The Impact of Drought Stress on Soil Microbial Community, Enzyme Activities and Plants

Bogati, Kalisa; Walczak, Maciej

doi:10.3390/agronomy12010189

Cited by 105 publications

(57 citation statements)

References 174 publications

(242 reference statements)

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“…This is due to the stimulation of the ABA precursor ACC, which prevents the growth and early maturation of the roots. The rapid root growth and low number of stomata increase leaf thickness, curling, folding, and wax formation, thus preventing water loss from leaves and roots [24]. Under drought stress, the leaf area, seedling height, ground diameter, biomass, root-shoot ratio and other indexes have been used to evaluate the drought resistance of the test materials.…”

Section: Morphological Growthmentioning

confidence: 99%

Morphological and Physiological Responses of Melia azedarach Seedlings of Different Provenances to Drought Stress

et al. 2022

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Melia azedarach Linn. is a deciduous tree of the Melia genus in the Meliaceae family that is native to China. To study the mechanism of drought resistance in Melia azedarach and evaluate the drought resistance capacity of each provenance, we selected eight provenances (Shandong Kenli, Jiangsu Pizhou, Hubei Shayang, Jiangsu Xuanwu, Jiangxi Xihu, Jiangsu Jurong, Guangdong Luogang, and Henan Shihe) as the research subjects and set four levels of drought stress treatment (CK: 75% of field capacity, mild drought: 60% of field capacity, moderate drought: 45% of field capacity, and severe drought: 30% of field capacity). The results showed that the growth in the seedling height and the ground diameter, the leaf relative water content, transpiration rate (Tr), net photosynthetic rate (Pn), stomatal conductance (Gs), and the content of chlorophyll (Chl) decreased with the increasing stress levels, while the root–shoot ratio, water saturation deficit, and the contents of malondialdehyde (MDA) increased. The SOD in most provenances initially increased and then decreased, reaching a peak during moderate drought. At the late stage of treatment, the magnitude of the changes in the photosynthetic indicators was more pronounced than in the physiological indicators. Principal component analysis showed that the contribution of all four principal components under the three drought stresses was above 85%, which represented the majority of the original data. Combined with the affiliation function method and weights, the comprehensive evaluation value (D value) of the drought resistance was calculated for the eight provenances. Then, we obtained the order of drought resistance of the test materials under the three drought stresses, respectively. The combined results revealed that the drought resistance of Henan Shihe and Jiangxi Xihu was stronger, while the drought resistance of Guangdong Luogang and Hubei Shayang was weaker. Based on the above findings, we can select provenances with strong and weak drought resistance for transcriptome sequencing to screen drought-resistant genes for an in-depth study at the molecular level.

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Section: Morphological Growthmentioning

confidence: 99%

Morphological and Physiological Responses of Melia azedarach Seedlings of Different Provenances to Drought Stress

et al. 2022

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“…Photosynthesis is the main process negatively affected by DS. The decrease in the photosynthetic process under DS occurs due to stomatal and non-stomatal limitations ( Bogati and Walczak, 2022 ). The stomata limitations are considered to be the main reason for decrease in the photosynthetic rate under mild DS, whereas non-stomata limitations are the main reason for reduction in photosynthetic rate under severe DS ( Bogati and Walczak, 2022 ).…”

Section: Plant Responses To Drought Stressmentioning

confidence: 99%

“…The decrease in the photosynthetic process under DS occurs due to stomatal and non-stomatal limitations ( Bogati and Walczak, 2022 ). The stomata limitations are considered to be the main reason for decrease in the photosynthetic rate under mild DS, whereas non-stomata limitations are the main reason for reduction in photosynthetic rate under severe DS ( Bogati and Walczak, 2022 ). Stomata closing limits the carbon dioxide (CO 2 ) absorption and prevents transpiration losses owing to reduced water potential ( Yang et al, 2021 ).…”

Section: Plant Responses To Drought Stressmentioning

confidence: 99%

“…Likewise, DS reduces the synthesis of chlorophyll contents and increases the proline contents, and causes oxidative damage by inducing the production of ROS ( Hassan et al, 2017 ). Reactive oxygen species (ROS) produced by DS synthesis of chlorophyll and photosynthetic apparatus and lead to a serious reduction in photosynthesis and subsequent assimilate production ( Bogati and Walczak, 2022 ). Drought stress also disturbs electron transport and decreases the pool size of electron acceptors ( Feng and Cao, 2005 ; Azzeme et al, 2016 ), also leading to marked reduction in photosynthesis.…”

Section: Plant Responses To Drought Stressmentioning

confidence: 99%

“…However, plants accumulate different osmolytes to counter the effects of DS. Among different osmolytes, proline (Pro) is an important osmolyte that reduces the ROS by stimulating the activity of catalase (CAT), peroxidase (POD), superoxide dismutase (SOD), and other different antioxidant enzymes ( Bogati and Walczak, 2022 ). Proline has an appreciable ability to bind and hydrate enzymes thereby it stabilizes and protects the macro-molecules and maintains their structural integrity and their functioning under DS ( Yang et al, 2021 ).…”

Section: Plant Responses To Drought Stressmentioning

confidence: 99%

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The Critical Role of Arbuscular Mycorrhizal Fungi to Improve Drought Tolerance and Nitrogen Use Efficiency in Crops

Tang

Hassan

et al. 2022

Front. Plant Sci.

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Drought stress (DS) is a serious abiotic stress and a major concern across the globe as its intensity is continuously climbing. Therefore, it is direly needed to develop new management strategies to mitigate the adverse effects of DS to ensure better crop productivity and food security. The use of arbuscular mycorrhizal fungi (AMF) has emerged as an important approach in recent years to improve crop productivity under DS conditions. AMF establishes a relationship with 80% of land plants and it induces pronounced impacts on plant growth and provides protection to plants from abiotic stress. Drought stress significantly reduces plant growth and development by inducing oxidative stress, disturbing membrane integrity, plant water relations, nutrient uptake, photosynthetic activity, photosynthetic apparatus, and anti-oxidant activities. However, AMF can significantly improve the plant tolerance against DS. AMF maintains membrane integrity, improves plant water contents, nutrient and water uptake, and water use efficiency (WUE) therefore, improve the plant growth under DS. Moreover, AMF also protects the photosynthetic apparatus from drought-induced oxidative stress and improves photosynthetic efficiency, osmolytes, phenols and hormone accumulation, and reduces the accumulation of reactive oxygen species (ROS) by increasing anti-oxidant activities and gene expression which provide the tolerance to plants against DS. Therefore, it is imperative to understand the role of AMF in plants grown under DS. This review presented the different functions of AMF in different responses of plants under DS. We have provided a detailed picture of the different mechanisms mediated by AMF to induce drought tolerance in plants. Moreover, we also identified the potential research gaps that must be fulfilled for a promising future for AMF. Lastly, nitrogen (N) is an important nutrient needed for plant growth and development, however, the efficiency of applied N fertilizers is quite low. Therefore, we also present the information on how AMF improves N uptake and nitrogen use efficiency (NUE) in plants.

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CMIP6‐projected changes in drought over Xinjiang, Northwest China

Zhang,

Wang,

Zhou

2023

Intl Journal of Climatology

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Xinjiang, located in Northwest China, is a typical arid and semiarid region. In this region, frequent droughts have caused great losses in agricultural production and social economy. Therefore, changes in drought over Xinjiang have attracted considerable attention. This study projects the drought changes over Xinjiang during the 21st century, based on the Coupled Model Intercomparison Project Phase 6 (CMIP6) simulations under three Shared Socioeconomic Pathways (SSPs). The Standardized Precipitation Evapotranspiration Index (SPEI) is applied to measure drought variation. After quantitatively evaluating the performance of 25 CMIP6 models in annual and seasonal precipitation and evapotranspiration in Xinjiang during 1995–2014, we select 13 preferred models for projection. The projection results show significant decreasing trends in annual SPEI during 2021–2100 in Xinjiang, with the trends of −0.1/10a, −0.1/10a and −0.2/10a under SSP1‐2.6, SSP2‐4.5 and SSP5‐8.5, respectively. For seasons, the projected decreasing trends of SPEI in summer, autumn and spring are greater than that in winter. Relative to 1995–2014, during 2081–2100, moderate and severe droughts are projected to occupy a major increase in drought areas in Xinjiang under the three scenarios. In addition, drought tends to become more frequent and intense and last longer especially under higher scenarios. Under SSP5‐8.5, the projected regionally averaged drought frequency, intensity and duration increase by 15%, 8% and 1 month at the end of the 21st century. On the whole, the intermodel uncertainties of the projected changes in drought over Xinjiang increase with time in each emission. The findings of this study can provide information for decision makers to develop drought adaptation measures.

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The Impact of Drought Stress on Soil Microbial Community, Enzyme Activities and Plants

Cited by 105 publications

References 174 publications

Morphological and Physiological Responses of Melia azedarach Seedlings of Different Provenances to Drought Stress

Morphological and Physiological Responses of Melia azedarach Seedlings of Different Provenances to Drought Stress

The Critical Role of Arbuscular Mycorrhizal Fungi to Improve Drought Tolerance and Nitrogen Use Efficiency in Crops

CMIP6‐projected changes in drought over Xinjiang, Northwest China

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