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Journal of Integrative Plant Biology

Hong Liu, Tian Li, Yamei Wang, Jun Zheng, Huifang Li, Chenyang Hao, Xueyong Zhang
Flowering time is a critical determinant of regional adaptation for crops and has strong effects on crop yields. Here, we report that TaZIM-A1, an atypical GATA-like transcription factor, is a negative regulator of flowering in wheat. TaZIM-A1 possessed weak transcriptional repression activity, with its CCT domain functioning as the major inhibitory region. TaZIM-A1 expression exhibited a typical circadian oscillation pattern under various light regimes. Overexpression of TaZIM-A1 caused a delay in flowering time and a decrease in thousand-kernel weight (TKW) in wheat under long-day conditions...
September 18, 2018: Journal of Integrative Plant Biology
Weiwei Liu, Chaofeng Wang, Guangda Wang, Yinping Ma, Juan Tian, Yanjun Yu, Li Dong, Zhaosheng Kong
Numerous fluorescent marker lines are currently available to visualize microtubule (MT) architecture and dynamics in living plant cells, such as markers expressing p35S::GFP-MBD or p35S::GFP-TUB6. However, these MT marker lines display obvious defects that affect plant growth or produce unstable fluorescent signals. Here, a series of new marker lines were developed, including the pTUB6::VisGreen-TUB6-expressing line in which TUB6 is under the control of its endogenous regulatory elements and eGFP is replaced with VisGreen, a brighter fluorescent protein...
September 18, 2018: Journal of Integrative Plant Biology
Li-Jun Yan, Kevin S Burgess, Wei Zheng, Zhi-Bin Tao, De-Zhu Li, Lian-Ming Gao
The evolutionary consequences of hybridization ultimately depend on the magnitude of reproductive isolation between hybrids and their parents. We evaluated the relative contributions of pre- and post-zygotic barriers to reproduction for hybrid formation, hybrid persistence and potential for reproductive isolation of hybrids formed between two Rhododendron species, R. spiciferum and R. spinuliferum. Our study established that incomplete reproductive isolation promotes hybrid formation and persistence and delays hybrid speciation...
September 7, 2018: Journal of Integrative Plant Biology
Dayong Wei, Yixin Cui, Jiaqin Mei, Lunwen Qian, Kun Lu, ZhiMin Wang, Jiana Li, Qinglin Tang, Wei Qian
Glucosinolates are amino acid-derived secondary metabolites that act as chemical defense agents against pests. However, the presence of high levels of glucosinolates severely diminishes the nutritional value of seed meals made from rapeseed (Brassica napus L.). To identify the loci affecting seed glucosinolate content (SGC), we conducted genome-wide resequencing in a population of 307 diverse B. napus accessions from the three B. napus ecotype groups, namely, spring, winter, and semi-winter. These resequencing data were used for a genome-wide association study (GWAS) to identify the loci affecting SGC...
September 5, 2018: Journal of Integrative Plant Biology
Tie-Yuan Liu, Nenghui Ye, Tao Song, Yunying Cao, Bei Gao, Di Zhang, Fuyuan Zhu, Moxian Chen, Yingjiao Zhang, Weifeng Xu, Jianhua Zhang
The rhizosheath, a layer of soil particles that adheres firmly to the root surface by a combination of root hairs and mucilage, may improve tolerance to drought stress. Setaria italica (foxtail millet), a member of the Poaceae family, is an important food and fodder crop in arid regions and forms a larger rhizosheath under drought conditions. Rhizosheath formation under drought conditions has been studied, but the regulation of root hair growth and rhizosheath size in response to soil moisture remains unclear...
September 5, 2018: Journal of Integrative Plant Biology
Zhaoliang Zhang, Yi Zheng, Byung-Kook Ham, Shupei Zhang, Zhangjun Fei, William J Lucas
In response to phosphate (Pi) deficiency, it has been shown that micro-RNAs (miRNAs) and mRNAs are transported through the phloem for delivery to sink tissues. Growing evidence also indicates that long non-coding RNAs (lncRNAs) are critical regulators of Pi homeostasis in plants. However, whether lncRNAs are present in and move through the phloem, in response to Pi deficiency, remains to be established. Here, using cucumber as a model plant, we show that lncRNAs are enriched in the phloem translocation stream and respond, systemically, to an imposed Pi-stress...
September 1, 2018: Journal of Integrative Plant Biology
Qiqi Wu, Mei Wang, Jianlin Shen, Donghua Chen, Yu Zheng, Wei Zhang
The phytohormone abscisic acid (ABA) is an important mediator in the drought response, participating in, among other processes, stomatal movements. In Arabidopsis thaliana, the serine/threonine protein kinase, OST1, regulates this response, but the function of its maize homolog has yet to be established. Here, we isolated ZmOST1 and show that its encoded protein indeed acts to regulate guard cell movement. ZmOST1 was ubiquitously expressed throughout the plant, being highly expressed in guard cells, and inducible both by exogenous ABA and water stress...
August 30, 2018: Journal of Integrative Plant Biology
Li Qu, Li-Bi Lin, Hong-Wei Xue
Rice leaf inclination is an important agronomic trait, closely related to plant architecture and yield. Identification of genes controlling leaf inclination would assist in crop improvement. Although various factors, including the plant hormones auxin and brassinosteroids, have been shown to regulate lamina joint development, the role of microRNAs in regulating leaf inclination remains largely unknown. Here, we functionally characterize the role of rice miR394 and its target, LEAF INCLINCATION 4 (LC4), which encodes an F-box protein, in the regulation of leaf inclination...
August 25, 2018: Journal of Integrative Plant Biology
Yawen Lei, Shihao Su, Liang He, Xiaohe Hu, Da Luo
Legumes can control the number of symbiotic nodules that form on their roots, thus balancing nitrogen assimilation and energy consumption. Two major pathways participate in nodulation: the Nod factor (NF) signaling pathway which involves recognition of rhizobial bacteria by root cells and promotion of nodulation, and the autoregulation of nodulation (AON) pathway which involves long-distance negative feedback between roots and shoots. Although a handful of genes have a clear role in the maintenance of nodule number, additional unknown factors may also be involved in this process...
August 21, 2018: Journal of Integrative Plant Biology
Paul F South, Amanda P Cavanagh, Patricia E Lopez-Calcagno, Christine A Raines, Donald R Ort
In C3 plants, photorespiration is an energy-expensive process, including the oxygenation of ribulose-1,5-bisphosphate (RuBP) by ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco) and the ensuing multi-organellar photorespiratory pathway required to recycle the toxic byproducts and recapture a portion of the fixed carbon. Photorespiration significantly impacts crop productivity through reducing yields in C3 crops by as much as 50% under severe conditions. Thus, reducing the flux through, or improving the efficiency of photorespiration has the potential of large improvements in C3 crop productivity...
August 20, 2018: Journal of Integrative Plant Biology
Linqian Han, Zhenna Mu, Zi Luo, Qingchun Pan, Lin Li
Long non-coding RNAs (lncRNAs), whose sequences are ∼200 bp or longer and unlikely to encode proteins, may play an important role in eukaryotic gene regulation. Although the latest maize (Zea Mays L.) reference genome provides an essential genomic resource, genome-wide annotations of maize lncRNAs have not been updated (Jiao et al. 2017). Here, we report on a large transcriptomic dataset collected from 749 RNA sequencing experiments across different tissues and stages of the maize reference inbred B73 line and 60 from its wild relative teosinte...
August 16, 2018: Journal of Integrative Plant Biology
Annette Petersen, Cuiwei Wang, Christoph Crocoll, Barbara Ann Halkier
Glucosinolates (GLSs) are sulfur-rich, amino acid-derived defense compounds characteristic of the Brassicales order. In the past, GLSs were mostly known as anti-nutritional factors in fodder, biopesticides in agriculture, and flavors in condiments such as mustard. However, in recent times, GLSs have received increased attention as promoters of human health. This has spurred intensive research towards generating rich sources of health-promoting GLSs. We provide a comprehensive overview of the biotechnological approaches applied to reach this goal...
August 6, 2018: Journal of Integrative Plant Biology
Xuelan Wang, Yan Du, Diqiu Yu
Despite the recent discovery that trehalose synthesis is important for plant development and abiotic stress tolerance, the effects of trehalose on biotic stress responses remain relatively unknown. In this study, we demonstrate that TREHALOSE PHOSPHATE SYNTHASE 5 (TPS5)-dependent trehalose metabolism regulates Arabidopsis thaliana defenses against pathogens (necrotrophic Botrytis cinerea and biotrophic Pseudomonas syringae). Pathogen infection increased trehalose levels and up-regulated TPS5 expression. The application of exogenous trehalose significantly improved plant defenses against B...
July 30, 2018: Journal of Integrative Plant Biology
Xianchen Zhang, Honghong Wu, Lingmu Chen, Yeyun Li, Xiaochun Wan
Tea plants grow in acidic soil, but to date, their intrinsic mechanisms of acidic stress tolerance have not been elucidated. Here, we assessed the tea plant response to growth on NH4 + nutrient media having different pH and iron levels. When grown in standard NH4 + nutrient solution (iron insufficient, 0.35 mg L-1 Fe2+ ), tea roots exhibited significantly lower nitrogen accumulation, plasma membrane H+ -ATPase activity, and protein levels; net H+ efflux was lower at pH 4.0 and 5.0 than at pH 6.0. Addition of 30 mg L-1 Fe2+ (iron sufficient, mimicking normal soil Fe2+ concentrations) to the NH4 + nutrient solution led to more efficient iron plaque formation on roots and increased root plasma membrane H+ -ATPase levels and activities at pH 4...
July 23, 2018: Journal of Integrative Plant Biology
Ji-Sook Yun, Sung Chul Ha, Shinae Kim, Yeon-Gil Kim, Hyeran Kim, Jeong Ho Chang
RabGTPase is a member of the Ras superfamily of small GTPases, which share a GTP-binding pocket containing highly conserved motifs that promote GTP hydrolysis. In Arabidopsis, the RabA group, which corresponds to the Rab11 group in animals, functions in the recycling of endosomes that control docking and fusion during vesicle transport. However, their molecular mechanisms remain unknown. In this study, we determined the crystal structures of the GDP-bound inactive form and both GppNHp- and GTP-bound active forms of RabA1a, at resolutions of 2...
July 16, 2018: Journal of Integrative Plant Biology
Tongjun Sun, Wanwan Liang, Yuelin Zhang, Xin Li
Salicylic acid (SA) is an essential defence hormone in plants. Upon pathogen infection, induced biosynthesis of SA 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 circles, 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
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