Chlorophyll fluorescence and oxidative stress endpoints to discriminate olive cultivars tolerance to drought and heat episodes

Dias, Maria Celeste; Correia, Sandra; Serôdio, João; Silva, Artur M. S.; Freitas, Helena; Santos, Conceição

doi:10.1016/j.scienta.2017.12.007

Cited by 67 publications

(51 citation statements)

References 20 publications

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“…In this context, chlorophyll (Chl) fluorescence parameters are efficient indicators of the transport of light energy and electrons in PSII and can therefore be used as a measure of the WL impact on leaf photochemistry (Dias et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Differential response of growth and photosynthesis in diverse cotton genotypes under hypoxia stress

Pan¹,

Jiang²,

Wang³

et al. 2019

Photosynt.

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The objectives of the present study were to compare the dynamic of the growth and photosynthetic characteristics of cotton varieties contrasting in waterlogging (WL) tolerance when subjected to hypoxia stress. The growth of the WL-sensitive genotypes was notably inhibited by WL, mainly as a result of a significant reduction in the net photosynthesis (PN) after two days of hypoxia treatment; in the tolerant varieties, no significant changes in PN were observed until 8 d after hypoxia onset. The intercellular CO2 concentration and maximal photochemical efficiency of PSII significantly declined, and the nonphotochemical quenching increased in the sensitive varieties. Infrared thermography showed that a low stomatal conductance resulted in an increased leaf temperature under hypoxia stress. Spectral image analysis suggested that the pigment content and water content rapidly decreased in the leaves of the sensitive varieties. It is concluded that maintaining stomatal opening through the interaction of ethylene and abscisic acid may be an important strategy to improve waterlogging tolerance in cotton.Additional key words: chlorophyll fluorescence; Gossypium hirsutum; hyperspectral image; infrared thermal image. Abbreviations: Ci -intercellular CO2 concentration; E -transpiration rate; Fv/Fm -optimal/maximal quantum yield of PSII; gs -stomatal conductance; NDWI -normalized difference water index; NPQ -nonphotochemical quenching coefficient; PN -net photosynthetic rate; PSSRa -pigment ratio index a; qp -photochemical quenching coefficient. Acknowledgement: We appreciate the contribution of C. Li and Y.W. Nong on experimental execution. We thank to The National Natural Science Fund (No. 31471496) for financial support.

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Section: Introductionmentioning

confidence: 99%

Differential response of growth and photosynthesis in diverse cotton genotypes under hypoxia stress

Pan¹,

Jiang²,

Wang³

et al. 2019

Photosynt.

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“…Despite the high oxidative stress related to the greater growth and respiration rates in gall tissues, some green galls can maintain photosynthetic metabolism [ 13 – 19 ], which may have an important role in the maintenance of gall tissue homeostasis [ 4 ], and avoidance of hypercarbia and hypoxia [ 14 , 20 ]. Chloroplasts are sites of major production of reactive oxygen species (ROS), and during stressful conditions, the rates of absorbed light exceed those required for photochemical reactions, which increases ROS production and oxidative damages [ 21 – 22 ]. Oxidative stress then causes alterations in chlorophyll fluorescence rates, such as reduction in maximum PSII quantum yield ( F v /F m ), and instantaneous fluorescence decline ratio in light (R fd ) [ 23 – 25 ].…”

Section: Introductionmentioning

confidence: 99%

“…Oxidative stress is related to the peroxidation of membrane phospholipids and oxidation of proteins, which may affect cell physiology and culminate in programmed cell death (PCD) [ 22 , 25 , 27 ]. Accordingly, the primary roles of polyphenols may involve dissipation of oxidative stress induced both by abiotic and biotic factors [ 28 ], while the anti-herbivore role could be secondary [ 12 , 29 ], and effective just for the attack of generalists [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

Antioxidant metabolism in galls due to the extended phenotypes of the associated organisms

et al. 2018

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Animal-induced galls are considered extended phenotypes of their inducers, and therefore plant morphogenesis and metabolism may vary according to the species of gall inducers. The alterations in vacuolar and apoplastic polyphenols, carotenoids, chlorophyll fluorescence rates, PSII quantum yield, and phospholipid peroxidation were studied in galls induced by Ditylenchus gallaeformans (Nematoda) on Miconia albicans and M. ibaguensis (Melastomataceae), and by an unidentified Eriophyidae (Acarina) on M. ibaguensis. The focus currently addressed is gall metabolism as the extended phenotype of the gall inducers, and the neglected determination of gall functionalities over host plant peculiarities. Galls induced by D. gallaeformans on M. albicans and by the Eriophyidae on M. ibaguensis have increased accumulation of apoplastic and vacuolar phenolics, which is related to the control of phospholipid peroxidation and photoprotection. The galls induced by D. gallaeformans on M. ibaguensis have higher carotenoid and vacuolar polyphenol contents, which are related to excessive sunlight energy dissipation as heat, and photoprotection. Accordingly, antioxidant strategies varied according to the gall-inducing species and to the host plant species. The distinctive investments in carotenoid and/or in polyphenol concentrations in the studied galls seemed to be peculiar mechanisms to maintain oxidative homeostasis. These mechanisms were determined both by the stimuli of the gall-inducing organism and by the intrinsic physiological features of the host plant species. Therefore, the roles of both associated organisms in host plant-galling organisms systems over gall metabolism is attested.

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“…Chlorophyll fluorescence analysis has usually proved to be a good mechanism to study photochemical damage (Dias et al, ). Results analysis showed that the Fv/Fm ratio was significantly affected by Fe deficiency treatment, especially in the sensitive genotypes TN1.11 and TN6.18.…”

Section: Discussionmentioning

confidence: 99%

“…However, the low correlation found in the tolerant plants indicates that the observed diminution of chlorophyll concentration in deficient plants is not mainly due to the decrease of iron leaf content but may be due to damage of the photosynthetic machinery. Chlorophyll fluorescence analysis has usually proved to be a good mechanism to study photochemical damage (Dias et al, 2018). Results analysis showed that the Fv/Fm ratio was significantly affected by Fe deficiency treatment, especially in the sensitive genotypes TN1.11 and TN6.18.…”

Section: Discussionmentioning

confidence: 99%

Biodiversity within Medicago truncatula genotypes toward response to iron deficiency: Investigation of main tolerance mechanisms

Kallala

M’sehli

Jelali

et al. 2019

Plant Species Biology

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Iron (Fe) deficiency is one of the major environmental stresses affecting plant production in the world. The selection of tolerant genotypes is considered an effective remediation strategy for this stress. The present study was carried out in order to investigate the biodiversity within Medicago truncatula plants in response to Fe deficiency, to identify tolerant genotypes and to assess the main tolerance mechanisms. To do this, a screening test was performed on 20 M. truncatula genotypes cultivated in minimal medium. Biometric and physiological markers were analyzed, including plant biomass, chlorophyll and root architecture. Results showed a biodiversity among the 20 genotypes. Interestingly, Fe deficiency tolerance was highest in TN8.20 and A17 genotypes. However, the lowest tolerance behavior was observed in TN1.11 and TN6.18. In order to investigate the main tolerance mechanisms, an experiment was conducted in the hydroponic system on already selected genotypes. Assessment of Fe deficiency tolerance was performed mainly on plant growth parameters, Fe (III)‐chelate‐reductase activity, rhizosphere acidification and antioxidant system defense. The relative better tolerance of A17 and TN8.20 to Fe deficiency was positively correlated with their capacity to maintain higher Fe‐acquisition efficiency in roots via rhizosphere acidification and the stimulation of Fe (III)‐chelate‐reductase activity. Moreover, tolerant genotypes showed the lowest decreases in chlorophyll content and photosynthetic activity (CO2 assimilation) compared to the sensitive ones. The efficiency of antioxidant capacity of the tolerant genotypes was revealed in stimulation of catalase (CAT) and peroxidase (POX) activities as well as accumulation of polyphenols, leading to the maintenance of cell integrity under Fe deficiency.

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Chlorophyll fluorescence and oxidative stress endpoints to discriminate olive cultivars tolerance to drought and heat episodes

Cited by 67 publications

References 20 publications

Differential response of growth and photosynthesis in diverse cotton genotypes under hypoxia stress

Differential response of growth and photosynthesis in diverse cotton genotypes under hypoxia stress

Antioxidant metabolism in galls due to the extended phenotypes of the associated organisms

Biodiversity within Medicago truncatula genotypes toward response to iron deficiency: Investigation of main tolerance mechanisms

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