Physiological and antioxidant responses of winter wheat cultivars to strigolactone and salicylic acid in drought

Sedaghat, Mojde; Tahmasebi‐Sarvestani, Zeinolabedin; Emam, Y.; Mokhtassi‐Bidgoli, Ali

doi:10.1016/j.plaphy.2017.08.015

Cited by 132 publications

(69 citation statements)

References 67 publications

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“…As an important environmental limitation, drought has become a rising concern due to its harm to the development and productivity of crop plants 17,18 . Cassava is a major staple food to resource-limited people in marginal areas because of its ability to survive and produce in such poor land with infrequent rainfall and low fertility 10,17,19 .…”

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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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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“…In addition, antioxidant responses have also been investigated for salt stress alone in Torreya grandis (Li et al 2014), Vicia faba (Azooz 2009), Oryza sativa (Jini and Joseph 2017) and Dianthus superbus (Ma et al 2017). Moreover, by regulating the antioxidant defense system, SA application was shown to alleviate adverse effects in drought-stressed A. thaliana (Miura et al 2013) and T. aestivum (Sedaghat et al 2017) and heat-stressed Z. mays (Horváth et al 2002), A. thaliana (Larkindale and Knight 2002), Poa pratensis (He et al 2005) and Cucumis sativa (Shi et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Time‐course analysis of salicylic acid effects on ROS regulation and antioxidant defense in roots of hulled and hulless barley under combined stress of drought, heat and salinity

Torun

2018

Physiologia Plantarum

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Greater crop losses can result from simultaneous exposure to a combination of drought, heat and salinity in the field. Salicylic acid (SA), a phenolic phytohormone, can affect a range of physiological and biochemical processes in plants and significantly impacts their resistance to these abiotic stresses. Despite numerous reports involving the positive effects of SA by applying each abiotic stress separately, the mechanism of SA-mediated adaptation to combined stresses remains elusive. This study, via a time-course analysis, investigated the role of SA on the roots of hulled and hulless (naked) barley (Hordeum vulgare L. 'Tarm' and 'Özen', respectively), which differed in salt tolerance, under the combined stress of drought, heat and salt. The combined stress caused marked reductions in root length and increases in proline content in both genotypes; however, Tarm exhibited better adaptation to the triple stress. Under the first 24 h of stress, superoxide dismutase (SOD; EC.1.15.1.1) and peroxidase (POX; EC.1.11.1.7) activity in the Tarm roots increased remarkably, while decreasing in the Özen roots. Furthermore, the Tarm roots showed higher catalase (CAT; EC 1.11.1.6), ascorbate peroxidase (APX; EC 1.11.1.11) and glutathione reductase (GR; EC 1.6.4.2) activity than the Özen during the combined stresses. The sensitivity of hulless barley roots may be related to decreasing SOD, POX, CAT and GR activity under stress. Over 72 h of stress, the SA pretreatment improved the APX and GR activity in Tarm and that of POX and CAT in Özen, demonstrating that exogenously applied SA regulates antioxidant defense enzymes in order to detoxify reactive oxygen species. The results of this study suggest that SA treatment may improve the triple-stress combination tolerance in hulled and hulless barley cultivars by increasing the level of antioxidant enzyme activity and promoting the accumulation of proline. Thus, SA alleviated the damaging effects of the triple stress by improving the antioxidant system, although these effects differed depending on characteristic of the hull of the grain.

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“…Excess active oxygen species caused by water stress can cause membrane lipid peroxidation. MDA can be an indicator of oxidative damage (Sedaghat et al, ). Many studies have shown that when plants are subjected to water stress, MDA levels increase (Jia, Sun, Li, Li, & Chen, ), and low MDA is associated with drought resistance, which can improve plant growth (Bacelar et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…CAT is another effective enzyme that can break down H 2 O 2 (Chakhchar et al, 2015;Weng et al, 2015); it degrades H 2 O 2 and prevents the subsequent degradation of fatty acids by peroxisomes (Gill & Tuteja, 2010). Malondialdehyde (MDA) is the product of membrane lipid peroxidation and is an indicator of oxidative damage (Sedaghat, Sarvestani, Emam, & Bidgoli, 2017). MDA is also one of the main compounds in drought-damaged plants (Xu, Zhou, Wang, Han, & Li, 2008).…”

Section: Introductionmentioning

confidence: 99%

Changes in levels of enzymes and osmotic adjustment compounds in key species and their relevance to vegetation succession in abandoned croplands of a semiarid sandy region

Liu

Lai

Zhou

et al. 2020

Ecology and Evolution

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Reclamation of cropland from grassland is regarded as a main reason for grassland degradation; understanding succession from abandoned cropland to grassland is thus crucial for vegetation restoration in arid and semiarid areas. Soil becomes dry when cropland is reverted to grassland, and enzyme and osmotic adjustment compounds may help plants to adapt to a drying environment. Croplands that were abandoned in various years on the Ordos Plateau in China, were selected for the analysis of the dynamics of enzymes and osmotic adjustment compounds in plant species during vegetation succession. With increasing number of years since abandonment, levels of superoxide dismutase increased in Stipa bungeana, first decreased and then increased in Lespedeza davurica and Artemisia frigida, and fluctuated in Heteropappus altaicus. Levels of peroxidase and catalase in the four species fluctuated; levels of proline, soluble sugar, and soluble protein either decreased or first increased and then generally decreased. According to a drought resistance index, the drought resistance of the four species was ranked in descending order as follows: S. bungeana > A. frigida > H. altaicus > L. davurica. The drought resistance ability of the different species was closely linked with vegetation succession from communities dominated by annual and biennial species (with main accompanying species of L. davurica and H. altaicus) to communities dominated by perennial species (S. bungeana and A. frigida) when soil became dry owing to increasing evapotranspiration after cropland abandonment. The restoration of S. bungeana steppe after cropland abandonment on the Ordos Plateau is recommended both as high‐quality forage and for environmental sustainability.

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Physiological and antioxidant responses of winter wheat cultivars to strigolactone and salicylic acid in drought

Cited by 132 publications

References 67 publications

Physiological and Biochemical Responses of four cassava cultivars to drought stress

Physiological and Biochemical Responses of four cassava cultivars to drought stress

Time‐course analysis of salicylic acid effects on ROS regulation and antioxidant defense in roots of hulled and hulless barley under combined stress of drought, heat and salinity

Changes in levels of enzymes and osmotic adjustment compounds in key species and their relevance to vegetation succession in abandoned croplands of a semiarid sandy region

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