Ecophysiological Responses of Calcicole Cyclobalanopsis glauca (Thunb.) Oerst. to Drought Stress and Calcium Supply

Xue, Lianqing; Ren, Huadong; Long, Wei; Leng, Xiuhui; Wang, Jia; Yao, Xiaohua; Sheng, Li

doi:10.3390/f9110667

Cited by 17 publications

(10 citation statements)

References 52 publications

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“…Chen et al [47] showed that exogenous calcium could reduce the oxidative stress of cucumber seedlings under drought stress and increase the antioxidant enzyme activity of cucumber seedlings, which was consistent with the results of this study. In a study on Quercus glauca Thunb, a calcicole plant, the activities of antioxidant enzymes such as SOD, GR and GPX decreased with a prolonged stress duration [48]. There was no significant increase in POD content, which may have been due to the duration of the stress.…”

Section: Discussionmentioning

confidence: 94%

Physiological Responses of Handeliodendron bodinieri (Levl.) Rehd. to Exogenous Calcium Supply under Drought Stress

Leng

Xue

Wang

et al. 2020

Forests

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The soils in karst regions, with carbonate rocks as the background material, are characterized by two main factors, drought and high calcium levels. Handeliodendron bodinieri (Levl.) Rehd is an endemic plant species in this area of China. However, few studies have been carried out on the adaptation mechanism of H. bodinieri to drought and high calcium soil. To reveal the physiological responses of H. bodinieri to exogenous calcium under drought stress, 10% PEG-6000 was used to simulate drought stress, and the effects of exogenous calcium at different concentrations on the physiology of H. bodinieri seedlings under drought stress were studied. The results showed that drought stress significantly reduced the relative water content and water potential of H. bodinieri seedlings. Malondialdehyde (MDA) content, O2− and H2O2 production rates significantly increased under drought stress. The addition of exogenous calcium significantly reduced MDA content and O2− and H2O2 production rates. Moreover, peroxidase (POD), superoxide dismutase (SOD), catalase (CAT), ascorbic acid peroxidase (APX) and glutathione peroxidase (GPX) activities increased significantly under drought stress. At the same time, the accumulation of osmotic regulators such as soluble sugar, betaine and free proline also increased significantly. The addition of exogenous calcium further increased the activity of antioxidant enzymes and the accumulation of osmotic regulatory substances. Consequently, the oxidative stress and osmotic stress induced by drought decreased. Finally, exogenous calcium enhanced the photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration rate (Tr) of H. bodinieri under drought stress and significantly improved water use efficiency (WUE). This study confirmed that the application of exogenous calcium can enhance the water condition, photosynthetic capacity, osmotic regulation and antioxidant capacity of H. bodinieri under drought stress. Of the treatments, the 10 mmol·L−1 CaCl2 treatment is more likely to improve survival of H. bodinieri under drought tolerance. This study provides an important reference for describing the adaptation mechanism and appropriate conservation of H. bodinieri under drought and high calcium conditions.

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Section: Discussionmentioning

confidence: 94%

Physiological Responses of Handeliodendron bodinieri (Levl.) Rehd. to Exogenous Calcium Supply under Drought Stress

Leng

Xue

Wang

et al. 2020

Forests

Self Cite

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“…The reduction of RWC under drought was more pronounced in GR4, which showed that the water status in this genotype was more sensitive to drought stress than other genotypes. Water deficit also initiates the degradation of chlorophyll, lead to a decrease of photosynthetic product and eventually inhibit plant growth 22 . Chlorophyll content (SPAD) was frequently used to evaluate plant drought tolerance due to its high correlation with crop yield [23][24][25] .…”

Section: Discussionmentioning

confidence: 99%

Physiological and Biochemical Responses of four cassava cultivars to drought stress

Zhu

Luo

Nawaz

et al. 2020

Sci Rep

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the antioxidant mechanism is crucial for resisting oxidative damage induced by drought stress in plants. Different antioxidant mechanisms may contribute to the tolerance of cassava to drought stress, but for a specific genotype, the response is still unknown. The objective of this study was to investigate antioxidant response and physiological changes of four cassava genotypes under water stress conditions, by keeping the soil moisture content as 80% (control), 50% (medium), 20% (severe) of field capacity for a week. Genotypes RS01 and SC124 were keeping higher relative water content (RWC) and relative chlorophyll content (SPAD value) and less affected by oxidative stress than SC205 and GR4 under drought stress. RS01 just showed slight membrane damage and oxidative stress even under severe drought conditions. A principal component analysis showed that cassava plant water status was closely related to the antioxidant mechanism. Antioxidant response in genotypes RS01 and SC124 under drought stress might attribute to the increased accumulation of ascorbate (AsA) and glutathione (GSH) content and higher superoxide dismutase (SOD) and catalase (CAT) activities, which explained by the up-regulation of Mn-SOD and CAT genes. However, Genotypes SC205 and GR4 mainly depended on the accumulation of total phenolics (TP) and increased glutathione reductase (GR) activity, which attribute to the up-regulation of the GR gene. Our findings could provide vital knowledge for refining the tactics of cultivation and molecular breeding with drought avoidance in cassava. Drought stress is commonly induced by rainfall patterns, greenhouse effect and the variations of temperature. It is an important environmental stress factor that limits plant growth, regulation, and distribution 1-3. Compared with other abiotic stresses, drought stress exerts more restrictions on crop productivity 4 , especially on the marginal lands with poor soils and limited water resources. For resource-limited small farmers in these marginal areas, cassava (Manihot esculenta Crantz) is an important staple food crop due to its inherent tolerance to stressful environments 5. Because of its starchy roots, cassava is used for starch extraction and as feed resource and feedstock production in China and other Southeast Asian countries 6. Drought is one of the main constraints that limit cassava growth and production, particularly during the first three months after planting 7. Therefore, it is urgent to understand the mechanisms underlying drought tolerance of cassava at the seedling stage. Plants have developed defense mechanisms which enable them to adapt and survive under drought condition in their life cycle 8. The drought response of plants varies from species and the severity of the drought stress. The mechanisms of cassava resistant to water deficit include stomatal closure, decreased leaf area, the proper maintenance of net photosynthetic rate for prolonged drought, and the ability to explore water from deep soil layers 9. The defense strategies against drought ...

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“…It is characterized by a large, exposed bedrock area, many rocks and a thin soil layer, high mountains, water scarcity, lack of nutrients, large spatial heterogeneity of the soil, numerous shallow karst fissures (SKFs), soil erosion, difficult water and soil conservation, and severe seasonal and geological structural droughts. Thus, it belongs to a typical fragile ecological environment [3,4] threatening the living environment and economic development of local people and restricting the sustainable development of KRD areas [5,6].…”

Section: Introductionmentioning

confidence: 99%

Biomass Allocation, Root Spatial Distribution, and the Physiological Response of Dalbergia odorifera Seedlings in Simulated Shallow Karst Fissure-Soil Conditions

Zhende

2022

Sustainability

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Karst rocky desertification (KRD) is a typical fragile ecological environment with its key and difficult management point being vegetation restoration. Therefore, it is crucial to determine the adaptation mechanisms of suitable plants for ecological restoration in KRD areas. D. odorifera is a tall leguminous, woody plant with high medicinal and wood value. This study aimed to explore the adaptation strategy of the D. odorifera root system to the shallow karst fissure-soil (SKF-S) habitats. The growth, biomass, spatial root distribution, morphological characteristics, and physiological responses of D. odorifera seedlings under different treatments were studied in pots simulating SKF-S habitats. Through the experiments conducted, the following conclusions were obtained: (I) D. odorifera enhanced its ability to acquire limited resources through an allocation adjustment strategy (adjusting the biomass allocation strategy, increasing the root shoot ratio, prioritizing organ leaves and 3-level roots), which effectively offset some of the adverse effects; (II) with an increase in the stress severity, D. odorifera improved its resource acquisition adaptive strategy by reducing the root diameter and increasing the contact area with soil; (III) the spatial development characteristics of its root system were mainly manifested in the ability to grow vertically, deeper, compared to a horizontal extension; (IV) D. odorifera did not passively endure rocky desertification stress but actively improved its metabolism through root metabolic activity and SOD enzyme activity.

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Ecophysiological Responses of Calcicole Cyclobalanopsis glauca (Thunb.) Oerst. to Drought Stress and Calcium Supply

Cited by 17 publications

References 52 publications

Physiological Responses of Handeliodendron bodinieri (Levl.) Rehd. to Exogenous Calcium Supply under Drought Stress

Physiological Responses of Handeliodendron bodinieri (Levl.) Rehd. to Exogenous Calcium Supply under Drought Stress

Physiological and Biochemical Responses of four cassava cultivars to drought stress

Biomass Allocation, Root Spatial Distribution, and the Physiological Response of Dalbergia odorifera Seedlings in Simulated Shallow Karst Fissure-Soil Conditions

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