Effects of Drought Stress on Physiological Properties of Gazania rigens L.

Under artificial drought environment, membrane permeability, malondialdehyde (MDA) content and free proline (Pro) content of three cultivars of gazania were studied as well as the relation between the three physiological indexes and drought resistance. The results showed that: there existed significant positive correlation between relative conductivity and drought resistance in ‘Hongwen’; while ‘Xingbai’ and ‘XH’ showed the reverse result. The correlation between Pro content and drought stress treatment days in the three cultivars were significant positive. However, the correlation between MDA content and drought stress treatment days in the three cultivars were not the same. Therefore, Pro content can be chose as a physiological indicator to evaluate drought resistance in gazania.

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Penconazole and calcium ameliorate drought stress in canola by upregulating the antioxidative enzymes

Functional Plant Biology ◽

10.1071/fp19341 ◽

2020 ◽

Vol 47 (9) ◽

pp. 825 ◽

Cited By ~ 1

Author(s):

Maryam Rezayian ◽

Vahid Niknam ◽

Hassan Ebrahimzadeh

Keyword(s):

Oxidative Stress ◽

Lipid Peroxidation ◽

Drought Stress ◽

Drought Tolerance ◽

Antioxidative Enzymes ◽

Proline Content ◽

Fresh Weight ◽

Negative Effects ◽

Mda Content ◽

Effects Of Drought

The aim of this research was to gauge the alternations in the lipid peroxidation and antioxidative enzyme activity in two cultivars (cv. RGS003 and cv. Sarigol) of canola under drought stress and drought tolerance amelioration by penconazole (PEN) and calcium (Ca). Plants were treated with different polyethylene glycol (PEG) concentrations (0, 5, 10 and 15%) without or with PEN (15 mg L–1) and Ca (15 mM). The Ca treatment prevented the negative effects of drought on fresh weight (FW) in RGS003 and Sarigol at 5 and 15% PEG respectively. Ca and PEN/Ca treatments caused significant induction in the proline content in Sarigol at 15% PEG; the latter treatment was accompanied by higher glycine betaine (GB), lower malondialdehyde (MDA) and growth recovery. Hydrogen peroxide (HO2) content in Sarigol was proportional to the severity of drought stress and all PEN, Ca and PEN/Ca treatments significantly reduced the H2O2 content. PEN and PEN/Ca caused alleviation of the drought-induced oxidative stress in RGS003. RGS003 cultivar exhibited significantly higher antioxidative enzymes activity at most levels of drought, which could lead to its drought tolerance and lower MDA content. In contrast to that of Sarigol, the activity of catalase and superoxide dismutase (SOD) increased with Ca and PEN/Ca treatments in RGS003 under low stress. The application of PEN and Ca induced significantly P5CS and SOD expression in RGS003 under drought stress after 24 h. Overall, these data demonstrated that PEN and Ca have the ability to enhance the tolerance against the drought stress in canola plants.

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Silencing of The Slzf-31 Gene Decreases The Salt Stress Tolerance And Drought Tolerance Of Tomato

10.21203/rs.3.rs-172139/v1 ◽

2021 ◽

Author(s):

Tong Pei ◽

Yufang Bao ◽

Tairu Wu ◽

Ziyu Wang ◽

Yue Wang ◽

...

Keyword(s):

Salt Stress ◽

Drought Stress ◽

Virus Induced Gene Silencing ◽

Chlorophyll Fluorescence Parameters ◽

Tomato Plants ◽

Drought And Salt Stress ◽

Stem Bending ◽

Physiological Indexes ◽

Mda Content ◽

Aba Content

Abstract The SlZF-31 gene is a member of the tomato C2H2 transcription factor family. Previous studies have shown that SlZF-31 gene expression is upregulated under drought stress and salt stress, but the specific function of this gene in tomato plants in response to these two kinds of stress is still unclear. To further explore the function of the SlZF-31 gene in tomato under drought stress and salt stress, we employed the virus-induced gene silencing (VIGS) method to reduce the expression of the SlZF-31 gene in tomato. The results showed that TRV2-SlZF-31 plants had higher levels of wilt and stem bending than CK and CK-TRV2 plants under drought and salt stress. The ABA content of TRV2-SlZF-31 plants were lower than those of CK and CK-TRV2 plants. The analysis of physiological indexes showed that the SOD and POD activity and the PRO content of TRV2-SlZF-31 plants were lower than those of CK and CK-TRV2 plants, while the MDA content of TRV2-SLlZF-31 plants was higher than those of CK and CK-TRV2 plants. The accumulation of H2O2 and O2- in TRV2-SlZF-31 plants was greater than those in CK and CK-TRV2 plants. The values of the chlorophyll fluorescence parameters (ΦII and qL) of TRV2-SlZF-31 plants were significantly lower than those of CK and CK-TRV2 plants. These results showed that the silencing of the SlZF-31 gene reduces the drought resistance and salt tolerance of tomato.

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Phedimus Aizoon L. Responds to Drought Stress: Growth, Physiological Changes and Mechanism of Drought Resistance

10.21203/rs.3.rs-132688/v1 ◽

2020 ◽

Author(s):

Yuhang Liu ◽

Zhongqun He ◽

Yongdong Xie ◽

Lihong Su ◽

Ruijie Zhang ◽

...

Keyword(s):

Drought Stress ◽

Drought Resistance ◽

Soluble Sugar ◽

Severe Drought ◽

Physiological Changes ◽

Moderate Drought ◽

Negative Effect ◽

Mda Content ◽

Maximum Water ◽

Mild Drought

Abstract A pot experiment was conducted to investigate the growth, physiological changes and mechanism of drought resistance of Phedimus aizoon L. under different levels of water content .CK: 75% ~ 80% of the MWHC (maximum water holding capacity), Mild drought: 55% ~ 60%, Moderate drought: 40% ~ 45%, Severe drought: 20% ~ 25%.We observed that the plants grew normally in the first two treatments, even the mild drought promoted the growth of the roots. In the last two treatments, drought stress had a significant negative effect on plant growth, at the same time, Phedimus aizoon L. also made positive physiological response to cope with the drought: The aboveground part of the plant (leaf, plant height, stem diameter) was smaller, the waxy layer of the leaves was thickened, the stomata of the leaves were closed during the day, and only a few stomata were opened at night, which proved that the dark reaction cycle metabolism mode of the plant was transformed from C3 cycle to CAM pathway. The activity of antioxidant enzymes (SOD, POD and CAT) was continuously increased to alleviate the damage caused by drought. To ensure the relative stability of osmotic potential, the contents of osmoregulation substances such as proline, soluble sugar, soluble protein and trehalose increased correspondingly. But plants have limited regulatory power, with aggravation of drought stress degree and extension of stress time, the MDA content and electrolyte leakage of leaves increased continuously. Observed under electron microscope,the morphology of chloroplast and mitochondria changed and the membrane structure was destroyed. The plant's photosynthetic and respiratory mechanisms are destroyed and the plant gradually die.

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Study on Seed Protein and Protein Profile Pattern of Chickpea (Cice arietinum L.) by SDS-PAGE under Drought Stress and Fertilization

International Journal of Life Sciences ◽

10.3126/ijls.v9i5.12704 ◽

2015 ◽

Vol 9 (5) ◽

pp. 87-90 ◽

Cited By ~ 1

Author(s):

Vahid Ashrafi ◽

Hoorieh Pourbozorg ◽

Nasroallah Moradi Kor ◽

Abasalt Rostami Ajirloo ◽

Morteza Shamsizadeh ◽

...

Keyword(s):

Drought Stress ◽

Seed Protein ◽

Storage Proteins ◽

Seed Storage ◽

Seed Storage Proteins ◽

Protein Yield ◽

Severe Drought ◽

Stress Treatment ◽

Sds Page ◽

Effects Of Drought

A field experiment was performed in order to evaluate the effects of drought stress and application of starter nitrogen fertilizer on seed storage proteins and protein pattern in chickpea cultivars. Experiment was performed in split-factorial using randomized complete block design with three replications. The experiment was laid out in a split-factorial design with drought stress in main plots and cultivar with nitrogen fertilizer in subplots with three replications. The experimental treatments consisted of three levels of drought stress [severe drought stress (S2), moderate drought stress (S1) and no drought stress(S0)] and two cultivars of chickpea consist of Azad and Bivanij and 2 N levels. Plants were either not given any N fertilizer (N0), or fertilized by N fertilizer at the rate of 25 kg ha-1 (N25). The results of this study showed that the effects of drought stress on seed storage proteins and protein yield, effect of cultivars on protein yield were significant. With increase of drought stress seed storage proteins was increased and protein yield decreased. Severe drought stress treatment has the highest seed protein and the control treatment has the lowest seed protein. Non stress treatment has the highest protein yield and the severe drought stress treatment has the lowest protein yield. The SDS- PAGE results revealed that no effects treatments on the protein banding patterns but the related severe drought stress bands were chromatic, because they have highest protein concentration in some protein bands.DOI: http://dx.doi.org/10.3126/ijls.v9i5.12704

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Seed Germination and Physiological Characteristics of Amaranthus mangostanus L. under Drought Stress

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.183-185.1071 ◽

2011 ◽

Vol 183-185 ◽

pp. 1071-1074

Author(s):

Yong Dong Sun ◽

Xiao Hua Du ◽

Wen Jie Zhang ◽

Li Sun ◽

Ran Li

Keyword(s):

Drought Stress ◽

Seed Germination ◽

Germination Rate ◽

Proline Content ◽

Shoot Length ◽

Physiological Characteristics ◽

Sod Activity ◽

Peg 6000 ◽

Mda Content ◽

Effects Of Drought

Effects of drought stress on the seed germination and physiological characteristics of amaranth were investigated. The results were as follows: the germination rate and germination potential of amaranth decreased with the increasing of PEG-6000 concentrations. Meanwhile, the root length, shoot length and peroxidase (POD) activity were significantly increased at lower PEG-6000 concentrations, but then decreased with the increasing of PEG-6000. Malondialdehyde (MDA) content, proline content and superoxide dismutase (SOD) activity were all significantly increased under drought stress, and reached the top at 20% PEG-6000. These findings indicated that amaranth tolerates drought stress through increasing the activities of SOD and POD and accumulating proline content.

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The Effects of Drought Stress on the Photosynthetic Parameters and Dry Leaf Yield of Stevia rebaudina Bertoni

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.518-523.4786 ◽

2012 ◽

Vol 518-523 ◽

pp. 4786-4789 ◽

Cited By ~ 1

Author(s):

Guang Xi Ren ◽

Yan Shi

Keyword(s):

Drought Stress ◽

Transpiration Rate ◽

Photosynthetic Parameters ◽

Short Term ◽

Leaf Production ◽

Stress Treatment ◽

Leaf Yield ◽

Maximum Decrease ◽

Effects Of Drought ◽

Mild Drought

The effects of drought stress on the photosynthesis and dry leaf yield in the different Stevia rebaudina Bertoni germplasms of: IS-1, QF-1, QTZ4, JD-1 and AL-4 was studied with the pot method in greenhouse. The results indicated that the net photosynthetic (Pn), transpiration rate (Tr) and dry leaf production of stevia showed different degree changes with the continuing of drought-stress time. There was no significant change in Pn, Tr and dry leaf production in short-term drought-stress treatment(Ta:5d), but as the time of drought-stress continuing, the Pn were on the declining trend: the Pn of various materials in T2 (without irrigation for 10d) showed maximum decrease, they decreased for 28.85%, 47.04%, 43.03%, 43.61% and 42.25% than that in T1 (without irrigation for 5d), respectively. The variation trend of Tr in various materials were the same to the Pn. And it indicated that there was no appreciable impact on the dry leaf yield in the mild drought (without water for 5d), but with the drought stress continuing, the dry leaf yield of per plant became less and less. The varying degrees decreases of dry leaf yield in different materials with the same drought stress showed that different materials with different tolerance to drought stress.

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Adaptive reaction of cotton accessions of G. hirsutum L. and G. barbadense L. species to drought stress

Genetika ◽

10.2298/gensr1502617m ◽

2015 ◽

Vol 47 (2) ◽

pp. 617-626 ◽

Cited By ~ 1

Author(s):

Afet Mammadova ◽

Ramiz Aliyev ◽

Sevda Babayeva ◽

Mehraj Abbasov

Keyword(s):

Drought Stress ◽

Drought Resistance ◽

Sucrose Solution ◽

Population Level ◽

Physiological Adaptation ◽

Physiological Parameter ◽

Great Promise ◽

Resistant Varieties ◽

Drought Resistant ◽

Effects Of Drought

Adaptation, process of the adjustment of a plant to specific environmental conditions, is provided by physiological mechanisms (physiological adaptation), and at population level (species) by mechanisms of genetic variability, heredity and selection (genetic adaptation). Intraspecific and the interspecific physiological assessment of adaptation potential to drought stress was carried out on 267 collection accessions and varieties of a cotton (197 accessions of G. hirsutum L. and 70 of G. barbadense L.). Comparative study of the stress reaction of tested accessions to unfavorable environmental factors was carried out based on stress depression indices of viability of seeds in sucrose solution-imitating drought. As a result of the studies different sensitivity of plants to abiotic stress was determined. The amplitude of the changes of physiological parameter during stress allowed roughly divide cotton accessions within each species into groups by defining different degrees of comparative drought resistance of samples. Analysis of the percentage ratio of high drought resistant accessions within species, revealed differences between G. hirsutum L. and G. barbadense L. For the specie G. hirsutum L. percentage of accessions with high drought resistance was 9.1%, for specie G. barbadense L.-28.6%. G. barbadense L., in our view, is characterized by a greater potential for volatility and acclimatization to the new, unusual conditions, capable of better resisting the adverse effects of drought and has great promise for using in breeding. It was found that because of the stress in drought resistant varieties activation of RNA synthesis, increase of labile and decrease of stable DNA was observed which indicates an increase of the physiological liability and functional activity of the genetic apparatus. In susceptible varieties a reduction in the synthesis of RNA and DNA and displacement of DNA fraction ratio towards the stable were noted.

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