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Journal of Integrative Plant Biology

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https://read.qxmd.com/read/30761735/pex16-contributions-to-peroxisome-import-and-metabolism-revealed-by-viable-arabidopsis-pex16-mutants
#1
Sarah E Burkhart, Roxanna J Llinas, Bonnie Bartel
Peroxisomes rely on peroxins (PEX proteins) for biogenesis, importing membrane and matrix proteins, and fission. PEX16, which is implicated in peroxisomal membrane protein targeting and forming nascent peroxisomes from the endoplasmic reticulum (ER), is unusual among peroxins because it is inserted co-translationally into the ER and localizes to both ER and peroxisomal membranes. PEX16 mutations in humans, yeast, and plants confer some common peroxisomal defects; however, apparent functional differences have impeded the development of a unified model for PEX16 action...
February 14, 2019: Journal of Integrative Plant Biology
https://read.qxmd.com/read/30761734/plant-peroxisomal-solute-transporter-proteins
#2
REVIEW
Lennart Charton, Anastasija Plett, Nicole Linka
Plant peroxisomes are unique subcellular organelles which play an indispensable role in several key metabolic pathways, including fatty acid β-oxidation, photorespiration, and degradation of reactive oxygen species. The compartmentalization of metabolic pathways into peroxisomes is a strategy for organizing the metabolic network and improving pathway efficiency. An important prerequisite, however, is the exchange of metabolites between peroxisomes and other cell compartments. Since the first studies in 1970 s scientists contributed to understanding how solutes enter or leave this organelle...
February 14, 2019: Journal of Integrative Plant Biology
https://read.qxmd.com/read/30697955/a-strategy-for-generating-rice-apomixis-by-gene-editing
#3
En Xie, Yafei Li, Ding Tang, Yanli Lv, Yi Shen, Zhukuan Cheng
Apomixis is an asexual reproduction way of plants that can produce clonal offspring through seeds. In this study, we introduced apomixis into rice (Oryza sativa) by mutating OsSPO11-1, OsREC8, OsOSD1, and OsMATL through a CRISPR/Cas9 system. The quadruple mutant showed a transformation from meiosis to mitosis and produced clonal diploid gametes. With mutated Osmatl, which gives rise to haploid induction in plants, the quadruple mutant is expected to be able to produced apomictic diploid offspring. We named this quadruple mutant as AOP (Apomictic Offspring Producer) for its ability to produce apomictic offspring...
January 30, 2019: Journal of Integrative Plant Biology
https://read.qxmd.com/read/30697937/exportin-1a-prevents-transgene-silencing-in-arabidopsis-by-modulating-nucleo-cytoplasmic-partitioning-of-hda6
#4
Guohui Zhu, Yanan Chang, Xuezhong Xu, Kai Tang, Chunxiang Chen, Mingguang Lei, Jian-Kang Zhu, Cheng-Guo Duan
In eukaryotic cells, transport of macromolecules across the nuclear envelope is an essential process that ensures rapid exchange of cellular components, including protein and RNA molecules. Chromatin regulators involved in epigenetic control are among the molecules exported across the nuclear envelope, but the significance of this nucleo-cytoplasmic trafficking is not well understood. Here, we use a forward screen to isolate XPO1A (a nuclear export receptor in Arabidopsis) as an anti-silencing factor that protects transgenes from transcriptional silencing...
January 30, 2019: Journal of Integrative Plant Biology
https://read.qxmd.com/read/30697936/induction-of-desiccation-tolerance-in-desiccation-sensitive-citrus-limon-seeds
#5
Alexandre Marques, Harm Nijveen, Charles Somi, Wilco Ligterink, Henk Hilhorst
Many economically important perennial species bear recalcitrant seeds, including tea, coffee, cocoa, mango, citrus, rubber, oil palm and coconut. Orthodox seeds can be dried almost completely without losing viability but so-called recalcitrant seeds have a very limited storage life and die upon drying below a higher critical moisture content than orthodox seeds. As a result, the development of long term storage methods for recalcitrant seeds is compromised. Lowering this critical moisture content would be very valuable since dry seed storage is the safest, most convenient and cheapest method for conserving plant genetic resources...
January 30, 2019: Journal of Integrative Plant Biology
https://read.qxmd.com/read/30697935/how-plants-grow-up
#6
REVIEW
Sarah M McKim
A plant's lateral structures, such as leaves, branches and flowers, literally hinge on the shoot axis, making its integrity and growth fundamental to plant form. In all plants, subapical proliferation within the shoot tip displaces cells downwards to extrude the cylindrical stem. Following the transition to flowering, many plants show increased axial elongation with associated increases in subapical proliferation and expansion. However, the stems of grasses, called culms, also elongate due to detached intercalary meristems, which displace cells upwards to elevate the grain-bearing inflorescence...
January 30, 2019: Journal of Integrative Plant Biology
https://read.qxmd.com/read/30697931/an-efficient-tilling-platform-for-cultivated-tobacco
#7
Yu-Long Gao, Xue-Feng Yao, Xiu-Fen Song, Wen-Zheng Li, Zhong-Bang Song, Bing-Wu Wang, Yu-Ping Wu, Jun-Li Shi, Guan-Shan Liu, Yong-Ping Li, Chun-Ming Liu
Targeting-induced local lesions in genomes (TILLING) is a powerful reverse-genetics tool that enables high-throughput screening of genomic variations in plants. Although TILLING has been developed for many diploid plants, the technology has been used in very few polyploid species due to their genomic complexity. Here, we established an efficient capillary electrophoresis-based TILLING platform for allotetraploid cultivated tobacco (Nicotiana tabacum L.) using an ethyl methanesulfonate (EMS)-mutagenized population of 1,536 individuals...
January 30, 2019: Journal of Integrative Plant Biology
https://read.qxmd.com/read/30694021/wheat-and-barley-biology-towards-new-frontiers
#8
EDITORIAL
Thorsten Schnurbusch
Among the approx. 30 genera and 360 species belonging to the tribe Triticeae (subfamily Pooideae, family Poaceae), wheat (Triticum ssp.) and barley (Hordeum vulgare L.) are economically the most important temperate cereal crops. On a global scale in 2016, wheat was ranked second (749 million tons) and barley fourth (141 million tons) in terms of world production (FAO STAT, 2018). A considerable amount of our daily carbohydrates and proteins is contributed by both species. Cereals and bread are the major source of energy for all age groups, providing ∼30% for adults in developed countries, while it can be up to 80% in developing countries (Shewry and Hey 2015)...
January 29, 2019: Journal of Integrative Plant Biology
https://read.qxmd.com/read/30663237/protein-s-nitrosylation-in-plants-current-progresses-and-challenges
#9
REVIEW
Jian Feng, Lichao Chen, Jianru Zuo
Nitric oxide (NO) plays important roles in the regulation of multiple aspects of plant development and stress responses. A major physiological function of NO is executed via protein S-nitrosylation, a redox-based posttranslational modification by covalently adding an NO molecule to a reactive cysteine thiol of a target protein. S-nitrosylation is an evolutionarily conserved mechanism regulating diverse biological processes in all living organisms. During the past decade, significant progresses have been made in functional characterization of S-nitrosylated proteins in plants...
January 21, 2019: Journal of Integrative Plant Biology
https://read.qxmd.com/read/30652411/hydrogen-sulfide-h-2-s-a-novel-component-in-arabidopsis-peroxisomes-which-triggers-catalase-inhibition
#10
Francisco J Corpas, Juan B Barroso, Salvador González-Gordo, María A Muñoz-Vargas, José M Palma
Plant peroxisomes have the capacity to generate different reactive oxygen and nitrogen species (ROS and RNS), such as H2 O2 , superoxide radical (O2  ·   - ), nitric oxide and peroxynitrite (ONOO- ). These organelles have an active nitro-oxidative metabolism which can be exacerbated by adverse stress conditions. Hydrogen sulfide (H2 S) is a new signaling gasotransmitter caused by the posttranslational modification (PTM) persulfidation. We used Arabidopsis thaliana transgenic seedlings expressing cyan fluorescent protein (CFP) fused to a canonical peroxisome targeting signal 1 (PTS1) to visualize peroxisomes in living cells, as well as a specific fluorescent probe which showed that peroxisomes contain H2 S...
January 16, 2019: Journal of Integrative Plant Biology
https://read.qxmd.com/read/30652405/critical-function-of-dna-methyltransferase-1-in-tomato-development-and-regulation-of-the-dna-methylome-and-transcriptome
#11
Yu Yang, Kai Tang, Tatsiana U Datsenka, Wenshan Liu, Suhui Lv, Zhaobo Lang, Xingang Wang, Jinghui Gao, Wei Wang, Wenfeng Nie, Zhaoqing Chu, Heng Zhang, Avtar K Handa, Jian-Kang Zhu, Huiming Zhang
DNA methylation confers epigenetic regulation on gene expression and thereby on various biological processes. Tomato has emerged as an excellent system to study the function of DNA methylation in plant development.To date, regulation and function of DNA methylation maintenance remains unclear in tomato plants. Here we report the critical function of tomato (Solanum lycopersicum) Methyltransferase 1 (SlMET1) in plant development and DNA methylome and transcriptome regulation. Using CRISPR-Cas9 gene editing, we generated slmet1 mutants and observed severe developmental defects with a frame-shift mutation, including small and curly leaves, defective inflorescence, and parthenocarpy...
January 16, 2019: Journal of Integrative Plant Biology
https://read.qxmd.com/read/30637989/a-suvh-dnaj-sdj-protein-complex-activates-the-expression-of-promoter-methylated-genes-in-arabidopsis
#12
Zhizhong Gong
DNA methylation is an epigenetic mark that is involved in regulation of gene expression, gene imprinting, genome stability and many other important biological processes (Zhu 2009; He et al. 2011; Zhang et al. 2018). DNA methylation mark is usually associated with gene silencing when occurring in promoter regions. In plants, DNA methylation can be established and maintained through different DNA methylation pathways, such as RNA-directed DNA methylation (RdDM) pathway; it can also be actively eliminated by ROS1-family mediated DNA demethylation pathway (Zhu 2009; Zhang et al...
January 14, 2019: Journal of Integrative Plant Biology
https://read.qxmd.com/read/30623600/developing-disease-resistant-thermosensitive-male-sterile-rice-by-multiplex-gene-editing
#13
Sanfeng Li, Lan Shen, Ping Hu, Qing Liu, Xudong Zhu, Qian Qian, Kejian Wang, Yuexing Wang
High-quality and disease-resistant male sterile lines have great potential for applications in hybrid rice breeding. We introduced specific mutations into the TMS5, Pi21, and Xa13 genes in Pinzhan intermediate breeding material using the CRISPR/Cas9 multiplex genome editing system. We found that the transgene-free homozygous triple tms5/pi21/xa13 mutants obtained in the T1 generation displayed characteristics of thermosensitive genic male sterility (TGMS) with enhanced resistance to rice blast and bacterial blight...
January 8, 2019: Journal of Integrative Plant Biology
https://read.qxmd.com/read/30623571/micrornas-transcriptionally-regulate-promoter-activity-in-arabidopsis-thaliana
#14
LETTER
Guodong Yang, Yuanyuan Li, Binjiang Wu, Kaiyue Zhang, Lei Gao, Chengchao Zheng
MicroRNAs (miRNAs) are vital regulators that repress gene expression in the cytoplasm in two main ways: mRNA degradation and translational inhibition. Several animal studies have shown that miRNAs also target promoters, thereby activating expression. Whether this miRNA action also occurs in plants is unknown. In this study, we demonstrated that several miRNAs regulate target promoters in Arabidopsis thaliana. For example, miR5658 was predominantly present in the nucleus and activated the expression of AT3G25290 directly by binding to its promoter...
January 8, 2019: Journal of Integrative Plant Biology
https://read.qxmd.com/read/30614629/a-message-to-the-plant-sciences-community
#15
EDITORIAL
Chun-Ming Liu, William Bill Lucas, Wei-Hua Wu, Kang Chong, Zhizhong Gong
On January 1st 2019, a well-planned changeover took place in the management of JIPB. On this date, Prof. Zhizhong Gong at the China Agricultural University, and Prof. Kang Chong at the Institute of Botany, Chinese Academy of Sciences, assumed their roles as Co-Editors-in-Chief. Prof. Wei-Hua Wu has joined the JIPB board as Chief Scientific Advisor from January 1, 2019.
January 7, 2019: Journal of Integrative Plant Biology
https://read.qxmd.com/read/30609316/developmental-pathways-for-shaping-spike-inflorescence-architecture-in-barley-and-wheat
#16
REVIEW
Ravi Koppolu, Thorsten Schnurbusch
Grass species display a wide array of inflorescences ranging from highly branched compound/panicle inflorescences to unbranched spike inflorescences. The unbranched spike inflorescence is a characteristic feature of the species of tribe Triticeae, including economically important crops, such as wheat and barley. In this review, we describe two important developmental genetic mechanisms regulating spike inflorescence architecture in barley and wheat, these include genetic regulation of (i) row-type pathway specific to Hordeum species and (ii) unbranched spike development in barley and wheat...
January 4, 2019: Journal of Integrative Plant Biology
https://read.qxmd.com/read/30609289/plant-peroxisomes-at-the-crossroad-of-no-and-h-2-o-2-metabolism
#17
REVIEW
Francisco J Corpas, Luis A Del Río, José M Palma
Plant peroxisomes are subcellular compartments involved in many biochemical pathways during the life cycle of a plant but also in the mechanism of response against adverse environmental conditions. These organelles have an active nitro-oxidative metabolism under physiological conditions but this could be exacerbated under stress situations. Furthermore, peroxisomes have the capacity to proliferate and also undergo biochemical adaptations depending on the surrounding cellular status. An important characteristic of peroxisomes is that they have a dynamic metabolism of reactive nitrogen and oxygen species (RNS and ROS) which generates two key molecules, nitric oxide (NO) and hydrogen peroxide (H2 O2 )...
January 4, 2019: Journal of Integrative Plant Biology
https://read.qxmd.com/read/30609265/nitric-oxide-%C3%AE-aminobutyric-acid-and-mannose-pretreatment-influence-metabolic-profiles-in-white-clover-under-water-stress
#18
Zhou Li, Bin Yong, Bizhen Cheng, Xing Wu, Yan Zhang, Xinquan Zhang, Yan Peng
Nitric oxide (NO), γ-aminobutyric acid (GABA), and mannose (MAS) could be important regulators of plant growth and adaptation to water stress. The application of sodium nitroprusside (SNP, a NO donor), GABA, and MAS improved plant growth under water-sufficient condition and effectively mitigated water stress damage to white clover. The metabonomic analysis showed that both of SNP and GABA application resulted in a significant increase in myo-inositol content; the accumulation of mannose was commonly regulated by SNP and MAS; GABA and MAS induced the accumulation of aspartic acid, quinic acid, trehalose, and glycerol under water deficit...
January 4, 2019: Journal of Integrative Plant Biology
https://read.qxmd.com/read/30597738/control-of-grain-size-by-g-protein-signaling-in-rice
#19
REVIEW
Ran Xu, Na Li, Yunhai Li
Heterotrimeric G proteins are involved in multiple cellular processes in eukaryotes by sensing and transducing various signals. G-protein signaling in plants is quite different from that in animals, and the mechanisms of plant G-protein signaling are still largely unknown. Several recent studies have provided new insights into the mechanisms of G protein signaling in rice grain size and yield control. In this review, we summarize recent advances on the function of G proteins in rice grain size control, and discuss the potential genetic and molecular mechanisms of plant G-protein signaling...
December 31, 2018: Journal of Integrative Plant Biology
https://read.qxmd.com/read/30589237/a-group-of-suvh-methyl-dna-binding-proteins-regulate-expression-of-the-dna-demethylase-ros1-in-arabidopsis
#20
Xinlong Xiao, Jieqiong Zhang, Tao Li, Xing Fu, Viswanathan Satheesh, Qingfeng Niu, Zhaobo Lang, Jian-Kang Zhu, Mingguang Lei
DNA methylation is typically regarded as a repressive epigenetic mark for gene expression. Genome-wide DNA methylation patterns in plants are dynamically regulated by the opposing activities of DNA methylation and demethylation reactions. In Arabidopsis, a DNA methylation monitoring sequence (MEMS) in the promoter of the DNA demethylase gene ROS1 functions as a methylstat that senses these opposing activities and regulates genome DNA methylation levels by adjusting ROS1 expression. How DNA methylation in the MEMS region promotes ROS1 expression is not known...
December 27, 2018: Journal of Integrative Plant Biology
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