Plant Responses and Tolerance to Combined Salt and Drought Stress

Abobatta, Waleed Fouad

doi:10.1007/978-3-030-40277-8_2

Cited by 37 publications

(14 citation statements)

References 130 publications

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“…"100/1B" subjected to salinity is able to switch the main GS/GOGAT cycle to GDH assimilation under low N, possibly to limit energy-consuming metabolism. In fact, despite its high efficiency, the GS/GOGAT pathway is an energy consuming process when compared to GDH assimilation, by requiring an extra ATP molecule [45]. Through this mechanism, plants can save energy for the defense system and adaptation to salinity…”

Section: Discussionmentioning

confidence: 99%

Salt Stress Induces Differentiated Nitrogen Uptake and Antioxidant Responses in Two Contrasting Barley Landraces from MENA Region

et al. 2020

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The interaction between salinity and nitrogen metabolism has been investigated in two barley landraces, one tolerant (“100/1B”) and one susceptible to salinity (“Barley medenine”) from the Middle East and North Africa (MENA) region. Barley plants were exposed to 50 mM NaCl for 7 days; then, salinity was increased to 150 mM NaCl in the presence (10 mM) or limitation (1 mM) of ammonium as a nitrogen source. Upon salinity, “100/1B” was shown to support N assimilation by enhancing the glutamine synthetase (GS) and glutamine oxoglutarate aminotransferase (GOGAT) cycle under high N, and the stimulation of the glutamate dehydrogenase (GDH) pathway under low N treatment. In “Barley medenine”, salinity reduced the GS/GOGAT cycle, and increased GDH activity. Upon salinity, Heat Shock Proteins 70 and PEPC remained unchanged in “100/1B”, while they decreased in “Barley medenine”. The tolerance degree is a determining factor in enzymes’ occurrence and regulation: exposed to salinity, “100/1B” rapidly increased APX and PEPC activities, while this was delayed in “Barley medenine”. Salinity increased cyt-G6PDH levels in “100/1B”, while “Barley medenine” showed a decrease in G6PDH isoforms. Correlation analyses confirm GOGAT was related to G6PDH; GDH and APX with PEPC in “100/1B” under moderate salinity; severe salinity correlated GDH with G6PDH and PEPC. In “Barley medenine” under salinity, GOGAT was correlated with G6PDH, while APX showed a relation with PEPC. Therefore, specific enzymatic activities and occurrence can be used to determine stress responsiveness of different landraces. We suggest that the rapid increase in G6PDH, APX, and nitrogen assimilation enzymes activities represents an index of tolerance in “100/1B” and a stress symptom in “Barley medenine”.

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Section: Discussionmentioning

confidence: 99%

Salt Stress Induces Differentiated Nitrogen Uptake and Antioxidant Responses in Two Contrasting Barley Landraces from MENA Region

et al. 2020

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“…Soil salinity, being one of the most detrimental abiotic stresses, critically damages crop plants and causes a significant reduction in the yield of various fruit crops, salinity tolerance is very complicated. 10 Most fruit crops are sensitive to salinity stress and rarely fruit crops could tolerate higher salinity conditions, while, some crops like olive (Olea europaea) trees and date palm (Phoenix dactylifera L.) could be grown under moderate salinity conditions. 11…”

Section: Salinitymentioning

confidence: 99%

“…Abiotic stresses that include high temperature, drought, heatwaves, rising CO 2 levels, and high salinity in soil and water, were known to affect metabolic processes such as photosynthesis and protein synthesis, resulting in decreased growth rate and reduction in yield with lower fruit quality, therefore, plants use various mechanisms under environmental stress conditions such as morphological, physiological, biochemical, and molecular transitions in gene expression to avoid adverse effects of stress. 10 Impacts of the interactions between abiotic stress factors have a more adverse effect on fruit crops more than single stress. During signal transduction, the primary signal activates the production of secondary signaling molecules such as inositol phosphate and reactive oxygen species (ROS) resulting in the receptor-mediated release of Ca 2+ in the cells.…”

Section: Adaptation Strategiesmentioning

confidence: 99%

Fruit orchards under climate change conditions: adaptation strategies and management

Abobatta¹

2021

JABB

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Under global warming and climate change conditions fruit orchards facing different environmental challenges which cause negative impacts on the growth and productivity of various fruit trees particularly in arid and semi-arid areas, various abiotic stress such as rising temperature, drought, heatwaves, and soil salinity represented a major challenge for growth and productivity of fruit orchards. Fruit trees used different strategies to cope with abiotic stress and minimize their adverse effects. Plants used different physiological, anatomical, and morphological mechanisms to tolerate abiotic stress, such as ion homeostasis, synthesis of more compatible solute, polyamines production, antioxidant regulation, closing stomata, in addition tol modification of root system, abscission of the leaves partially, compactness canopy, reducing leaf size, furthermore, under abiotic stress plants produce various organic solutes to cope with Reactive Oxygen solutes like Proline, in addition, using proper management practices that include providing adequate nutrients requirement particularly Potassium and Calcium, maintain soil moisture, using proper rootstocks tolerant for drought and salinity stress as well as exogenous application of plant growth substances could sustain orchards growth and productivity

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“…Citrus responses to the abiotic stresses related to the interaction of various factors like temperature, humidity, and tree nutritional status...etc, therefore, exposure citrus tree to combinations of abiotic stresses at the same time cause more deleterious than acting of any individual factors in citriculture in terms of yield and fruit quality, also, climate change has triggered pest's infestation, disease frequency, and water requirement and increased production cost. Rising temperature simultaneously with water shortage, affect severely on photosynthesis and increasing oxidative damage, also, combinations of environmental factors affect productivity, sustain of citrus cultivation [6].…”

Section: Impact Of Climate Change On Citrus Growth and Productivitymentioning

confidence: 99%

Citriculture and Climate Change

Abobatta¹

2020

MCDA

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BackgroundCitrus is an important evergreen economic tree in different regions in the world, and there is a significant relationship between its yield and climate conditions in different growth stages. In the climate change era, there is more need to understanding the impacts of climate change on citrus growth and productivity and the influence of the potential climate changes in the next decades in major citrus production regions such as the

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Plant Responses and Tolerance to Combined Salt and Drought Stress

Cited by 37 publications

References 130 publications

Salt Stress Induces Differentiated Nitrogen Uptake and Antioxidant Responses in Two Contrasting Barley Landraces from MENA Region

Salt Stress Induces Differentiated Nitrogen Uptake and Antioxidant Responses in Two Contrasting Barley Landraces from MENA Region

Fruit orchards under climate change conditions: adaptation strategies and management

Citriculture and Climate Change

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