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Physiologia Plantarum

Qinqin Chen, Fangfang Niu, Jingli Yan, Bisi Chen, Feifei Wu, Xiaohua Guo, Bo Yang, Yuan-Qing Jiang
The NAC (NAM, ATAF1/2, CUC2) transcription factor gene family is plant-specific and plays diverse roles in development and responses to abiotic stresses and pathogen challenge. Oilseed rape (Brassica napus) or canola is an important oil crop worldwide, however, the function of NAC genes in it remains largely elusive. Here, we identified and characterized the NAC56 gene isolated from oilseed rape. Expression of BnaNAC56 was induced by abscisic acid (ABA), jasmonic acid (JA), methyl viologen (MV) and a necrotrophic fungal pathogen Sclerotinia sclerotiorum, but repressed by cold...
January 18, 2017: Physiologia Plantarum
Anju Manandhar, Thomas R Sinclair, Thomas W Rufty, Michel E Ghanem
Drought can result in severely decreased leaf area development, which impacts plant growth and yield. However, rarely is leaf emergence or leaf expansion separated to resolve the relative sensitivity to water deficit of these two processes. Experiments were undertaken to impose drought over approximately 2 weeks for eight cowpea (Vigna unguiculata) genotypes grown in pots under controlled environmental conditions. Daily measures of phyllochron index (leaf emergence) and leaf area increase (leaf expansion) were obtained...
January 11, 2017: Physiologia Plantarum
Jared J Stewart, Stephanie K Polutchko, William W Adams, Christopher M Cohu, Coleman A Wenzl, Barbara Demmig-Adams
This study addressed whether the winter annual Arabidopsis thaliana can adjust foliar phloem and xylem anatomy both differentially and in parallel. In plants acclimated to hot versus cool temperature, foliar minor vein xylem-to-phloem ratio was greater, whereas xylem and phloem responded concomitantly to growth light intensity. Across all growth conditions, xylem anatomy correlated with transpiration rate, while phloem anatomy correlated with photosynthetic capacity for two plant lines (wildtype Col-0 and tocopherol-deficient vte1 mutant) irrespective of tocopherol status...
January 11, 2017: Physiologia Plantarum
Erola Fenollosa, Sergi Munné-Bosch, Marta Pintó-Marijuan
Photoprotective strategies vary greatly within the plant kingdom and reflect a plant's physiological status and capacity to cope with environment variations. The plasticity and intensity of these responses may determine plant success. Invasive species are reported to show increased vigor to displace native species. Describing the mechanisms that confer such vigor is essential to understanding the success of invasive species. We performed an experiment whereby two species were monitored: Carpobrotus edulis, an aggressive invasive species in the Mediterranean basin, and Crithmum maritimum, a coexisting native species in the Cap de Creus Natural Park (NE Spain)...
January 5, 2017: Physiologia Plantarum
Hanan El Aou-Ouad, Alicia Pou, Magdalena Tomàs, Rafael Montero, Miquel Ribas-Carbo, Hipólito Medrano, Josefina Bota
Water limitation is one of the major threats affecting grapevine production. Thus, improving water use efficiency (WUE) is crucial for a sustainable viticulture industry in Mediterranean regions. Under field conditions, water stress is often combined with viral infections since those are present in major grape-growing areas worldwide. Grapevine leafroll-associated virus 3 (GLRaV-3) is one of the most important viruses, affecting grapevines. Indeed, the optimization of water use in a real context of virus infection is an important topic that needs to be understood...
January 3, 2017: Physiologia Plantarum
Sara I Zandalinas, Ron Mittler, Damián Balfagón, Vicent Arbona, Aurelio Gómez-Cadenas
Under field conditions crops are routinely subjected to a number of different abiotic stress factors simultaneously. Recent studies revealed that the response of plants to a combination of different abiotic stresses is unique and cannot be directly extrapolated from simply studying each of the different stresses applied individually. These studies have also identified specific regulatory transcripts, combinations of metabolites and proteins, and physiological responses that are unique to specific stress combinations, highlighting the importance of studying abiotic stress combination in plants...
January 2, 2017: Physiologia Plantarum
Scarlett Trimborn, Silke Thoms, Tina Brenneis, Jasmin Pascale Heiden, Sara Beszteri, Kai Bischof
To better understand the impact of ocean acidification (OA) and changes in light availability on Southern Ocean phytoplankton physiology, we investigated the effects of pCO2 (380 and 800 µatm) in combination with low and high irradiance (20 or 50 and 200 µmol photons m(-2) s(-1) ) on growth, particulate organic carbon (POC) fixation and photophysiology in the three ecologically relevant species Chaetoceros debilis, Fragilariopsis kerguelensis and Phaeocystis antarctica. Irrespective of the light scenario, neither growth nor POC per cell was stimulated by OA in any of the tested species and the two diatoms even displayed negative responses in growth (e...
December 25, 2016: Physiologia Plantarum
Anna Podgórska, Maria Burian, Anna M Rychter, Allan G Rasmusson, Bożena Szal
Plants can assimilate nitrogen from soil pools of both ammonium and nitrate, and the relative levels of these two nitrogen sources are highly variable in soil. Long-term ammonium nutrition is known to cause damage to Arabidopsis that has been linked to mitochondrial oxidative stress. Using hydroponic cultures, we analysed the consequences of rapid shifts between nitrate and ammonium nutrition. This did not induce growth retardation, showing that Arabidopsis can compensate for the changes in redox metabolism associated with the variations in nitrogen redox status...
December 23, 2016: Physiologia Plantarum
Sara Margarita Garza-Aguilar, Aurora Lara-Núñez, Elpidio García Ramírez, Jorge M Vázquez-Ramos
Maize CycD3;1 associates to CDKA or CDKB1;1 proteins during germination and the complexes formed develop kinase activity. These complexes appear to vary in size as germination proceeds, suggesting association to different sets of proteins. CycD3;1 and associated CDK proteins respond to phytohormones and sucrose. Results revealed a reduction in the CycD3;1 protein amount along germination in the presence of IAA or ABA, although in the latter protein levels recover at the end of germination. While the levels of CDKA increase with IAA, they decrease with ABA...
December 20, 2016: Physiologia Plantarum
Ana Luengo Escobar, Miren Alberdi, Patricio Acevedo, Mariana Machado, Adriano Nunes-Nesi, Claudio Inostroza-Blancheteau, Marjorie Reyes-Díaz
Despite the Montreal protocol and the eventual recovery of the ozone layer over Antarctica, there are still concerns about increased levels of ultraviolet-B (UV-B) radiation in the Southern Hemisphere. UV-B induces physiological, biochemical and morphological stress responses in plants, which are species-specific and different even for closely related cultivars. In woody plant species, understanding of long-term mechanisms to cope with UV-B-induced stress is limited. Therefore, a greenhouse UV-B daily course simulation was performed for 21 days with two blueberry cultivars (Legacy and Bluegold) under UV-BBE irradiance doses of 0, 0...
December 10, 2016: Physiologia Plantarum
Miguel Ángel Macho-Rivero, Juan José Camacho-Cristóbal, María Begoña Herrera-Rodríguez, Maren Müller, Sergi Munné-Bosch, Agustín González-Fontes
Boron (B) is an essential microelement for vascular plant development, but its toxicity is a major problem affecting crop yields in arid and semi-arid areas of the world. In the literature, several genes involved in abscisic acid (ABA) signalling and responses are upregulated in Arabidopsis roots after treatment with excess B. It is known that the AtNCED3 gene, which encodes a crucial enzyme for ABA biosynthesis, plays a key role in the plant response to drought stress. In this study, root AtNCED3 expression and shoot ABA content were rapidly increased in wild-type plants upon B-toxicity treatment...
December 9, 2016: Physiologia Plantarum
Lin Li, Sheng Shu, Qing Xu, Ya-Hong An, Jin Sun, Shi-Rong Guo
Nitric oxide (NO) and hydrogen peroxide (H2 O2 ), two important signalling molecules, are stimulated in plants by abiotic stresses. In this study, we investigated the role of NO and its interplay with H2 O2 in the response of self-grafted and salt-tolerant pumpkin-grafted (Cucurbita maxima × C. moschata) cucumber seedlings to 80 mM Ca(NO3 )2 stress. Endogenous NO and H2 O2 production in self-grafted seedlings increased in a time-dependent manner, reaching maximum levels after 24 h of Ca(NO3 )2 stress. In contrast, a transient increase in NO production, accompanied by H2 O2 accumulation, was observed at 2 h in rootstock-grafted plants...
December 9, 2016: Physiologia Plantarum
Tao Chen, Bo Zhou, Liujian Duan, Hui Zhu, Zhongming Zhang
Mitogen-activated protein kinase (MAPK) cascades are universal signalling modules in eukaryotes, including yeasts, animals and plants. They are involved in responses to various biotic and abiotic stresses, hormones, cell division and developmental processes. A MAPK cascade is composed of three functionally tiered protein kinases, namely MAPK, MAPK kinases (MAPKKs) and MAPK kinase kinases (MAPKKKs). These kinases have been intensively studied for their roles in developmental and physiological processes in various organisms...
December 9, 2016: Physiologia Plantarum
Dileepa M Jayawardena, Scott A Heckathorn, Deepesh R Bista, Sasmita Mishra, Jennifer K Boldt, Charles R Krause
Atmospheric CO2 enrichment is expected to often benefit plant growth, despite causing global warming and nitrogen (N) dilution in plants. Most plants primarily procure N as inorganic nitrate (NO3(-) ) or ammonium (NH4(+) ), using membrane-localized transport proteins in roots, which are key targets for improving N use. Although interactive effects of elevated CO2 , chronic warming and N form on N relations are expected, these have not been studied. In this study, tomato (Solanum lycopersicum) plants were grown at two levels of CO2 (400 or 700 ppm) and two temperature regimes (30 or 37°C), with NO3(-) or NH4(+) as the N source...
November 28, 2016: Physiologia Plantarum
Fang Qi, Zhixin Xiang, Ninghai Kou, Weiti Cui, Daokun Xu, Ren Wang, Dan Zhu, Wenbiao Shen
Our previous studies revealed that methane (CH4 ) induces adventitious rooting in cucumber. However, the corresponding molecular mechanism is still elusive. In this work, we discovered that CH4 triggered the accumulation of nitric oxide (NO) and thereafter cucumber adventitious rooting, mimicking the inducing effects of sodium nitroprusside (SNP) and NONOate (two NO-releasing compounds). Above mentioned responses were sensitive to NO scavenger(s), showing that the accumulation of NO and adventitious root development were respectively impaired...
November 24, 2016: Physiologia Plantarum
Anouk Lavoie-Lamoureux, Dario Sacco, Paul-André Risse, Claudio Lovisolo
The main factors regulating grapevine response to decreasing water availability were assessed under statistical support using published data related to leaf water relations in an extensive range of scion and rootstock genotypes. Matching Ψleaf and gs data were collected from peer-reviewed literature with associated information. The resulting database contained 718 data points from 26 different Vitis vinifera varieties investigated as scions, 15 non-V. vinifera rootstock genotypes and 11 own-rooted V. vinifera varieties...
November 18, 2016: Physiologia Plantarum
Hatsumi Nozue, Kaori Oono, Yoshinobu Ichikawa, Shun Tanimura, Kana Shirai, Kintake Sonoike, Masayuki Nozue, Nobuaki Hayashida
Structural variation in the stroma-grana (SG) arrangement of the thylakoid membranes, such as changes in the thickness of the grana stacks and in the ratio between grana and inter-grana thylakoid, is often observed. Broadly, such alterations are considered acclimation to changes in growth and the environment. However, the relation of thylakoid morphology to plant growth and photosynthesis remains obscure. Here, we report changes in the thylakoid during leaf development under a fixed light condition. Histological studies on the chloroplasts of fresh green Arabidopsis leaves have shown that characteristically shaped thylakoid membranes lacking the inter-grana region, referred to hereafter as isolated-grana (IG), occurred adjacent to highly ordered, large grana layers...
November 17, 2016: Physiologia Plantarum
Hong C Nguyen, Phi B Cao, Hélène San Clemente, Raphaël Ployet, Fabien Mounet, Natalie Ladouce, Luc Harvengt, Christiane Marque, Chantal Teulieres
Annotation of the Eucalyptus grandis genome showed a large amplification of the DREB1/CBF group without recent DREB2 gene duplication compared to other plant species. The present annotation of the CBF and DREB2 genes from a draft of the Eucalyptus gunnii genome sequence reveals at least an additional CBF copy in the E. gunnii genome compared to E. grandis, suggesting that this group is still evolving, unlike the DREB2 group. This study aims to investigate the redundancy/neo- or sub-functionalization of the duplicates and the relative involvement of the two groups in abiotic stress responses in both E...
November 16, 2016: Physiologia Plantarum
Eriko Maejima, Mitsuru Osaki, Tadao Wagatsuma, Toshihiro Watanabe
High aluminum (Al) concentration in soil solution is the most important factor restricting plant growth in acidic soils. However, various plant species naturally grow in such soils. Generally, they are highly tolerant to Al, but organic acid exudation, the most common Al tolerance mechanism, cannot explain their tolerance. Lower phospholipid and higher sterol proportions in root plasma membrane enhance Al tolerance. Other cellular components, such as cell walls and phenolics, may also be involved in Al tolerance mechanisms...
November 1, 2016: Physiologia Plantarum
Haipeng Guo, Xue Feng, Chuntao Hong, Houming Chen, Fanrong Zeng, Bingsong Zheng, Dean Jiang
Miscanthus is a vigorous perennial Gramineae genus grown throughout the world as a promising bioenergy crop and generally regarded as heavy metal tolerant due to its ability to absorb heavy metals. However, little is known about the mechanism for heavy metal tolerance in Miscanthus. In this study, two Miscanthus species (Miscanthus sacchariflorus and Miscanthus floridulus) exhibiting different cadmium (Cd) sensitivity were used to address the mechanisms of Cd tolerance. Under the same Cd stress, M. sacchariflorus showed higher Cd tolerance with better growth and lower Cd accumulation in both shoots and roots than M...
October 27, 2016: Physiologia Plantarum
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