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"abscisic acid"

Caiyun He, Guori Gao, Jianguo Zhang, Aiguo Duan, Hongmei Luo
BACKGROUND: Low temperature is one of the crucial environmental factors limiting the productivity and distribution of plants. Sea buckthorn (Hippophae rhamnoides L.), a well recognized multipurpose plant species, live successfully in in cold desert regions. But their molecular mechanisms underlying cold tolerance are not well understood. METHODS: Physiological and biochemical responses to low-temperature stress were studied in seedlings of sea buckthorn. Differentially expressed protein spots were analyzed using multiplexing fluorescent two-dimensional fluorescence difference gel electrophoresis (2D-DIGE) coupled with matrix-assisted laser desorption/ionization (MALDI) time-of-flight/time-of-flight (TOF/TOF) mass spectrometry (MS), the concentration of phytohormone was measured using enzyme-linked immunosorbent assay, and a spectrophotometric assay was used to measure enzymatic reactions...
2016: Proteome Science
Cameron S Gordon, Nandhakishore Rajagopalan, Eddy P Risseeuw, Marci Surpin, Fraser J Ball, Carla J Barber, Leann M Buhrow, Shawn M Clark, Jonathan E Page, Chris D Todd, Suzanne R Abrams, Michele C Loewen
Abscisic acid (ABA) is a well-characterized plant hormone, known to mediate developmental aspects as well as both abiotic and biotic stress responses. Notably, the exogenous application of ABA has recently been shown to increase susceptibility to the fungal pathogen Fusarium graminearum, the causative agent of Fusarium head blight (FHB) in wheat and other cereals. However roles and mechanisms associated with ABA's modulation of pathogen responses remain enigmatic. Here the identification of putative ABA receptors from available genomic databases for Triticum aestivum (bread wheat) and Brachypodium distachyon (a model cereal) are reported...
2016: PloS One
Yan-Lun Ju, Min Liu, Hui Zhao, Jiang-Fei Meng, Yu-Lin Fang
The anthocyanin composition, fatty acids, and volatile aromas are important for Cabernet Sauvignon grape quality. This study evaluated the effect of exogenous abscisic acid (ABA) and methyl jasmonate (MeJA) on the anthocyanin composition, fatty acids, lipoxygenase activity, and the volatile compounds of Cabernet Sauvignon grape berries. Exogenous ABA and MeJA improved the content of total anthocyanins (TAC) and individual anthocyanins. Lipoxygenase (LOX) activity also increased after treatment. Furthermore, 16 fatty acids were detected...
October 12, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Julio A Massange-Sánchez, Paola A Palmeros-Suárez, Eduardo Espitia-Rangel, Isaac Rodríguez-Arévalo, Lino Sánchez-Segura, Norma A Martínez-Gallardo, Fulgencio Alatorre-Cobos, Axel Tiessen, John P Délano-Frier
Two grain amaranth transcription factor (TF) genes were overexpressed in Arabidopsis plants. The first, coding for a group VII ethylene response factor TF (i.e., AhERF-VII) conferred tolerance to water-deficit stress (WS) in transgenic Arabidopsis without affecting vegetative or reproductive growth. A significantly lower water-loss rate in detached leaves coupled to a reduced stomatal opening in leaves of plants subjected to WS was associated with this trait. WS tolerance was also associated with an increased antioxidant enzyme activity and the accumulation of putative stress-related secondary metabolites...
2016: PloS One
Jingxue Wang, Sanjay K Singh, Chunfang Du, Chen Li, Jianchun Fan, Sitakanta Pattanaik, Ling Yuan
Rapeseed (Brassica napus) is an important oil seed crop, providing more than 13% of the world's supply of edible oils. An in-depth knowledge of the gene network involved in biosynthesis and accumulation of seed oil is critical for the improvement of B. napus. Using available genomic and transcriptomic resources, we identified 1,750 acyl-lipid metabolism (ALM) genes that are distributed over 19 chromosomes in the B. napus genome. B. rapa and B. oleracea, two diploid progenitors of B. napus, contributed almost equally to the ALM genes...
2016: Frontiers in Plant Science
Sheng Shu, Pan Gao, Lin Li, Yinghui Yuan, Jin Sun, Shirong Guo
With the aim to clarifying the role of the ABA/H2O2 signaling cascade in the regulating the antioxidant capacity of grafted cucumber plants in response to Ca(NO3)2 stress, we investigated the relationship between ABA-mediated H2O2 production and the activities of antioxidant enzymes in the leaves of pumpkin-grafted cucumber seedlings. The results showed that both ABA and H2O2 were detected in pumpkin-grafted cucumber seedlings in response to Ca(NO3)2 treatment within 0.5 h in the leaves and peaked at 3 and 6 h after Ca(NO3)2 treatment, respectively, compared to the levels under control conditions...
2016: Frontiers in Plant Science
Maoulida Toueni, Cécile Ben, Aurélie Le Ru, Laurent Gentzbittel, Martina Rickauer
Resistance mechanisms to Verticillium wilt are well-studied in tomato, cotton, and Arabidopsis, but much less in legume plants. Because legume plants establish nitrogen-fixing symbioses in their roots, resistance to root-attacking pathogens merits particular attention. The interaction between the soil-borne pathogen Verticillium alfalfae and the model legume Medicago truncatula was investigated using a resistant (A17) and a susceptible (F83005.5) line. As shown by histological analyses, colonization by the pathogen was initiated similarly in both lines...
2016: Frontiers in Plant Science
Jong Youn Kim, Dong Hwi Kim, Young Chang Kim, Kee Hong Kim, Jung Yeon Han, Yong Eui Choi
BACKGROUND: The low survival rate of in vitro regenerated Panax ginseng plantlets after transfer to soil is the main obstacle for their successful micropropagation and molecular breeding. In most cases, young plantlets converted from somatic embryos are transferred to soil. METHODS: In vitro thickened taproots, which were produced after prolonged culture of ginseng plantlets, were transferred to soil. RESULTS: Taproot thickening of plantlets occurred near hypocotyl and primary roots...
October 2016: Journal of Ginseng Research
Berta Gallego, Soledad Martos, Catalina Cabot, Juan Barceló, Charlotte Poschenrieder
The hypothesis of metal defense as a substitute for a defective biotic stress signaling system in metal hyperaccumulators was tested using the pathosystem Alternaria brassicicola - Noccaea caerulescens under low (2 μM), medium (12 μM), and high (102 μM) Zn supply. Regardless the Zn supply, N. caerulescens responded to fungal attack with the activation of both HMA4 coding for a Zn transporter, and biotic stress signaling pathways. Salicylate, jasmonate, abscisic acid, and indoleacetic acid concentrations, as well as biotic stress marker genes (PDF1...
October 13, 2016: Physiologia Plantarum
Hongju Jian, Kun Lu, Bo Yang, Tengyue Wang, Li Zhang, Aoxiang Zhang, Jia Wang, Liezhao Liu, Cunmin Qu, Jiana Li
Sucrose is the principal transported product of photosynthesis from source leaves to sink organs. SUTs/SUCs (sucrose transporters or sucrose carriers) and SWEETs (Sugars Will Eventually be Exported Transporters) play significant central roles in phloem loading and unloading. SUTs/SUCs and SWEETs are key players in sucrose translocation and are associated with crop yields. The SUT/SUC and SWEET genes have been characterized in several plant species, but a comprehensive analysis of these two gene families in oilseed rape has not yet been reported...
2016: Frontiers in Plant Science
Matteo Riboni, Alice Robustelli Test, Massimo Galbiati, Chiara Tonelli, Lucio Conti
One strategy deployed by plants to endure water scarcity is to accelerate the transition to flowering adaptively via the drought escape (DE) response. In Arabidopsis thaliana, activation of the DE response requires the photoperiodic response gene GIGANTEA (GI) and the florigen genes FLOWERING LOCUS T (FT) and TWIN SISTER OF FT (TSF). The phytohormone abscisic acid (ABA) is also required for the DE response, by promoting the transcriptional up-regulation of the florigen genes. The mode of interaction between ABA and the photoperiodic genes remains obscure...
October 12, 2016: Journal of Experimental Botany
Yachun Su, Liping Xu, Zhuqing Wang, Qiong Peng, Yuting Yang, Yun Chen, Youxiong Que
BACKGROUND: Sugarcane smut, which is caused by Sporisorium scitamineum, has been threatening global sugarcane production. Breeding smut resistant sugarcane varieties has been proven to be the most effective method of controlling this particular disease. However, a lack of genome information of sugarcane has hindered the development of genome-assisted resistance breeding programs. Furthermore, the molecular basis of sugarcane response to S. scitamineum infection at the proteome level was incomplete and combining proteomic and transcriptional analysis has not yet been conducted...
October 12, 2016: BMC Genomics
Dawei Yan, Vanathy Easwaran, Vivian Chau, Masanori Okamoto, Matthew Ierullo, Mitsuhiro Kimura, Akira Endo, Ryoichi Yano, Asher Pasha, Yunchen Gong, Yong-Mei Bi, Nicolas Provart, David Guttman, Anne Krapp, Steven J Rothstein, Eiji Nambara
Seeds respond to multiple different environmental stimuli that regulate germination. Nitrate stimulates germination in many plants but how it does so remains unclear. Here we show that the Arabidopsis NIN-like protein 8 (NLP8) is essential for nitrate-promoted seed germination. Seed germination in nlp8 loss-of-function mutants does not respond to nitrate. NLP8 functions even in a nitrate reductase-deficient mutant background, and the requirement for NLP8 is conserved among Arabidopsis accessions. NLP8 reduces abscisic acid levels in a nitrate-dependent manner and directly binds to the promoter of CYP707A2, encoding an abscisic acid catabolic enzyme...
October 12, 2016: Nature Communications
Ilaria Forieri, Carsten Sticht, Michael Reichelt, Norbert Gretz, Malcolm J Hawkesford, Mario Malagoli, Markus Wirtz, Ruediger Hell
Deprivation of mineral nutrients causes significant retardation of plant growth. This retardation is associated with nutrient specific and general stress-induced transcriptional responses. In this study we adjusted the external supply of iron, potassium and sulfur to cause the same retardation of shoot growth. Nevertheless, limitation by individual nutrients resulted in specific morphological adaptations and distinct shifts within the root metabolite fingerprint. The metabolic shifts affected key metabolites of primary metabolism and the stress-related phytohormones, jasmonic-, salicylic- and abscisic acid...
October 10, 2016: Plant, Cell & Environment
Zhi Wang, Guoxia Su, Min Li, Qingbo Ke, Soo Young Kim, Hongbing Li, Jin Huang, Bingcheng Xu, Xi-Ping Deng, Sang-Soo Kwak
Arabidopsis ABSCISIC ACID-RESPONSIVE ELEMENT-BINDING FACTOR 3 (ABF3), a bZIP transcription factor, plays an important role in regulating multiple stress responses in plants. Overexpressing AtABF3 increases tolerance to various stresses in several plant species. Alfalfa (Medicago sativa L.), one of the most important perennial forage crops worldwide, has high yields, high nutritional value, and good palatability and is widely distributed in irrigated and semi-arid regions throughout the world. However, drought and salt stress pose major constraints to alfalfa production...
October 1, 2016: Plant Physiology and Biochemistry: PPB
Shi-Shuai Luo, Yan-Ni Sun, Xue Zhou, Tong Zhu, Li-Sha Zhu, Muhammad Arfan, Li-Juan Zou, Hong-Hui Lin
Drought is one of the most significant abiotic stresses that restrict crop productivity. Medicago truncatula is a model legume species with a wide genetic diversity. We compared the differential physiological and molecular changes of two genotypes of M. truncatula (Jemalong A17 and R108) in response to progressive drought stress and rewatering. The MtNCED and MtZEP activation and higher abscisic acid (ABA) content was observed in Jemalong A17 plants under normal conditions. Additionally, a greater increase in ABA content and expression of MtNCED and MtZEP in Jemalong A17 plants than that of R108 plants were observed under drought conditions...
October 1, 2016: Plant Physiology and Biochemistry: PPB
Bárbara Castro Vieira, Elisa Monteze Bicalho, Sergi Munné-Bosch, Queila Souza Garcia
The relationship between the phytohormones, gibberellin (GA) and abscisic acid (ABA) and light and temperature on seed germination is still not well understood. Here, we investigated the interaction between light, temperature, ABA and GA in seed germination of Vellozia caruncularis, V. intermedia, and V. alutacea. Seeds were incubated in 100 μM solutions of GA (GA3 or GA4 ), ABA and their respective biosynthesis inhibitors (paclobutrazol - PAC, and fluridone - FLU) at two temperatures (25 and 40 °C). Furthermore, endogenous concentrations of active gibberellins (GAs), including GA1 , GA3 and GA4 , and those of ABA were measured in seeds of V...
October 8, 2016: Plant Biology
Xiang He, Lihua Li, Hong Xu, Jiang Xi, Xufeng Cao, Haoran Xu, Songhao Rong, Yilun Dong, Chuan Wang, Rongjun Chen, Jinghong Xu, Xiaoling Gao, Zhengjun Xu
Abiotic stresses have a significant impact on plant productivity and crop quality. Although plant lectins are thought to play important roles in plant defense signaling during pathogen attack, little is known about the contribution of plant lectins to stress resistance. We cloned and functionally characterized a rice jacalin-related mannose-binding lectin gene, OsJRL, from rice 'Nipponbare'. The cDNA of OsJRL contained a 438 bp open reading frame, which encodes a polypeptide of 145 amino acids. OsJRL was localized in the nucleus and cytoplasm...
October 8, 2016: Plant Biology
Dan Yu, Fangfang Bu, Jiaojiao Hou, Yongxiang Kang, Zhongdong Yu
A post-fire morel collected from Populus simonii stands in Mt. Qingling was identified as Morchella crassipes Mes-20 by using nuclear ribosomal DNA internal transcribed spacer phylogeny. It was inoculated into sweet corn to observe colonized roots in purified culture and in greenhouse experiments. The elongation and maturation zones of sweet corn were remarkably colonized at the cortex intercellular and intracellular cells, vessel cells, and around the Casparian strip, forming ectendomycorrhiza-like structures...
December 2016: World Journal of Microbiology & Biotechnology
Xiaoming Li, Huipei Han, Ming Chen, Wei Yang, Li Liu, Ning Li, Xinhua Ding, Zhaohui Chu
Short-chain peptides play important roles in plant development and responses to abiotic and biotic stresses. Here, we characterized a gene of unknown function termed OsDT11, which encodes an 88 amino acid short-chain peptide and belongs to the cysteine-rich peptide family. It was found that the expression of OsDT11 can be activated by polyethylene glycol (PEG) treatment. Compared with wild-type lines, the OsDT11-overexpression lines displayed dramatically enhanced tolerance to drought and had reduced water loss, reduced stomatal density, and an increased the concentration of abscisic acid (ABA)...
October 7, 2016: Plant Molecular Biology
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