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Journal of Integrative Plant Biology

Tongjun Sun, Wanwan Liang, Yuelin Zhang, Xin Li
Salicylic acid (SA) is an essential defence hormone in plants. Induced biosynthesis of SA, upon pathogen infection, is mediated by Isochorismate synthase 1 (ICS1), whose gene transcription is controlled mainly through two redundant transcription factors, SAR Deficient 1 (SARD1) and Calmodulin-binding protein 60-like g (CBP60g). Although these master transcription factors regulate not only positive, but also negative regulators of immunity, how they control signaling events downstream of different immune receptors is unclear...
July 14, 2018: Journal of Integrative Plant Biology
Tianhua He, Byron B Lamont, Neal J Enright, Haylee M D'Agui, William Stock
Trait divergence between populations is considered an adaptive response to different environments, but to what extent this response is accompanied by genetic differentiation is less clear since it may be phenotypic plasticity. In this study, we analysed phenotypic variation between two Banksia attenuata growth forms, lignotuberous (shrub) and epicormic resprouting (tree), in fire-prone environments to identify the environmental factors that have driven this phenotypic divergence. We linked genotype with phenotype and traced candidate genes using differential gene expression analysis...
July 11, 2018: Journal of Integrative Plant Biology
Gang Xu, Zhimin Jiang, Haiyang Wang, Rongcheng Lin
Circadian clock is the endogenous time-keeping machinery that synchronizes an organism's metabolism, behavior, and physiology to the daily light-dark cicles, thereby contributing to organismal fitness. Iron (Fe) is an essential micronutrient for all organisms and it plays important roles in diverse processes of plant growth and development. Here, we show that, in Arabidopsis thaliana, loss of the central clock genes, CIRCADIAN CLOCK ASSOCIATED 1 (CCA1) and LATE ELONGATED HYPOCOTYL (LHY), results in both reduced Fe uptake and photosynthetic efficiency, whereas CCA1 overexpression confers the opposite effects...
July 10, 2018: Journal of Integrative Plant Biology
Ming He, Miao Lan, Baocai Zhang, Yihua Zhou, Youqun Wang, Lei Zhu, Ming Yuan, Ying Fu
Cell-wall deposition of cellulose microfibrils is essential for plant growth and development. In plant cells, cellulose synthesis is accomplished by cellulose synthase complexes located in the plasma membrane. Trafficking of the complex between endomembrane compartments and the plasma membrane is vital for cellulose biosynthesis; however, the mechanism for this process is not well understood. We here report that, in Arabidopsis thaliana, Rab-H1b, a Golgi-localized small GTPase, participates in the trafficking of CELLULOSE SYNTHASE 6 (CESA6) to the plasma membrane...
July 5, 2018: Journal of Integrative Plant Biology
Wei Fan, Jia Meng Xu, Pei Wu, Zhi Xin Yang, He Qiang Lou, Wei Wei Chen, Jian Fen Jin, Shao Jian Zheng, Jian Li Yang
Under conditions of aluminum (Al) toxicity, which severely inhibits root growth in acidic soils, plants rapidly alter their gene expression to optimize physiological fitness for survival. Abscisic acid (ABA) has been suggested as a mediator between Al stress and gene expression, but the underlying mechanisms remain largely unknown. Here, we investigated ABA-mediated Al-stress responses, using integrated physiological and molecular biology approaches. We demonstrate that Al stress caused ABA accumulation in the root apex of rice bean (Vigna umbellata), which positively regulated Al tolerance...
July 5, 2018: Journal of Integrative Plant Biology
Yue Cai, Wenwei Zhang, Jie Jin, Xiaoming Yang, Xiaoman You, Haigang Yan, Liang Wang, Jie Chen, Jiahuan Xu, Weiwei Chen, Xingang Chen, Jing Ma, Xiaojie Tang, Fei Kong, Xiaopin Zhu, Guoxiang Wang, Ling Jiang, William Terzaghi, Chunming Wang, Jianmin Wan
Pyruvate kinase (PK) is a key enzyme in glycolysis and carbon metabolism. Here, we isolated a rice (Oryza sativa) mutant, w59, with a white-core floury endosperm. Map-based cloning of w59 identified a mutation in OsPKpα1, which encodes a plastidic isoform of PK (PKp). OsPKpα1 localizes to the amyloplast stroma in the developing endosperm, and the mutation of OsPKpα1 in w59 decreases the plastidic PK activity, resulting in dramatic changes to the lipid biosynthesis in seeds. The w59 grains were also characterized by a marked decrease in starch content...
June 26, 2018: Journal of Integrative Plant Biology
Huimin Liu, Yan Lu, Juan Wang, Jingjing Hu, Tana Wuyun
Increasing evidence indicates that long non-coding RNAs (lncRNAs) play pivotal roles in regulatory networks controlling plant and animal gene expression. However, the roles of lncRNAs in regulating rubber biosynthesis in Eucommia ulmoides, an emerging source of natural rubber (Eu-rubber), are currently unknown. Here, we performed deep RNA sequencing of two parts of E. ulmoides fruits at two developmental time points. Using a stringent pipeline, we identified 29,103 lncRNAs and 9,048 transcripts of uncertain coding potential (TUCPs)...
June 26, 2018: Journal of Integrative Plant Biology
Youjun Zhang, Alisdair R Fernie
The tricarboxylic acid (TCA) cycle is one of the canonical energy pathways of living systems, as well as being an example of a pathway in which dynamic enzyme assemblies, or metabolons, are well characterized. The role of the enzymes have been the subject of saturated transgenesis approaches, whereby the expression of the constituent enzymes were reduced or knocked out in order to ascertain their in vivo function. Some of the resultant plants exhibited improved photosynthesis and plant growth, under controlled greenhouse conditions...
June 19, 2018: Journal of Integrative Plant Biology
Yongqing Yang, Yan Guo
Salt stress is a major environmental factor limiting plant growth and productivity. A better understanding of the mechanisms mediating salt resistance will help researchers design ways to improve crop performance under adverse environmental conditions. Salt stress can lead to ionic stress, osmotic stress, and secondary stresses, particularly oxidative stress, in plants. Therefore, to adapt to salt stress, plants rely on signals and pathways that re-establish cellular ionic, osmotic, and reactive oxygen species (ROS) homeostasis...
June 15, 2018: Journal of Integrative Plant Biology
Pavan Kumar, Etzel Garrido, Kun Zhao, Yi Zheng, Saleh Alseekh, Erandi Vargas-Ortiz, Alisdair R Fernie, Zhangjun Fei, Katja Poveda, Georg Jander
In response to infestation with larvae of the Guatemalan tuber moth (Tecia solanivora), some Solanum tuberosum (potato) varieties exhibit an overcompensation response, whereby the total dry mass of uninfested tubers is increased. Here, we describe early responses, within the first few days, of T. solanivora feeding, in the Colombian potato variety Pastusa Suprema. Non-targeted metabolite profiling showed significant secondary metabolism changes in T. solanivora-infested tubers, but not in uninfested systemic tubers...
June 11, 2018: Journal of Integrative Plant Biology
Ronghui Pan, Sigrun Reumann, Piotr Lisik, Stefanie Tietz, Laura J Olsen, Jianping Hu
Peroxisomes compartmentalize a dynamic suite of biochemical reactions and play a central role in plant metabolism, such as the degradation of hydrogen peroxide, metabolism of fatty acids, photorespiration, and the biosynthesis of plant hormones. Plant peroxisomes have been traditionally classified into three major subtypes, and in-depth mass spectrometry (MS)-based proteomics has been performed to explore the proteome of the two major subtypes present in green leaves and etiolated seedlings. Here, we carried out a comprehensive proteome analysis of peroxisomes from Arabidopsis leaves given a 48-h dark treatment...
June 7, 2018: Journal of Integrative Plant Biology
Huiyan Guo, Liuqiang Wang, Chuanping Yang, Yiming Zhang, Chunrui Zhang, Chao Wang
Transcription factors (TFs) play vital roles in various biological processes by binding to cis-acting elements to control expressions of their target genes. The MYB TF BplMYB46, from Betula platyphylla, is involved in abiotic stress responses and secondary wall deposition. In the present study, we used a TF-centered yeast one-hybrid technology (TF-centered Y1H) to identify the cis-acting elements bound by BplMYB46. We screened a short-insert random library and identified three cis-elements bound by BplMYB46: an E-box (CA(A/T/C)(A/G/C)TG) and two novel motifs, a TC-box (T(G/A)TCG(C/G)) and a GT-box (A(G/T)T(A/C)GT(T/G)C)...
June 7, 2018: Journal of Integrative Plant Biology
Chengqi Li, Yuanyuan Wang, Nijiang Ai, Yue Li, Jiafeng Song
Genome-wide association studies (GWAS) efficiently identify genetic loci controlling traits at a relatively high resolution. In this study, variations in major early-maturation traits, including seedling period (SP), bud period (BP), flower and boll period (FBP), and growth period (GP), of 169 upland cotton accessions were investigated, and a GWAS of early maturation was performed based on a CottonSNP80K array. A total of 49,650 high-quality single-nucleotide polymorphisms (SNPs) were screened, and 29 significant SNPs located on chromosomes A6, A7, A8, D1, D2, and D9, were repeatedly identified as associated with early-maturation traits, in at least two environments or two algorithms...
June 7, 2018: Journal of Integrative Plant Biology
Lucas Alves Neubus Claus, Daniel V Savatin, Eugenia Russinova
Plants deploy numerous plasma membrane receptors to sense and rapidly react to environmental changes. Correct localization and adequate protein levels of the cell-surface receptors are critical for signaling activation and modulation of plant development and defense against pathogens. After ligand binding, receptors are internalized for degradation and signaling attenuation. However, one emerging notion is that the ligand-induced endocytosis of receptor complexes is important for the signaling duration, amplitude, and specificity...
June 7, 2018: Journal of Integrative Plant Biology
Ningning Zhang, Yongpeng Ma, Ryan A Folk, Jiaojun Yu, Yuezhi Pan, Xun Gong
The key process in speciation concerns the formation and maintenance of reproductive isolating barriers between diverging lineages. Although species boundaries are frequently investigated between two species across many taxa, reproductive isolating barriers among multiple species (>2) that would represent the most common phenomenon in the nature, remain to be clarified. Here, we use double digest restriction-site associated DNA (ddRAD) sequencing to examine patterns of hybridization at a sympatric site where three Ligularia species grow together and verify whether those patterns contribute to the maintenance of boundaries among species...
June 7, 2018: Journal of Integrative Plant Biology
Qiongli Wang, Gao-Ping Qu, Xiangxiong Kong, Yan Yan, Jigang Li, Jing Bo Jin
The small ubiquitin-related modifier (SUMO) modification plays an important role in the regulation of abscisic acid (ABA) signaling, but the function of the SUMO protease, in ABA signaling, remains largely unknown. Here, we show that the SUMO protease, ASP1 positively regulates ABA signaling. Mutations in ASP1 resulted in an ABA-insensitive phenotype, during early seedling development. Wild-type ASP1 successfully rescued, whereas an ASP1 mutant (C577S), defective in SUMO protease activity, failed to rescue, the ABA-insensitive phenotype of asp1-1...
May 22, 2018: Journal of Integrative Plant Biology
Mugui Wang, Yanfei Mao, Yuming Lu, Zhidan Wang, Xiaoping Tao, Jian-Kang Zhu
We developed simplified single transcriptional unit (SSTU) CRISPR systems for multiplex gene editing in rice using FnCpf1, LbCpf1 or Cas9, in which the nuclease and its crRNA array are co-expressed from a single Pol II promoter, without any additional processing machinery. Our SSTU systems are easy to construct and effective in mediating multiplex genome editing.
May 15, 2018: Journal of Integrative Plant Biology
Yichuan Wang, Yusi Ji, Ying Fu, Hongwei Guo
Microtubule reorientation is a long-standing observation that has been implicated in regulating the inhibitory effect of ethylene on axial elongation of plant cells. However, the signaling mechanism underlying ethylene-induced microtubule reorientation has remained elusive. Here, we reveal, by live confocal imaging and kinetic root elongation assays, that the time courses of ethylene-induced microtubule reorientation and root elongation inhibition are highly correlated, and that microtubule reorientation is required for the full responsiveness of root elongation to ethylene treatment...
May 12, 2018: Journal of Integrative Plant Biology
Jun Chen, Limin Zhang, Mengjiao Zhu, Lijie Han, Ya Lv, Yishan Liu, Pan Li, Haichun Jing, Hongwei Cai
Tillering contributes to grain yield and plant architecture and therefore is an agronomically important trait in sorghum (Sorghum bicolor). Here, we identified and functionally characterized a mutant of the Non-dormant Axillary Bud 1 (NAB1) gene from an ethyl methanesulfonate-mutagenized sorghum population. The nab1 mutants have increased tillering and reduced plant height. Map-based cloning revealed that NAB1 encodes a carotenoid-cleavage dioxygenase 7 (CCD7) orthologous to rice (Oryza sativa) HIGH-TILLERING DWARF1/DWARF17 and Arabidopsis thaliana MORE AXILLARY BRANCHING 3...
May 8, 2018: Journal of Integrative Plant Biology
Adam M Saffer
Pectins are complex cell wall polysaccharides important for many aspects of plant development. Recent studies have discovered extensive physical interactions between pectins and other cell wall components, implicating pectins in new molecular functions. Pectins are often localized in spatially restricted patterns, and some of these non-uniform pectin distributions contribute to multiple aspects of plant development, including the morphogenesis of cells and organs. Furthermore, a growing number of mutants affecting cell wall composition have begun to reveal the distinct contributions of different pectins to plant development...
May 4, 2018: Journal of Integrative Plant Biology
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