Xiaojian Xia, Kai Shi, Jingquan Yu, Christine H Foyer, Yanhong Zhou
Photoreceptor-mediated light signaling plays a critical role in plant growth, development, and stress responses but its contribution to the spatial regulation of photoinhibition and photoprotection within the canopy remains unclear. Here, we show that low red/far-red (L-R/FR) ratio light conditions significantly alleviate PSII and PSI photoinhibition in the shade leaves of tomato plants. This protection is accompanied by a phytochrome A (phyA)-dependent induction of LONG HYPOCOTYL 5 (HY5). HY5 binds to the promoter of ABA INSENSITIVE 5 (ABI5), triggering RESPIRATORY BURST OXIDASE HOMOLOG1 (RBOH1)-dependent H2O2 production in the apoplast...
November 16, 2017: Plant Physiology
https://www.readbyqxmd.com/read/29145809/genome-wide-characterization-and-expression-profiling-of-pdi-family-gene-reveals-function-as-abiotic-and-biotic-stress-tolerance-in-chinese-cabbage-brassica-rapa-ssp-pekinensis
#5
Md Abdul Kayum, Jong-In Park, Ujjal Kumar Nath, Gopal Saha, Manosh Kumar Biswas, Hoy-Taek Kim, Ill-Sup Nou
BACKGROUND: Protein disulfide isomerase (PDI) and PDI-like proteins contain thioredoxin domains that catalyze protein disulfide bond, inhibit aggregation of misfolded proteins, and function in isomerization during protein folding in endoplasmic reticulum and responses during abiotic stresses.Chinese cabbage is widely recognized as an economically important, nutritious vegetable, but its yield is severely hampered by various biotic and abiotic stresses. Because of, it is prime need to identify those genes whose are responsible for biotic and abiotic stress tolerance...
November 16, 2017: BMC Genomics
https://www.readbyqxmd.com/read/29145496/insights-into-soybean-transcriptome-reconfiguration-under-hypoxic-stress-functional-regulatory-structural-and-compositional-characterization
#6
Thiago J Nakayama, Fabiana A Rodrigues, Norman Neumaier, Juliana Marcolino-Gomes, Hugo B C Molinari, Thaís R Santiago, Eduardo F Formighieri, Marcos F Basso, José R B Farias, Beatriz M Emygdio, Ana C B de Oliveira, Ângela D Campos, Aluízio Borém, Frank G Harmon, Liliane M Mertz-Henning, Alexandre L Nepomuceno
Soybean (Glycine max) is one of the major crops worldwide and flooding stress affects the production and expansion of cultivated areas. Oxygen is essential for mitochondrial aerobic respiration to supply the energy demand of plant cells. Because oxygen diffusion in water is 10,000 times lower than in air, partial (hypoxic) or total (anoxic) oxygen deficiency is important component of flooding. Even when oxygen is externally available, oxygen deficiency frequently occurs in bulky, dense or metabolically active tissues such as phloem, meristems, seeds, and fruits...
2017: PloS One
https://www.readbyqxmd.com/read/29140310/effect-of-abscisic-acid-on-accumulation-of-five-active-components-in-root-of-glycyrrhiza-uralensis
#7
Jing Qiao, Zuliang Luo, Yanpeng Li, Guangxi Ren, Chunsheng Liu, Xiaojun Ma
Licorice is one of the most generally used herbal medicines in the world; however, wild licorice resources have decreased drastically. Cultivated Glycyrrhiza uralensis Fischer are the main source of licorice at present, but the content of main active components in cultivated G. uralensis are lower than in wild G. uralensis. Therefore, the production of high-quality cultivated G. uralensis is an urgent issue for the research and production fields. In this study, the content of five active components and seven endogenous phytohormones in cultivated G...
November 15, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29138428/structural-disorder-and-induced-folding-within-two-cereal-aba-stress-and-ripening-asr-proteins
#8
Karama Hamdi, Edoardo Salladini, Darragh P O'Brien, Sébastien Brier, Alexandre Chenal, Ines Yacoubi, Sonia Longhi
Abscisic acid (ABA), stress and ripening (ASR) proteins are plant-specific proteins involved in plant response to multiple abiotic stresses. We previously isolated the ASR genes and cDNAs from durum wheat (TtASR1) and barley (HvASR1). Here, we show that HvASR1 and TtASR1 are consistently predicted to be disordered and further confirm this experimentally. Addition of glycerol, which mimics dehydration, triggers a gain of structure in both proteins. Limited proteolysis showed that they are highly sensitive to protease degradation...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29136371/designing-dendron-polymer-conjugate-based-targeted-drug-delivery-platforms-with-a-mix-and-match-modularity
#9
Burcu Sumer Bolu, Bianka Golba, Nazli Boke, Amitav Sanyal, Rana Sanyal
Polymeric micellar systems are emerging as a very important class of nano-pharmaceuticals due to their ability to improve pharmacokinetics and bio-distribution of chemotherapy drugs, as well as to reduce related systemic toxicities. While these nano sized delivery systems inherently benefit from passive targeting through the enhanced permeation and retention effect leading to increased accumulation in the tumor, additional active targeting can be achieved through surface modification of micelles with targeting groups specific for over-expressed receptors of tumor cells...
November 14, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/29134282/aba-and-iaa-control-microsporogenesis-in-petunia-hybrida-l
#10
L V Kovaleva, A S Voronkov, E V Zakharova, I M Andreev
The formation of fertile male gametophyte is known to require timely degeneration of polyfunctional tapetum tissue. The last process caused by the programmed cell death (PCD) is a part of the anther program maturation which leads to sequential anther tissue destruction coordinated with pollen differentiation. In the present work, distribution of abscisic acid (ABA) and indole-3-acetic acid (IAA) in developing anthers of male-fertile and male-sterile lines of petunia (Petunia hybrida L.) was analyzed by using the immunohistochemical method...
November 13, 2017: Protoplasma
https://www.readbyqxmd.com/read/29131815/the-karrikin-receptor-kai2-promotes-drought-resistance-in-arabidopsis-thaliana
#11
Weiqiang Li, Kien Huu Nguyen, Ha Duc Chu, Chien Van Ha, Yasuko Watanabe, Yuriko Osakabe, Marco Antonio Leyva-González, Mayuko Sato, Kiminori Toyooka, Laura Voges, Maho Tanaka, Mohammad Golam Mostofa, Motoaki Seki, Mitsunori Seo, Shinjiro Yamaguchi, David C Nelson, Chunjie Tian, Luis Herrera-Estrella, Lam-Son Phan Tran
Drought causes substantial reductions in crop yields worldwide. Therefore, we set out to identify new chemical and genetic factors that regulate drought resistance in Arabidopsis thaliana. Karrikins (KARs) are a class of butenolide compounds found in smoke that promote seed germination, and have been reported to improve seedling vigor under stressful growth conditions. Here, we discovered that mutations in KARRIKIN INSENSITIVE2 (KAI2), encoding the proposed karrikin receptor, result in hypersensitivity to water deprivation...
November 13, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/29131016/focal-transplantation-of-aberrant-glial-cells-carrying-the-sod1g93a-mutation-into-rat-spinal-cord-induces-extensive-gliosis
#12
Sofía Ibarburu, Emiliano Trias, Natalia Lago, Hugo Peluffo, Romina Barreto-Núñez, Valentina Varela, Joseph S Beckman, Luis Barbeito
OBJECTIVE: We aimed to determine the potential of aberrant glial cells (AbAs) isolated from the spinal cord of adult SOD1G93A symptomatic rats to induce gliosis and neuronal damage following focal transplantation into the lumbar spinal cord of wild-type rats. METHODS: AbAs were obtained from the spinal cords of SOD1G93A symptomatic rats. One hundred thousand cells were injected using a glass micropipette into the lumbar spinal cords (L3-L5) of syngeneic wild-type adult rats...
November 1, 2017: Neuroimmunomodulation
https://www.readbyqxmd.com/read/29127659/characterization-of-lhsortga2-a-novel-tga2-like-protein-that-interacts-with-lhsornpr1-in-oriental-hybrid-lily-sorbonne
#13
Le Wang, Zhihong Guo, Yubao Zhang, Yajun Wang, Li Wang, Guo Yang, Wenmei Li, Ruoyu Wang, Zhongkui Xie
BACKGROUND: Non-expressor of pathogenesis-related genes 1 (NPR1) regulates expression of pathogenesis-related (PR) genes by interacting with TGA family proteins during systemic acquired resistance (SAR). However, no TGA-like proteins or their interacting partners have been characterized in lily. RESULTS: In the present study, LhSorTGA2, a novel TGA-like protein, was identified as an interacting partner of LhSorNPR1 (an NPR-like protein) by bimolecular fluorescence complementation (BIFC) and yeast two-hybrid assay (Y2H)...
November 10, 2017: Botanical Studies (Taipei, Taiwan)
https://www.readbyqxmd.com/read/29127630/analysis-of-various-effects-of-abamectin-on-erythrocyte-morphology-in-japanese-quails-coturnix-japonica
#14
Denise Braga Gomes de Faria, Mateus Flores Montalvão, Joyce Moreira de Souza, Bruna de Oliveira Mendes, Guilherme Malafaia, Aline Sueli de Lima Rodrigues
Although previous studies have already confirmed the toxicological potential of abamectin (ABA) in different experimental models (from invertebrates to vertebrates), almost nothing is known about the impacts the exposure to this pesticide can cause on birds. Thus, the aim of our study is to investigate the cytotoxic effects on the erythrocytes of female Japanese quails (Coturnix japonica) exposed to low abamectin concentrations. In order to do so, three experimental groups were proposed: "control," composed of quails exposed to abamectin-free drinking water; "ABA 1% median lethal dose (LD50)," comprising birds exposed to water containing 15...
November 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29126265/stomatal-and-growth-responses-to-hydraulic-and-chemical-changes-induced-by-progressive-soil-drying
#15
Xiaoqing Li, Sally Wilkinson, Jianbo Shen, Brian G Forde, William J Davies
A better understanding of physiological responses of crops to drought stress is important for ensuring sustained crop productivity under climate change. Here, we studied the effect on 15-day-old maize (Zea mays L.) plants of a 6 d non-lethal period of soil drying [soil water potential (SWP) decreased from -0.20 MPa to -0.81 MPa]. Root growth was initially stimulated during drying (when SWP decreased from -0.31 MPa to -0.38 MPa, compared with -0.29 MPa in well-watered pots), followed by inhibition during Days 5-6 (SWP from -0...
November 6, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29125673/overexpression-of-sdh-confers-tolerance-to-salt-and-osmotic-stress-but-decreases-aba-sensitivity-in-arabidopsis
#16
Xiao-Pu Shi, Jing-Jing Ren, Qin Yu, Shu-Mei Zhou, Qiu-Ping Ren, Lan-Jing Kong, Xiu-Ling Wang
Sorbitol dehydrogenase (SDH) catalyzes the reversible oxidation of sorbitol, xylitol and ribitol to their corresponding ketoses. In this study, we investigated the expression and role of Arabidopsis SDH in salt and osmotic stress tolerance, and abscisic acid (ABA) response. The expression patterns of SDH were investigated using transgenic Arabidopsis plants expressing beta-glucuronidase (GUS) under the control of promoter with the first intron of SDH. qRT-PCR and histochemical assay of GUS activity were used to study SDH expression regulation by ABA, salt and osmotic stress...
November 10, 2017: Plant Biology
https://www.readbyqxmd.com/read/29125669/the-role-of-arabidopsis-thaliana-rasd1-gene-in-aba-dependent-abiotic-stress-response
#17
Varvara Podia, Dimitra Milioni, Maria Martzikou, Kosmas Haralampidis
Abiotic stress is one of the key parameters affecting plant productivity. Drought and soil salinity, in particular, challenge the plants to activate various response mechanisms to withstand these adverse growth conditions. While the molecular events that take place are complex and to a large extent unclear, the plant hormone abscisic acid (ABA) is considered as a major player in mediating the adaptation of plants to stress. Here we report on the identification of an ABA insensitive mutant from Arabidopsis thaliana...
November 10, 2017: Plant Biology
https://www.readbyqxmd.com/read/29121866/the-roles-of-call-wall-invertase-inhibitor-in-regulating-chilling-tolerance-in-tomato
#18
Xiao-Xia Xu, Qin Hu, Wan-Nian Yang, Ye Jin
BACKGROUND: Hexoses are important metabolic signals that respond to abiotic and biotic stresses. Cold stress adversely affects plant growth and development, limiting productivity. The mechanism by which sugars regulate plant cold tolerance remains elusive. RESULTS: We examined the function of INVINH1, a cell wall invertase inhibitor, in tomato chilling tolerance. Cold stress suppressed the transcription of INVINH1 and increased that of cell wall invertase genes, Lin6 and Lin8 in tomato seedlings...
November 9, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/29121825/the-impact-of-staff-training-on-special-educational-needs-professionals-attitudes-toward-and-understanding-of-applied-behavior-analysis
#19
Sinéad Smyth, Benjamin E Reading, Claire McDowell
BACKGROUND: Research-based evidence points to the efficacy and value of applied behavior analysis (ABA) in meeting the needs of individuals with learning disabilities and autism. Nonetheless, public, government, and professional perception of ABA can be negative. The current study was designed to measure the impact of a short intervention on professionals' attitudes toward, and knowledge of, ABA. METHOD: Teachers and classroom assistants from two separate schools for children with severe learning difficulties completed a self-report survey on knowledge of and attitudes toward ABA...
January 1, 2017: Journal of Intellectual Disabilities: JOID
https://www.readbyqxmd.com/read/29121241/suppressing-type-2c-protein-phosphatases-alters-fruit-ripening-and-the-stress-response-in-tomato
#20
Yushu Zhang, Qian Li, Li Jiang, Wenbin Kai, Bin Liang, Juan Wang, Yangwei Du, Xiawan Zhai, Jieling Wang, Yingqi Zhang, Yufei Sun, Lusheng Zhang, Ping Leng
Although abscisic acid (ABA) signalling has been widely studied in Arabidopsis, the roles of core ABA signalling components in fruit remain poorly understood. Herein, we characterise SlPP2C1, a group A type 2C protein phosphatase that negatively regulates ABA signalling and fruit ripening in tomato. The SlPP2C1 protein was localised in the cytoplasm close to AtAHG3/AtPP2CA. The SlPP2C1 gene was expressed in all tomato tissues throughout development, particularly in flowers and fruits, and it was up-regulated by dehydration and ABA treatment...
November 7, 2017: Plant & Cell Physiology
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