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https://www.readbyqxmd.com/read/29332275/impact-of-drought-stress-induced-by-polyethylene-glycol-on-growth-water-relations-and-cell-viability-of-norway-spruce-seedlings
#1
Ilya E Zlobin, Yury V Ivanov, Alexander V Kartashov, Vladimir V Kuznetsov
We investigated physiological responses of 7-week-old Norway spruce seedlings to water deficits of different intensities. Hydroponically grown seedlings were subjected to mild (-0.15 MPa), strong (-0.5 and -1.0 MPa) and extreme (-1.5 MPa) water deficit induced by polyethylene glycol 6000, and their growth parameters, water status and physiological activity were analyzed. Seedlings effectively restricted water loss under drought, and even under extreme water deficit, shoot relative water content did not fall below 85%...
January 5, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29331925/overexpression-of-chrysanthemum-lavandulifolium-clcbf1-in-chrysanthemum-morifolium-white-snow-improves-the-level-of-salinity-and-drought-tolerance
#2
Wenjie Gao, Miao He, Jie Liu, Xin Ma, Yu Zhang, Silan Dai, Yunwei Zhou
This paper reports the first study on plant CBF transcription factors (TF) in salt and drought stress responses in Chrysanthemum lavandulifolium. A CBF homolog gene, named as ClCBF1, from C. lavandulifolium was isolated using rapid amplification of cDNA ends (RACE). The deduced peptide is comprised of 210 amino acids (AA) containing an AP2 structural domain characteristic of the AP2 gene family. Quantitative real-time PCR revealed that ClCBF1 gene exhibit differential expression patterns across root, leaf and stem tissues, and it was strongly induced under salt and drought treatments of C...
January 8, 2018: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/29331610/pseudomonas-putida-modulates-the-expression-of-mirnas-and-their-target-genes-in-response-to-drought-and-salt-stresses-in-chickpea-cicer-arietinum-l
#3
Ram Jatan, Puneet Singh Chauhan, Charu Lata
MicroRNAs are small non-coding regulatory RNA molecules that play an important role in the modulation of gene expression during various environmental stresses. Pseudomonas putida RA, a plant growth promoting rhizobacteria (PGPR) colonizes the root surface of plants improving their growth and development during abiotic stresses modulating the expression of stress-responsive genes; however, the impact of RA on stress responsive-miRNA remains elusive. The present study was an attempt to delineate the role of PGPR in modulating stress responsive-miRNAs in a tolerant desi chickpea genotype exposed to drought and salt stresses...
January 10, 2018: Genomics
https://www.readbyqxmd.com/read/29330772/rice-wrky11-plays-a-role-in-pathogen-defense-and-drought-tolerance
#4
Heyoung Lee, Jooyoung Cha, Changhyun Choi, Naeyoung Choi, Hyun-So Ji, Sang Ryeol Park, Seungbum Lee, Duk-Ju Hwang
BACKGROUND: Plants are frequently subjected to abiotic and biotic stresses, and WRKY proteins play a pivotal role in the response to such stress. OsWRKY11 is induced by pathogens, drought, and heat, suggesting a function in biotic and abiotic stress responses. RESULTS: This study identified OsWRKY11, a member of WRKY group IIc. It is a transcriptional activator that localized to the nucleus. Ectopic expression of OsWRKY11 resulted in enhanced resistance to a bacterial pathogen, Xanthomonas oryzae pv...
January 12, 2018: Rice
https://www.readbyqxmd.com/read/29330721/transcriptomic-analysis-and-discovery-of-genes-in-the-response-of-arachis-hypogaea-to-drought-stress
#5
Xiaobo Zhao, Chunjuan Li, Shubo Wan, Tingting Zhang, Caixia Yan, Shihua Shan
The peanut (Arachis hypogaea) is an important crop species that is threatened by drought stress. The genome sequences of peanut, which was officially released in 2016, may help explain the molecular mechanisms that underlie drought tolerance in this species. We report here a gene expression profiling of A. hypogaea to gain a global view of its drought resistance. Using whole-transcriptome sequencing, we analysed differential gene expression in response to drought stress in the drought-resistant peanut cultivar J11...
January 12, 2018: Molecular Biology Reports
https://www.readbyqxmd.com/read/29330479/titania-tio2-nanoparticles-enhance-the-performance-of-growth-promoting-rhizobacteria
#6
Salme Timmusk, Gulaim Seisenbaeva, Lawrence Behers
A novel use of nanotitania (TNs) as agents in the nanointerface interaction between plants and colonization of growth promoting rhizobacteria (PGPR) is presented. The effectiveness of PGPRs is related to the effectiveness of the technology used for their formulation. TNs produced by the Captigel patented SolGel approach, characterized by the transmission and scanning electron microscopy were used for formulation of the harsh environment PGPR strains. Changes in the biomass of wheat seedlings and in the density of single and double inoculants with and without TNs were monitored during two weeks of stress induced by drought salt and by the pathogen Fusarium culmorum...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29329517/genome-wide-analyses-of-direct-target-genes-of-four-rice-nac-domain-transcription-factors-involved-in-drought-tolerance
#7
Pil Joong Chung, Harin Jung, Yang Do Choi, Ju-Kon Kim
BACKGROUND: Plant stress responses and mechanisms determining tolerance are controlled by diverse sets of genes. Transcription factors (TFs) have been implicated in conferring drought tolerance under drought stress conditions, and the identification of their target genes can elucidate molecular regulatory networks that orchestrate tolerance mechanisms. RESULTS: We generated transgenic rice plants overexpressing the 4 rice TFs, OsNAC5, 6, 9, and 10, under the control of the root-specific RCc3 promoter...
January 12, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29329458/three-fatty-acyl-coenzyme-a-reductases-bdfar1-bdfar2-and-bdfar3-are-involved-in-primary-alcohols-biosynthesis-of-cuticular-wax-in-brachypodium-distachyon
#8
Yong Wang, Yulin Sun, Qiuye You, Wenqiao Luo, Cong Wang, Shuai Zhao, Guaiqiang Chai, Tingting Li, Xue Shi, Chunlian Li, Reinhard Jetter, Zhonghua Wang
Plant cuticular wax is a heterogeneous mixture of very-long-chain fatty acids (VLCFAs) and their derivatives. Primary alcohols are the dominant wax components throughout leaf development of Brachypodium distachyon (Brachypodium). However, the genes involved in primary alcohols biosynthesis have not been investigated and their exact biological function remains currently unclear in Brachypodium to date. Here, we monitored the leaf wax profile and crystal morphology during Brachypodium leaf morphogenesis, and isolated three Brachypodium fatty acyl-CoA reductase (FAR) genes, named BdFAR1, BdFAR2 and BdFAR3, then analyzed their biochemical activities, substrate specificities, expression patterns, subcellular localization, and stress induction...
January 9, 2018: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29327440/a-maize-phytochrome-interacting-factors-protein-zmpif1-enhances-drought-tolerance-by-inducing-stomatal-closure-and-improves-grain-yield-in-oryza-sativa
#9
Yong Gao, Meiqin Wu, Mengjiao Zhang, Wei Jiang, Xiaoyun Ren, Enxing Liang, Dongping Zhang, Changquan Zhang, Ning Xiao, Yan Li, Yi Dai, Jianmin Chen
Phytochrome-interacting factors (PIFs) play major roles in regulating plant growth and development, but their roles in drought stress remain elusive. Here, we cloned and characterized a maize (Zea mays) PIF transcription factor, ZmPIF1. The expression level of ZmPIF1 was significantly induced by independent drought and abscisic acid (ABA) treatments. The ZmPIF1 transgenic rice and Arabidopsis displayed water-saving and drought-resistance, which were associated with reduced a stomatal aperture and transpiration rate...
January 11, 2018: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/29327304/the-irrigation-effect-how-river-regulation-can-promote-some-riparian-vegetation
#10
Karen M Gill, Lori A Goater, Jeffrey H Braatne, Stewart B Rood
River regulation impacts riparian ecosystems by altering the hydrogeomorphic conditions that support streamside vegetation. Obligate riparian plants are often negatively impacted since they are ecological specialists with particular instream flow requirements. Conversely, facultative riparian plants are generalists and may be less vulnerable to river regulation, and could benefit from augmented flows that reduce drought stress during hot and dry periods. To consider this 'irrigation effect' we studied the facultative shrub, netleaf hackberry (Celtis reticulata), the predominant riparian plant along the Hells Canyon corridor of the Snake River, Idaho, USA, where dams produce hydropeaking, diurnal flow variation...
January 11, 2018: Environmental Management
https://www.readbyqxmd.com/read/29327227/structural-characterization-of-a-novel-full-length-transcript-promoter-from-horseradish-latent-virus-hrlv-and-its-transcriptional-regulation-by-multiple-stress-responsive-transcription-factors
#11
Ahamed Khan, Ankita Shrestha, Kashyap Bhuyan, Indu B Maiti, Nrisingha Dey
The promoter fragment described in this study can be employed for strong transgene expression under both biotic and abiotic stress conditions. Plant-infecting Caulimoviruses have evolved multiple regulatory mechanisms to address various environmental stimuli during the course of evolution. One such mechanism involves the retention of discrete stress responsive cis-elements which are required for their survival and host-specificity. Here we describe the characterization of a novel Caulimoviral promoter isolated from Horseradish Latent Virus (HRLV) and its regulation by multiple stress responsive Transcription factors (TFs) namely DREB1, AREB1 and TGA1a...
January 11, 2018: Plant Molecular Biology
https://www.readbyqxmd.com/read/29325114/distribution-of-pines-in-the-iberian-peninsula-agrees-with-species-differences-in-foliage-frost-tolerance-not-with-vulnerability-to-freezing-induced-xylem-embolism
#12
Laura Fernández-Pérez, Pedro Villar-Salvador, Jordi Martínez-Vilalta, Andrei Toca, Miguel A Zavala
Drought and frosts are major determinants of plant functioning and distribution. Both stresses can cause xylem embolism and foliage damage. The objective of this study was to analyse if the distribution of six common pine species along latitudinal and altitudinal gradients in Europe is related to their interspecific differences in frost tolerance and to the physiological mechanisms underlying species-specific frost tolerance. We also evaluate if frost tolerance depends on plant water status. We studied survival to a range of freezing temperatures in 2-year-old plants and assessed the percentage loss of hydraulic conductivity (PLC) due xylem embolism formation and foliage damage determined by needle electrolyte leakage (EL) after a single frost cycle to -15 °C and over a range of predawn water potential (ψpd) values...
January 9, 2018: Tree Physiology
https://www.readbyqxmd.com/read/29325054/dehydration-survival-of-crop-plants-and-its-measurement
#13
Abraham Blum, Roberto Tuberosa
Dehydration survival under drought stress is defined in this review as the transition from plant activity into a quiescent state of life preservation, which will be terminated by either recovery or death, depending on the stress regime and the plant's resilience. Dehydration survival is a popular phenotype by which functional genomics attempts to test gene function in drought resistance and survival. The available reports on phenotyping and genotyping of dehydration survival in genomic studies indicate that the measurement of this trait is often biased to the extent that misguided interpretations are likely to occur...
January 8, 2018: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29323767/high-land-use-intensity-exacerbates-shifts-in-grassland-vegetation-composition-after-severe-experimental-drought
#14
Andreas Stampfli, Juliette M G Bloor, Markus Fischer, Michaela Zeiter
Climate change projections anticipate increased frequency and intensity of drought stress but grassland responses to severe droughts and their potential to recover are poorly understood. In many grasslands, high land-use intensity has enhanced productivity and promoted resource-acquisitive species at the expense of resource-conservative ones. Such changes in plant functional composition could affect the resistance to drought and the recovery after drought of grassland ecosystems with consequences for feed productivity resilience and environmental stewardship...
January 11, 2018: Global Change Biology
https://www.readbyqxmd.com/read/29322590/cocoa-agroforestry-is-less-resilient-to-sub-optimal-and-extreme-climate-than-cocoa-in-full-sun-reply-to-norgrove-2017
#15
Issaka Abdulai, Philippe Vaast, Munir P Hoffmann, Richard Asare, Laurence Jassogne, Piet Van Asten, Reimund P Rötter, Sophie Graefe
The critique of Norgrove, (2017) addresses two main points, which are discussed below (i) Resilience of cocoa agroforestry versus full sun under extreme climatic conditions In our study we covered extreme climatic events, a heat-wave combined with a severe dry season lasting longer than usual and killing cocoa trees under shade. These climatic conditions were not only observed at our study plots, but also in the larger cocoa cultivation region (Fig 1). In line with our observations, "certain cocoa cooperatives in Ivory Coast reported that shade trees in their cocoa fields accentuated the drought stress during the 2015 drought event" (1 Andrew Broosk, pers comm)...
January 11, 2018: Global Change Biology
https://www.readbyqxmd.com/read/29321907/the-groot-effect-plant-facilitation-and-desert-shrub-regrowth-following-extensive-damage
#16
Christopher J Lortie, Eva Gruber, Alex Filazzola, Taylor Noble, Michael Westphal
Deserts are increasing in extent globally, but existing deserts are decreasing in health. The basic biology and ecology of foundation plant species in deserts are limited. This is a direct study that provides an estimate of the capacity for a locally dominant foundation shrub species in California to recover from damage. Desert shrubs are cleared and damaged by humans for many purposes including agriculture, oil and gas production, and sustainable energy developments; we need to know whether foundation species consistently facilitate the abundance and diversity of other plants in high-stress ecosystems and whether they can recover...
January 2018: Ecology and Evolution
https://www.readbyqxmd.com/read/29321617/alleviation-of-drought-stress-in-phyllostachys-edulis-by-n-and-p-application
#17
Zhi Zhuang Wu, Ye Qing Ying, Yuan Bin Zhang, Yu Fang Bi, An Ke Wang, Xu Hua Du
The aim of this study was to explore whether nutrition supply can improve the drought tolerance of Moso bamboo under dry conditions. One-year-old seedlings were exposed to two soil water content levels [wellwatered, 70 ± 5% soil-relative-water-content (SRWC) and drought stress, 30 ± 5% SRWC] and four combinations of nitrogen (N) and phosphorus (P) supply (low-N, low-P, LNLP; low-N, high-P, LNHP; high-N, high-P, HNHP; and high-N, low-P, HNLP) for four months. Plant growth, photosynthesis, chlorophyll fluorescence, water use efficiency and cell membrane stability were determined...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29320982/global-identification-structural-analysis-and-expression-characterization-of-cytochrome-p450-monooxygenase-superfamily-in-rice
#18
Kaifa Wei, Huiqin Chen
BACKGROUND: The cytochrome P450 monooxygenases (CYP450, CYP, P450) catalyze numerous monooxygenation/hydroxylation reactions in biochemical pathways. Although CYP superfamily has been systematically studied in a few species, the genome-scale research about it in rice has not been done. RESULTS: In this study, a total of 355 CYPs encoded by 326 genes were identified in japonica genome. The OsCYP genes are classified into 10 clans including 45 families according to phylogenetic analysis...
January 10, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29316727/cloning-and-functional-analysis-of-phosphoethanolamine-methyltransferase-promoter-from-maize-zea-mays-l
#19
Gai-Li Niu, Wei Gou, Xiang-Long Han, Cheng Qin, Li-Xin Zhang, Abd El-Fatah Abomohra, Muhammad Ashraf
Betaine, a non-toxic osmoprotectant, is believed to accumulate considerably in plants under stress conditions to maintain the osmotic pressure and promote a variety of processes involved in growth and development. Phosphoethanolamine N-methyltransferase (PEAMT), a key enzyme for betaine synthesis, is reported to be regulated by its upstream promoter. In the present investigation, by using the transgenic approach, a 1048 bp long promoter region of ZmPEAMT gene from Zea mays was cloned and functionally characterized in tobacco...
January 8, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29315745/aspergillus-niger-mutants-affected-in-conidial-pigmentation-do-not-have-an-increased-susceptibility-to-water-stress-during-growth-at-low-water-activity
#20
Frank J J Segers, Han A B Wösten, Jan Dijksterhuis
Aspergillus niger forms conidia that contain melanin in their cell wall. This black pigment has been shown to protect fungi against UV-radiation and experimental evidence has indicated that it also protects against drought and high salt concentrations. In this study, growth of A. niger was evaluated at low water activity (aw ) and after changes in relative humidity (RH). In addition, deletion strains of A. niger affected in the melanin synthesis pathway were compared. Germination of conidia of the wild-type and deletion strains was observed at 0...
January 8, 2018: Letters in Applied Microbiology
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