scholarly journals Effects of exogenous salicylic acid on physiological traits and CBF gene expression in peach floral organs under freezing stress

2017 ◽  
Vol 69 (4) ◽  
pp. 585-592 ◽  
Author(s):  
Binbin Zhang ◽  
Ruijuan Ma ◽  
Lei Guo ◽  
Zhizhong Song ◽  
Mingliang Yu
Keyword(s):  
Gene Expression ◽  
Salicylic Acid ◽  
Physiological Traits ◽  
Freezing Stress ◽  
Floral Organs ◽  
Exogenous Salicylic Acid

scholarly journals The Arabidopsis mediator complex subunit 8 regulates oxidative stress responses

2021 ◽  
Author(s):  
Huaming He ◽  
Jordi Denecker ◽  
Katrien Van Der Kelen ◽  
Patrick Willems ◽  
Robin Pottie ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Gene Expression ◽  
Salicylic Acid ◽  
Jasmonic Acid ◽  
Stress Responses ◽  
Negative Regulator ◽  
Mediator Complex ◽  
Defense Gene Expression ◽  
A Genome ◽  
Oxidative Stress Responses

Abstract Signaling events triggered by hydrogen peroxide (H2O2) regulate plant growth and defense by orchestrating a genome-wide transcriptional reprogramming. However, the specific mechanisms that govern H2O2-dependent gene expression are still poorly understood. Here, we identify the Arabidopsis Mediator complex subunit MED8 as a regulator of H2O2 responses. The introduction of the med8 mutation in a constitutive oxidative stress genetic background (catalase-deficient, cat2) was associated with enhanced activation of the salicylic acid pathway and accelerated cell death. Interestingly, med8 seedlings were more tolerant to oxidative stress generated by the herbicide methyl viologen (MV) and exhibited transcriptional hyperactivation of defense signaling, in particular salicylic acid- and jasmonic acid-related pathways. The med8-triggered tolerance to MV was manipulated by the introduction of secondary mutations in salicylic acid and jasmonic acid pathways. In addition, analysis of the Mediator interactome revealed interactions with components involved in mRNA processing and microRNA biogenesis, hence expanding the role of Mediator beyond transcription. Notably, MED8 interacted with the transcriptional regulator NEGATIVE ON TATA-LESS, NOT2, to control the expression of H2O2-inducible genes and stress responses. Our work establishes MED8 as a component regulating oxidative stress responses and demonstrates that it acts as a negative regulator of H2O2-driven activation of defense gene expression.

scholarly journals The OCL3 promoter from Sorghum bicolor directs gene expression to abscission and nutrient-transfer zones at the bases of floral organs

2014 ◽  
Vol 114 (3) ◽  
pp. 489-498 ◽  
Author(s):  
Krishna K. Dwivedi ◽  
Dominique J. Roche ◽  
Tom E. Clemente ◽  
Zhengxiang Ge ◽  
John G. Carman
Keyword(s):  
Gene Expression ◽  
Sorghum Bicolor ◽  
Nutrient Transfer ◽  
Floral Organs ◽  
Transfer Zones

scholarly journals Elma Bitkisi (Malus domestica L.)’nde Foliar Uygulanan Salisilik Asitin Donmaya Karşı Etkileri

2015 ◽  
Vol 3 (5) ◽  
pp. 221 ◽  
Author(s):  
Bengü Türkyılmaz Ünal ◽  
Oğuzhan Mentiş ◽  
Ethem Akyol
Keyword(s):  
Superoxide Dismutase ◽  
Salicylic Acid ◽  
Malus Domestica ◽  
Foliar Application ◽  
Photosynthetic Pigment ◽  
Freezing Stress ◽  
Control Group ◽  
Yield And Quality ◽  
Physiological And Biochemical

In our study we aim to increase frost resistance and improve the yield and quality of apple is important in Turkey and world economy. Phenological and morphological observations, physiological and biochemical analyzes were carried out in apple (Malus domestica L.) plants. It was studied to determine the effects of foliar Salicylic acid (0, 500 ppm/plant and 1000 ppm/plant) on adaptation of this plant when exposed to freezing stress, the quality and yield. Leaf photosynthetic pigment contents, total protein amount, proline amount, superoxide dismutase and peroxidase enzymatic activities were measured. The study planned by random experimental design and statistical analysis of data with SPSS program (LSD test) were made. It was determined that fruit and shoot numbers were increased in samples exposed to 500 ppm salicylic acid and while fruit weights were increased in samples exposed to 500 ppm and 1000 ppm salicylic acid compared to the control. Also, colour of plants were darkened. Chla, chlb, total chl, proline, superoxide dismutase and peroxidase amounts were increased significantly compared to the control group. Increases occured in the carotenoid and the protein amounts are not significant statistically. In the light of obtained data, foliar application of salicylic acid were found to reduce the effects of freezing stress and to increase the yield and quality of apple plants.

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