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Plant Cell

Patrice A Salomé
No abstract text is available yet for this article.
May 22, 2018: Plant Cell
Cristiane P G Calixto, Wenbin Guo, Allan B James, Nikoleta A Tzioutziou, Juan C Entizne, Paige E Panter, Heather Knight, Hugh Nimmo, Runxuan Zhang, John W S Brown
Plants have adapted to tolerate and survive constantly changing environmental conditions by re-programming gene expression. The dynamics of the contribution of alternative splicing (AS) to stress responses are unknown. RNA-sequencing of a time-series of Arabidopsis thaliana plants exposed to cold determines the timing of significant AS changes. This shows a massive and rapid AS response with coincident waves of transcriptional and AS activity occurring in the first few hours of temperature reduction, and further AS throughout the cold...
May 15, 2018: Plant Cell
Eunae Park, Yeojae Kim, Giltsu Choi
Phytochrome B (phyB) inhibits the function of phytochrome-interacting factors (PIFs) by inducing their degradation and sequestration, but the relative physiological importance of these two phyB activities is unclear. In an analysis of published Arabidopsis thaliana phyB mutations, we identified a point mutation in the N-terminal half of phyB (phyBG111D) that abolishes its PIF sequestration activity without affecting its PIF degradation activity. We also identified a point mutation in the phyB C-terminal domain, which, when combined with a deletion of the C-terminal end (phyB990G767R), does the opposite; it blocks PIF degradation without affecting PIF sequestration...
May 15, 2018: Plant Cell
Arthur Poitout, Amandine Crabos, Ivan Petřík, Ondřej Novák, Gabriel Krouk, Benoît Lacombe, Sandrine Ruffel
Plants face temporal and spatial variation in nitrogen (N) availability. This includes heterogeneity in soil nitrate (NO3-) content. To overcome these constraints, plants modify their gene expression and physiological processes to optimize N acquisition. This plasticity relies on a complex long-distance root-shoot-root signaling network that remains poorly understood. We previously showed that cytokinin (CK) biosynthesis is required to trigger systemic N signaling. Here, we performed split-root experiments and used a combination of CK-related mutant analyses, hormone profiling, transcriptomic analysis, NO3- uptake assays, and root growth measurements to gain insight into systemic N signaling in Arabidopsis thaliana...
May 15, 2018: Plant Cell
Li Yang, Hui-Na Wang, Xing-Hui Hou, Yu-Pan Zou, Ting-Shen Han, Xiao-Min Niu, Jie Zhang, Zhong Zhao, Marco Todesco, Sureshkumar Balasubramanian, Ya-Long Guo
Flowering time is an adaptive life history trait. Capsella rubella, a close relative of Arabidopsis thaliana and a young species, displays extensive variation for flowering time but low standing genetic variation due to an extreme bottleneck event, providing an excellent opportunity to understand how phenotypic diversity can occur with a limited initial gene pool. Here, we demonstrate that common allelic variation and parallel evolution at the FLC locus confer variation in flowering time in C. rubella. We show that two overlapping deletions in the 5' UTR region of C...
May 15, 2018: Plant Cell
Robert C Augustine
No abstract text is available yet for this article.
May 10, 2018: Plant Cell
Ohad Roth, John Alvarez, Matan Levy, John L Bowman, Naomi Ori, Eilon Shani
Plants have evolved a unique and conserved developmental program that enables the conversion of leaves into floral organs. Elegant genetic and molecular work has identified key regulators of flower meristem identity. However, further understanding of flower meristem specification has been hampered by redundancy and by pleiotropic effects. The KNOXI transcription factor SHOOT MERISTEMLESS (STM) is a well-characterized regulator of shoot apical meristem maintenance. Arabidopsis thaliana stm loss-of-function mutants arrest shortly after germination, and therefore the knowledge on later roles of STM in later processes, including flower development, is limited...
May 9, 2018: Plant Cell
Ming-Jung Liu, Koichi Sugimoto, Sahra Uygun, Nicholas Panchy, Michael S Campbell, Mark Yandell, Gregg A Howe, Shin-Han Shiu
The evolution of transcriptional regulatory mechanisms is central to how stress response and tolerance differ between species. However, it remains largely unknown how divergence in cis-regulatory sites and, subsequently, transcription factor (TF) binding specificity contribute to stress-responsive expression divergence, particularly between wild and domesticated spe-cies. By profiling wound-responsive gene transcriptomes in wild Solanum pennellii and do-mesticated S. lycopersicum, we found extensive wound-response divergence and identified 493 S...
May 9, 2018: Plant Cell
Michal Breker, Kristi Lieberman, Frederick Cross
We generated a large collection of temperature-sensitive lethal mutants in the unicellular green alga Chlamydomonas reinhardtii, focusing on mutations specifically affecting cell cycle regulation. We used UV mutagenesis and robotically assisted phenotypic screening to isolate candidates. To overcome the bottleneck at the critical step of molecular identification of the causative mutation ('driver'), we developed MAPS-SEQ (Meiosis-Assisted Purifying Selection Sequencing), a multiplexed genetic/bioinformatics strategy...
May 9, 2018: Plant Cell
Jennifer A Lockhart
No abstract text is available yet for this article.
May 8, 2018: Plant Cell
Jennifer Mach
No abstract text is available yet for this article.
May 8, 2018: Plant Cell
Xiaojiang Zheng, Seock Kang, Yanping Jing, Zhijie Ren, Legong Li, Jian-Min Zhou, Gerald Berkowitz, Jisen Shi, Aigen Fu, Wenzhi Lan, Fugeng Zhao, Sheng Luan
The plant elicitor peptides (Peps), a family of damage/danger-associated molecular patterns (DAMPs), are perceived by two receptors, PEPR1 and PEPR2, and contribute to plant defense against pathogen attack and abiotic stress. Here we show that the Peps-PEPR signaling pathway functions in stomatal immunity by activating guard cell anion channels in Arabidopsis thaliana. The mutant plants lacking both PEPR1 and PEPR2 (pepr1 pepr2) displayed enhanced bacterial growth after being sprayed with Pseudomonas syringae pv...
April 30, 2018: Plant Cell
Jianqing Chen, Peng Wang, Barend H J de Graaf, Hao Zhang, Huijun Jiao, Chao Tang, Shaoling Zhang, Juyou Wu
S-RNase is the female determinant of self-incompatibility (SI) in pear (Pyrus bretschneideri). After translocation to the pollen tube, S-RNase degrades rRNA and induces pollen tube death in an S-haplotype-specific manner. In this study, we found that the actin cytoskeleton is a target of P. bretschneideri S-RNase (PbrS-RNase) and uncovered a mechanism that involves phosphatidic acid (PA) and protects the pollen tube from PbrS-RNase cytotoxicity. PbrS-RNase interacts directly with PbrActin1 in an S-haplotype-independent manner, causing the actin cytoskeleton to depolymerize and promoting programmed cell death in the self-incompatible pollen tube...
April 30, 2018: Plant Cell
Lingya Yao, Xuan Cheng, Zongying Gu, Wei Huang, Shou Li, Linbo Wang, Yong-Fei Wang, Ping Xu, Hong Ma, Xiaochun Ge
Abscisic acid (ABA) regulates plant stress responses and development. However, how the ABA signal is transmitted in response to stresses remains largely unclear, especially in monocots. In this study, we found that rice (Oryza sativa) OsPM1 (PLASMA MEMBRANE PROTEIN 1), encoded by a gene of AWPM-19 like family, mediates ABA influx through the plasma membrane. OsPM1 is predominantly expressed in vascular tissues, guard cells and mature embryos. Phenotypic analysis of overexpression, RNA interference (RNAi), and knock out (KO) lines showed that OsPM1 is involved in drought responses and seed germination regulation...
April 30, 2018: Plant Cell
Lian-Huan Wei, Peizhe Song, Ye Wang, Zhike Lu, Qian Tang, Qiong Yu, Yu Xiao, Xiao Zhang, Hong-Chao Duan, Guifang Jia
The epitranscriptomic mark N6-methyladenosine (m6A) can be written, read, and erased via the action of a complex network of proteins. m6A-binding proteins read m6A marks and transduce their downstream regulatory effects by altering RNA metabolic processes. The characterization of m6A readers is an essential prerequisite for understanding the roles of m6A in plants, but the identities of m6A readers have been unclear. Here, we characterized the YTH-domain family protein ECT2 as an Arabidopsis thaliana m6A reader whose m6A-binding function is required for normal trichome morphology...
April 30, 2018: Plant Cell
Kathleen L Farquharson
No abstract text is available yet for this article.
April 30, 2018: Plant Cell
Peter Ulvskov, Jesper Harholt
No abstract text is available yet for this article.
April 25, 2018: Plant Cell
Xuan Lu, Juan Zhang, Benjamin Brown, Riqing Li, Julio Rodríguez-Romero, Aileen Berasategui, Bo Liu, Meimei Xu, Dangping Luo, Zhiqiang Pan, Scott Baerson, Jonathan Gershenzon, Zhaohu Li, Ane Sesma, Bing Yang, Reuben J Peters
Among their responses to microbial infection, plants deploy an arsenal of natural antibiotic products. These historically have been identified on the basis of their antibiotic activity in vitro, which leaves open the question of their relevance to defense in planta. The vast majority of such natural products from the important crop plant rice (Oryza sativa) are diterpenoids whose biosynthesis proceeds via either ent- or syn- copalyl diphosphate (CPP) intermediates, and which were isolated on the basis of their antibiotic activity against the fungal blast pathogen Magnaporthe oryzae...
April 24, 2018: Plant Cell
Shoji Segami, Takaaki Tomoyama, Shingo Sakamoto, Shizuka Gunji, Mayu Fukuda, Satoru Kinoshita, Nobutaka Mitsuda, Ali Ferjani, Masayoshi Maeshima
Inorganic pyrophosphate (PPi) is a phosphate donor and energy source. Many metabolic reactions that generate PPi are suppressed by high levels of PPi. Here, we investigated how proper levels of cytosolic PPi are maintained, focusing on soluble pyrophosphatases (AtPPa1 to AtPPa5; hereafter PPa1 to PPa5) and vacuolar H+-pyrophosphatase (H+-PPase, AtVHP1/FUGU5) in Arabidopsis thaliana. In planta, five PPa isozymes tagged with GFP were detected in the cytosol and nuclei. Immunochemical analyses revealed high abundance of PPa1 and the absence of PPa3 in vegetative tissue...
April 24, 2018: Plant Cell
Alison W Roberts, Jelle Lahnstein, Yves S Y Hsieh, Xiaohui Xing, Kuok Yap, Arielle M Chaves, Tess R Scavuzzo-Duggan, George Dimitroff, Andrew Lonsdale, Eric M Roberts, Vincent Bulone, Geoffrey B Fincher, Monika Susanne Doblin, Antony Bacic, Rachel A Burton
Mixed-linkage (1,3;1,4)-β-glucan (MLG), an abundant cell wall polysaccharide in the Poaceae, has been detected in ascomycetes, algae, and seedless vascular plants, but not in eudicots. Although MLG has not been reported in bryophytes, a predicted glycosyltransferase from the moss Physcomitrella patens (Pp3c12_24670) is similar to a bona fide ascomycete MLG synthase. We tested whether Pp3c12_24670 encodes an MLG synthase by expressing it in wild tobacco (Nicotiana benthamiana) and testing for release of diagnostic oligosaccharides from the cell walls by either lichenase or (1,4)-β-glucan endohydrolase...
April 19, 2018: Plant Cell
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