Cold resistance mechanisms in high desert Andean plants

Oecologia ◽  
1996 ◽  
Vol 105 (4) ◽  
pp. 552-555 ◽  
Author(s):  
Francisco A. Squeo ◽  
Ferm�n Rada ◽  
Claudio Garc�a ◽  
Mauricio Ponce ◽  
Ana Rojas ◽  
...  
Keyword(s):  
Cold Resistance ◽  
Resistance Mechanisms ◽  
Andean Plants ◽  
Cold Resistance Mechanisms ◽  
High Desert

scholarly journals Phosphoproteomics of Cold Stress-Responsive Mechanisms in Rhododendron Chrysanthum

2021 ◽  
Author(s):  
yunbo liu ◽  
Ziyao Zhang ◽  
Hang Fan ◽  
Yun Tan ◽  
Xiaofu Zhou ◽  
...  
Keyword(s):  
Cold Stress ◽  
Energy Production ◽  
Molecular Mechanisms ◽  
Cold Resistance ◽  
Resistance Mechanisms ◽  
Oxygen Species ◽  
Physiological Measurement ◽  
Plant Resource ◽  
Ros Homeostasis ◽  
Cold Resistance Mechanisms

Abstract Background: As an alpine plants，Rhododendron chrysanthum (R. chrysanthum) has evolved cold resistance mechanisms and become a valuable plant resource with the responsive mechanism of cold stress. Results: In my study, we adopt the phosphoproteomic and proteomic analysis combining with physiological measurement to illustrate the responsive mechanism of R. chrysanthum seedling under cold (4℃) stress. After chilling for 12 h, 350 significantly changed proteins and 274 significantly changed phosphoproteins were detected. COG analysis showed that significantly changed proteins and phosphoproteins were mainly involved in signal transduction and energy production and conversion under cold stress. The results indicated photosynthesis was inhibited under cold stress, but cold induced calcium-mediated signaling, reactive oxygen species (ROS) homeostasis and other transcription regulation factors could protect plants from destruction caused by cold stress. Conclusions: These data constitute a cold stress-responsive metabolic atlas in R. chrysanthum, which will springboard further investigations into the complex molecular mechanisms of plant cold adaptation.

scholarly journals Effects of Cold Stress on the Photosynthesis and Antioxidant System of Rhododendron chrysanthum Pall.

2017 ◽  
Author(s):  
Xiaofu Zhou ◽  
Silin Chen ◽  
Hui Wu ◽  
Hongwei Xu
Keyword(s):  
Cold Stress ◽  
Antioxidant System ◽  
Molecular Mechanisms ◽  
Cold Resistance ◽  
Large Subunit ◽  
Photochemical Efficiency ◽  
Resistance Mechanisms ◽  
Photochemical Quenching ◽  
Control Group ◽  
Chlorophyll Fluorescence Parameters

Rhododendron chrysanthum Pall., live in Changbai Mountain being exposed to chilling temperature, high light intensities and water scarcity condition. To adapt to the harsh environment, the cold resistance mechanisms of R. chrysanthum have been successfully evolved in the long-term adaptive process. In our present work, the methods of proteomics combined with physiological and biochemical analyses were used to investigate the effects of cold stress on the photosynthesis and antioxidant system of Rhododendron chrysanthum Pall. and the molecular mechanisms involved in cold resistance of plants. A total of 153 photosynthesis related proteins were identified in present work, of which 7 proteins including Rubisco large subunit (rbcL) were up-regulated in experiment group (EG) compared with control group (CG). Simultaneously, four chlorophyll fluorescence parameters were measured in present study. The results showed that the maximum photochemical efficiency of photosystem II (Fv/Fm), actual quantum yield of PSII (Y(II)) and photochemical quenching (qP) were significantly higher in EG, whereas the non-photochemical quenching (NPQ) was notably decreased. Cold stress could lead to a significant reduction in electron transport rate (ETR) accompanied with an increase in excitation pressure (1-qP). The abundance of PetE which involved in the plants photosynthetic electron transfer was also significantly influenced by cold stress. Moreover, the up-regulated expressions and higher levels of enzymatic activities of Glutathione peroxidase (GPX) and Ascorbate peroxidases (APXs) were detected in EG. All these changes which can help plants to survive in low temperature are considered as the crucial parts of cold tolerance mechanisms. These results revealed that photosynthesis and redox adjustment play significant roles in the defense of cold-induced damage.

scholarly journals UPLC–MS Triglyceride Profiling in Sunflower and Rapeseed Seeds

Biomolecules ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 9 ◽  
Author(s):  
Alina Chernova ◽  
Rim Gubaev ◽  
Pavel Mazin ◽  
Svetlana Goryunova ◽  
Yakov Demurin ◽  
...  
Keyword(s):  
Vegetable Oil ◽  
Global Climate ◽  
Ultra Performance Liquid Chromatography ◽  
Resistance Mechanisms ◽  
Degree Of Saturation ◽  
Winter Type ◽  
Global Climate Changes ◽  
Spring Type ◽  
Cold Resistance Mechanisms ◽  
Main Components

Sunflower and rapeseed are among the most important sources of vegetable oil for food and industry. The main components of vegetable oil are triglycerides (TAGs) (about 97%). Ultra- performance liquid chromatography coupled with mass spectrometry (UPLC–MS) profiling of TAGs in sunflower and rapeseed has been performed and the TAG profiles obtained for these species have been compared. It has been identified that 34 TAGs are shared by sunflower and rapeseed. It was demonstrated that TAGs 52:2, 52:5, 52:6, 54:3; 54:4, 54:7, 56:3, 56:4, and 56:5 had the highest variability levels between sunflower and rapeseed with the higher presence in rapeseed. TAGs 50:2, 52:3, 52:4, 54:5, and 54:6 also showed high variability, but were the most abundant in sunflower. Moreover, the differences in TAG composition between the winter-type and spring-type rapeseed have been revealed, which may be associated with freezing tolerance. It was shown that winter-type rapeseed seeds contain TAGs with a lower degree of saturation, while in spring-type rapeseed highly saturated lipids are the most abundant. These findings may give new insights into the cold resistance mechanisms in plants the understanding of which is especially important in terms of global climate changes.

scholarly journals Phosphoproteomics of Cold Stress-Responsive Mechanisms in Rhododendron Chrysanthum

2021 ◽  
Author(s):  
Yunbo Liu ◽  
Ziyao Zhang ◽  
Hang Fan ◽  
Yun Tan ◽  
Xiaofu Zhou ◽  
...  
Keyword(s):  
Cold Stress ◽  
Defense Mechanisms ◽  
Energy Production ◽  
Resistance Mechanisms ◽  
Physiological Measurement ◽  
Plant Resource ◽  
Ros Homeostasis ◽  
Clusters Of Orthologous Groups ◽  
Cold Resistance Mechanisms ◽  
Insight Into

Abstract As an alpine plant，Rhododendron chrysanthum (R. chrysanthum) has evolved cold resistance mechanisms and become a valuable plant resource with the responsive mechanism of cold stress. In my study, we adopt the phosphoproteomic and proteomic analysis combining with physiological measurement to illustrate the responsive mechanism of R. chrysanthum seedling under cold (4℃) stress. After chilling for 12 h, 350 significantly changed proteins and 274 significantly changed phosphoproteins were detected. Clusters of Orthologous Groups（COG）analysis showed that significantly changed proteins and phosphoproteins were mainly involved in signal transduction and energy production and conversion under cold stress. The results indicated photosynthesis was inhibited under cold stress, but cold induced calcium-mediated signaling, reactive oxygen species (ROS) homeostasis and other transcription regulation factors could protect plants from the destruction caused by cold stress. These results provide a detailed insight into the cold stress response and defense mechanisms of R. chrysanthum leaves at the phosphoproteome level.

Resistance mechanisms ofPrunusrootstocks to root-knot nematode,Meloidogyne incognita

Fruits ◽  
2009 ◽  
Vol 64 (5) ◽  
pp. 295-303 ◽  
Author(s):  
Hang Ye ◽  
Wen-jun Wang ◽  
Guo-jie Liu ◽  
Li-xin Zhu ◽  
Ke-gong Jia
Keyword(s):  
Meloidogyne Incognita ◽  
Resistance Mechanisms ◽  
Root Knot Nematode

Emerging Antimicrobial Resistance Among Methicillin Resistant Staphylococcus Aureus (MRSA) in a Tertiary Care Centre in North India

JMS SKIMS ◽  
2020 ◽  
Vol 23 (1) ◽  
pp. 48-49
Author(s):  
Javaid Ahmad Bhat ◽  
Shariq Rashid Masoodi
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Resistance ◽  
Tertiary Care ◽  
Resistance Mechanisms ◽  
North India ◽  
Global Public Health ◽  
Care Centre ◽  
Tertiary Care Centre ◽  
Effective Prevention ◽  
Mupirocin Resistance

Apropos to the article by Dr Bali, titled “Mupirocin resistance in clinical isolates of methicillin-sensitive and resistant Staphylococcus aureus in a tertiary care centre of North India” (1), the authors have raised important issue of emerging antimicrobial resistance (AMR). Antimicrobial resistance is an increasingly serious threat to global public health that requires action across all government sectors and society. As per WHO, AMR lurks the effective prevention and management of an ever-increasing spectrum of infections caused by bacteria, parasites, fungi and viruses. Novel resistance mechanisms are emerging and spreading globally, threatening the man’s ability to treat common infectious diseases.

Evaluation of Potent Isoquinoline-Based Thiosemicarbazone Antiproliferatives Against Solid Tumor Models

2019 ◽  
Author(s):  
Daniel Sun ◽  
Soumya Poddar ◽  
Roy D. Pan ◽  
Juno Van Valkenburgh ◽  
Ethan Rosser ◽  
...  
Keyword(s):  
Solid Tumor ◽  
Small Cell Lung Carcinoma ◽  
Single Agent ◽  
Resistance Mechanisms ◽  
Tumor Models ◽  
Cell Lung Carcinoma ◽  
Adaptive Resistance ◽  
Cancer Models ◽  
Nanomolar Range

The lead compound, an ⍺-N-heterocyclic carboxaldehyde thiosemicarbazone <b>HCT-13</b>, was highly potent against a panel of pancreatic, small cell lung carcinoma, and prostate cancer models, with IC<sub>90</sub> values in the low-to-mid nanomolar range.<b> </b>We show that the cytotoxicity of <b>HCT-13</b> is copper-dependent, that it acts as a copper ionophore, induces production of reactive oxygen species (ROS), and promotes mitochondrial dysfunction and S-phase arrest. Lastly, DNA damage response/replication stress response (DDR/RSR) pathways, specifically Ataxia-Telangiectasia Mutated (ATM) and Rad3-related protein kinase (ATR), were identified as actionable adaptive resistance mechanisms following <b>HCT-13 </b>treatment. Taken together, <b>HCT-13 </b>is potent against solid tumor models and warrants <i>in vivo</i> evaluation against aggressive tumor models, either as a single agent or as part of a combination therapy.

5-Benzylidene-4-Oxazolidinones are Synergistic with Antibiotics for the Treatment of Staphylococcus Aureus Biofilms

2019 ◽  
Author(s):  
Bram Frohock ◽  
Jessica M. Gilbertie ◽  
Jennifer C. Daiker ◽  
Lauren V. Schnabel ◽  
Joshua Pierce
Keyword(s):  
Staphylococcus Aureus ◽  
Human Health ◽  
Matrix Model ◽  
Bacterial Load ◽  
Collagen Matrix ◽  
Resistance Mechanisms ◽  
Novel Therapeutics ◽  
Innovative Treatment ◽  
Antibiotic Action ◽  
Biofilm Infection

<div>The failure of frontline antibiotics in the clinic is one of the most serious threats to human health and requires a multitude of novel therapeutics and innovative treatment approaches to curtail the growing crisis. In addition to traditional resistance mechanisms resulting in the lack of efficacy of many antibiotics, most chronic and recurring infections are further made tolerant to antibiotic action by the presence of biofilms. Herein, we report an expanded set of 5-benzylidene-4-oxazolidinones that are able to inhibit the formation of Staphylococcus aureus biofilms, disperse preformed biofilms and in combination with common antibiotics are able to significantly reduce the bacterial load in a robust collagen-matrix model of biofilm infection.</div>

MICROORGANISMS ANTIBIOTIC RESISTANCE MECHANISMS – PRESENT VIEW

2019 ◽  
Vol 21 (10) ◽  
pp. 125-130
Author(s):  
Пушилина А.Д. ◽  
◽  
Коменкова Т.С. ◽  
Зайцева Е.А. ◽  
Keyword(s):  
Antibiotic Resistance ◽  
Resistance Mechanisms ◽  
Present View
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