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Molecular Plant

Zhichao Xu, Tianyi Xin, Dorothea Bartels, Ying Li, Wei Gu, Hui Yao, Sai Liu, Haoying Yu, Xiangdong Pu, Jianguo Zhou, Jiang Xu, Caicai Xi, Hetian Lei, Jingyuan Song, Shilin Chen
Resurrection plants, which are the "gifts" of natural evolution, are ideal models for studying genetic basis of plant desiccation tolerance. Here, we report a high-quality genome assembly of 301 Mb for the diploid spike moss Selaginella tamariscina, a primitive vascular resurrection plant. We predicated 27,761 protein-coding genes from the assembled S. tamariscina genome, 11.38% (2363) of which showed significant expression changes in response to desiccation. Approximately 60.58% of the S. tamariscina genome was annotated as repetitive DNA, which is almost 2-fold increase of that in the genome of desiccation-sensitive S...
May 16, 2018: Molecular Plant
Huadong Zhan, Haibo Xiong, Shui Wang, Zhong-Nan Yang
No abstract text is available yet for this article.
May 12, 2018: Molecular Plant
Xiaozhen Huang, Lingyan Hou, Jingjing Meng, Huiwen You, Zhen Li, Zhizhong Gong, Shuhua Yang, Yiting Shi
As sessile organisms, plants encounter a variety of environmental stresses and must optimize their growth for survival. Abscisic acid (ABA) and cytokinin antagonistically regulate many developmental processes and environmental stress responses in plants. However, the molecular mechanism underlying the antagonism remains poorly defined. In this study, we demonstrated that Sucrose nonfermenting1-related kinases SnRK2.2/2.3/2.6, the key kinases of ABA signaling pathway, directly interacted with and phosphorylated type-A response regulator 5 (ARR5), a negative regulator in cytokinin signaling...
May 9, 2018: Molecular Plant
Bin Zhang, Chi Zhang, Congge Liu, Yanping Jing, Yuan Wang, Ling Jin, Lei Yang, Aigen Fu, Jisen Shi, Fugeng Zhao, Wenzhi Lan, Sheng Luan
Manganese (Mn) is an essential catalytic metal in the Mn-cluster that oxidizes water to produce oxygen during photosynthesis. However, the transport protein(s) responsible for Mn2+ import into the chloroplast remains unknown. Here, we report the characterization of Arabidopsis CMT1 (Chloroplast Manganese Transporter 1), an evolutionarily conserved protein in the Uncharacterized Protein Family 0016 (UPF0016), that is required for manganese accumulation into the chloroplast. The CMT1 gene was expressed primarily in green tissues and the CMT1 protein was localized in the inner envelope membrane of the chloroplast...
May 5, 2018: Molecular Plant
Marion Eisenhuta, Natalie Hoecker, Sidsel Birkelund Schmidt, Rubek Merina Basgaran, Samantha Flachbart, Peter Jahns, Tabea Eser, Stefan Geimer, Søren Husted, Andreas P M Weber, Dario Leister, Anja Schneider
The transition metal manganese (Mn) is indispensable for photoautotrophic growth, since photosystem II (PSII) employs an inorganic Mn4 CaO5 cluster for water splitting. Here, we show that the Arabidopsis membrane protein CHLOROPLAST MANGANESE TRANSPORTER 1 (CMT1) is involved in chloroplast Mn homeostasis. CMT1 is the closest homolog of -the previously characterized thylakoid Mn transporter- PHOTOSYNTHESIS AFFECTED MUTANT71 (PAM71). In contrast to PAM71, CMT1 resides at the chloroplast envelope and is ubiquitously expressed...
May 4, 2018: Molecular Plant
Shumin Chen, Feihong Ren, Lei Zhang, Yong Liu, Xuejun Chen, Yuanmei Li, Liang Zhang, Bin Zhu, Pan Zeng, Zaiyun Li, Robert M Larkin, Hanhui Kuang
The mutation types and their corresponding frequencies are difficult to measure in complex genomes. In this study, a high throughput method was developed to identify spontaneous loss-of-function alleles for the resistance gene N and the transgenic avirulence gene P50 in allotetraploid tobacco. A total of 2134 loss-of-function alleles of the N gene were identified after screening 14 million F1 hybrids. Analysis of these mutants showed striking evolutionary patterns for genes in polyploidy. Only 14 of the mutants were caused by spontaneous point mutations or indels, while the others were caused by homeologous recombination (with a frequency of ∼1/12 000) or loss of chromosome (∼1/15 000)...
May 4, 2018: Molecular Plant
Linjie Luo, Jian Zeng, Haijun Wu, Zhaoxia Tian, Zhong Zhao
The classic phytohormone auxin plays essential roles in priming meristematic cell differentiation in the shoot apical meristem to promote lateral organ initiation. Recently, several lines of evidence have suggested that auxin not only is transported to new primordia but also descends in stem cells in the central zone. However, the function of auxin in stem cell regulation has remained elusive. Here, we show that auxin signaling in stem cells is mediated, at least in part, by AUXIN RESPONSE FACTOR5/MONOPTEROS (MP), which directly represses the transcription of DORNROSCHEN/ENHANCER OF SHOOT REGENERATION 1 (DRN/ESR1)...
May 3, 2018: Molecular Plant
Junling Huai, Xinyu Zhang, Jialong Li, Tingting Ma, Ping Zha, Yanjun Jing, Rongcheng Lin
Plants continuously monitor environmental conditions (such as light and temperature) and adjust their growth and development accordingly. The transcription factor PHYTOCHROME-INTERACTING FACTOR4 (PIF4) regulates both light and temperature signaling pathways. Here, we identified ENHANCED PHOTOMORPHOGENIC2 (EPP2) as a new repressor of photomorphogenesis in red, far-red, and blue light. Map-based cloning revealed that EPP2 encodes the SEUSS (SEU) transcription regulator. The C-terminus of SEU has transcriptional activation activity and SEU physically interacts with PIF4...
May 2, 2018: Molecular Plant
Ran Xu, Penggen Duan, Haiyue Yu, Zhengkui Zhou, Baolan Zhang, Ruci Wang, Jing Li, Guozheng Zhang, Shangshang Zhuang, Jia Lyu, Na Li, Tuanyao Chai, Zhixi Tian, Shanguo Yao, Yunhai Li
Grain size is one of the key agronomic traits that determine grain yield in crops. However, the mechanisms underlying grain size control in crops remain elusive. Here we demonstrate that the OsMKKK10-OsMKK4-OsMAPK6 signaling pathway positively regulates grain size and weight in rice. Loss of OsMKKK10 function results in small and light grains, short panicles and semi-dwarf plants, while overexpression of constitutively active OsMKKK10 (CA-OsMKKK10) causes large and heavy grains, long panicles and tall plants in rice...
April 24, 2018: Molecular Plant
Yiqun Xue, Jingjing Xing, Yinglang Wan, Xueqin Lv, Lusheng Fan, Yongdeng Zhang, Kai Song, Li Wang, Xiaohua Wang, Xin Deng, Frantisek Baluska, John M Christie, Jinxing Lin
Phototropin (phot)-mediated signaling initiated by blue light (BL) plays a critical role in optimizing photosynthetic light capture at the plasma membrane (PM) in plants. However, the mechanisms underlying the regulation of phot activity at the PM in response to BL remain largely unclear. In this study, by single-particle tracking and step-wise photobleaching analysis we demonstrated that in the dark phot1-GFP proteins remain in an inactive state and mostly present as a monomer. The phot1-GFP diffusion rate and its dimerization increased in a dose-dependent manner in response to BL...
April 21, 2018: Molecular Plant
Qian Shen, Lida Zhang, Zhihua Liao, Shengyue Wang, Tingxiang Yan, Pu Shi, Meng Liu, Xueqing Fu, Qifang Pan, Yuliang Wang, Zongyou Lv, Xu Lu, Fangyuan Zhang, Weimin Jiang, Yanan Ma, Minghui Chen, Xiaolong Hao, Ling Li, Yueli Tang, Gang Lv, Yan Zhou, Xiaofen Sun, Peter E Brodelius, Jocelyn K C Rose, Kexuan Tang
Artemisia annua, commonly known as sweet wormwood or Qinghao, is a shrub native to China and has long been used for medicinal purposes. A. annua is now cultivated globally as the only natural source of a potent anti-malarial compound, artemisinin. Here, we report a high-quality draft assembly of the 1.74-gigabase genome of A. annua, which is highly heterozygous, rich in repetitive sequences, and contains 63 226 protein-coding genes, one of the largest numbers among the sequenced plant species. We found that, as one of a few sequenced genomes in the Asteraceae, the A...
April 20, 2018: Molecular Plant
Yunfei Wu, Sang-Kyu Lee, Youngchul Yoo, Jinhuan Wei, Suk-Yoon Kwon, Sang-Won Lee, Jong-Seong Jeon, Gynheung An
Sucrose is produced in mesophyll cells and transferred into phloem cells before it is delivered long-distance to sink tissues. However, little is known about how sucrose transport is regulated in plants. Here, we identified T-DNA insertional mutants in Oryza sativa DNA BINDING WITH ONE FINGER 11 (OsDOF11), which is expressed in the vascular cells of photosynthetic organs and in various sink tissues. The osdof11 mutant plants are semi-dwarf and have fewer tillers and smaller panicles. Although sucrose enhanced root elongation in young wild-type (WT) seedlings, this did not occur in osdof11 seedlings due to reduced sucrose uptake...
April 12, 2018: Molecular Plant
Shaopei Gao, Chengcai Chu
No abstract text is available yet for this article.
April 11, 2018: Molecular Plant
Haijiao Wang, Xuelu Wang
No abstract text is available yet for this article.
April 3, 2018: Molecular Plant
Rainer Hedrich, Thomas D Mueller, Dirk Becker, Irene Marten
Plants and animals in endosomes operate TPC1/SV-type cation channels. Although all plant cells functionally express at least one TPC1 gene, and the encoded SV channel was already discovered in the plant vacuole membrane two decades ago, its biological function has remained enigmatic. Recently, the structure of a plant TPC1/SV channel protein was determined. Insights into the 3D topology has now guided site-directed mutation approaches, enabling SV channel structure-function analyses and shed new light on earlier findings...
March 31, 2018: Molecular Plant
Zilong Guo, Wanneng Yang, Yu Chang, Xiaosong Ma, Haifu Tu, Fang Xiong, Ni Jiang, Hui Feng, Chenglong Huang, Peng Yang, Hu Zhao, Guoxing Chen, Hongyan Liu, Lijun Luo, Honghong Hu, Qian Liu, Lizhong Xiong
Understanding how plants respond to drought can benefit drought resistance (DR) breeding. Using a non-destructive phenotyping facility, 51 image-based traits (i-traits) for 507 rice accessions were extracted. These i-traits can be used to monitor drought responses, and evaluate DR. They have high heritability and large variation of drought responses in the natural population. A genome-wide association study (GWAS) of the i-traits and traditional DR traits identified 470 association loci containing some known DR-related genes...
March 31, 2018: Molecular Plant
Fang-Jie Zhao, Xin-Yuan Huang
No abstract text is available yet for this article.
March 31, 2018: Molecular Plant
Ángeles Gómez-Zambrano, Pedro Crevillén, José M Franco-Zorrilla, Juan A López, Jordi Moreno-Romero, Pawel Roszak, Juan Santos-González, Silvia Jurado, Jesús Vázquez, Claudia Köhler, Roberto Solano, Manuel Piñeiro, José A Jarillo
Deposition of the H2A.Z histone variant by the SWR1 complex (SWR1-C) in regulatory regions of specific loci modulates transcription. Characterization of Arabidopsis thaliana mutations in homologs of the yeast SWR1-C has revealed a role for H2A.Z exchange in a variety of developmental processes; nevertheless, the exact composition of the plant SWR1-C and how it is recruited to target genes remains to be established. Here we show that SWC4, the Arabidopsis homolog of the yeast SANT domain protein Swc4/Eaf2, is a DNA-binding protein that interacts with SWR1-C subunits...
March 28, 2018: Molecular Plant
Qing Sun, Xiaogang Liu, Juan Yang, Wenwen Liu, Qingguo Du, Hongqiu Wang, Chunxiang Fu, Wen-Xue Li
Lodging under N-luxury conditions substantially reduces crop yield and seed quality. However, the molecular mechanisms of plant lodging resistance remain largely unclear, especially in maize. We report here that the expression of ZmmiR528, a monocot-specific miRNA, is induced by nitrogen (N) luxury but reduced by N deficiency. Thioacidolysis and acetyl bromide (AcBr) analysis showed that N luxury significantly reduced the generation of H, G, and S monomers and the total lignin content of maize shoots. We further demonstrated that ZmLACCASE3 (ZmLAC3) and ZmLACCASE5 (ZmLAC5) are the targets of ZmmiR528...
March 26, 2018: Molecular Plant
Binbin Shi, Zhi John Lu
No abstract text is available yet for this article.
March 23, 2018: Molecular Plant
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