Photosynthetic limitation and mechanisms of photoprotection under drought and recovery of Calotropis procera, an evergreen C3 from arid regions

Rivas, Rebeca; Frosi, Gabriella; Ramos, Dalila de Brito Marques; Pereira, Silvia; Benko‐Iseppon, Ana Maria; Santos, Mariana

doi:10.1016/j.plaphy.2017.07.026

Cited by 37 publications

(37 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ETR/A ratio was also indicative of the lower photosynthetic efficiency in the WD condition (Figure 3f) because sunflower plants demanded more electrons for each CO 2 molecule assimilated. This effect was also seen in plants of Calotropis procera under the same stress condition (Rivas et al, 2017). Therefore, the ETR/A results corroborate the A/C i , parameter, indicate a disturbance in the assimilation of CO 2 that was not only due to the stomatic restriction.…”

Section: Resultssupporting

confidence: 78%

“…Vertical bars indicate means ± SE. indication of damage to the Calvin-Benson cycle is the accumulation of CO 2 in the substomatal chamber (Silva et al, 2015;Rivas et al, 2017), which cannot be verified in the ratio between the internal and external concentration of CO 2 (C i /C a ) (Figure 2d). Despite the C i /C a ratio being 3.2% lower in the WD condition in the present study, a greater difference was expected compared to the WW condition.…”

Section: Resultsmentioning

confidence: 92%

“…The increase in the formation of reactive oxygen species (ROS) in plants exposed to water deficit is also noteworthy (Batista et al, 2018). ROS promote membrane lipid peroxidation and the oxidation of macromolecules, such as nucleic acids and proteins (Rivas et al, 2017;Tariq et al, 2018). Under oxidative stress, higher concentrations of malonaldehyde (MDA) are an indicative of cellular damage, and increases in the activity of antioxidant enzymes act in the plant defense against the stress (Li et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hydrogen sulfide, potassium phosphite and zinc sulfate as alleviators of drought stress in sunflower plants

et al. 2020

View full text Add to dashboard Cite

Drought is the most harmful environmental factor crop productivity. Some chemicals are used in agriculture to mitigate the damage from this stress on plants. Therefore, we examined whether the spraying of zinc sulfate (ZS), potassium phosphite (KPhi) and the hydrogen sulfide (H2S) donor sodium hydrosulfide (NaHS) would mitigate the deleterious effects of water deficit on sunflower plants by analyzing physiological and biometric characteristics. The experiment was carried out in a greenhouse using a randomized block design with five replications. The treatments were arranged in a 4 x 2 factorial scheme: [Factor A (Alleviators)] - spraying of KPhi (0.5 L ha-1), ZS (3.2 kg ha-1), NaHS (1.2 g ha-1), and water; [Factor B (substrate humidity, SH)] - 100% (well irrigated) and 30% (water deficit, WD) of field capacity. Under WD conditions, alleviators led to the maintenance of higher values of water potential (ΨW), a lower content of leaf malonaldehyde (MDA), and increased activity of the antioxidant enzyme peroxidase (POX), except for ZS. However, leaf osmotic potential, proline concentration, variables related to gas exchange and chlorophyll a fluorescence, and biometric characteristics differed only according to the SH factor. The results of ΨW and MDA for sunflower plants under WD are indicative of the mitigating capacity of ZS, KPhi, and H2S. Thus, the spraying of these compounds on sunflower plants mitigates the effects of WD, acting specifically in physiological processes related to antioxidant responses and in the maintenance of water in leaf tissues.

show abstract

Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hydrogen sulfide, potassium phosphite and zinc sulfate as alleviators of drought stress in sunflower plants

et al. 2020

View full text Add to dashboard Cite

show abstract

“…In view of the confirmation of photosynthetic activity in both cotyledon types, we expected that the quantum yield would be higher in albino plant cotyledons, which would represent a metabolic compensation for the photosynthetic inefficiency of its leaves. Photosynthetic compensation has been reported for plant leaves under various environmental conditions or stresses (Rivas et al 2017;Liu et al 2019), being one way to optimize performance of photosynthetic metabolism. However, this hypothesis was not corroborated for D. regia, and the values of F v /F m and (F 0 m -F 0 )/F 0 m were similar in cotyledons of both albino and WT seedlings.…”

Section: Discussionmentioning

confidence: 99%

Albinism in plants – far beyond the loss of chlorophyll: Structural and physiological aspects of wild‐type and albino royal poinciana (Delonix regia) seedlings

et al. 2020

View full text Add to dashboard Cite

The partial or complete loss of chlorophylls, or albinism, is a rare phenomenon in plants. In the present study, we provide the first report of the occurrence in albino Delonix regia seedlings and describe the morpho-physiological changes associated with albinism. • Wild-type (WT) and albino seedlings were characterized. Leaflets samples were processed following common procedures for analysis with light, scanning and transmission electron microscopy. The chlorophyll a fluorescence parameters and the carbohydrate, lipid and soluble protein content were also determined in leaf and cotyledon samples of both albino and WT seedlings. • Albino seedlings showed reduced growth. They also had lower chlorophyll and protein content in foliar tissues than WT seedlings, in addition to lower concentrations of lipids and carbohydrates stored in cotyledons. The chloroplasts of albino seedlings were poorly developed, with an undefined internal membrane system and the presence of plastoglobules. Wild-type seedlings had a uniseriate and hypoestomatic epidermis. The mesophyll was dorsiventral, consisting of a layer of palisade parenchyma and two to four layers of spongy parenchyma. In albino seedlings, the spongy parenchyma was compact, with few intercellular spaces, and the thickness of the mesophyll was larger, resulting in increased thickness of the leaf blade. Albino seedlings had higher stomatal density and number of pavement cells, although the stomata had smaller dimensions. • In addition to the partial loss of chlorophylls, albino D. regia showed changes at physiological and structural levels, demonstrating the crucial nature of photosynthetic pigments during the development and differentiation of plant leaf tissues/cells.

show abstract

“…For example, physiological and transcriptome analysis of R. stricta in its native desert environment revealed that R. stricta maintains growth and high photosynthetic rates at leaf temperatures as high as 43°C, light intensities >1,000 μmol m −1 s −1 and high vapor pressure deficits (VPDs; Lawson et al, 2014 ), and is one of the few desert C3 shrubs that achieve such high photosynthetic yields at leaf temperatures above 40°C (Mooney et al, 1978 ; Tezara et al, 2011 ; Rivas et al, 2017 ). Gene expression and gene sequence analysis identified two RUBISCO ACTIVASE isoforms, that are likely responsible for the maintenance of high Rubisco activities and photosynthetic rates under these extreme conditions (Lawson et al, 2014 ).…”

Section: The Need To Study Xerophytes In Their Native Environmentmentioning

confidence: 99%

Plant Life in Extreme Environments: How Do You Improve Drought Tolerance?

Bechtold

2018

Front. Plant Sci.

View full text Add to dashboard Cite

Systems studies of drought stress in resurrection plants and other xerophytes are rapidly identifying a large number of genes, proteins and metabolites that respond to severe drought stress or desiccation. This has provided insight into drought resistance mechanisms, which allow xerophytes to persist under such extreme environmental conditions. Some of the mechanisms that ensure cellular protection during severe dehydration appear to be unique to desert species, while many other stress signaling pathways are in common with well-studied model and crop species. However, despite the identification of many desiccation inducible genes, there are few “gene-to-field” examples that have led to improved drought tolerance and yield stability derived from resurrection plants, and only few examples have emerged from model species. This has led to many critical reviews on the merit of the experimental approaches and the type of plants used to study drought resistance mechanisms. This article discusses the long-standing arguments between the ecophysiology and molecular biology communities, on how to “drought-proof” future crop varieties. It concludes that a more positive and inclusive dialogue between the different disciplines is needed, to allow us to move forward in a much more constructive way.

show abstract

Photosynthetic limitation and mechanisms of photoprotection under drought and recovery of Calotropis procera, an evergreen C3 from arid regions

Cited by 37 publications

References 38 publications

Hydrogen sulfide, potassium phosphite and zinc sulfate as alleviators of drought stress in sunflower plants

Hydrogen sulfide, potassium phosphite and zinc sulfate as alleviators of drought stress in sunflower plants

Albinism in plants – far beyond the loss of chlorophyll: Structural and physiological aspects of wild‐type and albino royal poinciana (Delonix regia) seedlings

Plant Life in Extreme Environments: How Do You Improve Drought Tolerance?

Contact Info

Product

Resources

About