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Plant Cell

Piotr Walerowski, André Gündel, Nazariyah Yahaya, William Truman, Miroslaw Sobczak, Marcin Olszak, Stephen A Rolfe, Ljudmilla Borisjuk, Robert Malinowski
Successful biotrophic plant pathogens can divert host nutrition towards infection sites. Here we describe how the protist Plasmodiophora brassicae establishes a long-term feeding relationship with its host by stimulating phloem differentiation and phloem-specific expression of sugar transporters within developing galls. Development of galls in infected Arabidopsis thaliana plants is accompanied by stimulation of host BREVIS RADIX (BRX), COTYLEDON VASCULAR PATTERN 2 (CVP2) and OCTOPUS (OPS) gene expression leading to an increase in phloem complexity...
November 9, 2018: Plant Cell
Robert Schaefer, Jean-Michel Michno, Joseph Jeffers, Owen A Hoekenga, Brian P Dilkes, Ivan R Baxter, Chad Myers
Genome-wide association studies (GWAS) have identified loci linked to hundreds of traits in many different species. Yet, because linkage equilibrium implicates a broad region surrounding each identified locus, the causal genes often remain unknown. This problem is especially pronounced in non-human, non-model species where functional annotations are sparse and there is frequently little information available for prioritizing candidate genes. We developed a computational approach, Camoco, that integrates loci identified by GWAS with functional information derived from gene co-expression networks...
November 9, 2018: Plant Cell
Jennifer A Lockhart
No abstract text is available yet for this article.
November 1, 2018: Plant Cell
Timothy Jegla, Gregory W Busey, Sarah M Assmann
Plant voltage-gated K+ channels have been referred to as "plant Shakers" in reference to animal Shaker channels, the first K+ channels identified. Recent advances in our knowledge of K+ channel evolution and structure have significantly deepened the divide between these plant and animal K+ channels, suggesting that it is time to completely retire the "plant Shaker" designation. Evolutionary genomics reveals that plant voltage-gated K+ channels and metazoan Shakers derive from distinct prokaryotic ancestors...
November 1, 2018: Plant Cell
Linhan Sun, Justin S Williams, Shu Li, Lihua Wu, Wasi A Khatri, Patrick G Stone, Matthew D Keebaugh, Teh-Hui Kao
Self-incompatibility (SI) in Petunia is regulated by a polymorphic S-locus. For each S-haplotype, the S-locus contains a pistil-specific S-RNase gene and multiple pollen-specific S-locus F-box (SLF) genes. Both gain-of-function and loss-of-function experiments have shown that S-RNase alone regulates pistil specificity in SI. Gain-of-function experiments on SLF genes suggest that the entire suite of encoded proteins constitute the pollen specificity determinant. However, clear-cut loss-of-function experiments must be performed to determine if SLF proteins are essential for SI of pollen...
October 29, 2018: Plant Cell
Smrutisanjita Behera, Zhaolong Xu, Laura Luoni, Cristina Bonza, Fabrizio Gandolfo Doccula, Maria Ida DeMichelis, Richard J Morris, Markus Schwarzländer, Alex Costa
Calcium ions (Ca2+) play a key role in cell signaling across organisms. The question of how a simple ion can mediate specificity has spurred research into the role of Ca2+ signatures and their encoding and decoding machinery. Such studies have frequently focussed on Ca2+ alone and our understanding of how Ca2+ signalling is integrated with other responses remains poorly understood. Using in vivo imaging with different genetically-encoded fluorescent sensors in Arabidopsis cells we show that Ca2+ transients do not occur in isolation but are accompanied by pH changes in the cytosol...
October 29, 2018: Plant Cell
Emily Breeze
No abstract text is available yet for this article.
October 29, 2018: Plant Cell
Meng Yang, Kai Lu, Fang-Jie Zhao, Weibo Xie, Priya Ramakrishna, Guangyuan Wang, Qingqing Du, Limin Liang, Cuiju Sun, Hu Zhao, Zhanyi Zhang, Zonghao Liu, Jingjing Tian, Xin-Yuan Huang, Wensheng Wang, Huaxia Dong, Jintao Hu, Luchang Ming, Yongzhong Xing, Gongwei Wang, Jinghua Xiao, David E Salt, Xingming Lian
Rice (Oryza sativa) is an important dietary source of both the essential micronutrients and the toxic trace elements to humans. The genetic basis underlying the variations in the mineral composition, the ionome, in rice remains largely unknown. Here, we describe a comprehensive study of the genetic architecture of the variation in rice ionome by performing genome-wide association studies (GWAS) on the concentrations of 17 mineral elements in rice grain from a diverse panel of 529 accessions each genotyped at approximately 6...
October 29, 2018: Plant Cell
Kathleen L Farquharson
No abstract text is available yet for this article.
October 29, 2018: Plant Cell
Estee E-Ling Tee
No abstract text is available yet for this article.
October 29, 2018: Plant Cell
Robert VanBuren, Ching Man Wai, Jeremy Pardo, Valentino Giarola, Stefano Ambrosini, Xiaomin Song, Dorothea Bartels
Though several resurrection plant genomes have been sequenced, the lack of suitable dehydration-sensitive outgroups has limited genomic insights into the origin of desiccation tolerance. Here, we utilized a comparative system of closely related desiccation-tolerant (Lindernia brevidens) and -sensitive (L. subracemosa) species to identify gene and pathway level changes associated with the evolution of desiccation tolerance. The two high-quality Lindernia genomes we assembled are largely collinear and over 90% of genes are conserved...
October 25, 2018: Plant Cell
Rosa Micol-Ponce, Raquel Sarmiento-Manus, Alejandro Ruiz-Bayón, Charlotte Montacié, Julio Saez-Vasquez, Maria Rosa Ponce
Ribosome biogenesis is fundamental to growth and development in eukaryotes and is linked to human diseases and cancer. Arabidopsis thaliana MORPHOLOGY OF ARGONAUTE1-52 SUPPRESSED 2 (MAS2) participates in splicing and 45S ribosomal DNA (rDNA) expression. In a screen for MAS2 interactors, we identified RIBOSOMAL RNA PROCESSING 7 (RRP7), an ortholog of yeast ribosomal RNA processing protein 7 (Rrp7), which is required for 18S ribosomal RNA (rRNA) maturation. Arabidopsis rrp7 mutants exhibit a pleiotropic phenotype including slow growth, altered shoot phyllotaxy, aberrant venation in lateral organs, partial infertility, and abscisic acid hypersensitivity in seedlings...
October 25, 2018: Plant Cell
Maija Sierla, Hanna Hõrak, Kirk Overmyer, Cezary Waszczak, Dmitry Yarmolinsky, Tobias Maierhofer, Julia P Vainonen, Konstantin Denessiouk, Jarkko Salojärvi, Kristiina Laanemets, Kadri Tõldsepp, Triin Vahisalu, Adrien Gauthier, Tuomas Puukko, Lars Paulin, Petri Auvinen, Dietmar Geiger, Rainer Hedrich, Hannes Kollist, Jaakko Kangasjärvi
Guard cells control the aperture of stomatal pores to balance photosynthetic carbon dioxide uptake with evaporative water loss. Stomatal closure is triggered by several stimuli that initiate complex signaling networks to govern the activity of ion channels. Activation of SLOW ANION CHANNEL1 (SLAC1) is central to the process of stomatal closure and requires the leucine-rich repeat receptor-like kinase (LRR-RLK) GUARD CELL HYDROGEN PEROXIDE-RESISTANT1 (GHR1), among other signaling components. Here, based on functional analysis of nine Arabidopsis thaliana ghr1 mutant alleles identified in two independent forward-genetic ozone-sensitivity screens, we found that GHR1 is required for stomatal responses to apoplastic reactive oxygen species, abscisic acid, high CO2 concentrations, and diurnal light/dark transitions...
October 25, 2018: Plant Cell
Kathleen L Farquharson
No abstract text is available yet for this article.
October 19, 2018: Plant Cell
Chenna Swetha, Debjani Basu, Kannan Pachamuthu, Varsha Tirumalai, Ashwin Nair, Melvin Prasad, Padubidri V Shivaprasad
Domestication of rice included conversion of perennial wild species with few seeds to short plants that produced abundant seeds. Most domestication-associated changes were due to variations in transcription factors and other key genes such as enzymes. Here, we show that multiple yield-related traits associated with indica rice domestication are linked to micro (mi) RNA mediated regulation. Analysis of small (s) RNA datasets from cultivated indica rice lines, a few landraces and two wild relatives of rice revealed the presence of abundant 22-nucleotide (nt) reads in wild relatives that mapped to miR397 precursors...
October 19, 2018: Plant Cell
Yanmin Zou, Shuangfeng Wang, Yuanyuan Zhou, Jiaojiao Bai, Guozhong Huang, Xiaotong Liu, Yingying Zhang, Dingzhong Tang, Dongping Lu
Innate immunity plays a vital role in protecting plants and animals from pathogen infections. Immunity varies with age in both animals and plants. However, little is known about the ontogeny of plant innate immunity during seedling development. We report here that the Arabidopsis thaliana microRNA miR172b regulates the transcription of the immune receptor gene FLAGELLIN-SENSING 2 (FLS2) through TARGET OF EAT1 (TOE1) and TOE2, which directly bind to the FLS2 promoter and inhibit its activity. The level of miR172b is very low in the early stage of seedling development, but increases over time, which results in decreased TOE½ protein accumulation and, consequently, increased FLS2 transcription and the ontogeny of FLS2-mediated immunity during seedling development...
October 18, 2018: Plant Cell
Yuto Takenaka, Yoichiro Watanabe, Mathias Schuetz, Faride Unda, Joseph Lee Hill, Pawittra Phookaew, Arata Yoneda, Shawn D Mansfield, A Lacey Samuels, Misato Ohtani, Taku Demura
The secondary cell wall (SCW) of xylem vessel cells provides rigidity and strength that enables efficient water conduction throughout the plant. To gain insight into SCW deposition, we mutagenized Arabidopsis thaliana VASCULAR-RELATED NAC-DOMAIN7-inducible plant lines, in which ectopic protoxylem vessel cell differentiation is synchronously induced. The baculites mutant was isolated based on the absence of helical SCW patterns in ectopically-induced protoxylem vessel cells, and mature baculites plants exhibited an irregular xylem (irx) mutant phenotype in mature plants...
October 18, 2018: Plant Cell
Zhicheng Zhang, Heleen Coenen, Philip Ruelens, Rashmi Rekha Hazarika, Tareq Al Hindi, Georgiana Kae Oguis, Anja Vandeperre, Vera van Noort, Koen Geuten
The evolution of plants is characterized by whole genome duplications, sometimes closely associated with the origin of large groups of species. The gamma (γ) genome triplication occurred at the origin of the core eudicots, which comprise about 75% of flowering plants. To better understand the impact of whole genome duplication, we studied the protein interaction network of MADS-domain transcription factors, which are key regulators of reproductive development. We reconstructed, synthesized and tested the interactions of ancestral proteins immediately before and closely after the triplication and directly compared these ancestral networks to the extant networks of Arabidopsis thaliana and tomato (Solanum lycopersicum)...
October 17, 2018: Plant Cell
Zi-Qing Miao, Ping-Xia Zhao, Jieli Mao, Linhui Yu, Yang Yuan, Hui Tang, Zhen-Bang Liu, Chengbin Xiang
The gaseous hormone ethylene participates in many physiological processes in plants. Ethylene-inhibited root elongation involves PIN-FORMED2 (PIN2)-mediated basipetal auxin transport, but the molecular mechanisms underlying the regulation of PIN2 function by ethylene (and therefore auxin distribution) are poorly understood. Here, we report that the plant-specific and ethylene-responsive HD-Zip gene HB52 is involved in ethylene-mediated inhibition of primary root elongation in Arabidopsis thaliana. Biochemical and genetic analyses demonstrated that HB52 is ethylene responsive and acts downstream of ETHYLENE-INSENSITIVE3 (EIN3)...
October 17, 2018: Plant Cell
Vijayapalani Paramasivan, Tarek Hewezi, Frederic Pontvianne, Thomas J Baum
Cyst nematodes are plant-pathogenic animals that secrete effector proteins into plant root cells to alter host gene expression and reprogram these cells to form specialized feeding sites, known as syncytia. The molecular mechanisms of these effectors are mostly unknown. We determined that the sugar beet cyst nematode (Heterodera schachtii) 32E03 effector protein strongly inhibits the activities of Arabidopsis thaliana histone deacetylases including the HDT1 enzyme, which has a known function in the regulation of rRNA gene expression through chromatin modifications...
October 17, 2018: Plant Cell
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