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Plant Science: An International Journal of Experimental Plant Biology

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https://www.readbyqxmd.com/read/27717481/abiotic-stress-upregulated-tazfp34-represses-the-expression-of-type-b-response-regulator-and-shy2-genes-and-enhances-root-to-shoot-ratio-in-wheat
#1
Hongping Chang, Dandan Chen, Jason Kam, Terese Richardson, Janneke Drenth, Xinhong Guo, C Lynne McIntyre, Shoucheng Chai, Anne L Rae, Gang-Ping Xue
Q-type C2H2 zinc finger proteins (ZFPs) are plant-specific DNA-binding proteins containing a conserved QALGGH motif. This study investigated the function of abiotic stress-inducible and predominantly root-expressed Triticum aestivum ZFPs (TaZFP22, TaZFP34 and TaZFP46) with a focus on TaZFP34. Expression of TaZFP34 in roots was upregulated by high salinity, dehydration, oxidative and cold stresses. Overexpression of TaZFP34 in wheat roots resulted in an increased root-to-shoot ratio, a phenomenon observed during plant adaptation to drying soil...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27717480/soybean-proteins-gmtic110-and-gmpsbp-are-crucial-for-chloroplast-development-and-function
#2
Devinder Sandhu, Taylor Atkinson, Andrea Noll, Callie Johnson, Katherine Espinosa, Jessica Boelter, Stephanie Abel, Balpreet K Dhatt, Terese Barta, Eric Singsaas, Sol Sepsenwol, A Susana Goggi, Reid G Palmer
We have identified a viable-yellow and a lethal-yellow chlorophyll-deficient mutant in soybean. Segregation patterns suggested single-gene recessive inheritance for each mutant. The viable- and lethal-yellow plants showed significant reduction of chlorophyll a and b. Photochemical energy conversion efficiency and photochemical reflectance index were reduced in the viable-yellow plants relative to the wildtype, whereas the lethal-yellow plants showed no electron transport activity. The viable-yellow plants displayed reduced thylakoid stacking, while the lethal-yellow plants exhibited failure of proplastid differentiation into normal chloroplasts with grana...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27717479/mesophyll-conductance-and-reaction-diffusion-models-for-co2-transport-in-c3-leaves-needs-opportunities-and-challenges
#3
Herman N C Berghuijs, Xinyou Yin, Q Tri Ho, Steven M Driever, Moges A Retta, Bart M Nicolaï, Paul C Struik
One way to increase potential crop yield could be increasing mesophyll conductance gm. This variable determines the difference between the CO2 partial pressure in the intercellular air spaces (Ci) and that near Rubisco (Cc). Various methods can determine gm from gas exchange measurements, often combined with measurements of chlorophyll fluorescence or carbon isotope discrimination. gm lumps all biochemical and physical factors that cause the difference between Cc and Ci. gm appears to vary with Ci. This variability indicates that gm does not satisfy the physical definition of a conductance according to Fick's first law and is thus an apparent parameter...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27717478/physiological-adjustments-of-a-mediterranean-shrub-to-long-term-experimental-warming-and-drought-treatments
#4
Daijun Liu, Joan Llusia, Romà Ogaya, Marc Estiarte, Laura Llorens, Xiaohong Yang, Josep Peñuelas
Warmer temperatures and extended drought in the Mediterranean Basin are becoming increasingly important in determining plant physiological processes and affecting the regional carbon budget. The responses of plant physiological variables such as shoot water potential (Ψ), carbon-assimilation rates (A), stomatal conductance (gs) and intrinsic water-use efficiency (iWUE) to these climatic regimes, however, are not well understood. We conducted long-term (16 years) field experiments with mild nocturnal warming (+0...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27717477/sunflower-hagpat9-1-is-the-predominant-gpat-during-seed-development
#5
Miriam Payá-Milans, Jose Antonio Aznar-Moreno, Tiago S Balbuena, Richard P Haslam, Satinder K Gidda, Javier Pérez-Hormaeche, Robert T Mullen, Jay J Thelen, Johnathan A Napier, Joaquín J Salas, Rafael Garcés, Enrique Martínez-Force, Mónica Venegas-Calerón
In oil crops, triacylglycerol biosynthesis is an important metabolic pathway in which glycerol-3-phosphate acyltransferase (GPAT) performs the first acylation step. Mass spectrometry analysis of developing sunflower (Helianthus annuus) seed membrane fractions identified an abundant GPAT, HaGPAT9 isoform 1, with a N-terminal peptide that possessed two phosphorylated residues with possible regulatory function. HaGPAT9-1 belongs to a broad eukaryotic GPAT family, similar to mammalian GPAT3, and it represents one of the two sunflower GPAT9 isoforms, sharing 90% identity with HaGPAT9-2...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27717476/the-cholodny-went-theory-does-not-explain-hydrotropism
#6
Doron Shkolnik, Hillel Fromm
Optimization of water foraging by plants is partially achieved by the ability of roots to direct growth towards high water potential, a phenomenon termed hydrotropism. In contrast to gravitropism and phototropism, which require auxin redistribution, as suggested by the Cholodny-Went theory, hydrotropism is not mediated by the phytohormone auxin, which raises questions about the mechanism underlying this tropic response. Here we specify the open questions in this field of research and discuss the possible interactions of abscisic acid, calcium and reactive oxygen species as part of a dynamic system of sensing water potential in the root tip, transmission of the signal to the root elongation zone and promoting root curvature towards water...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27717475/identification-of-stable-qtls-for-seed-oil-content-by-combined-linkage-and-association-mapping-in-brassica-napus
#7
Fengming Sun, Jing Liu, Wei Hua, Xingchao Sun, Xinfa Wang, Hanzhong Wang
Seed oil content is an important agricultural trait in rapeseed breeding. Although numerous quantitative trait locus (QTL) have been identified, most of them cannot be applied in practical breeding mainly due to environmental instability or large confidence intervals. The purpose of this study was to identify and validate high quality and more stable QTLs by combining linkage mapping and genome-wide association study (GWAS). For linkage mapping, we constructed two F2 populations from crosses of high-oil content (∼50%) lines 6F313 and 61616 with a low-oil content (∼40%) line 51070...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27717474/genome-wide-development-and-deployment-of-informative-intron-spanning-and-intron-length-polymorphism-markers-for-genomics-assisted-breeding-applications-in-chickpea
#8
Rishi Srivastava, Deepak Bajaj, Yogesh K Sayal, Prabina K Meher, Hari D Upadhyaya, Rajendra Kumar, Shailesh Tripathi, Chellapilla Bharadwaj, Atmakuri R Rao, Swarup K Parida
The discovery and large-scale genotyping of informative gene-based markers is essential for rapid delineation of genes/QTLs governing stress tolerance and yield component traits in order to drive genetic enhancement in chickpea. A genome-wide 119169 and 110491 ISM (intron-spanning markers) from 23129 desi and 20386 kabuli protein-coding genes and 7454 in silico InDel (insertion-deletion) (1-45-bp)-based ILP (intron-length polymorphism) markers from 3283 genes were developed that were structurally and functionally annotated on eight chromosomes and unanchored scaffolds of chickpea...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27717473/spatial-differences-in-z-3-hexen-1-ol-production-preferentially-reduces-spodoptera-litura-larva-attack-on-the-young-leaves-of-nicotiana-benthamiana
#9
Yuqian Zhang, Xiumin Fu, Feiyan Wang, Ziyin Yang
Plants synthesize specialized metabolites which possess extremely important ecological functions including direct defense, indirect defense, and signaling. The optimal defense theory (ODT) proposes that defensive metabolites are preferentially allocated to the tissues with high fitness value or in locations that are easily injured. In our present study, using the model plant Nicotiana benthamiana, we found that direct defense of N. benthamiana against Spodoptera litura (Fabricius) larvae showed spatial differences in the sites producing defensive chemicals...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27717472/the-coordinated-regulation-of-na-and-k-in-hordeum-brevisubulatum-responding-to-time-of-salt-stress
#10
Chun-Mei Wang, Zeng-Run Xia, Guo-Qiang Wu, Hui-Jun Yuan, Xin-Rui Wang, Jin-Hua Li, Fu-Ping Tian, Qian Zhang, Xin-Qiang Zhu, Jiong-Jie He, Tanweer Kumar, Xiao-Li Wang, Jin-Lin Zhang
Hordeum brevisubulatum, called as wild barley, is a useful monocotyledonous halophyte for soil improvement in northern China. Although previously studied, its main salt tolerance mechanism remained controversial. The current work showed that shoot Na(+) concentration was increased rapidly with stress time and significantly higher than in wheat during 0-168h of 100mM NaCl treatment. Similar results were also found under 25 and 50mM NaCl treatments. Even K(+) was increased from 0.01 to 50mM in the cultural solution, no significant effect was found on tissue Na(+) concentrations...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27717471/genetic-variability-of-the-phloem-sap-metabolite-content-of-maize-zea-mays-l-during-the-kernel-filling-period
#11
Zhazira Yesbergenova-Cuny, Sylvie Dinant, Marie-Laure Martin-Magniette, Isabelle Quilleré, Patrick Armengaud, Priscilla Monfalet, Peter J Lea, Bertrand Hirel
Using a metabolomic approach, we have quantified the metabolite composition of the phloem sap exudate of seventeen European and American lines of maize that had been previously classified into five main groups on the basis of molecular marker polymorphisms. In addition to sucrose, glutamate and aspartate, which are abundant in the phloem sap of many plant species, large quantities of aconitate and alanine were also found in the phloem sap exudates of maize. Genetic variability of the phloem sap composition was observed in the different maize lines, although there was no obvious relationship between the phloem sap composition and the five previously classified groups...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27717470/seed-maturation-simplification-of-control-networks-in-plants
#12
Martine Devic, Thomas Roscoe
Networks controlling developmental or metabolic processes in plants are often complex as a consequence of the duplication and specialisation of the regulatory genes as well as the numerous levels of transcriptional and post-transcriptional controls added during evolution. Networks serve to accommodate multicellular complexity and increase robustness to environmental changes. Mathematical simplification by regrouping genes or pathways in a limited number of hubs has facilitated the construction of models for complex traits...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27717469/de-novo-transcriptome-assembly-and-identification-of-the-gene-conferring-a-pandan-like-aroma-in-coconut-cocos-nucifera-l
#13
Chatree Saensuk, Samart Wanchana, Kiattawee Choowongkomon, Sugunya Wongpornchai, Tippaya Kraithong, Wachiraya Imsabai, Ekawat Chaichoompu, Vinitchan Ruanjaichon, Theerayut Toojinda, Apichart Vanavichit, Siwaret Arikit
Thailand's aromatic coconut (Cocos nucifera L.) is a special type of green dwarf coconut, the liquid endosperm of which is characterized by a pleasant "pandan-like" aroma due to the presence of 2-acetyl-1-pyrroline (2AP). The aim of this study was to perform a de novo assembly of transriptome from C. nucifera endosperm and to identify the gene responsible for 2AP biosynthesis. CnAMADH2 was identified as an ortholog of the rice aromatic gene and a G-to-C substitution found in exon 14 was associated with 2AP content in the aromatic green dwarf coconut accessions...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27717468/expression-of-a-grape-vitis-vinifera-bzip-transcription-factor-vlbzip36-in-arabidopsis-thaliana-confers-tolerance-of-drought-stress-during-seed-germination-and-seedling-establishment
#14
Mingxing Tu, Xianhang Wang, Tongying Feng, Xiaomeng Sun, Yaqiong Wang, Li Huang, Min Gao, Yuejin Wang, Xiping Wang
Drought is one of the most serious factors that limit agricultural productivity and there is considerable interest in understanding the molecular bases of drought responses and their regulation. While numbers of basic leucine zipper (bZIP) transcription factors (TFs) are known to play key roles in response of plants to various abiotic stresses, only a few group K bZIP TFs have been functionally characterized in the context of stress signaling. In this study, we characterized the expression of the grape (Vitis vinifera) group K bZIP gene, VlbZIP36, and found evidence for its involvement in response to drought and the stress-associated phytohormone abscisic acid (ABA)...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27717467/induced-plant-defenses-suppress-herbivore-reproduction-but-also-constrain-predation-of-their-offspring
#15
Livia M S Ataide, Maria L Pappas, Bernardus C J Schimmel, Antonio Lopez-Orenes, Juan M Alba, Marcus V A Duarte, Angelo Pallini, Robert C Schuurink, Merijn R Kant
Inducible anti-herbivore defenses in plants are predominantly regulated by jasmonic acid (JA). On tomato plants, most genotypes of the herbivorous generalist spider mite Tetranychus urticae induce JA defenses and perform poorly on it, whereas the Solanaceae specialist Tetranychus evansi, who suppresses JA defenses, performs well on it. We asked to which extent these spider mites and the predatory mite Phytoseiulus longipes preying on these spider mites eggs are affected by induced JA-defenses. By artificially inducing the JA-response of the tomato JA-biosynthesis mutant def-1 using exogenous JA and isoleucine (Ile), we first established the relationship between endogenous JA-Ile-levels and the reproductive performance of spider mites...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27717466/characterization-of-the-arabidopsis-thaliana-2-cys-peroxiredoxin-interactome
#16
Delphine Cerveau, Alexandra Kraut, Henrik U Stotz, Martin J Mueller, Yohann Couté, Pascal Rey
Peroxiredoxins are ubiquitous thiol-dependent peroxidases for which chaperone and signaling roles have been reported in various types of organisms in recent years. In plants, the peroxidase function of the two typical plastidial 2-Cys peroxiredoxins (2-Cys PRX A and B) has been highlighted while the other functions, particularly in ROS-dependent signaling pathways, are still elusive notably due to the lack of knowledge of interacting partners. Using an ex vivo approach based on co-immunoprecipitation of leaf extracts from Arabidopsis thaliana wild-type and mutant plants lacking 2-Cys PRX expression followed by mass spectrometry-based proteomics, 158 proteins were found associated with 2-Cys PRXs...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27717465/temporal-and-spatial-expression-and-function-of-tadlea3-in-triticum-aestivum-during-developmental-stages-under-drought-stress
#17
Juan Chen, Lei Fan, Ya Du, Weining Zhu, Ziqin Tang, Na Li, Dapeng Zhang, Linsheng Zhang
Drought stress is a major factor limiting wheat growth and productivity. Late embryogenesis abundant (LEA) proteins are tolerant to water-related stress. To reveal the regulatory mechanisms of LEA proteins under drought stress, we cloned a novel group 3 LEA gene, namely, TaDlea3, from wheat (Triticum aestivum L.) Shaanhe 6. Subcellular localization assay showed that TaDlea3 protein accumulated in the cytoplasm. Quantitative real-time polymerase chain reaction results revealed that TaDlea3 expression was induced by drought stress...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27717464/nitric-oxide-is-involved-in-stomatal-development-by-modulating-the-expression-of-stomatal-regulator-genes-in-arabidopsis
#18
Zheng-Wei Fu, Yan-Li Wang, Ying-Tang Lu, Ting-Ting Yuan
As sessile organisms, plants require many flexible strategies to adapt to the environment. Although some environmental signaling pathways regulating stomatal development have been identified, how stomatal regulators are modulated by internal and external signals to determine the final stomatal abundance requires further exploration. In our studies, we found that nitric oxide (NO) promotes stomatal development with increased stomatal index as well as the relative number of meristemoids and guard mother cells [%(M+GMC)] in NO-treated wild-type Arabidopsis plants; this role of NO was further verified in the nox1 mutant, which exhibits higher NO levels, and the noa1 mutant, which exhibits low NO accumulation...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27717463/a-raf-like-mapkkk-gene-ghraf19-negatively-regulates-tolerance-to-drought-and-salt-and-positively-regulates-resistance-to-cold-stress-by-modulating-reactive-oxygen-species-in-cotton
#19
Haihong Jia, Lili Hao, Xulei Guo, Shuchang Liu, Yan Yan, Xingqi Guo
Mitogen-activated protein kinase kinase kinases (MAPKKKs) function at the top level of MAPK cascades and play important roles in plant development and stress responses. Although MAPKKKs comprise the largest family in the MAPK cascades, very few Raf-like MAPKKKs have been functionally identified, especially in the economically important crop cotton. In this study, a Raf-like MAPKKK gene, GhRaf19, was characterized for the first time in cotton. Our data show that the expression of GhRaf19 was inhibited by PEG and NaCl and induced by cold (4°C) and H2O2...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27717462/plastidic-p2-glucose-6p-dehydrogenase-from-poplar-is-modulated-by-thioredoxin-m-type-distinct-roles-of-cysteine-residues-in-redox-regulation-and-nadph-inhibition
#20
Manuela Cardi, Mirko Zaffagnini, Alessia De Lillo, Daniela Castiglia, Kamel Chibani, José Manuel Gualberto, Nicolas Rouhier, Jean-Pierre Jacquot, Sergio Esposito
A cDNA coding for a plastidic P2-type G6PDH isoform from poplar (Populus tremula x tremuloides) has been used to express and purify to homogeneity the mature recombinant protein with a N-terminus His-tag. The study of the kinetic properties of the recombinant enzyme showed an in vitro redox sensing modulation exerted by reduced DTT. The interaction with thioredoxins (TRXs) was then investigated. Five cysteine to serine variants (C145S - C175S - C183S - C195S - C242S) and a variant with a double substitution for Cys(175) and Cys(183) (C175S/C183S) have been generated, purified and biochemically characterized in order to investigate the specific role(s) of cysteines in terms of redox regulation and NADPH-dependent inhibition...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
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