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Drought tolerance

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https://www.readbyqxmd.com/read/29040752/expansion-of-the-dehydrin-gene-family-in-the-pinaceae-is-associated-with-considerable-structural-diversity-and-drought-responsive-expression
#1
Juliana Stival Sena, Isabelle Giguère, Philippe Rigault, Jean Bousquet, John Mackay
Temperatures are expected to increase over the next century in all terrestrial biomes and particularly in boreal forests, where drought-induced mortality has been predicted to rise. Genomics research is helping to develop hypotheses regarding the molecular basis of drought tolerance and recent work proposed that the osmo-protecting dehydrin proteins have undergone a clade-specific expansion in the Pinaceae, a major group of conifer trees. The objectives of this study were to identify all of the putative members of the gene family, trace their evolutionary origin, examine their structural diversity and test for drought-responsive expression...
October 13, 2017: Tree Physiology
https://www.readbyqxmd.com/read/29036462/drought-effects-on-root-and-needle-terpenoid-content-of-a-coastal-and-an-interior-douglas-fir-provenance
#2
Anita Kleiber, Qiuxiao Duan, Kirstin Jansen, Laura Verena Junker, Bernd Kammerer, Heinz Rennenberg, Ingo Ensminger, Arthur Gessler, Jürgen Kreuzwieser
Douglas fir (Pseudotsuga menziesii) is a conifer species that stores large amounts of terpenoids, mainly monoterpenoids in resin ducts of various tissues. The effects of drought on stored leaf terpenoid concentrations in trees are scarcely studied and published data are partially controversial, since reduced, unaffected or elevated terpenoid contents due to drought have been reported. Even less is known on the effect of drought on root terpenoids. In the present work, we investigated the effect of reduced water availability on the terpenoid content in roots and needles of Douglas fir seedlings...
September 19, 2017: Tree Physiology
https://www.readbyqxmd.com/read/29030640/insights-into-grapevine-defense-response-against-drought-as-revealed-by-biochemical-physiological-and-rna-seq-analysis
#3
Muhammad Salman Haider, Cheng Zhang, Mahantesh M Kurjogi, Tariq Pervaiz, Ting Zheng, Chaobo Zhang, Chen Lide, Lingfie Shangguan, Jinggui Fang
Grapevine is an important and extensively grown fruit crop, which is severely hampered by drought worldwide. So, comprehending the impact of drought on grapevine genetic resources is necessary. In the present study, RNA-sequencing was executed using cDNA libraries constructed from both drought-stress and control plants. Results generated 12,451 differentially expressed genes (DEGs), out of which 8,021 genes were up-regulated, and 4,430 were down-regulated. Further physiological and biochemical investigations were also performed to validate the biological processes associated with the development of grapevine in response to drought stress...
October 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29030481/antisense-transcription-represses-arabidopsis-seed-dormancy-qtl-dog1-to-regulate-drought-tolerance
#4
Ruslan Yatusevich, Halina Fedak, Arkadiusz Ciesielski, Katarzyna Krzyczmonik, Anna Kulik, Grazyna Dobrowolska, Szymon Swiezewski
Plants have developed multiple strategies to sense the external environment and to adapt growth accordingly. Delay of germination 1 (DOG1) is a major quantitative trait locus (QTL) for seed dormancy strength in Arabidopsis thaliana that is reported to be expressed exclusively in seeds. DOG1 is extensively regulated, with an antisense transcript (asDOG1) suppressing its expression in seeds. Here, we show that asDOG1 shows high levels in mature plants where it suppresses DOG1 expression under standard growth conditions...
October 13, 2017: EMBO Reports
https://www.readbyqxmd.com/read/29028613/divergent-biology-of-facultative-heavy-metal-plants
#5
REVIEW
Hermann Bothe, Aneta Słomka
Among heavy metal plants (the metallophytes), facultative species can live both in soils contaminated by an excess of heavy metals and in non-affected sites. In contrast, obligate metallophytes are restricted to polluted areas. Metallophytes offer a fascinating biology, due to the fact that species have developed different strategies to cope with the adverse conditions of heavy metal soils. The literature distinguishes between hyperaccumulating, accumulating, tolerant and excluding metallophytes, but the borderline between these categories is blurred...
September 7, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/29027842/wrky-transcription-factors-are-involved-in-brassinosteroid-signaling-and-mediate-the-crosstalk-between-plant-growth-and-drought-tolerance
#6
Jiani Chen, Yanhai Yin
Brassinosteroids (BRs) are critical for the plant growth and development. BRs signal through the plasma membrane localized receptor-like kinases to downstream transcription factors BES1/BZR1 to regulate the expression of thousands of genes for various BR responses. In addition to the role in plant growth and development, BRs have been implicated in responses to environmental stresses such as drought. However, the mechanism through which BRs regulate drought have just begun emerging. We have recently found that a group of WRKY transcription factors, WRKY46, WRKY54, WRKY70, which are well known for the function in abiotic and biotic stress, cooperates with BES1 to mediate BR-regulated drought response...
October 13, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/29027659/a-novel-cotton-wrky-gene-ghwrky6-like-improves-salt-tolerance-by-activating-the-aba-signalling-pathway-and-scavenging-of-reactive-oxygen-species
#7
Abid Ullah, Heng Sun, Hakim, Xiyan Yang, Xianlong Zhang
WRKY transcription factors are transcriptional regulators of signalling pathways involved in biotic and abiotic stress responses. In this study, we report that ectopic expression of the GhWRKY6-like gene significantly improved salt tolerance in Arabidopsis while silencing the GhWRKY6-like increase the sensitivity to abiotic stresses in cotton. GhWRKY6-like was localized to the nucleus. Expression of GhWRKY6-like was remarkably induced by salt, ethylene glycol (PEG) and abscisic acid (ABA) treatments. For further characterization, the GhWRKY6-like gene was cloned and transformed into Arabidopsis...
October 13, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/29024118/rice-sumo-protease-overly-tolerant-to-salt-1-targets-the-transcription-factor-osbzip23-to-promote-drought-tolerance-in-rice
#8
Anjil Kumar Srivastava, Cunjin Zhang, Robert S Caine, Julie Gray, Ari Sadanandom
Conjugation of SUMO (Small Ubiquitin-like Modifier) protein to cellular targets is emerging as a very influential protein modification system. Once covalently bound SUMO conjugation can change the stability or functionality of its cognate target proteins. SUMO protease can rapidly reverse SUMO conjugation making this modification system highly dynamic. A major factor in the variation of SUMO-target function is the balance between the conjugated/de-conjugated forms. The mechanistic role of these regulatory SUMO proteases in mediating stress responses has not been defined in any crops...
October 10, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/29023004/selection-of-drought-tolerant-maize-hybrids-using-path-coefficient-analysis-and-selection-index
#9
Abdalla Dao, Jacob Sanou, Edgar V S Traore, Vernon Gracen, Eric Y Danquah
BACKGROUND: In drought-prone environments, direct selection for yield is not adequate because of the variable environment and genotype x environment interaction. Therefore, the use of secondary traits in addition to yield has been suggested. The relative usefulness of secondary traits as indirect selection criteria for maize grain yield is determined by the magnitudes of their genetic variance, heritability and genetic correlation with the grain yield. MATERIALS AND METHODS: Forty eight testcross hybrids derived from lines with different genetic background and geographical origins plus 7 checks were evaluated in both well-watered and water-stressed conditions over two years for grain yield and secondary traits to determine the most appropriate secondary traits and select drought tolerant hybrids...
2017: Pakistan Journal of Biological Sciences: PJBS
https://www.readbyqxmd.com/read/29021803/uav-based-thermal-imaging-for-high-throughput-field-phenotyping-of-black-poplar-response-to-drought
#10
Riccardo Ludovisi, Flavia Tauro, Riccardo Salvati, Sacha Khoury, Giuseppe Mugnozza Scarascia, Antoine Harfouche
Poplars are fast-growing, high-yielding forest tree species, whose cultivation as second-generation biofuel crops is of increasing interest and can efficiently meet emission reduction goals. Yet, breeding elite poplar trees for drought resistance remains a major challenge. Worldwide breeding programs are largely focused on intra/interspecific hybridization, whereby Populus nigra L. is a fundamental parental pool. While high-throughput genotyping has resulted in unprecedented capabilities to rapidly decode complex genetic architecture of plant stress resistance, linking genomics to phenomics is hindered by technically challenging phenotyping...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29020945/dehydration-induced-transcriptomic-responses-in-two-tibetan-hulless-barley-hordeum-vulgare-var-nudum-accessions-distinguished-by-drought-tolerance
#11
Junjun Liang, Xin Chen, Guangbing Deng, Zhifen Pan, Haili Zhang, Qiao Li, Kaijun Yang, Hai Long, Maoqun Yu
BACKGROUND: The harsh environment on the Qinghai-Tibetan Plateau gives Tibetan hulless barley (Hordeum vulgare var. nudum) great ability to resist adversities such as drought, salinity, and low temperature, and makes it a good subject for the analysis of drought tolerance mechanism. To elucidate the specific gene networks and pathways that contribute to its drought tolerance, and for identifying new candidate genes for breeding purposes, we performed a transcriptomic analysis using two accessions of Tibetan hulless barley, namely Z772 (drought-tolerant) and Z013 (drought-sensitive)...
October 11, 2017: BMC Genomics
https://www.readbyqxmd.com/read/29018467/overexpression-of-slgras40-in-tomato-enhances-tolerance-to-abiotic-stresses-and-influences-auxin-and-gibberellin-signaling
#12
Yudong Liu, Wei Huang, Zhiqiang Xian, Nan Hu, Dongbo Lin, Hua Ren, Jingxuan Chen, Deding Su, Zhengguo Li
Abiotic stresses are major environmental factors that inhibit plant growth and development impacting crop productivity. GRAS transcription factors play critical and diverse roles in plant development and abiotic stress. In this study, SlGRAS40, a member of the tomato (Solanum lycopersicum) GRAS family, was functionally characterized. In wild-type (WT) tomato, SlGRAS40 was upregulated by abiotic stress induced by treatment with D-mannitol, NaCl, or H2O2. Transgenic tomato plants overexpressing SlGRAS40 (SlGRAS40-OE) were more tolerant of drought and salt stress than WT...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29018456/virtual-plants-need-water-too-functional-structural-root-system-models-in-the-context-of-drought-tolerance-breeding
#13
REVIEW
Adama Ndour, Vincent Vadez, Christophe Pradal, Mikaël Lucas
Developing a sustainable agricultural model is one of the great challenges of the coming years. The agricultural practices inherited from the Green Revolution of the 1960s show their limits today, and new paradigms need to be explored to counter rising issues such as the multiplication of climate-change related drought episodes. Two such new paradigms are the use of functional-structural plant models to complement and rationalize breeding approaches and a renewed focus on root systems as untapped sources of plant amelioration...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29016965/tapub1-a-putative-e3-ligase-gene-from-wheat-enhances-salt-stress-tolerance-in-transgenic-nicotiana-benthamiana
#14
Meng Zhang, Guang-Qiang Zhang, Han-Han Kang, Shu-Mei Zhou, Wei Wang
High salinity is one of the most severe environmental stresses and limits the growth and yield of diverse crop plants. We isolated a gene named TaPUB1 from wheat (Triticum aestivum L. cv HF9703) that encodes a novel protein containing a U-box domain, the precursor RNA processing 19p (Prp19) superfamily and WD-40 repeats. Real-time reverse transcription-PCR analysis showed that TaPUB1 transcript accumulation was up-regulated by high salinity, drought and phytohormones, suggesting that it plays a role in the abiotic-related defense response...
July 29, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29016956/chickpea-wrky70-regulates-the-expression-of-a-homeodomain-leucine-zipper-hd-zip-i-transcription-factor-cahdz12-which-confers-abiotic-stress-tolerance-in-transgenic-tobacco-and-chickpea
#15
Senjuti Sen, Joydeep Chakraborty, Prithwi Ghosh, Debabrata Basu, Sampa Das
Drought and salinity are the two major environmental constraints that severely affect global agricultural productivity. Plant-specific HD-Zip transcription factors are involved in plant growth, development and stress responses. In the present study, we explored the functional characteristics and regulation of a novel HD-Zip (I) gene from chickpea, CaHDZ12, in response to water-deficit and salt-stress conditions. Transgenic tobacco lines overexpressing CaHDZ12 exhibited improved tolerance to osmotic stresses and increased sensitivity to abscisic acid (ABA)...
September 11, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29016915/drought-tolerance-conferred-in-soybean-glycine-max-l-by-gmmyb84-a-novel-r2r3-myb-transcription-factor
#16
Nan Wang, Wenxiao Zhang, Mengyin Qin, Shuo Li, Meng Qiao, Zhenhua Liu, Fengning Xiang
MYB-type transcription factors (MYB TFs) play diverse roles in plant development and stress responses. However, the mechanisms underlying the actions of MYB TFs during stress response remain unclear. In this study we identified a R2R3-MYB TF in soybean (Glycine max), denoted GmMYB84, which contributes to drought resistance. Expression of GmMYB84 was induced by drought, salt stress, H2O2 and ABA. Compared with wild-type (WT), GmMYB84-overexpressing soybean mutants (OE lines) exhibited enhanced drought resistance with higher survival rate, longer primary root length, greater proline and reactive oxygen species (ROS) contents, higher antioxidant enzyme activities [peroxidase (POD), catalase (CAT), and superoxide dismutase (SOD)], a lower dehydration rate, and reduced malondialdehyde (MDA) content...
August 9, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28993863/long-term-water-table-monitoring-of-rio-grande-riparian-ecosystems-for-restoration-potential-amid-hydroclimatic-challenges
#17
James R Thibault, James R Cleverly, Clifford N Dahm
Hydrological processes drive the ecological functioning and sustainability of cottonwood-dominated riparian ecosystems in the arid southwestern USA. Snowmelt runoff elevates groundwater levels and inundates floodplains, which promotes cottonwood germination. Once established, these phreatophytes rely on accessible water tables (WTs). In New Mexico's Middle Rio Grande corridor diminished flooding and deepening WTs threaten native riparian communities. We monitored surface flows and riparian WTs for up to 14 years, which revealed that WTs and surface flows, including peak snowmelt discharge, respond to basin climate conditions and resource management...
October 9, 2017: Environmental Management
https://www.readbyqxmd.com/read/28993786/an-nam-domain-gene-ghnac79-improves-resistance-to-drought-stress-in-upland-cotton
#18
Yaning Guo, Chaoyou Pang, Xiaoyun Jia, Qifeng Ma, Lingling Dou, Fengli Zhao, Lijiao Gu, Hengling Wei, Hantao Wang, Shuli Fan, Junji Su, Shuxun Yu
Plant-specific NAC proteins comprise one of the largest transcription factor families in plants and play important roles in plant development and the stress response. Gossypium hirsutum L. is a major source of fiber, but its growth and productivity are limited by many biotic and abiotic stresses. In this study, the NAC domain gene GhNAC79 was functionally characterized in detail, and according to information about the cotton genome sequences, it was located on scaffold42.1, containing three exons and two introns...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28993661/metabolic-signatures-in-response-to-abscisic-acid-aba-treatment-in-brassica-napus-guard-cells-revealed-by-metabolomics
#19
Mengmeng Zhu, Sarah M Assmann
Drought can severely damage crops, resulting in major yield losses. During drought, vascular land plants conserve water via stomatal closure. Each stomate is bordered by a pair of guard cells that shrink in response to drought and the associated hormone abscisic acid (ABA). The activation of complex intracellular signaling networks underlies these responses. Therefore, analysis of guard cell metabolites is fundamental for elucidation of guard cell signaling pathways. Brassica napus is an important oilseed crop for human consumption and biodiesel production...
October 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28992130/stomatal-conductance-mesophyll-conductance-and-transpiration-efficiency-in-relation-to-leaf-anatomy-in-rice-and-wheat-genotypes-under-drought
#20
Wenjing Ouyang, Paul C Struik, Xinyou Yin, Jianchang Yang
Increasing leaf transpiration efficiency (TE) may provide leads for growing rice like dryland cereals such as wheat (Triticum aestivum). To explore avenues for improving TE in rice, variations in stomatal conductance (gs) and mesophyll conductance (gm) and their anatomical determinants were evaluated in two cultivars from each of lowland, aerobic, and upland groups of Oryza sativa, one cultivar of O. glaberrima, and two cultivars of T. aestivum, under three water regimes. The TE of upland rice, O. glaberrima, and wheat was more responsive to the gm/gs ratio than that of lowland and aerobic rice...
September 15, 2017: Journal of Experimental Botany
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