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https://www.readbyqxmd.com/read/28622918/angiosperm-plant-desiccation-tolerance-hints-from-transcriptomics-and-genome-sequencing
#1
REVIEW
Valentino Giarola, Quancan Hou, Dorothea Bartels
Desiccation tolerance (DT) in angiosperms is present in the small group of resurrection plants and in seeds. DT requires the presence of protective proteins, specific carbohydrates, restructuring of membrane lipids, and regulatory mechanisms directing a dedicated gene expression program. Many components are common to resurrection plants and seeds; however, some are specific for resurrection plants. Understanding how each component contributes to DT is challenging. Recent transcriptome analyses and genome sequencing indicate that increased expression is essential of genes encoding protective components, recently evolved, species-specific genes and non-protein-coding RNAs...
June 13, 2017: Trends in Plant Science
https://www.readbyqxmd.com/read/28494872/using-resurrected-ancestral-proviral-proteins-to-engineer-virus-resistance
#2
Asunción Delgado, Rocio Arco, Beatriz Ibarra-Molero, Jose M Sanchez-Ruiz
Proviral factors are host proteins hijacked by viruses for processes essential for virus propagation such as cellular entry and replication. Pathogens and their hosts co-evolve. It follows that replacing a proviral factor with a functional ancestral form of the same protein could prevent viral propagation without fatally compromising organismal fitness. Here, we provide proof of concept of this notion. Thioredoxins serve as general oxidoreductases in all known cells. We report that several laboratory resurrections of Precambrian thioredoxins display substantial levels of functionality within Escherichia coli...
May 9, 2017: Cell Reports
https://www.readbyqxmd.com/read/28466470/an-osmotin-from-the-resurrection-plant-tripogon-loliiformis-tlosm-confers-tolerance-to-multiple-abiotic-stresses-in-transgenic-rice
#3
Thi Thuy Trang Le, Brett Williams, Sagadevan Mundree
Osmotin is a key protein associated with abiotic and biotic stress response in plants. In this study, an osmotin from the resurrection plant Tripogon loliiformis (TlOsm) was characterized and functionally analyzed under abiotic stress conditions in T. loliiformis as well as in transgenic Nicotiana tabacum (tobacco) and Oryza sativa (rice) plants. Real-time PCR analysis on mixed elicitor cDNA libraries from T. loliiformis showed that TlOsm was upregulated a thousand-fold during the early stages of osmotic stresses (cold, drought, and salinity) in both shoots and roots but down-regulated in shoots during heat stress...
May 3, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28351347/sporobolus-stapfianus-insights-into-desiccation-tolerance-in-the-resurrection-grasses-from-linking-transcriptomics-to-metabolomics
#4
Abou Yobi, Karen A Schlauch, Richard L Tillett, Won C Yim, Catherine Espinoza, Bernard W M Wone, John C Cushman, Melvin J Oliver
BACKGROUND: Understanding the response of resurrection angiosperms to dehydration and rehydration is critical for deciphering the mechanisms of how plants cope with the rigors of water loss from their vegetative tissues. We have focused our studies on the C4 resurrection grass, Sporobolus stapfianus Gandoger, as a member of a group of important forage grasses. METHODS: We have combined non-targeted metabolomics with transcriptomics, via a NimbleGen array platform, to develop an understanding of how gene expression and metabolite profiles can be linked to generate a more detailed mechanistic appreciation of the cellular response to both desiccation and rehydration...
March 28, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/28346448/a-footprint-of-desiccation-tolerance-in-the-genome-of-xerophyta-viscosa
#5
Maria-Cecília D Costa, Mariana A S Artur, Julio Maia, Eef Jonkheer, Martijn F L Derks, Harm Nijveen, Brett Williams, Sagadevan G Mundree, José M Jiménez-Gómez, Thamara Hesselink, Elio G W M Schijlen, Wilco Ligterink, Melvin J Oliver, Jill M Farrant, Henk W M Hilhorst
Desiccation tolerance is common in seeds and various other organisms, but only a few angiosperm species possess vegetative desiccation tolerance. These 'resurrection species' may serve as ideal models for the ultimate design of crops with enhanced drought tolerance. To understand the molecular and genetic mechanisms enabling vegetative desiccation tolerance, we produced a high-quality whole-genome sequence for the resurrection plant Xerophyta viscosa and assessed transcriptome changes during its dehydration...
March 27, 2017: Nature Plants
https://www.readbyqxmd.com/read/28337996/protein-interaction-evolution-from-promiscuity-to-specificity-with-reduced-flexibility-in-an-increasingly-complex-network
#6
T Alhindi, Z Zhang, P Ruelens, H Coenen, H Degroote, N Iraci, K Geuten
A key question regarding protein evolution is how proteins adapt to the dynamic environment in which they function and how in turn their evolution shapes the protein interaction network. We used extant and resurrected ancestral plant MADS-domain transcription factors to understand how SEPALLATA3, a protein with hub and glue properties, evolved and takes part in network organization. Although the density of dimeric interactions was saturated in the network, many new interactions became mediated by SEPALLATA3 after a whole genome triplication event...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28286511/bhbzip60-from-resurrection-plant-boea-hygrometrica-is-an-mrna-splicing-activated-endoplasmic-reticulum-stress-regulator-involved-in-drought-tolerance
#7
Bo Wang, Hong Du, Zhennan Zhang, Wenzhong Xu, Xin Deng
Adverse environmental conditions cause endoplasmic reticulum (ER) stress in plants. To mitigate ER stress damage, ER associated transcription factors and inositol-requiring enzyme-1 (IRE1)-mediated bZIP60 mRNA splicing are activated in plants. A drought-induced gene, encoding the ortholog of AtbZIP60, was identified in the resurrection plant Boea hygrometrica, termed BhbZIP60. In response to ER stress and dehydration, BhbZIP60 mRNA can be spliced to create a frame shift in the C terminus by the excision of 23b segment in a manner of its ortholog in other plants, thus translocating to the nucleus instead of the cytoplasm...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28268193/antioxidant-defense-during-desiccation-of-the-resurrection-plant-haberlea-rhodopensis
#8
Katya Georgieva, Soleya Dagnon, Emiliya Gesheva, Dimitar Bojilov, Gergana Mihailova, Snezhana Doncheva
Maintaining a strong antioxidant system is essential for preventing drought-induced oxidative stress. Thus, in the present study we investigated the role of some non-enzymic and enzymic antioxidants in desiccation tolerance of Haberlea rhodopensis. The effects of high light upon desiccation on antioxidant capacity was estimated by comparing the response of shade and sun plants. The significant enhancement of the antioxidant capacity at 8% RWC corresponded to an enormous increase in flavonoid content. The important role of ascorbate-glutathione cycle in overcoming oxidative stress during drying of H...
May 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28265281/chloroplast-genome-analysis-of-resurrection-tertiary-relict-haberlea-rhodopensis-highlights-genes-important-for-desiccation-stress-response
#9
Zdravka Ivanova, Gaurav Sablok, Evelina Daskalova, Gergana Zahmanova, Elena Apostolova, Galina Yahubyan, Vesselin Baev
Haberlea rhodopensis is a paleolithic tertiary relict species, best known as a resurrection plant with remarkable tolerance to desiccation. When exposed to severe drought stress, H. rhodopensis shows an ability to maintain the structural integrity of its photosynthetic apparatus, which re-activates easily upon rehydration. We present here the results from the assembly and annotation of the chloroplast (cp) genome of H. rhodopensis, which was further subjected to comparative analysis with the cp genomes of closely related species...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28248249/enzymes-and-metabolites-in-carbohydrate-metabolism-of-desiccation-tolerant-plants
#10
REVIEW
Qingwei Zhang, Xiaomin Song, Dorothea Bartels
Resurrection plants can tolerate extreme water loss. Substantial sugar accumulation is a phenomenon in resurrection plants during dehydration. Sugars have been identified as one important factor contributing to desiccation tolerance. Phylogenetic diversity of resurrection plants reflects the diversity of sugar metabolism in response to dehydration. Sugars, which accumulate during dehydration, have been shown to protect macromolecules and membranes and to scavenge reactive oxygen species. This review focuses on the performance of enzymes participating in sugar metabolism during dehydration stress...
December 15, 2016: Proteomes
https://www.readbyqxmd.com/read/27974806/chemical-intervention-in-plant-sugar-signalling-increases-yield-and-resilience
#11
Cara A Griffiths, Ram Sagar, Yiqun Geng, Lucia F Primavesi, Mitul K Patel, Melissa K Passarelli, Ian S Gilmore, Rory T Steven, Josephine Bunch, Matthew J Paul, Benjamin G Davis
The pressing global issue of food insecurity due to population growth, diminishing land and variable climate can only be addressed in agriculture by improving both maximum crop yield potential and resilience. Genetic modification is one potential solution, but has yet to achieve worldwide acceptance, particularly for crops such as wheat. Trehalose-6-phosphate (T6P), a central sugar signal in plants, regulates sucrose use and allocation, underpinning crop growth and development. Here we show that application of a chemical intervention strategy directly modulates T6P levels in planta...
December 14, 2016: Nature
https://www.readbyqxmd.com/read/27638206/convergent-evolution-of-caffeine-in-plants-by-co-option-of-exapted-ancestral-enzymes
#12
Ruiqi Huang, Andrew J O'Donnell, Jessica J Barboline, Todd J Barkman
Convergent evolution is a process that has occurred throughout the tree of life, but the historical genetic and biochemical context promoting the repeated independent origins of a trait is rarely understood. The well-known stimulant caffeine, and its xanthine alkaloid precursors, has evolved multiple times in flowering plant history for various roles in plant defense and pollination. We have shown that convergent caffeine production, surprisingly, has evolved by two previously unknown biochemical pathways in chocolate, citrus, and guaraná plants using either caffeine synthase- or xanthine methyltransferase-like enzymes...
September 20, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27634049/a-harvest-of-weeds-yields-insight-into-a-case-of-contemporary-evolution
#13
Steven J Franks
When Charles Darwin was exploring the idea of evolution via natural selection, he looked to domesticated species, with the opening chapter of The Origin of Species titled 'Variation Under Domestication' (Darwin ). Domesticated species such as crops are a great example of artificial selection, which Darwin realized was analogous to natural selection. But growing among those carefully selected crop varieties are the unwelcome and unwanted plants we call weeds. Despite the importance of weeds and long-standing interest in their evolution (Baker ), we still know little about how agricultural weeds evolve, and we often fail to take evolution into account when attempting to manage them (Neve et al...
September 2016: Molecular Ecology
https://www.readbyqxmd.com/read/27616791/generic-hyper-diversity-in-stachybotriaceae
#14
L Lombard, J Houbraken, C Decock, R A Samson, M Meijer, M Réblová, J Z Groenewald, P W Crous
The family Stachybotriaceae was recently introduced to include the genera Myrothecium, Peethambara and Stachybotrys. Members of this family include important plant and human pathogens, as well as several species used in industrial and commercial applications as biodegraders and biocontrol agents. However, the generic boundaries in Stachybotriaceae are still poorly defined, as type material and sequence data are not readily available for taxonomic studies. To address this issue, we performed multi-locus phylogenetic analyses using partial gene sequences of the 28S large subunit (LSU), the internal transcribed spacer regions and intervening 5...
June 2016: Persoonia
https://www.readbyqxmd.com/read/27575326/qualitative-and-quantitative-phytochemical-characterization-of-myrothamnus-flabellifolia-welw
#15
Claudia Engelhardt, Frank Petereit, Matthias Lechtenberg, Ursula Liefländer-Wulf, Andreas Hensel
The upper aerial parts and leaf tips of Myrothamnus flabellifolia Welw. (Myrothamnaceae), a resurrection plant indigenous to southern Africa, are used in African traditional medicine for infections of the respiratory and urinary system as well as for inflammation of mucosa and skin. Within a phytochemical investigation of the herbal material from M. flabellifolia the flavonoid fraction was shown to contain quercetin 10 as well as the respective 3-O-β-d-galactosides, glucosides, -glucuronides and 3-O-α-l-rhamnosides of quercetin (6, 7, 8, 26) and kaempferol (1, 2, 3, 9)...
October 2016: Fitoterapia
https://www.readbyqxmd.com/read/27403565/studying-the-supramolecular-organization-of-photosynthetic-membranes-within-freeze-fractured-leaf-tissues-by-cryo-scanning-electron-microscopy
#16
Dana Charuvi, Reinat Nevo, Ifat Kaplan-Ashiri, Eyal Shimoni, Ziv Reich
Cryo-scanning electron microscopy (SEM) of freeze-fractured samples allows investigation of biological structures at near native conditions. Here, we describe a technique for studying the supramolecular organization of photosynthetic (thylakoid) membranes within leaf samples. This is achieved by high-pressure freezing of leaf tissues, freeze-fracturing, double-layer coating and finally cryo-SEM imaging. Use of the double-layer coating method allows acquiring high magnification (>100,000X) images with minimal beam damage to the frozen-hydrated samples as well as minimal charging effects...
2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27258321/protection-of-the-photosynthetic-apparatus-against-dehydration-stress-in-the-resurrection-plant-craterostigma-pumilum
#17
Ahmad Zia, Berkley J Walker, Hui Min Olivia Oung, Dana Charuvi, Peter Jahns, Asaph B Cousins, Jill M Farrant, Ziv Reich, Helmut Kirchhoff
The group of homoiochlorophyllous resurrection plants evolved the unique capability to survive severe drought stress without dismantling the photosynthetic machinery. This implies that they developed efficient strategies to protect the leaves from reactive oxygen species (ROS) generated by photosynthetic side reactions. These strategies, however, are poorly understood. Here, we performed a detailed study of the photosynthetic machinery in the homoiochlorophyllous resurrection plant Craterostigma pumilum during dehydration and upon recovery from desiccation...
September 2016: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/27140640/predicting-the-evolutionary-dynamics-of-seasonal-adaptation-to-novel-climates-in-arabidopsis-thaliana
#18
COMMENT
Alexandre Fournier-Level, Emily O Perry, Jonathan A Wang, Peter T Braun, Andrew Migneault, Martha D Cooper, C Jessica E Metcalf, Johanna Schmitt
Predicting whether and how populations will adapt to rapid climate change is a critical goal for evolutionary biology. To examine the genetic basis of fitness and predict adaptive evolution in novel climates with seasonal variation, we grew a diverse panel of the annual plant Arabidopsis thaliana (multiparent advanced generation intercross lines) in controlled conditions simulating four climates: a present-day reference climate, an increased-temperature climate, a winter-warming only climate, and a poleward-migration climate with increased photoperiod amplitude...
May 17, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27129952/the-role-of-transketolase-and-octulose-in-the-resurrection-plant-craterostigma-plantagineum
#19
Qingwei Zhang, Thomas Vitus Linnemann, Lukas Schreiber, Dorothea Bartels
Phylogenetic analysis revealed that Craterostigma plantagineum has two transketolase genes (transketolase 7 and 10) which are separated from the other transketolase genes including transketolase 3 from C. plantagineum We obtained recombinant transketolase 3, 7, and 10 of C. plantagineum and showed that transketolase 7 and 10 of C. plantagineum, but not transketolase 3, catalyse the formation of octulose-8-phosphate in vitro Transketolase 7 and 10 of C. plantagineum performed the exchange reaction that produces octulose-8-phosphate using glucose-6-phosphate and fructose-6-phosphate as substrates...
May 2016: Journal of Experimental Botany
https://www.readbyqxmd.com/read/27092152/organ-specific-proteomic-dissection-of-selaginella-bryopteris-undergoing-dehydration-and-rehydration
#20
Farah Deeba, Ashutosh K Pandey, Vivek Pandey
To explore molecular mechanisms underlying the physiological response of Selaginella bryopteris, a comprehensive proteome analysis was carried out in roots and fronds undergoing dehydration and rehydration. Plants were dehydrated for 7 days followed by 2 and 24 h of rehydration. In roots out of 59 identified spots, 58 protein spots were found to be up-regulated during dehydration stress. The identified proteins were related to signaling, stress and defense, protein and nucleotide metabolism, carbohydrate and energy metabolism, storage and epigenetic control...
2016: Frontiers in Plant Science
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