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Plant Physiology

Zhi-Shan Chen, Xiao-Feng Liu, Dong-Hui Wang, Rui Chen, Xiaolan Zhang, Zhi-Hong Xu, Shu-Nong Bai
This study aimed at elucidating regulatory components behind floral organ identity determination and tissue development. It remains unclear how organ identity proteins facilitate development of organ primordia into tissues with a determined identity, even though it has long been accepted that floral organ identity is genetically determined by interaction of identity genes according to the ABC model. Using the ChIP-seq technique, we identified OsTGA10, encoding a bZIP transcription factor, as a target of the MADS box protein OsMADS8, which is annotated as an E-class organ identity protein...
November 20, 2017: Plant Physiology
Arkadipta Bakshi, Sarbottam Piya, Jessica C Fernandez, Christian Chervin, Tarek Hewezi, Brad Binder
Ethylene is a gaseous plant hormone perceived by a family of receptors in Arabidopsis thaliana including ETHYLENE RESPONSE1 (ETR1) and ETR2. Previously we showed that etr1-6 loss-of-function plants germinate better and etr2-3 loss-of-function plants germinate worse than wild-type under NaCl stress and in response to abscisic acid (ABA). In this study, we expanded these results by showing that ETR1 and ETR2 have contrasting roles in the control of germination under a variety of inhibitory conditions for seed germination such as treatment with KCl, CuSO4, ZnSO4, and ethanol...
November 20, 2017: Plant Physiology
Barbara De Meester, Lisanne de Vries, Merve Özparpucu, Notburga Gierlinger, Sander Corneillie, Andreas Pallidis, Geert Goeminne, Kris Morreel, Michiel De Bruyne, Riet Maria De Rycke, Ruben Vanholme, Wout A Boerjan
Lignocellulosic biomass is recalcitrant towards deconstruction into simple sugars due to the presence of lignin. To render lignocellulosic biomass a suitable feedstock for the bio-based economy, plants can be engineered to have decreased amounts of lignin. However, engineered plants with the lowest amounts of lignin exhibit collapsed vessels and yield penalties. Previous efforts were not able to fully overcome this phenotype, without settling in sugar yield upon saccharification. Here, we reintroduced CINNAMOYL-CoA REDUCTASE 1 (CCR1) expression specifically in the proto- and metaxylem vessel cells of Arabidopsis ccr1 mutants...
November 20, 2017: Plant Physiology
Qiyu Xu, Siyuan Chen, Yunjuan Ren, Shaolin Chen, Johannes Liesche
Sucrose transporters (SUTs) play a key role in the allocation and partitioning of photosynthetically fixed carbon in plants. While a function could be assigned to many members of the SUT family, almost no information is available on their regulation. Here, the transcriptional regulation of SUTs in response to various environmental stimuli in the leaves of five dicots, Arabidopsis, soy bean, potato, tomato and poplar, and four monocots, maize, rice, wheat and barley, was investigated. Extensive data on expression of SUTs in relation to changes of environmental conditions were obtained through a global analysis of 168 transcriptomics data sets...
November 20, 2017: Plant Physiology
Thanin Chantarachot, Julia Bailey-Serres
No abstract text is available yet for this article.
November 20, 2017: Plant Physiology
Dong Wook Lee, Yun-Joo Yoo, Md Abdur Razzak, Inhwan Hwang
Chloroplasts import many preproteins that can be classified based on their physicochemical properties. The cleavable N-terminal transit peptide (TP) of chloroplast preproteins contains all of the information required for import into chloroplasts through Toc/Tic translocons. The question of whether and how the physicochemical properties of preproteins affect TP-mediated import into chloroplasts has not been elucidated. Here, we present evidence that proline residues in TP mediate efficient translocation through the chloroplast envelope membranes for proteins containing transmembrane domains (TMDs) or proteins prone to aggregation...
November 20, 2017: Plant Physiology
Laura J Hantzis, Gretchen E Kroh, Courtney E Jahn, Michael Cantrell, Graham Peers, Marinus Pilon, Karl Ravet
Iron (Fe) is an essential element for plants, utilized in nearly every cellular process. Because the adjustment of uptake under Fe limitation cannot satisfy all demands, plants need to acclimate their physiology and biochemistry, especially in their chloroplasts, which have a high demand for Fe. To investigate if a program exists for the utilization of Fe under deficiency, we analyzed how hydroponically grown Arabidopsis thaliana adjusts its physiology and Fe protein composition in vegetative photosynthetic tissue, during Fe deficiency...
November 17, 2017: Plant Physiology
Thomas A Torode, Rachel E O'Neill, Susan E Marcus, Valerie Cornuault, Sara Pose-Albacete, Rebecca P Lauder, Stjepan Kresimir Kracun, Maja Gro Rydahl, Mathias C F Andersen, William George Tycho Willats, Siobhan Ariel Braybrook, Belinda J Townsend, Mads H Clausen, J Paul Knox
A major question in plant biology concerns the specification and functional differentiation of cell types. This is in the context of constraints imposed by networks of cell walls that both adhere cells and contribute to the form and function of developing organs. Here, we report the identification of a glycan epitope that is specific to phloem sieve element cell walls in several systems. A monoclonal antibody, designated LM26, binds to the cell wall of phloem sieve elements in stems of Arabidopsis thaliana, Miscanthus x giganteus and notably sugar beet (Beta vulgaris) roots where phloem identification is an important factor for the study of phloem unloading of sucrose...
November 17, 2017: Plant Physiology
Gil Feiguelman, Ying Fu, Shaul Yalovsky
No abstract text is available yet for this article.
November 17, 2017: Plant Physiology
Feng Wang, Nan Wu, Luyue Zhang, Golam Jalal Ahammed, Xiaoxiao Chen, Xun Xiang, Jie Zhou, Xiaojian Xia, Kai Shi, Jingquan Yu, Christine H Foyer, Yanhong Zhou
Photoreceptor-mediated light signaling plays a critical role in plant growth, development, and stress responses but its contribution to the spatial regulation of photoinhibition and photoprotection within the canopy remains unclear. Here, we show that low red/far-red (L-R/FR) ratio light conditions significantly alleviate PSII and PSI photoinhibition in the shade leaves of tomato plants. This protection is accompanied by a phytochrome A (phyA)-dependent induction of LONG HYPOCOTYL 5 (HY5). HY5 binds to the promoter of ABA INSENSITIVE 5 (ABI5), triggering RESPIRATORY BURST OXIDASE HOMOLOG1 (RBOH1)-dependent H2O2 production in the apoplast...
November 16, 2017: Plant Physiology
Ricardo Mir, Victoria H Morris, Henrik Buschmann, Carolyn Rasmussen
TANGLED1 (TAN1) and AUXIN-INDUCED-IN-ROOTS 9 (AIR9) are microtubule binding proteins with cortical division site localization in plants. Their function in Arabidopsis thaliana remained unclear because neither tan1 nor air9 single mutants have a strong phenotype. We show that tan1 air9 double mutants have a synergistic phenotype consisting of short, twisted roots that are hypersenstive to a microtubule depolymerizing drug. The tan1 air9 double mutants have significant defects in division plane orientation due to failures in placing the new cell wall at the correct division site...
November 16, 2017: Plant Physiology
Pierre Martre, Anaelle Dambreville
Process-based crop growth models are popular tools to analyze and understand the impact of crop management, genotype by environment interactions, or climate change. The ability to predict leaf area development is critical to predict crop growth, particularly under conditions of limited resources. Here, we aimed at deciphering growth coordination rules between wheat plant organs, i.e. between leaves within a stem, between laminae and sheaths, and between the mainstem and axillary tillers, to model the dynamics of canopy development...
November 15, 2017: Plant Physiology
Agata Daszkowska-Golec
No abstract text is available yet for this article.
November 15, 2017: Plant Physiology
Ruijuan Wang, Jun Zhao, Min Jia, Ni Xu, Shuang Liang, Jingxia Shao, Yafei Qi, Xiayan Liu, Lijun An, Fei Yu
The development of functional chloroplasts relies on the fine coordination of expressions of both nuclear and chloroplast genomes. We have been using the Arabidopsis yellow variegated (var2) leaf variegation mutant as a tool to dissect the regulation of chloroplast development. In this work, we screened for var2 genetic enhancer modifiers termed enhancer of variegation (evr) mutants and report the characterization of the first EVR locus, EVR1. We showed that EVR1 encodes the cytosolic 80S ribosome 40S small subunit protein RPS21B and the loss of EVR1 causes the enhancement of var2 leaf variegation...
November 15, 2017: Plant Physiology
Jiaqi Sun, Huanquan Zheng
The endoplasmic reticulum (ER) is a network of tubules and sheets stretching throughout the eukaryotic cells. The formation of the ER requires homotypic membrane fusion, which is mediated by a family of Dynamin-like GTPase proteins. The Arabidopsis member ROOT HAIR DEFECTIVE3 (RHD3) has been demonstrated to mediate ER membrane fusion, but how exactly RHD3 is involved in the process is still unknown. Here we conducted systemic structure-function analyses of roles of different RHD3 domains in mediating ER fusion...
November 14, 2017: Plant Physiology
Carlisle S Bascom, Peter K Hepler, Magdalena Bezanilla
No abstract text is available yet for this article.
November 14, 2017: Plant Physiology
Shin-Ichi Arimura
No abstract text is available yet for this article.
November 14, 2017: Plant Physiology
Vinh Ngoc Pham, Praveen Kumar Kathare, Enamul Huq
No abstract text is available yet for this article.
November 14, 2017: Plant Physiology
Francesca Paieri, Luca Tadini, Nikolay Manavski, Tatjana Kleine, Roberto Ferrari, Pietro Angelo Morandini, Paolo Pesaresi, Jörg Meurer, Dario Leister
DEAD-box RNA helicases (DBRHs) modulate RNA secondary structure, allowing RNA molecules to adopt the conformations required for interaction with their target proteins. RH50 is a chloroplast-located DBRH that co-localizes and is co-expressed with GUN1, a central factor in chloroplast-to-nucleus signaling. When combined with mutations that impair plastid gene expression (prors1-1, prpl11-1, prps1-1, prps21-1, prps17-1 and prpl24-1), rh50 and gun1 mutations evoke similar patterns of epistatic effects. These observations, together with the synergistic growth phenotype of the double mutant rh50-1 gun1-102, suggest that RH50 and GUN1 are functionally related and that this function is associated with plastid gene expression, in particular ribosome functioning...
November 14, 2017: Plant Physiology
Daniel J Cosgrove
No abstract text is available yet for this article.
November 14, 2017: Plant Physiology
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