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Journal of Integrative Plant Biology

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https://www.readbyqxmd.com/read/28332291/arabidopsis-forehead-associated-domain-protein-3-negatively-regulates-peroxisome-division
#1
LETTER
Mintu Desai, Ronghui Pan, Jianping Hu
Peroxisomes are ubiquitous and dynamic eukaryotic organelles capable of altering their abundance in response to environmental and developmental cues, yet the regulatory mechanism of plant peroxisome division/proliferation is unclear. To identify transcriptional regulators of the peroxisome division factor gene PEX11b, we performed a nuclear pull-down experiment and identified Arabidopsis Forehead-Associated Domain Protein 3 (FHA3) as a novel protein that binds to the promoter of PEX11b. Our data supported the conclusion that, in contrast to the previously identified HY5 HOMOLOG (HYH) protein that promotes the transcription of PEX11b, FHA3 is a negative regulator of PEX11b expression and peroxisome division...
March 23, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28328106/the-plant-vascular-system-from-resource-allocation-inter-organ-communication-and-defense-to-evolution-of-the-monocot-cambium
#2
EDITORIAL
William J Lucas, Chun-Ming Liu
In recent years, considerable attention has been paid to exploring the complex gene regulatory networks involved in the development of the plant vascular system. Such information is crucial to our understanding of the molecular and cellular events which give rise to the integrated tissues of the xylem and phloem, leading to the formation of structurally continuous conduits that interconnect various organs of the plant. Vascular development begins in the embryo to form progenitor cells, and upon germination, these progenitor cells and their decedents in the shoot and root meristems will form phloem and xylem, and the cambium...
March 22, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28304135/transport-of-chemical-signals-in-systemic-acquired-resistance
#3
REVIEW
Archana Singh, Gah-Hyun Lim, Pradeep Kachroo
Systemic acquired resistance (SAR) is a form of broad-spectrum resistance induced in response to local infections that protects uninfected parts against subsequent secondary infections by related or unrelated pathogens. SAR signaling requires two parallel branches, one regulated by salicylic acid (SA), and the other by azelaic acid (AzA) and glycerol-3-phosphate (G3P). AzA and G3P function downstream of the free radicals nitric oxide (NO) and reactive oxygen species (ROS). During SAR, SA, AzA, and G3P accumulate in the infected leaves, but only a small portion of these is transported to distal uninfected leaves...
March 17, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28304127/molecular-regulation-of-sucrose-catabolism-and-sugar-transport-for-development-defence-and-phloem-function
#4
REVIEW
Jun Li, Limin Wu, Ryan Foster, Yong-Ling Ruan
Sucrose (Suc) is the major end product of photosynthesis in mesophyll cells of most vascular plants. It is loaded into phloem of mature leaves for long-distance translocation to non-photosynthetic organs where it is unloaded for diverse uses. Clearly, Suc transport and metabolism is central to plant growth and development and the functionality of the entire vascular system. Despite of vast information in the literature about the physiological roles of individual sugar metabolic enzymes and transporters, there is a lack of systematic evaluation about their molecular regulation from transcriptional to post-translational levels...
March 17, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28304126/transcript-profiling-of-a-novel-plant-meristem-the-monocot-cambium
#5
Matthew Zinkgraf, Suzanne Gerttula, Andrew Groover
While monocots lack the ability to produce a vascular cambium or woody growth, some monocot lineages evolved a novel lateral meristem, the monocot cambium, which supports secondary radial growth of stems. In contrast to the vascular cambium found in woody angiosperm and gymnosperm species, the monocot cambium produces secondary vascular bundles, which have an amphivasal organization of tracheids encircling a central strand of phloem. Currently there is no information concerning the molecular genetic basis of the development or evolution of the monocot cambium...
March 17, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28296205/the-fungal-umsrt1-and-maize-zmsut1-sucrose-transporters-battle-for-plant-sugar-resources
#6
Anke Wittek, Ingo Dreyer, Khaled A S Al-Rasheid, Norbert Sauer, Rainer Hedrich, Dietmar Geiger
The biotrophic fungus Ustilago maydis causes the corn smut disease inducing tumor formation in its host Zea mays. Upon infection, the fungal hyphae invaginate the plasma membrane of infected maize cells establishing an interface where pathogen and host are separated only by their plasma membranes. At this interface the fungal and maize sucrose transporters, UmSrt1 and ZmSUT1, compete for extracellular sucrose in the corn smut/maize pathosystem. Here we biophysically characterized ZmSUT1 and UmSrt1 in Xenopus oocytes with respect to their voltage-, pH- and substrate-dependence and determined affinities towards protons and sucrose...
March 15, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28294536/acetylglutamate-kinase-is-required-for-both-gametophyte-function-and-embryo-development-in-arabidopsis-thaliana
#7
Jie Huang, Dan Chen, Hailong Yan, Fei Xie, Ying Yu, Liyao Zhang, Mengxiang Sun, Xiongbo Peng
The specific functions of the genes encoding arginine biosynthesis enzymes in plants are not well characterized. We report the isolation and characterization of Arabidopsis thaliana N-acetylglutamate kinase (NAGK), which catalyzes the second step of arginine biosynthesis. NAGK is a plastid-localized protein and is expressed in most developmental processes in Arabidopsis. Heterologous expression of the Arabidopsis NAGK gene in a NAGK-deficient Escherichia coli strain fully bacterial growth on arginine-deficient medium...
March 15, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28296168/plant-xylem-hydraulics-what-we-understand-current-research-and-future-challenges
#8
Martin D Venturas, John S Sperry, Uwe G Hacke
Herein we review the current state-of-the-art of plant hydraulics in the context of plant physiology, ecology, and evolution, focusing on current and future research opportunities. We explain the physics of water transport in plants and the limits of this transport system, highlighting the relationships between xylem structure and function. We describe the great variety of techniques existing for evaluating xylem resistance to cavitation. We address several methodological issues and their connection with current debates on conduit refilling and exponential shape vulnerability curves...
March 14, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28296149/implications-of-nitrogen-phloem-loading-for-carbon-metabolism-and-transport-during-arabidopsis-development
#9
James P Santiago, Mechthild Tegeder
Metabolite transport processes and primary metabolism are highly interconnected. This study examined the importance of source-to-sink nitrogen partitioning, and associated nitrogen metabolism, for carbon capture, transport and usage. Specifically, Arabidopsis aap8 (AMINO ACID PERMEASE 8) mutant lines were analyzed to resolve the consequences of reduced amino acid phloem loading for source leaf carbon metabolism, sucrose phloem transport and sink development during vegetative and reproductive growth phase. Results showed that decreased amino acid transport had a negative effect on sink development of aap8 lines throughout the life cycle leading to an overall decrease in plant biomass...
March 14, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28276639/what-actually-is-the-m%C3%A3-nch-hypothesis-a-short-history-of-assimilate-transport-by-mass-flow
#10
REVIEW
Michael Knoblauch, Winfried S Peters
In the 1920ies, the German forestry scientists Ernst Münch postulated that photo-assimilate transport is a mass flow driven by osmotically-induced pressure gradients between source organs (high turgor) and sink organs (lower turgor). Two crucial components of Münch's hypothesis, the translocation by mass flow from sources to sinks and the osmotic mechanism of pressure flow, were established notions at the time, but had been developed by two institutionally separated groups of scholars. A conceptual separation of whole-plant biology from cellular physiology had followed the institutional separation of forestry science from botany in German-speaking central Europe during the so-called Humboldtian reforms, and was reinforced by the delayed institutionalization of plant physiology as an academic discipline...
March 9, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28267270/a-zinc-finger-protein-interacted-with-cyclophilin-affects-root-development-via-iaa-pathway-in-rice
#11
Peng Cui, Hongbo Liu, Songlin Ruan, Basharat Ali, Rafaqat Ali Gill, Huasheng Ma, Zhifu Zheng, Weijun Zhou
The plant hormone auxin plays a crucial role in lateral root development. To better understand the molecular mechanisms underlying lateral root formation, an auxin-responsive gene OsCYP2 (Os02g0121300) was characterized from rice. Compared to the wild type, OsCYP2-RNAi lines exhibited distinctive defects in lateral root development. Yeast two-hybrid and GST pull-down results confirmed that OsCYP2 interacted with a C2HC-type zinc finger protein (OsZFP, Os01g0252900) which is located in the rice nucleus. T2 OsZFP-RNAi lines had significantly fewer lateral roots than did wild type plants, which suggests a role for OsCYP2 and OsZFP in regulating lateral root development...
March 7, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28263025/poly-adp-ribose-polymerases-regulate-cell-division-and-development-in-arabidopsis-roots
#12
Caifeng Liu, Qiao Wu, Weiwei Liu, Zongyin Gu, Wenjing Wang, Ping Xu, Hong Ma, Xiaochun Ge
Root organogenesis involves cell division, differentiation and expansion. The molecular mechanisms regulating root development are not fully understood. In this study, we identified poly (ADP-ribose) polymerases (PARPs) as new players in root development. PARP catalyzes poly (ADP-ribosyl)ation of proteins by repeatedly adding ADP-ribose units onto proteins using nicotinamide adenine dinucleotide (NAD(+) ) as the donor. We found that inhibition of PARP activities by 3-aminobenzomide (3-AB) increased the growth rates of both primary and lateral roots, leading to a more developed root system...
March 6, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28225199/bik1-cooperates-with-bak1-to-regulate-constitutive-immunity-and-cell-death-in-arabidopsis
#13
LETTER
Jun Liu, Sufen Chen, Lijuan Chen, Qi Zhou, Menglong Wang, Dongru Feng, Jian-Feng Li, Jinfa Wang, Hong-Bin Wang, Bing Liu
In Arabidopsis, both the membrane-anchored Receptor-like kinase (RLK) BAK1 and the Receptor-like cytoplasmic kinase (RLCK) BIK1 are important mediators of transmembrane signal transduction that regulate plant development and immunity. Little attention, however, has been paid to their genetic association. This study found the bak1 bik1 double mutant of Arabidopsis displayed a severe dwarfism phenotype due to constitutive immunity and cell death in developing plants. These data suggest that BIK1 cooperates with BAK1 to regulate constitutive immunity and cell death...
February 22, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28206710/sucrose-transporter2-contributes-to-maize-growth-development-and-crop-yield
#14
Kristen A Leach, Thu M Tran, Thomas L Slewinski, Robert B Meeley, David M Braun
During daylight, plants produce excess photosynthates, including sucrose, which is temporarily stored in the vacuole. At night, plants remobilize sucrose to sustain metabolism and growth. Based on homology to other sucrose transporter (SUT) proteins, we hypothesized the maize (Zea mays) SUCROSE TRANSPORTER2 (ZmSUT2) protein functions as a sucrose/H(+) symporter on the vacuolar membrane to export transiently stored sucrose. To understand the biological role of ZmSut2, we examined its spatial and temporal gene expression, determined the protein subcellular localization, and characterized loss-of-function mutations...
February 16, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28198146/tonoplast-targeting-of-vha-a3-relies-on-a-rab5-mediated-but-rab7-independent-vacuolar-trafficking-route
#15
LETTER
Qiang-Nan Feng, Yan Zhang, Sha Li
Vacuolar trafficking routes and their regulators have recently draw lots of attention in plant cell biology. A recent study reported the discovery of a plant-specific vacuolar trafficking route, i.e. a direct ER-to-vacuole route, through analysis of VHA-a3 subcellular targeting, a key component for the tonoplast V-ATPases. Our recent findings showed that VHA-a3 targets to the tonoplast through a Rab5-mediated but Rab7-independent pathway, shedding new lights on the unconventional vacuolar trafficking route in plant cells...
February 15, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28169508/the-transition-from-a-maternal-to-external-nitrogen-source-in-maize-seedlings
#16
Kasra Sabermanesh, Luke R Holtham, Jessey George, Ute Roessner, Berin A Boughton, Sigrid Heuer, Mark Tester, Darren C Plett, Trevor P Garnett
Maximising NO3 - uptake during seedling development is important as it has a major influence on plant growth and yield. However, little is known about the processes leading to, and involved in, the initiation of root NO3 - uptake capacity in developing seedlings. This study examines the physiological processes involved in root NO3 - uptake and metabolism, to gain an understanding of how the NO3 - uptake system responds to meet demand as maize seedlings transition from seed N use to external N capture. The concentrations of seed-derived free amino acids within root and shoot tissues are initially high, but decrease rapidly until stabilising eight days after imbibition (DAI)...
February 7, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28168848/ora59-and-ein3-interaction-couples-jasmonate-ethylene-synergistic-action-to-antagonistic-salicylic-acid-regulation-of-pdf-expression
#17
Xiang He, Jishan Jiang, Changquan Wang, Katayoon Dehesh
Hormonal crosstalk is central for tailoring plant responses to the nature of challenges encountered. The role of antagonism between the two major defense hormones, salicylic acid (SA) and jasmonic acid (JA), and modulation of this interplay by ethylene (ET) in favor of JA signaling pathway in plant stress responses is well recognized, but the underlying mechanism is not fully understood. Here, we show the opposing function of two transcription factors, ethylene insensitive3 (EIN3) and EIN3-Like1 (EIL1), in SA-mediated suppression and JA-mediated activation of PLANT DEFENSIN1...
February 7, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28093875/what-are-the-evolutionary-origins-of-stomatal-responses-to-abscisic-acid-aba-in-land-plants
#18
Frances C Sussmilch, Timothy J Brodribb, Scott A M McAdam
The evolution of active stomatal closure in response to leaf water deficit, mediated by the hormone abscisic acid (ABA), has been the subject of recent debate. Two different models for the timing of the evolution of this response recur in the literature. A single-step model for stomatal control suggests that stomata evolved active, ABA-mediated control of stomatal aperture, when these structures first appeared, prior to the divergence of bryophyte and vascular plant lineages. In contrast, a gradualistic model for stomatal control proposes that the most basal vascular plant stomata responded passively to changes in leaf water status...
January 17, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28059483/ectopic-expression-of-fungal-ecgdh-improves-nitrogen-assimilation-and-grain-yield-in-rice
#19
LETTER
Dongying Tang, Yuchong Peng, Jianzhong Lin, Changqing Du, Yuanzhu Yang, Dan Wang, Cong Liu, Lu Yan, Xiaoying Zhao, Xia Li, Liangbi Chen, Xuanming Liu
NADP(H)-dependent glutamate dehydrogenases (GDH) in lower organisms have stronger ammonium affinity than those ones from higher plants. Here we report that transgenic rice overexpressing the EcGDH from Eurotium cheralieri exhibited significantly enhanced aminating activities. Hydroponic and field tests showed that nitrogen assimilation efficiency and grain yields were markedly increased in these transgenic plants, especially at the low nitrogen condition. These results suggest that EcGDH may have potential to be used to improve nitrogen assimilation and grain yield in rice...
January 6, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28097830/plant-phosphatidylinositol-specific-phospholipase-c-at-the-center-of-plant-innate-immunity
#20
Ahmed M Abd-El-Haliem, Matthieu H A J Joosten
Understanding plant resistance to pathogenic microbes requires detailed information on the molecular mechanisms controlling the execution of plant innate immune responses. A growing body of evidence places phosphoinositide-specific phospholipase C (PI-PLC) enzymes immediately downstream of activated immune receptors, well upstream of the initiation of early defense responses. An increase of the cytoplasmic levels of free Ca(2+) , lowering of the intercellular pH and the oxidative burst are a few examples of such responses and these are regulated by PI-PLCs...
March 2017: Journal of Integrative Plant Biology
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