scholarly journals Rice PIN Auxin Efflux Carriers Modulate the Nitrogen Response in a Changing Nitrogen Growth Environment

2021 ◽  
Vol 22 (6) ◽  
pp. 3243
Author(s):  
Yun-Shil Gho ◽  
Min-Yeong Song ◽  
Do-Young Bae ◽  
Heebak Choi ◽  
Ki-Hong Jung
Keyword(s):  
Expression Patterns ◽  
Ammonium Assimilation ◽  
Nitrogen Response ◽  
Growth Environment ◽  
Auxin Distribution ◽  
Highly Active ◽  
N Assimilation ◽  
N Deficiency ◽  
Almost All ◽  
Auxin Efflux Carriers

Auxins play an essential role in regulating plant growth and adaptation to abiotic stresses, such as nutrient stress. Our current understanding of auxins is based almost entirely on the results of research on the eudicot Arabidopsis thaliana, however, the role of the rice PIN-FORMED (PIN) auxin efflux carriers in the regulation of the ammonium-dependent response remains elusive. Here, we analyzed the expression patterns in various organs/tissues and the ammonium-dependent response of rice PIN-family genes (OsPIN genes) via qRT–PCR, and attempted to elucidate the relationship between nitrogen (N) utilization and auxin transporters. To investigate auxin distribution under ammonium-dependent response after N deficiency in rice roots, we used DR5::VENUS reporter lines that retained a highly active synthetic auxin response. Subsequently, we confirmed that ammonium supplementation reduced the DR5::VENUS signal compared with that observed in the N-deficient condition. These results are consistent with the decreased expression patterns of almost all OsPIN genes in the presence of the ammonium-dependent response to N deficiency. Furthermore, the ospin1b mutant showed an insensitive phenotype in the ammonium-dependent response to N deficiency and disturbances in the regulation of several N-assimilation genes. These molecular and physiological findings suggest that auxin is involved in the ammonium assimilation process of rice, which is a model crop plant.

scholarly journals Optimal Nitrogen Supply Ameliorates the Performance of Wheat Seedlings under Osmotic Stress in Genotype-Specific Manner

Plants ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 493 ◽  
Author(s):  
Tania Kartseva ◽  
Anelia Dobrikova ◽  
Konstantina Kocheva ◽  
Vladimir Alexandrov ◽  
Georgi Georgiev ◽  
...  
Keyword(s):  
Osmotic Stress ◽  
Stress Tolerance ◽  
Wheat Variety ◽  
Growth And Yield ◽  
Physiological Status ◽  
Wheat Seedlings ◽  
Modern Variety ◽  
N Supply ◽  
N Assimilation ◽  
N Deficiency

Strategies and coping mechanisms for stress tolerance under sub-optimal nutrition conditions could provide important guidelines for developing selection criteria in sustainable agriculture. Nitrogen (N) is one of the major nutrients limiting the growth and yield of crop plants, among which wheat is probably the most substantial to human diet worldwide. Physiological status and photosynthetic capacity of two contrasting wheat genotypes (old Slomer and modern semi-dwarf Enola) were evaluated at the seedling stage to assess how N supply affected osmotic stress tolerance and capacity of plants to survive drought periods. It was evident that higher N input in both varieties contributed to better performance under dehydration. The combination of lower N supply and water deprivation (osmotic stress induced by polyethylene glycol treatment) led to greater damage of the photosynthetic efficiency and a higher degree of oxidative stress than the individually applied stresses. The old wheat variety had better N assimilation efficiency, and it was also the one with better performance under N deficiency. However, when both N and water were deficient, the modern variety demonstrated better photosynthetic performance. It was concluded that different strategies for overcoming osmotic stress alone or in combination with low N could be attributed to differences in the genetic background. Better performance of the modern variety conceivably indicated that semi-dwarfing (Rht) alleles might have a beneficial effect in arid regions and N deficiency conditions.

scholarly journals Integrative Transcriptomic and Proteomic Analysis Reveals an Alternative Molecular Network of Glutamine Synthetase 2 Corresponding to Nitrogen Deficiency in Rice (Oryza sativa L.)

2021 ◽  
Vol 22 (14) ◽  
pp. 7674
Author(s):  
Ting Liang ◽  
Zhengqing Yuan ◽  
Lu Fu ◽  
Menghan Zhu ◽  
Xiaoyun Luo ◽  
...  
Keyword(s):  
Glutamine Synthetase ◽  
Oryza Sativa L ◽  
Alternative Pathway ◽  
Rice Variety ◽  
Nitrogen Deficiency ◽  
Primary Root ◽  
Phenotypic Characterization ◽  
Glutathione Metabolism ◽  
N Assimilation ◽  
N Deficiency

Nitrogen (N) is an essential nutrient for plant growth and development. The root system architecture is a highly regulated morphological system, which is sensitive to the availability of nutrients, such as N. Phenotypic characterization of roots from LY9348 (a rice variety with high nitrogen use efficiency (NUE)) treated with 0.725 mM NH4NO3 (1/4N) was remarkable, especially primary root (PR) elongation, which was the highest. A comprehensive analysis was performed for transcriptome and proteome profiling of LY9348 roots between 1/4N and 2.9 mM NH4NO3 (1N) treatments. The results indicated 3908 differential expression genes (DEGs; 2569 upregulated and 1339 downregulated) and 411 differential abundance proteins (DAPs; 192 upregulated and 219 downregulated). Among all DAPs in the proteome, glutamine synthetase (GS2), a chloroplastic ammonium assimilation protein, was the most upregulated protein identified. The unexpected concentration of GS2 from the shoot to the root in the 1/4N treatment indicated that the presence of an alternative pathway of N assimilation regulated by GS2 in LY9348 corresponded to the low N signal, which was supported by GS enzyme activity and glutamine/glutamate (Gln/Glu) contents analysis. In addition, N transporters (NRT2.1, NRT2.2, NRT2.3, NRT2.4, NAR2.1, AMT1.3, AMT1.2, and putative AMT3.3) and N assimilators (NR2, GS1;1, GS1;2, GS1;3, NADH-GOGAT2, and AS2) were significantly induced during the long-term N-deficiency response at the transcription level (14 days). Moreover, the Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis demonstrated that phenylpropanoid biosynthesis and glutathione metabolism were significantly modulated by N deficiency. Notably, many transcription factors and plant hormones were found to participate in root morphological adaptation. In conclusion, our study provides valuable information to further understand the response of rice roots to N-deficiency stress.

The Expression of Sel1L and Tan-1 in Normal and Neoplastic Cells

2000 ◽  
Vol 15 (1) ◽  
pp. 26-32 ◽  
Author(s):  
M. Cattaneo ◽  
R. Orlandi ◽  
C. Ronchini ◽  
P. Granelli ◽  
G. Malferrari ◽  
...  
Keyword(s):  
Cell Function ◽  
Sequence Similarity ◽  
Expression Patterns ◽  
Negative Regulator ◽  
Chromosomal Mapping ◽  
Normal Adult ◽  
Neoplastic Cells ◽  
C Elegans ◽  
Pancreatic Cancers ◽  
Almost All

We have previously reported on the isolation and chromosomal mapping of a novel human gene (SEL1L), which shows sequence similarity to sel-1, an extragenic suppressor of C. elegans. sel-1 functions as a negative regulator of lin-12 activity, the latter being implicated in the control of diverse cellular differentiation events. In the present study we compare the expression patterns of SEL1L and TAN-1, the human ortholog of lin-12 in normal and neoplastic cells. We found that, whereas both genes are expressed in fetal tissues at similar levels, they are differentially expressed in normal adult and neoplastic cells. In normal adult cells SEL1L is generally present at very low levels; only in the cells of the pancreas does it show maximum expression. By contrast, SEL1L is generally well represented in most neoplastic cells but not in those of pancreatic and gastric carcinomas, where transcription is either downregulated or completely repressed. TAN-1 on the other hand is well represented in almost all normal and neoplastic cells, with very few exceptions. Our observations suggest that SEL1L is presumably implicated in pancreatic and gastric carcinogenesis and that, along with TAN-1, it is very important for normal cell function. Alterations in the expression of SEL1L may be used as a prognostic marker for gastric and pancreatic cancers.

Mechanism of anteroposterior axis specification in vertebrates. Lessons from the amphibians

Development ◽  
1992 ◽  
Vol 114 (2) ◽  
pp. 285-302 ◽  
Author(s):  
J.M. Slack ◽  
D. Tannahill
Keyword(s):  
Molecular Markers ◽  
Expression Patterns ◽  
Signal Transduction Pathway ◽  
Homeobox Gene ◽  
Neural Induction ◽  
High Sensitivity ◽  
Neural Plate ◽  
Mesoderm Induction ◽  
Inducing Factors ◽  
Almost All

Interest in the problem of anteroposterior specification has quickened because of our near understanding of the mechanism in Drosophila and because of the homology of Antennapedia-like homeobox gene expression patterns in Drosophila and vertebrates. But vertebrates differ from Drosophila because of morphogenetic movements and interactions between tissue layers, both intimately associated with anteroposterior specification. The purpose of this article is to review classical findings and to enquire how far these have been confirmed, refuted or extended by modern work. The “pre-molecular” work suggests that there are several steps to the process: (i) Formation of anteroposterior pattern in mesoderm during gastrulation with posterior dominance. (ii) Regional specific induction of ectoderm to form neural plate. (iii) Reciprocal interactions from neural plate to mesoderm. (iv) Interactions within neural plate with posterior dominance. Unfortunately, almost all the observable markers are in the CNS rather than in the mesoderm where the initial specification is thought to occur. This has meant that the specification of the mesoderm has been assayed indirectly by transplantation methods such as the Einsteckung. New molecular markers now supplement morphological ones but they are still mainly in the CNS and not the mesoderm. A particular interest attaches to the genes of the Antp-like HOX clusters since these may not only be markers but actual coding factors for anteroposterior levels. We have a new understanding of mesoderm induction based on the discovery of activins and fibroblast growth factors (FGFs) as candidate inducing factors. These factors have later consequences for anteroposterior pattern with activin tending to induce anterior, and FGF posterior structures. Recent work on neural induction has implicated cAMP and protein kinase C (PKC) as elements of the signal transduction pathway and has provided new evidence for the importance of tangential neural induction. The regional specificity of neural induction has been reinvestigated using molecular markers and provides conclusions rather similar to the classical work. Defects in the axial pattern may be produced by retinoic acid but it remains unclear whether its effects are truly coordinate ones or are concentrated in certain regions of high sensitivity. In general the molecular studies have supported and reinforced the “pre-molecular ones”. Important questions still remain: (i) How much pattern is there in the mesoderm (how many states?) (ii) How is this pattern generated by the invaginating organizer? (iii) Is there one-to-one transmission of codings to the neural plate? (iv) What is the nature of the interactions within the neural plate? (v) Are the HOX cluster genes really the anteroposterior codings?

Distance Education in the COVID-19 Pandemic

2022 ◽  
pp. 17-33
Author(s):  
Ahmet Çetinkaya ◽  
Ali Murat Kırık
Keyword(s):  
Distance Education ◽  
Online Education ◽  
Education System ◽  
Traditional Education ◽  
Physical Contact ◽  
Interpersonal Contact ◽  
Global Epidemic ◽  
Highly Active ◽  
Almost All ◽  
New Education

As the COVID-19 disease rapidly transmitted through interpersonal contact, it required people to avoid physical contact. Almost all countries in the world have suspended the education of children and youth, a highly active network, and switched to online education to reduce the spread of the virus. Distance education, unlike the traditional education system, has a structure that does not require students to be on a campus or be in the same environment with instructors. As the global epidemic broke out, the distance education system was reviewed, and a new education order started to be established. Students, parents, and teachers found themselves in a situation they were not used to before. In this study, the advantages and disadvantages of distance education are analyzed, hybrid and hybrid-flexible (hyflex) models are examined, the educational changes during the pandemic period as well as the anticipations of the post-pandemic period are reviewed, and lastly, future educational solutions are proposed.

scholarly journals Do plants use root-derived proteases to promote the uptake of soil organic nitrogen?

2020 ◽  
Vol 456 (1-2) ◽  
pp. 355-367
Author(s):  
Lucy M. Greenfield ◽  
Paul W. Hill ◽  
Eric Paterson ◽  
Elizabeth M. Baggs ◽  
Davey L. Jones
Keyword(s):  
Protease Activity ◽  
Organic Nitrogen ◽  
N Uptake ◽  
Root Surface ◽  
Organic N ◽  
Soil Organic Nitrogen ◽  
Poor Access ◽  
N Deficiency ◽  
Almost All ◽  
Soil Protein

Abstract Aims The capacity of plant roots to directly acquire organic nitrogen (N) in the form of oligopeptides and amino acids from soil is well established. However, plants have poor access to protein, the central reservoir of soil organic N. Our question is: do plants actively secrete proteases to enhance the breakdown of soil protein or are they functionally reliant on soil microorganisms to undertake this role? Methods Growing maize and wheat under sterile hydroponic conditions with and without inorganic N, we measured protease activity on the root surface (root-bound proteases) or exogenously in the solution (free proteases). We compared root protease activities to the rhizosphere microbial community to estimate the ecological significance of root-derived proteases. Results We found little evidence for the secretion of free proteases, with almost all protease activity associated with the root surface. Root protease activity was not stimulated under N deficiency. Our findings suggest that cereal roots contribute one-fifth of rhizosphere protease activity. Conclusions Our results indicate that plant N uptake is only functionally significant when soil protein is in direct contact with root surfaces. The lack of protease upregulation under N deficiency suggests that root protease activity is unrelated to enhanced soil N capture.

scholarly journals Diurnal Characteristics of Trapped Mountain Waves over the Foothills of Western Nepal Himalaya

2015 ◽  
Vol 20 (1) ◽  
pp. 102-106
Author(s):  
Ram P. Regmi
Keyword(s):  
Significant Risk ◽  
Weather Research And Forecasting ◽  
Mountain Waves ◽  
Nepal Himalaya ◽  
Low Level ◽  
Highly Active ◽  
Surrounding Areas ◽  
Almost All ◽  
Wrf Modeling ◽  
The Waves

Late wintertime diurnal variation and spatial distribution of mountain wave excitations over the Mt. Devchuli range and its surrounding areas have been numerically simulated with the application of Weather Research and Forecasting (WRF) Modeling System. The study reveals that the region holds low-level trapped mountain waves almost all the time. The waves are confined below the stratified layer at about 3km above the mean sea level. Wave excitation over the region is highly active during the afternoon time whereas it remains at minimum level during the late morning time. These waves pose significant risk for low-level aviation and parachuting activities.Journal of Institute of Science and Technology, 2015, 20(1): 102-106

scholarly journals The PIN-FORMED Auxin Efflux Carriers in Plants

2018 ◽  
Vol 19 (9) ◽  
pp. 2759 ◽  
Author(s):  
Jing-Jing Zhou ◽  
Jie Luo
Keyword(s):  
Subcellular Location ◽  
Structure Evolution ◽  
Dependent Manner ◽  
Subcellular Trafficking ◽  
Developmental Processes ◽  
Auxin Distribution ◽  
Development Processes ◽  
Auxin Efflux Carriers ◽  
Hydrophilic Loop ◽  
Polar Distribution

Auxin plays crucial roles in multiple developmental processes, such as embryogenesis, organogenesis, cell determination and division, as well as tropic responses. These processes are finely coordinated by the auxin, which requires the polar distribution of auxin within tissues and cells. The intercellular directionality of auxin flow is closely related to the asymmetric subcellular location of PIN-FORMED (PIN) auxin efflux transporters. All PIN proteins have a conserved structure with a central hydrophilic loop domain, which harbors several phosphosites targeted by a set of protein kinases. The activities of PIN proteins are finely regulated by diverse endogenous and exogenous stimuli at multiple layers—including transcriptional and epigenetic levels, post-transcriptional modifications, subcellular trafficking, as well as PINs’ recycling and turnover—to facilitate the developmental processes in an auxin gradient-dependent manner. Here, the recent advances in the structure, evolution, regulation and functions of PIN proteins in plants will be discussed. The information provided by this review will shed new light on the asymmetric auxin-distribution-dependent development processes mediated by PIN transporters in plants.

scholarly journals Identification and Expression Analysis of the PIN and AUX/LAX Gene Families in Ramie (Boehmeria nivea L. Gaud)

Agronomy ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 435 ◽  
Author(s):  
Yaning Bao ◽  
Xing Huang ◽  
Muzammal Rehman ◽  
Yunhe Wang ◽  
Bo Wang ◽  
...  
Keyword(s):  
Drought Stress ◽  
Auxin Transport ◽  
Expression Patterns ◽  
Gene Families ◽  
Ramie Fiber ◽  
Biological Functions ◽  
Qrt Pcr ◽  
Boehmeria Nivea ◽  
Auxin Distribution ◽  
Indole 3 Acetic Acid

Auxin regulates diverse aspects of growth and development. Furthermore, polar auxin transport, which is mediated by the PIN-FORMED (PIN) and AUXIN1/LIKE-AUX (AUX/LAX) proteins, plays a crucial role in auxin distribution. In this study, six PIN and four AUX/LAX genes were identified in ramie (Boehmeria nivea L.). We used qRT-PCR to characterize and analyze the two gene families, including phylogenetic relationships, intron/exon structures, cis-elements, subcellular localization, and the expression patterns in different tissues. The expression of these genes in response to indole-3-acetic acid (IAA) treatment and drought stress was also assessed; the results indicate that most of the BnAUX/LAX and BnPIN genes were regulated as a result of IAA treatment and drought stress. Our study provides insights into ramie auxin transporters and lays the foundation for further analysis of their biological functions in ramie fiber development and adaptation to environmental stresses.

Quality of life (QoL) improvements in 1,464 patients (pts) with metastatic breast cancer (MBC) receiving capecitabine (X) in Brazil: Updated results from a large pt cohort, including analysis as a function of pts’ ECOG PS

2006 ◽  
Vol 24 (18_suppl) ◽  
pp. 8599-8599 ◽  
Author(s):  
C. Oliveira ◽  
R. Ribeiro ◽  
J. G. Segalla ◽  
S. Tessaro ◽  
S. Cabral ◽  
...  
Keyword(s):  
Repeated Measures ◽  
Linear Models ◽  
Single Agent ◽  
Metastatic Breast ◽  
Future Perspective ◽  
Highly Active ◽  
C 30 ◽  
Eortc Qlq ◽  
Almost All ◽  
Ecog Ps

8599 Background: The oral fluoropyrimidine capecitabine is highly active and well tolerated as single-agent therapy and extends survival when added to docetaxel in pretreated MBC. QoL data would enhance understanding of X’s pt benefits. Methods: QoL was evaluated in women with anthracycline ± taxane-pretreated MBC while receiving X (baseline, before cycle 1, at weeks 7 and 13, and at treatment end) using EORTC QLQ C-30 (v3.0) and BR-23 questionnaires. We used linear models with repeated measures (generalized estimating questions technique) and SAS (v8.2) to determine improvement, stabilization or worsening of QoL scores from week 7 onwards. Each questionnaire item was analyzed as a function of pts’ ECOG status before first cycle and the evaluation periods. Results: Baseline characteristics of the 1,464 evaluable pts were: median age 54 years (range 22–92); 42% had ECOG 0. As expected, pts with worse initial PS (ECOG ≥2) had lower mean scores during treatment. Regardless of baseline ECOG score, X therapy was associated with significant (p<0.0001 unless stated) improvements in pts’ perception of: role functioning (p=0.001), pain, nausea/vomiting, fatigue, constipation, emotional functioning, and global health status. Capecitabine was also associated with significant improvements in pts’ perception of systemic therapy side effects (p<0.0001), breast symptoms (p<0.0001), arm symptoms (p=0.0047), hair loss (p<0.0001), and future perspective (p<0.0001). Conclusions: Pts receiving X had substantial improvements in almost all functional and symptomatic QoL domains. These findings highlight the importance of considering QoL and other measurable benefits of oral treatments alongside well-established measures of clinical evaluation in pts with metastatic disease. The QoL benefits, together with other proven clinical outcomes, suggest that early use of X in MBC would be of benefit to pts. No significant financial relationships to disclose.

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