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Plant Cell

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https://www.readbyqxmd.com/read/27920339/identification-of-chlorophyll-dephytylase-involved-in-chlorophyll-turnover-in-arabidopsis
#1
Yao-Pin Lin, Meng-Chen Wu, Yee-Yung Charng
Chlorophyll turns over in green organs during photosystem repair and is salvaged via de- and re-phytylation, but the enzyme involved in de-phytylation is unknown. We have identified an Arabidopsis thaliana thylakoid protein with a putative hydrolase domain that can dephytylate chlorophyll in vitro and in vivo. The corresponding locus, CHLOROPHYLL DEPHYTYLASE1 (CLD1), was identified by mapping a semi-dominant, heat-sensitive, missense allele (cld1-1). CLD1 is conserved in oxygenic photosynthetic organisms, sharing structural similarity with pheophytinase, which functions in chlorophyll breakdown during leaf senescence...
December 5, 2016: Plant Cell
https://www.readbyqxmd.com/read/27920338/the-plethora-gene-regulatory-network-guides-growth-and-cell-differentiation-in-arabidopsis-roots
#2
Luca Santuari, Gabino Sanchez-Perez, Marijn Luijten, Bas Rutjens, Inez Terpstra, Lidija Berke, Maartje Gorte, Kalika Prasad, Dongping Bao, Johanna L P M Timmermans-Hereijgers, Kenichiro Maeo, Kenzo Nakamura, Akie Shimotohno, Ales Pencik, Ondřej Novák, Karin Ljung, Sebastiaan van Heesch, Ewart de Bruijn, Edwin Cuppen, Viola Willemsen, Ari Pekka Mähönen, Wolfgang Lukowitz, Berend Snel, Dick de Ridder, Ben Scheres, Renze Heidstra
Organ formation in animals and plants relies on precise control of cell state transitions to turn stem cell daughters into fully differentiated cells. In plants, cells cannot rearrange due to shared cell walls. Thus, differentiation progression and the accompanying cell expansion must be tightly coordinated across tissues. PLETHORA (PLT) transcription factor gradients are unique in their ability to guide the progression of cell differentiation at different positions in the growing Arabidopsis root, which contrasts with well-described transcription factor gradients in animals specifying distinct cell fates within an essentially static context...
December 5, 2016: Plant Cell
https://www.readbyqxmd.com/read/27895227/phosphorylation-of-arf2-relieves-its-repression-of-transcription-of-the-k-transporter-gene-hak5-in-response-to-low-potassium-stress
#3
Shuai Zhao, Mei-Ling Zhang, Tian-Li Ma, Yi Wang
Potassium (K+) plays crucial roles in plant growth and development. In natural environments, K+ availability in soils is relatively low and fluctuating. Transcriptional regulation of K+ transporter genes is one of the most important mechanisms in the plant's response to K+ deficiency. In this study, we demonstrated that the transcription factor ARF2 (Auxin Response Factor 2) modulates the expression of the K+ transporter gene HAK5 (High Affinity K+ transporter 5) in Arabidopsis thaliana. The arf2 mutant plants showed a tolerant phenotype similar to the HAK5-overexpressing lines on low-K+ medium, whose primary root lengths were longer than those of wild-type plants...
November 28, 2016: Plant Cell
https://www.readbyqxmd.com/read/27895226/the-plastoglobule-localized-metallopeptidase-pgm48-is-a-positive-regulator-of-senescence-in-arabidopsis-thaliana
#4
Nazmul H Bhuiyan, Giulia Friso, Elden Rowland, Kristina Majsec, Klaas Jan van Wijk
Plastoglobuli (PG) are thylakoid-associated monolayer lipid particles with a specific proteome of ~30 PG core proteins and isoprenoid- and neutral lipids. During senescence, PG increase in size, reflecting their role in dismantling thylakoid membranes. Here we show that the only PG-localized peptidase, PGM48, positively regulates leaf senescence. We discovered that PGM48 is a member of the M48 peptidase family with PGM48 homologs, forming a clade (M48D) only found in photosynthetic organisms. Unlike the M48A, B, and C clades, members of M48D have no transmembrane domains, consistent with their unique subcellular location in the PG...
November 28, 2016: Plant Cell
https://www.readbyqxmd.com/read/27895225/loss-of-inositol-phosphorylceramide-sphingolipid-mannosylation-induces-plant-immune-responses-and-reduces-cellulose-content-in-arabidopsis
#5
Lin Fang, Toshiki Ishikawa, Emilie A Rennie, Gosia M Murawska, Jeemeng Lao, Jingwei Yan, Alex Yl Tsai, Edward E K Baidoo, Jun Xu, Jay D Keasling, Taku Demura, Maki Kawai-Yamada, Henrik Vibe Scheller, Jenny C Mortimer
Glycosylinositol phosphorylceramides (GIPCs) are a class of glycosylated sphingolipids found in plants, fungi, and protozoa. These lipids are abundant in the plant plasma membrane, forming ~25% of total plasma membrane lipids. Little is known about the function of the glycosylated headgroup, but two recent studies have indicated that they play a key role in plant signaling and defense. Here, we show that a member of glycosyltransferase (GT) family 64, previously named ECTOPICALLY PARTING CELLS1 (EPC1), is likely a Golgi-localized GIPC-specific mannosyl-transferase, which we renamed GIPC MANNOSYL-TRANSFERASE1 (GMT1)...
November 28, 2016: Plant Cell
https://www.readbyqxmd.com/read/27895224/nkd-transcription-factors-are-central-regulators-of-maize-endosperm-development
#6
Bryan C Gontarek, Anjanasree K Neelakandan, Hao Wu, Philip W Becraft
NAKED ENDOSPERM1 (NKD1) and NKD2 are duplicate INDETERMINATE DOMAIN (IDD) transcription factors important for maize (Zea mays) endosperm development. RNAseq analysis of the nkd1 nkd2 mutant endosperm revealed that NKD1 and NKD2 influence 6.4% of the transcriptome in developing aleurone and 6.7% in starchy endosperm. Processes regulated by NKD1 and NKD2 include gene expression, epigenetic functions, cell growth and division, hormone pathways and resource reserve deposition. The NKD1 and NKD2 proteins bind a consensus DNA sequence of TTGTCGT with slightly different properties...
November 28, 2016: Plant Cell
https://www.readbyqxmd.com/read/27895223/retraction-lpa2-is-required-for-efficient-assembly-of-photosystem-ii-in-arabidopsis-thaliana
#7
Lixin Zhang
No abstract text is available yet for this article.
November 28, 2016: Plant Cell
https://www.readbyqxmd.com/read/27895222/correction-a-genome-wide-regulatory-framework-identifies-maize-pericarp-color1-controlled-genes
#8
Erich Grotewold
No abstract text is available yet for this article.
November 28, 2016: Plant Cell
https://www.readbyqxmd.com/read/27895221/correction-rhon1-mediates-a-rho-like-activity-for-transcription-termination-in-plastids-of-arabidopsis-thaliana
#9
Lixin Zhang
No abstract text is available yet for this article.
November 28, 2016: Plant Cell
https://www.readbyqxmd.com/read/27837007/blue-light-and-low-temperature-regulated-cor27-and-cor28-play-roles-in-the-arabidopsis-circadian-clock
#10
Xu Li, Dingbang Ma, Sheen X Lu, Xinyi Hu, Rongfeng Huang, Tong Liang, Tongda Xu, Elaine M Tobin, Hongtao Liu
Light and temperature are two key environmental signals that profoundly affect plant growth and development, but underlying molecular mechanisms of how light and temperature signals affect the circadian clock are largely unknown. Here we report that COR27 and COR28 are regulated not only by low temperatures but also by light signals. COR27 and COR28 are negative regulators of freezing tolerance but positive regulators of flowering, possibly representing a trade-off between freezing tolerance and flowering. Furthermore, loss-of-function mutations in COR27 and COR28 result in period lengthening of various circadian output rhythms and affect central clock gene expression...
November 11, 2016: Plant Cell
https://www.readbyqxmd.com/read/27811015/myb75-phosphorylation-by-mpk4-is-required-for-light-induced-anthocyanin-accumulation-in-arabidopsis
#11
Shengnan Li, Wenyi Wang, Jinlan Gao, Kangquan Yin, Rui Wang, ChengCheng Wang, Morten Petersen, John Mundy, Jin-Long Qiu
Light is a major environmental cue affecting various physiological and metabolic processes in plants. Although plant photoreceptors are well characterized, the mechanisms by which light regulates downstream responses are less clear. In Arabidopsis thaliana, the accumulation of photo-protective anthocyanin pigments is light dependent and the R2R3 MYB transcription factor MYB75/PAP1 regulates anthocyanin accumulation. Here we report that MYB75 interacts with and is phosphorylated by MAP KINASE 4 (MPK4). Their interaction is dependent on MPK4 kinase activity and is required for full function of MYB75...
November 3, 2016: Plant Cell
https://www.readbyqxmd.com/read/27803310/alternative-splicing-substantially-diversifies-the-transcriptome-during-early-photomorphogenesis-and-correlates-with-the-energy-availability-in-arabidopsis
#12
Lisa Hartmann, Philipp Drewe-Boß, Theresa Wießner, Gabriele Wagner, Sascha Geue, Hsin-Chieh Lee, Dominik M Obermüller, Andre Kahles, Jonas Behr, Fabian H Sinz, Gunnar Rätsch, Andreas Wachter
Plants use light as source of energy and information to detect diurnal rhythms and seasonal changes. Sensing changing light conditions is critical to adjust plant metabolism and to initiate developmental transitions. Here we analyzed transcriptome-wide alterations in gene expression and alternative splicing (AS) of etiolated seedlings undergoing photomorphogenesis upon exposure to blue, red, or white light. Our analysis revealed massive transcriptome reprograming as reflected by differential expression of ~20% of all genes and changes in several hundred AS events...
November 1, 2016: Plant Cell
https://www.readbyqxmd.com/read/27803309/draft-assembly-of-elite-inbred-line-ph207-provides-insights-into-genomic-and-transcriptome-diversity-in-maize
#13
Candice Hirsch, Cory D Hirsch, Alex B Brohammer, Megan J Bowman, Ilya Soifer, Omer Barad, Doron Shem-Tov, Kobi Baruch, Fei Lu, Alvaro G Hernandez, Christopher J Fields, Chris L Wright, Klaus Koehler, Nathan M Springer, Edward S Buckler, C Robin Buell, Natalia de Leon, Shawn M Kaeppler, Kevin Childs, Mark A Mikel
Intense artificial selection over the last 100 years has produced elite maize (Zea mays) inbred lines that combine to produce high-yielding hybrids. To further our understanding of how genome and transcriptome variation contribute to the production of high-yielding hybrids, we generated a draft genome assembly of the inbred line PH207 to complement and compare with the existing B73 reference sequence. B73 is a founder of the Stiff Stalk germplasm pool, while PH207 is a founder of Iodent germplasm, both of which have contributed substantially to the production of temperate commercial maize and are combined to make heterotic hybrids...
November 1, 2016: Plant Cell
https://www.readbyqxmd.com/read/27803308/golgi-transport-1b-regulates-protein-export-from-endoplasmic-reticulum-in-rice-endosperm-cells
#14
Yihua Wang, Feng Liu, Yulong Ren, Yunlong Wang, Xi Liu, Wuhua Long, Di Wang, Jianping Zhu, Xiaopin Zhu, Ruonan Jing, Mingming Wu, Yuanyuan Hao, Ling Jiang, Chunming Wang, Haiyang Wang, Yiqun Bao, Jianmin Wan
Coat protein complex II (COPII) mediates the first step of anterograde transport of newly synthesized proteins from the endoplasmic reticulum (ER) to other endomembrane compartments in eukaryotes. A group of evolutionarily conserved proteins (Sar1, Sec23, Sec24, Sec13 and Sec31) constitutes the basic COPII coat machinery; however, the details of how the COPII coat assembly is regulated remain unclear. Here, we report a protein transport mutant of rice (Oryza sativa), named glutelin precursor accumulation4 (gpa4), which accumulates 57-kDa glutelin precursors, and forms two types of ER-derived abnormal structures...
November 1, 2016: Plant Cell
https://www.readbyqxmd.com/read/27760805/the-minimum-open-reading-frame-aug-stop-induces-boron-dependent-ribosome-stalling-and-mrna-degradation
#15
Mayuki Tanaka, Naoyuki Sotta, Yusuke Yamazumi, Yui Yamashita, Kyoko Miwa, Katsunori Murota, Yukako Chiba, Masami Yokota Hirai, Tetsu Akiyama, Hitoshi Onouchi, Satoshi Naito, Toru Fujiwara
Upstream open reading frames (uORFs) are often translated ahead of the main ORF of a gene and regulate gene expression, sometimes in a condition-dependent manner, but such a role for the minimum uORF (hereafter referred to as 'AUG-stop') in living organisms is currently unclear. Here, we show that AUG-stop plays an important role in the boron (B)-dependent regulation of NIP5;1, encoding a boric acid channel required for normal growth under low B conditions in Arabidopsis thaliana. High B enhanced ribosome stalling at AUG-stop, which was accompanied by the suppression of translation and mRNA degradation...
October 19, 2016: Plant Cell
https://www.readbyqxmd.com/read/27760804/the-reverse-transcriptase-rna-maturase-protein-matr-is-required-for-the-splicing-of-various-group-ii-introns-in-brassicaceae-mitochondria
#16
Laure D Sultan, Daria Mileshina, Felix Grewe, Katarzyna Rolle, Sivan Abudraham, Paweł Głodowicz, Adnan Khan Niazi, Ido Keren, Sofia Shevtsov, Liron Klipcan, Jan Barciszewski, Jeffrey P Mower, Andre Dietrich, Oren Ostersetzer
Group II introns are large catalytic RNAs that are ancestrally related to nuclear spliceosomal introns. Sequences corresponding to group II RNAs are found in many prokaryotes and are particularly prevalent within plants organellar genomes. Proteins encoded within the introns themselves (maturases) facilitate the splicing of their own host pre-RNAs. Mitochondrial introns in plants have diverged considerably in sequence and have lost their maturases. In angiosperms, only a single maturase has been retained in the mitochondrial DNA: the matR gene found within NADH dehydrogenase 1 (nad1) intron 4...
October 19, 2016: Plant Cell
https://www.readbyqxmd.com/read/27758895/epidermal-phytochrome-b-inhibits-hypocotyl-negative-gravitropism-non-cell-autonomously
#17
Jaewook Kim, Kijong Song, Eunae Park, Keunhwa Kim, Gabyong Bae, Giltsu Choi
Seedling hypocotyls display negative gravitropism in the dark but agravitropism in the light. The Arabidopsis thaliana pif quadruple mutant (pifQ), which lacks four PHYTOCHROME-INTERACTING FACTORS (PIFs), is agravitropic in the dark. Endodermis-specific expression of PIF1 rescues gravitropism in pifQ mutant seedlings. Since phytochromes induce light responses by inhibiting PIFs and the COP1-SPA ubiquitin E3 ligase complex in the nucleus, we asked whether phyB can cell autonomously inhibit hypocotyl negative gravitropism in the endodermis...
October 6, 2016: Plant Cell
https://www.readbyqxmd.com/read/27634314/swept-away-protein-mobility-in-the-phloem
#18
Jennifer Mach
No abstract text is available yet for this article.
September 15, 2016: Plant Cell
https://www.readbyqxmd.com/read/27758894/characterization-of-a-pipecolic-acid-biosynthesis-pathway-required-for-systemic-acquired-resistance
#19
Pingtao Ding, Dmitrij Rekhter, Yuli Ding, Kirstin Feussner, Lucas Busta, Sven Haroth, Shaohua Xu, Xin Li, Reinhard Jetter, Ivo Feussner, Yuelin Zhang
Systemic acquired resistance (SAR) is an immune response induced in the distal parts of plants following defense activation in local tissue. Pipecolic acid (Pip) accumulation orchestrates SAR and local resistance responses. Here, we report the identification and characterization of SAR-DEFICIENT4 (SARD4), which encodes a critical enzyme for Pip biosynthesis in Arabidopsis thaliana Loss of function of SARD4 leads to reduced Pip levels and accumulation of a Pip precursor, Δ(1)-piperideine-2-carboxylic acid (P2C)...
October 2016: Plant Cell
https://www.readbyqxmd.com/read/27758893/genome-wide-mapping-of-uncapped-and-cleaved-transcripts-reveals-a-role-for-the-nuclear-mrna-cap-binding-complex-in-cotranslational-rna-decay-in-arabidopsis
#20
Xiang Yu, Matthew R Willmann, Stephen J Anderson, Brian D Gregory
RNA turnover is necessary for controlling proper mRNA levels posttranscriptionally. In general, RNA degradation is via exoribonucleases that degrade RNA either from the 5' end to the 3' end, such as XRN4, or in the opposite direction by the multisubunit exosome complex. Here, we use genome-wide mapping of uncapped and cleaved transcripts to reveal the global landscape of cotranslational mRNA decay in the Arabidopsis thaliana transcriptome. We found that this process leaves a clear three nucleotide periodicity in open reading frames...
October 2016: Plant Cell
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