Summer survival of leaves in a soft-leaved shrub (<i>Phlomis fruticosa</i>L., Labiatae) under Mediterranean field conditions: avoidance of photoinhibitory damage through decreased chlorophyll contents

Kyparissis, Aris; Petropoulou, Y.; Manetas, Yiannis

doi:10.1093/jxb/46.12.1825

Cited by 210 publications

(131 citation statements)

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“…Chl levels decreased in WS rosemary, sage, and lemon balm plants, a phenomenon which has already been described for several Mediterranean plants (Kyparissis et al, 1995;Havaux et al, 1998;Munné-Bosch and Alegre, 2000). In agreement with these studies, our results suggest that Chl loss is not necessarily a symptom of unsuccessful adaptation to stress, because none of the three species showed damage to the photosynthetic apparatus at RWCs between 86% to 58%.…”

Section: Table III Carotenoid Contents Per Unit Of Chl and De-epoxidsupporting

confidence: 92%

Drought-Induced Changes in the Redox State of α-Tocopherol, Ascorbate, and the Diterpene Carnosic Acid in Chloroplasts of Labiatae Species Differing in Carnosic Acid Contents

2003

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To assess antioxidative protection by carnosic acid (CA) in combination with that of other low-molecular weight (M r ) antioxidants (␣-tocopherol [␣-T] and ascorbate [Asc]) in chloroplasts, we measured endogenous concentrations of these antioxidants, their redox states, and other indicators of oxidative stress in chloroplasts of three Labiatae species, differing in their CA contents, exposed to drought stress in the field. Damage to the photosynthetic apparatus was observed neither in CA-containing species (rosemary [Rosmarinus officinalis]) and sage [Salvia officinalis]) nor in CA-free species (lemon balm [Melissa officinalis]) at relative leaf water contents between 86% and 58%, as indicated by constant maximum efficiency of photosystem II photochemistry ratios and malondialdehyde levels in chloroplasts. The three species showed significant increases in ␣-T, a shift of the redox state of ␣-T toward its reduced state, and increased Asc levels in chloroplasts under stress. Lemon balm showed the highest increases in ␣-T and Asc in chloroplasts under stress, which might compensate for the lack of CA. Besides, whereas in rosemary and sage, the redox state of CA was shifted toward its oxidized state and the redox state of Asc was kept constant, lemon balm displayed a shift of the redox state of Asc toward its oxidized state under stress. In vitro experiments showed that both CA and Asc protect ␣-T and photosynthetic membranes against oxidative damage. These results are consistent with the contention that CA, in combination with other low-M r antioxidants, helps to prevent oxidative damage in chloroplasts of water-stressed plants, and they show functional interdependence among different low-M r antioxidants in chloroplasts.Mediterranean plants are exposed to a combination of environmental stress conditions, including low water availability, high irradiance, temperature fluctuations, and nutrient deprivation. Such stresses may lead to an imbalance between antioxidant defenses and the amount of activated oxygen species (AOS), resulting in oxidative stress (Smirnoff, 1993;Pastori and Foyer, 2002;Xiong et al., 2002). AOS are necessary for inter-and intracellular signaling (Doke, 1997;Foyer and Noctor, 1999), but at high concentrations they can cause damage at various levels of organization, including chloroplasts (Halliwell and Gutteridge, 1989;Asada, 1999). Apart from the xanthophyll cycle, photorespiration and other changes in metabolic activity, which may protect the chloroplasts from oxidative damage (Demmig-Adams and Adams, 1996;Kozaki and Takeba, 1996;Eskling et al., 1997;Osmond et al., 1997), a number of enzymatic and nonenzymatic antioxidants are present in chloroplasts that control oxygen toxicity (Smirnoff, 1993;Foyer et al., 1994;Asada, 1999). Carotenoids, ␣-tocopherol (␣-T, vitamin E), ascorbate (Asc, vitamin C), and glutathione help to maintain the integrity of the photosynthetic membranes under oxidative stress (Havaux, 1998; Noctor and Foyer, 1998;Asada, 1999;Smirnoff and Wheeler, 2000;Munné-Bosch and Ale...

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Section: Table III Carotenoid Contents Per Unit Of Chl and De-epoxidsupporting

confidence: 92%

Drought-Induced Changes in the Redox State of α-Tocopherol, Ascorbate, and the Diterpene Carnosic Acid in Chloroplasts of Labiatae Species Differing in Carnosic Acid Contents

2003

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“…which revealed the sensitivity to water stress. Decreased chlorophyll in response to drought stress has been reported in different species (Kpyoarissis et al, 1995). Likewise, Mafakheri et al (2010) also reported decreased chlorophyll contents in response to water stress at the vegetative and reproductive stage.…”

Section: Resultsmentioning

confidence: 85%

Screening of marigold (Tagetes erecta L.) cultivars for drought stress based on vegetative and physiological characteristics

Younis

Riaz

Qasim

et al. 2018

IJFAAS

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Drought tolerance is an important genotypic character to be exploited for the plant cultivar selection under water deficit conditions. In the recent study, we examined the response of two marigold cultivars (Inca and Bonanza) under different regimes of drought stress. The aim was to determine the best performing cultivar under water/drought stress. Three irrigation treatments include; 4 days (T 1 ), 6 days (T 2 ) and 8 days (T 3 ) in comparison to control 1 day (T 0 ) interval were imposed. Response characters under study were morphological, physiological and anatomical. Complete Randomized Design (CRD) with four replications in two factorial arrangements was followed for experiment layout. The results revealed that increasing water stress adversely affect plant height, in both cultivars. Both cultivars showed a decreasing trend to the number of flowers under water stress. Total chlorophyll contents including a, b were also showed reduction under prolonged drought treatment in both cultivars from (2.7 mg g -1 FW) to (1 mg g -1 FW). Overall, the performance of cultivar (cv.) Inca was satisfactory under water stress regimes. These results are helpful for selecting drought tolerant marigold cultivars in water scarce areas.

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“…With respect to the observations of NDVI, this index is sensitive to the "greenness" of the target and reaches its annual maximum between November and February ( Figure 3A), when plants have completely recovered from the summer drought and leaf chlorophyll content is high (Kyparissis et al, 1995;Baquedano and Castillo, 2006). Therefore, comparing EVI and NDVI series, it could appear that NDVI is shifted with respect to EVI.…”

Section: Sensitivity Analysismentioning

confidence: 89%

“…In fact, Mediterranean summer drought is reported to induce a generalized decrease in chlorophyll, as a mechanism of protection (Kyparissis et al, 1995). In particular, Aleppo Pine showed a 25% reduction in chlorophyll content when a 30 month water stress treatment was applied and soil water potential was maintained at -400 kPa (Baquedano and Castillo, 2006 Soil moisture in the effective root zone is the result of the balance between incoming precipitation (P) and leaf interception (I) and the losses produced by evaporation from bare soil (E), transpiration (T) and leakage (L).…”

Section: Satellite Datamentioning

confidence: 99%

Comparing two approaches for parsimonious vegetation modelling in semiarid regions using satellite data

et al. 2014

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Large portions of Earth's terrestrial surface are arid or semiarid. As in these regions the hydrological cycle and the vegetation dynamics are tightly interconnected, a coupled modelling of these two systems is needed to fully reproduce the ecosystem behaviour and to predict possible responses to climate change. In this paper, the performance of two parsimonious dynamic EVI is reported in literature to be highly correlated with leaf area index so it is compared with modelled LAI mod (r WUE-model =0.45; r LUE-model =0.57). In contrast, NDVI appears highly linked to soil moisture, through the control exerted by this variable on chlorophyll production, and is therefore used to analyze LAI* mod , models' output corrected by plant water-stress (r WUE-model =0.62; r LUE-model =0.59).MODIS LAI and ET are found to be unrealistic in the studied area. The performance of both models in this semiarid region is found to be reasonable.However, the LUE-model presents the advantages of a better performance, the possibility to be used in a wider range of climates and to have been extensively tested in literature.

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Summer survival of leaves in a soft-leaved shrub (Phlomis fruticosaL., Labiatae) under Mediterranean field conditions: avoidance of photoinhibitory damage through decreased chlorophyll contents

Cited by 210 publications

References 0 publications

Drought-Induced Changes in the Redox State of α-Tocopherol, Ascorbate, and the Diterpene Carnosic Acid in Chloroplasts of Labiatae Species Differing in Carnosic Acid Contents

Drought-Induced Changes in the Redox State of α-Tocopherol, Ascorbate, and the Diterpene Carnosic Acid in Chloroplasts of Labiatae Species Differing in Carnosic Acid Contents

Screening of marigold (Tagetes erecta L.) cultivars for drought stress based on vegetative and physiological characteristics

Comparing two approaches for parsimonious vegetation modelling in semiarid regions using satellite data

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