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Plant Cell

Chaobin Li, Yihong Yue, Hanjun Chen, Weiwei Qi, Rentao Song
Zeins are the most abundant storage proteins in maize (Zea mays) kernels, thereby affecting the nutritional quality and texture of this crop. 27-kD γ-zein is highly expressed and plays a crucial role in protein body formation. Several transcription factors (TFs) (O2, PBF1, OHP1 and OHP2) regulate the expression of the 27-kD γ-zein gene, but the complexity of its transcriptional regulation is not fully understood. Here, using probe affinity purification and mass spectrometry analysis, we identified ZmbZIP22, a TF that binds to the 27-kD γ-zein promoter...
September 21, 2018: Plant Cell
Chunmei Zhu, Qiang Peng, Debao Fu, Dongxia Zhuang, Yiming Yu, Min Duan, Weibo Xie, Yaohui Cai, Yidan Ouyang, Xingming Lian, Changyin Wu
The ubiquitin 26S proteasome system (UPS) is critical for enabling plants to alter their proteomes to integrate internal and external signals for the photoperiodic induction of flowering. We previously demonstrated that HAF1, a C3HC4 RING domain-containing E3 ubiquitin ligase, is essential to precisely modulate the timing of Heading Date1 accumulation and to ensure appropriate photoperiodic responses under short-day conditions in rice (Oryza sativa). However, how HAF1 mediates flowering under long-day conditions remains unknown...
September 21, 2018: Plant Cell
Qian Zhang, Zhi Xie, Rui Zhang, Peng Xu, Hongtao Liu, Hong-Quan Yang, Monika Susanne Doblin, Antony Bacic, Laigeng Li
Secondary cell walls (SCWs) are formed in some specific types of cells, providing plants with mechanical strength. During plant growth and development, formation of secondary cell walls is regulated by various developmental and environmental signals, of which the molecular mechanisms are poorly understood. In this study, we analyzed the blue light receptor cry1 mutant of Arabidopsis for its SCW phenotypes. During inflorescence stem growth, SCW thickening in the vasculature was significantly affected by blue light...
September 21, 2018: Plant Cell
Umarah Mubeen, Jessica Juppner, Jessica Alpers, Dirk K Hincha, Patrick Giavalisco
The Target of Rapamycin (TOR) kinase is a central regulator of growth and metabolism in all eukaryotic organisms including animals, fungi and plants. Even though the inputs and outputs of TOR signaling are well characterized for animals and fungi, our understanding of the upstream regulators of TOR and its downstream targets is still fragmentary in photosynthetic organisms. In the present study, we employed the rapamycin-sensitive green alga Chlamydomonas reinhardtii to elucidate the molecular cause of the amino acid accumulation that occurs after rapamycin-induced inhibition of TOR...
September 18, 2018: Plant Cell
Christian Danve Marco Castroverde
No abstract text is available yet for this article.
September 18, 2018: Plant Cell
Yiming Wang, Stefan Schuck, Jingni Wu, Ping Yang, Anne-Christin Doering, Jürgen Zeier, Kenichi Tsuda
Plants induce systemic acquired resistance (SAR) upon localized exposure to pathogens. Pipecolic acid (Pip) production via AGD2-LIKE DEFENSE RESPONSE PROTEIN 1 (ALD1) is key for SAR establishment. Here, we report a positive feedback loop important for SAR induction in Arabidopsis thaliana. We showed that local activation of the MAP kinases MPK3 and MPK6 is sufficient to trigger Pip production and mount SAR. Consistent with this, mutations in MPK3 or MPK6 led to compromised Pip accumulation upon inoculation with the bacterial pathogen Pseudomonas syringae pv...
September 18, 2018: Plant Cell
Alex Harkess
No abstract text is available yet for this article.
September 11, 2018: Plant Cell
Patrice A Salomé
No abstract text is available yet for this article.
September 11, 2018: Plant Cell
Jennifer Mach
No abstract text is available yet for this article.
September 10, 2018: Plant Cell
Jun Yang, Miaomiao Fu, Chen Ji, Yongcai Huang, Yongrui Wu
The organic acid oxalate occurs in microbes, animals and plants; however, excessive oxalate accumulation in vivo is toxic to cell growth and decreases the nutritional quality of certain vegetables. However, the enzymes and functions required for oxalate degradation in plants remain largely unknown. Here, we report the cloning of a maize (Zea mays) opaque endosperm mutant that encodes oxalyl-CoA decarboxylase1 (EC4.1.1.8; OCD1). Ocd1 is generally expressed and is specifically induced by oxalate. The ocd1 mutant seeds contain a significantly higher level of oxalate than the wild type, indicating that the ocd1 mutants have a defect in oxalate catabolism...
September 10, 2018: Plant Cell
Yanwei Cui, Chong Hu, Yafen Zhu, Kaili Cheng, Xiaonan Li, Zhuoyun Wei, Li Xue, Fang Lin, Hongyong Shi, Jing Yi, Suiwen Hou, Kai He, Jia Li, Xiaoping Gou
Appropriate cell division and differentiation ensure normal anther development in angiosperms. BARELY ANY MERISTEM ½ (BAM½) and RECEPTOR-LIKE PROTEIN KINASE 2 (RPK2), two groups of leucine-rich repeat receptor-like protein kinase (LRR-RLK), are required for early anther cell specification. However, little is known about the molecular mechanisms underlying these two RLK-mediated signaling pathways. Here, we show that CLAVATA3 INSENSITIVE RECEPTOR KINASES (CIKs), a group of novel co-receptor protein kinase controlling stem cell homeostasis, play essential roles in BAM½- and RPK2-regulated early anther development in Arabidopsis thaliana...
September 10, 2018: Plant Cell
Li Tian, Hong-Li Chou, Laining Zhang, Seon-Kap Hwang, Shawn Starkenburg, Kelly A Doroshenk, Toshihiro Kumamaru, Thomas W Okita
In developing rice (Oryza sativa) endosperm, mRNAs of the major storage proteins, glutelin and prolamine, are transported and anchored to distinct subdomains of the cortical endoplasmic reticulum. RNA-binding protein RBP-P binds to both glutelin and prolamine mRNAs, suggesting a role in some aspect of their RNA metabolism. Here, we show that rice lines expressing mutant RBP-P mis-localize both glutelin and prolamine mRNAs. Different mutant RBP-P proteins exhibited varying degrees of reduced RNA binding and/or protein-protein interaction properties, which may account for the mis-localization of storage protein RNAs...
September 6, 2018: Plant Cell
Scott A Sinclair, Toralf Senger, Ina N Talke, Chris S Cobbett, Michael J Haydon, Ute Kraemer
Low bioavailable concentrations of the micronutrient zinc (Zn) limit agricultural production on 40% of cultivated land. Here, we demonstrate that plant acclimation to Zn deficiency involves systemic regulation. Physiological Zn deficiency of Arabidopsis thaliana shoots results in increased root transcript levels of the membrane transport protein-encoding genes METAL TRANSPORT PROTEIN 2 (MTP2) and HEAVY METAL ATPASE 2 (HMA2), which are unresponsive to the local Zn status of roots. MTP2 and HMA2 act additively in the partitioning of Zn from roots to shoots...
August 27, 2018: Plant Cell
Daniel Garcia Cabanillas, Jun Jiang, Nooshin Movahed, Hugo Germain, Yasuyuki Yamaji, Huanquan Zheng, Jean-Francois Laliberte
Infection of plant cells by RNA viruses leads to the generation of organelle-like subcellular structures that contain the viral replication complex. During Turnip mosaic virus (TuMV) infection of Nicotiana benthamiana, the viral membrane protein 6K2 plays a key role in the release of motile replication vesicles from the host endoplasmic reticulum (ER). Here, we demonstrate that 6K2 contains a GxxxG motif within its predicted transmembrane domain that is vital for TuMV infection. Replacement of the Gly with Val within this motif inhibited virus production, and this was due to a relocation of the viral protein to the Golgi apparatus and the plasma membrane This indicated that passage of 6K2 through the Golgi apparatus is a dead-end avenue for virus infection...
August 27, 2018: Plant Cell
Byung Ha Lee, Zachary T Weber, Melina Zourelidou, Brigitte T Hofmeister, Robert Schmitz, Claus Schwechheimer, Anna A Dobritsa
Certain regions on the surfaces of developing pollen grains exhibit very limited deposition of pollen wall exine. These regions give rise to pollen apertures, which are highly diverse in their patterns and specific for individual species. Arabidopsis thaliana pollen develops three equidistant longitudinal apertures. The precision of aperture formation suggests that, to create them, pollen employs robust mechanisms that generate distinct cellular domains. To identify players involved in this mechanism, we screened natural Arabidopsis accessions and discovered one accession, Martuba, whose apertures form abnormally due to the disruption of the protein kinase D6PKL3...
August 27, 2018: Plant Cell
Pablo Martinez, Lindy A Allsman, Kenneth A Brakke, Christopher Hoyt, Jordan Hayes, Hong Liang, Wesley Neher, Yue Rui, Allyson M Roberts, Amir Moradifam, Bob Goldstein, Charles T Anderson, Carolyn Rasmussen
One key aspect of cell division in multicellular organisms is the orientation of the division plane. Proper division plane establishment contributes to normal plant body organization. To determine the importance of cell geometry in division plane orientation, we designed a three-dimensional probabilistic mathematical model to directly test the century-old hypothesis that cell divisions mimic soap-film minima. According to this hypothesis, daughter cells have equal volume and the division plane occurs where the surface area is at a minimum...
August 27, 2018: Plant Cell
Jennifer A Lockhart
No abstract text is available yet for this article.
August 27, 2018: Plant Cell
Jennifer A Lockhart
No abstract text is available yet for this article.
August 27, 2018: Plant Cell
Ting-Ting Yuan, Henghao Xu, Qing Zhang, Lin-Yu Zhang, Ying-Tang Lu
Plant seedlings undergo distinct developmental processes in the dark and in the light. Several genes, including ELONGATED HYPOCOTYL 5 (HY5), B-BOX PROTEIN 21 (BBX21), and BBX22, have been identified as photomorphogenesis-promoting factors in Arabidopsis thaliana; however, the overexpression of these genes does not induce photomorphogenesis in the dark. Using an activation-tagging approach, we identified SRS5ox, which overexpresses SHI-RELATED SEQUENCE 5 (SRS5) following induction with estradiol. SRS5 overexpression in SRS5ox and Pro35S:SRS5-GFP seedlings results in a constitutive photomorphogenesis phenotype in the dark, whereas SRS5 loss-of-function in the srs5-2 mutant results in long hypocotyls in the light...
August 27, 2018: Plant Cell
Dana Olivia Robinson, Jeremy E Coate, Abhyudai Singh, Lilan Hong, Maxwell S Bush, Jeff J Doyle, Adrienne H K Roeder
Ploidy and size phenomena are observed to be correlated across several biological scales, from subcellular to organismal. Two kinds of ploidy change can affect plants. Whole-genome multiplication increases ploidy in whole plants and is broadly associated with increases in cell and organism size. Endoreduplication increases ploidy in individual cells. Ploidy increase is strongly correlated with increased cell size and nuclear volume. Here, we investigate scaling relationships between ploidy and size by simultaneously quantifying nuclear size, cell size, and organ size in sepals from an isogenic series of diploid, tetraploid, and octoploid Arabidopsis thaliana plants, each of which contains an internal endopolyploidy series...
August 24, 2018: Plant Cell
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