PHYSIOLOGICAL RESPONSES OF ALFALFA SEEDLINGS TO FREEZE-THAW, NaCl AND Na2SO4 STRESS

Bao, Guirong; Qu, Yan; Yan, Bairu; Bian, Wenjie; Chen, W.; Li, Y.; Cui, Xiulin

doi:10.15666/aeer/1803_45574567

Cited by 5 publications

(6 citation statements)

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“…From the results, it is clear that artemisinin stress reduced the SP content of barley leaves, attributing to allelochemicals initially reduce the incorporation of certain amino acids that are raw materials of protein synthesis, consequently, the rate of protein synthesis reduced (Baziramakenga et al, 1997). Under freeze-thaw condition, the SP content of the seedlings increases signi cantly as the temperature dropping down, which is consistent with previous studies, in which researchers demonstrated that the accumulation of SP induced by the decreasing temperature might reduce the osmotic potential of cells (Airaki et al, 2012), improving the water retention capacity, and eventually, the damage of freeze-thaw stress to plants was relieved (Bao et al, 2019b). The SP content of seedling leaves in the present of salinity stress (SO*) increased more, while that of leaves in the present of artemisinin stress (OA*) increased less compared to control (OO*), indicating that the salinity stress may improve the resistance of highland barley to freeze-thaw stress to a certain extent, while artemisinin stress might make highland barley more sensitive to freeze-thaw stress, and the combined stress of salinity and artemisinin may weaken the osmotic adjustment ability of highland barley.…”

Section: Discussionsupporting

confidence: 90%

Barley Seedlings in Response to Salinity and Artemisinin Stress in the Present of Freeze-Thaw Stress

Zhang

Bao

Tang

et al. 2022

Preprint

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In the Qinghai-Tibet Plateau, both the large daily temperature difference and soil salinization make plants susceptible to abiotic stresses such as freeze-thaw and salinity. Meanwhile, crops in this area could be subjected to the influence of artemisinin, an allelochemical exuded by Artemisia annua. In the context of freeze-thaw and salinity stresses, artemisinin was induced as an allelopathy stress factor to explore the physiological response of highland barley, including the relative electrical conductivity (RC), soluble protein (SP) content, malondialdehyde (MDA) content, antioxidant enzyme activity, and water use efficiency (WUE).There data suggested that artemisinin weakened the self-osmotic adjustment ability of seedlings, reducing the SOD activity in scavenging efficiency of reactive oxygen species, then causing oxidative damage to cell membrane of seedlings, which significantly increases the content of RC and MDA. Artemisinin stress can reduce the WUE of seedlings and weaken the photosynthesis intensity of seedlings as well. In a word, salinity stress and artemisinin respectively showed a synergistic compound relationship with freeze-thaw stress,

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Section: Discussionsupporting

confidence: 90%

Barley Seedlings in Response to Salinity and Artemisinin Stress in the Present of Freeze-Thaw Stress

Zhang

Bao

Tang

et al. 2022

Preprint

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“…It was worth noting that CAT and POD activities increased, while SOD activity decreased with a decrease of temperature, which could be explained by the role played by SOD as the rst line in defensing and eliminating reactive oxygen species (ROS). A large consumption of SOD in the process of eliminating ROS and an ine cient synthesis of enzymes in the case of low temperature were con rmed in the research results of Bao et al [17].…”

Section: Discussionmentioning

confidence: 75%

“…Most of the soluble proteins in plants are enzymes involved in metabolism [17]. An increase of soluble proteins can maintain the cell's higher osmotic potential, enhance the capacity of water absorption and holding, maintaining plant growth and improving resistance to stress [18].…”

Section: Discussionmentioning

confidence: 99%

Responses of H. vulgare L. Seedlings to Basic Salt and Drought under Freeze-thaw Condition

Tang¹,

Bao²,

Yan³

et al. 2020

Preprint

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Background Qinghai-Tibet Plateau is known for characteristics of high altitude, low rainfall and varying temperature, and the crops in this area are susceptible to abiotic stresses such as drought, basic salt and freeze-thaw that caused damages in different perspectives such as the permeability of biological membrane, osmotic adjustment, and antioxidant enzyme system. Hordeum vulgare L. is an indispensable crop in plateau and plays an important role in agricultural ecosystem as well.Result In this experiment, H. vulgare L. was used as experimental material and the physiological characteristics soluble protein (SP) content, malondialdehyde (MDA) content, antioxidant enzyme activity and relative water content (RWC) of seedlings were examined under freeze-thaw condition combined with drought and alkali stress.Conclusion Research results indicated that under the combined stresses of basic salt and drought, H. vulgare L. seedlings were damaged by lipid peroxidation, weakened superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) activities, while enhanced osmotic adjustment ability in plants cell. It was suggested that, in agricultural management, the simultaneous occurrence of two stresses, basic salt and drought, should be avoided in the early stage of H. vulgare L. planting to reduce the physiological stress on plants.

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“…The MDA and soluble sugar contents were measured with the thiobarbituric acid (TBA) chromatometry method [36]. Leaf samples (0.5 g) were ground into a homogenate with 5 ml 10% trichloroacetic acid (TCA) solution.…”

Section: Biochemical Characterizationmentioning

confidence: 99%

Physiological effects of the combined stresses of freezing-thawing, acid precipitation and deicing salt on alfalfa seedlings

Bao

Tang

et al. 2020

BMC Plant Biol

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Background Frequent freeze-thaw phenomena, together with widely used deicing salt and intense acid precipitation, often occur in northeastern China, causing damage to various aspects of plants, such as the permeability of biological membranes, osmotic adjustment, and photosystems. Aiming to explore the resistance of alfalfa to freezing-thawing (F), acid precipitation (A) and deicing salt (D), this study used Medicago sativa cv. Dongmu-70 as the experimental material, and the contents of malondialdehyde (MDA), soluble protein, soluble sugars, proline and chlorophyll were evaluated. Results As the temperature decreased, the MDA content in the seedlings of the group under combined stress (A-D-F) increased and was significantly higher than that of group F (by 69.48 ~ 136.40%). Compared with those in the control (CK) group, osmotic substances such as soluble sugars and proline in the treatment groups were higher, while the soluble protein content was lower. The chlorophyll contents in the seedlings of the treatment groups were lower than those of the CK group; however, the chlorophyll content displayed a non-significant change during the free-thaw cycle. Conclusion Injury to the permeability of the biological membranes and photosystems of alfalfa results from stress. Moreover, alfalfa maintains osmotic balance by adaptively increasing the potential of osmotic substances such as soluble sugars and proline. Furthermore, the influence of stress from freezing-thawing and deicing salt is highly substantial, but the combined stresses of acid precipitation with the two factors mentioned above had little effect on the plants.

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PHYSIOLOGICAL RESPONSES OF ALFALFA SEEDLINGS TO FREEZE-THAW, NaCl AND Na2SO4 STRESS

Cited by 5 publications

References 0 publications

Barley Seedlings in Response to Salinity and Artemisinin Stress in the Present of Freeze-Thaw Stress

Barley Seedlings in Response to Salinity and Artemisinin Stress in the Present of Freeze-Thaw Stress

Responses of H. vulgare L. Seedlings to Basic Salt and Drought under Freeze-thaw Condition

Physiological effects of the combined stresses of freezing-thawing, acid precipitation and deicing salt on alfalfa seedlings

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