Effects of different irradiance levels on some antioxidant enzymes and on malondialdehyde content during rewatering in olive tree

Sofo, Adriano; Dichio, Bartolomeo; Xiloyannis, Cristos; Masia, Andrea

doi:10.1016/j.plantsci.2003.09.018

Cited by 205 publications

(135 citation statements)

References 61 publications

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“…When light intensity was more than 460 μmol/m 2 /s, the activities of SOD, CAT, and APX began to decrease, indicating that the light stress exceeded its tolerance. The result was similar to the related studies (Sofo et al 2003). …”

Section: Resultssupporting

confidence: 93%

Physiological response of Monimopetalum chinense to light stress under habitat fragmentation

Chen¹,

Fan²,

Wu³

et al. 2010

Plant Soil Environ.

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To determine the effect of light stress under fragmental habitat on the physiology, this paper investigated the physiological responses of Monimopetalum chinense with different light intensities in the Xianyu Mountains (Anhui, China). The study showed that both weak and intense light brought about by habitat fragmentation could improve antioxidant enzymes activities, and promote electrical conductivity and malondialdehyde content of M. chinense leaves. However, too strong light could inhibit photosynthesis rates, superoxide dismutase, catalase, and ascorbate peroxidase activities. In addition, the characteristics of leaves were affected by light intensity at the fragmental habitat. Specifically, intense light was disadvantageous to photosynthesis and antioxidant enzymes of the species. Our results suggest that the biodiversity conservation of M. chinense is necessary, and that light intensity should be considered carefully when implementing conservation efforts.

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Section: Resultssupporting

confidence: 93%

Physiological response of Monimopetalum chinense to light stress under habitat fragmentation

Chen¹,

Fan²,

Wu³

et al. 2010

Plant Soil Environ.

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“…However the observed higher antioxidant activities of SOD and PER were fond more in the FG1 clones. This results show that the FG1 clones has stronger ability of scavenging ROS to defence stress/or stronger tolerance capacity (SOFO et al, 2004). This fact is re-inforced by the lower levels of lipid peroxidation and electrolyte leakage in the FG1 than those in the FG11 clones.…”

Section: Discussionmentioning

confidence: 67%

Growth Characteristics, Physiological and Metabolic Responses of Teak (Tectona Grandis Linn. f.) Clones Differing in Rejuvenation Capacity Subjected to Drought Stress

Husen

2010

Silvae Genetica

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Summary Four-year old clones (FG1 and FG11) of teak (Tectona grandis Linn. f.), differing in rejuvenation capacity were grown in glazed earthenware pots. Drought treatments were imposed by withholding water for 20 days and rewatered to the field capacity daily for 5 days and the possible role of biochemical alteration and antioxidant metabolism in conferring photosynthetic capacity was determine by measuring photosynthetic traits, cellular damage and assaying activities of the superoxide dismutase (SOD) and peroxidase (PER) enzymes. Growth, relative water content (RWC), net photosynthetic rate (Pn), stomatal conductance (gs), chlorophyll fluorescence (Fv/Fm) and chlorophyll a, b, total chlorophyll and soluble protein content decreased significantly with increasing drought treatments from 5 to 20 days. Droughtinduced stress significantly increased the carotenoids content, relative electrolyte leakage and malondialdehyde (MDA) content, and, at the same time, accumulated free proline, free amino acid and soluble sugars in both clones. After re-watered to the field capacity daily for 5 days, both clones were shown significant recovery in the studied parameters. As compared with the FG11, the FG1 clone was more tolerant to drought as indicated by higher level of antioxidant enzyme activities as well as lower MDA content and electrolyte leakage. Similarly, drought stress caused less pronounced inhibition of Pn in FG1 than in FG11 clone. After re-hydration, the recovery was relatively quicker in FG1 than in FG11 clone. FG1 clone showed significant recovery in maximum quantum yield or photochemical efficiency of PSII (Fv/Fm) after 5 days of re-watering. The FG11 compared to the FG1, the former clone was less tolerant to drought than the latter. These results demonstrated that the different physiological strategies including antioxidative enzymes employed by the FG1 and FG11 clones of T. grandis to protect photosynthetic apparatus and alleviate drought stress. Furthermore, this study also provides ideas for teak improvement programmes and may be useful in breeding or genetic engineering for their tolerance to drought stress.

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“…MDA is often used as suitable biomarkers of membrane peroxidation damage (Baily et al, 1996). The increase of MDA content olive plants subjected to water stress also found, and was accompanied by a corresponding increase of lipoxygenase activity (Sofo et al, 2004). The intensity of water stress and the rate of MDA formation with the intensity of water deficit regulate the peroxidation process.…”

Section: Discussionmentioning

confidence: 99%

Proline, Sugars, and Antioxidant Enzymes Respond to Drought Stress in the Leaves of Strawberry Plants

Sun¹,

Li²,

Hu³

et al. 2015

HST

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Drought is a severe abiotic stress that affects global crop production. A drought model was created for 'Toyonoka' Fragaria × ananassa, and the effects of drought stress on contents of proline, sugars, and antioxidant enzyme activities were investigated. Strawberry transplants with identical growth were chosen for the experiments and the randomized design included four replications (10 plants per block). The experimental sets differed in the moisture level of the culture medium relative to the range of moisture content as follows: control, 70-85%; mild drought stress, 50-60%; moderate drought stress, 40-50%; and severe drought stress, 30-40%. Drought stress was imposed by limiting irrigation. Plants were sampled and physiological parameters were measured on 0, 2, 4, 6, 8, and 10 days after the commencement of drought stress. The water potential of strawberry leaves decreased in the plants under mild, moderate, and severe stress during the course of the water stress treatment and exhibited a significant difference from the control. Strawberry leaves subjected to drought stress had higher accumulation of proline, sugars, and malondialdehyde, and higher activities of superoxide dismutase, peroxidase, and catalase than leaves of control plants. Malondialdehyde levels increased in parallel with the severity and duration of drought stress. By contrast, antioxidant enzyme activity displayed dynamic responses to drought stress, first increasing and subsequently decreasing as the severity and duration of drought stress increased. These results suggest that strawberry plants respond to drought stress by altering the activities of antioxidant enzymes and the levels of osmotically active metabolites. These biochemical response changes may confer adaptation to drought stress and improve the capacity of plants to withstand water-deficit conditions.

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Effects of different irradiance levels on some antioxidant enzymes and on malondialdehyde content during rewatering in olive tree

Cited by 205 publications

References 61 publications

Physiological response of Monimopetalum chinense to light stress under habitat fragmentation

Physiological response of Monimopetalum chinense to light stress under habitat fragmentation

Growth Characteristics, Physiological and Metabolic Responses of Teak (Tectona Grandis Linn. f.) Clones Differing in Rejuvenation Capacity Subjected to Drought Stress

Proline, Sugars, and Antioxidant Enzymes Respond to Drought Stress in the Leaves of Strawberry Plants

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