New perspectives on crassulacean acid metabolism biology

Cushman, John C.; Williams, David G.

doi:10.1093/jxb/erz465

Cited by 14 publications

(11 citation statements)

References 42 publications

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“…Several studies have reported strong correlations between leaf anatomical traits and CAM function (Cushman andBorland 2002, Males andGriffiths 2018), these CAM associated anatomical traits allow the plant to complete the life cycle in a short growing-season under water deficit conditions (Hancock et al 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Thus, photosynthesis plasticity contributes to the survival of both species under a combination of different stresses in their natural habitats. Since previous studies of CAM induction were conducted for most C 3 ‐ or C 4 ‐CAM facultative species in response to individual drought and salinity stress (Winter and Holtum 2014, Hultine et al 2019, Wai et al 2019), we analyzed, for the first time, the effects of a combination of drought and salt stress in the regulation of CAM induction in facultative CAM plants. However, it was reported that NaCl can induce CAM‐cycling pathway in Sedum uniflorum plants (Martin et al 2019), whether salinity can up‐regulate CAM expression in S. album , has not previously been examined.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of CAM expression, photochemistry and antioxidant responses in Sedum album and Portulaca oleracea under combined stress

Habibi

2020

Physiologia Plantarum

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Previous studies of crassulacean acid metabolism (CAM) pathway during stress have been directed at individual drought and salinity stress, here, we studied the effects of a combination of drought and salt on CAM expression, chlorophyll fluorescence and antioxidant parameters in the C 3-CAM facultative Sedum album and C 4-CAM facultative Portulaca oleracea plants. While salinity alone was not able to induce functional CAM expression in P. oleracea leaves, we showed that salinity induced low level of nocturnal acid accumulation in S. album species. After 20 d of exposure to the combination of simultaneous salt and drought stress, P. oleracea plants exhibited more resistance to photoinhibition as compared to S. album plants. The decrease of maximum quantum yield (F v /F m) in S. album leaves under combined stress was in parallel with the largest suppression of CAM expression of >50%, probably displaying the withdrawal of functional CAM back to C 3 pathway. However, under drought treatment alone, S. album plants exhibited higher photosynthetic flexibility, which was associated with the up-regulation of antioxidant enzymes activities and maintenance of glutathione (GSH) pool, and consequently higher photochemical functioning. The levels of nitric oxide (NO) correlated well with CAM expression, which was observed only in S. album, suggesting that NO acts in a different way in C 3 and C 4 species during CAM induction. Additionally, in both species, over the course of CAM induction, the changes in CAM expression parameters exhibited a similar pattern to that of antioxidant capacity and photochemical functioning parameters.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of CAM expression, photochemistry and antioxidant responses in Sedum album and Portulaca oleracea under combined stress

Habibi

2020

Physiologia Plantarum

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“…Most succulent plants have Crassulacean Acid Metabolism (CAM) that presents a timely division between CO 2 sequestration and its biochemical mechanisms for carbon fixation known in other plants. This timely division in CAM plants is characterized as opening stomata at night and sequestering CO 2 in the form of malic acid, stored in the vacuole (Hultine et al, 2019). Moreover, the accumulation of CO 2 as malic acid was perceived since ancient times as succulent plants tasted more acidic in the morning than in the afternoon.…”

Section: Carbon Fixation Pathwaysmentioning

confidence: 99%

Kalanchoë Breeding: Past, Present and Future

Kahraman¹,

Mendi

Karabıyık

et al. 2022

Ornam. Hortic.

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Kalanchoë cultivars rank as one of the most sold potted ornamental plants in the world. Among its key features that sustain high market interest are the long flowering period, abundance of flowers, thick and glossy leaves, easy maintenance and less water requirement compared to other potted plants. In breeding studies of Kalanchoë, plants with different flower colors such as white, cream, yellow, orange, red, pink and purple were developed. Moreover, double-flowered cultivars (comprising a large number of petals), more compact and cultivars with larger flowers were also obtained. Novel morphological characteristics are always in high demand in the market of ornamental plants. Increasing the variation in the gene pool with different species played a major role in the development of these characteristics. Nowadays, not only potted cultivars are launched but also cut flower cultivars have been developed and presented to consumers. Besides conventional breeding and interspecific hybridization, biotechnological methods, which have a promising future, are used to develop morphological characteristics of Kalanchoë.

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“…During the day, CO 2 is released from malate via decarboxylation and fixed by the CBB cycle. By keeping their stomata closed during the day, CAM plants avoid excessive transpiration promoted by high temperature (Hultine et al 2019 ). This efficient water-saving phenotype comes at the cost of a slow growth rate due to a large energy investment required to sustain the CO 2 concentrating mechanism.…”

Section: Introductionmentioning

confidence: 99%

Plants and water in a changing world: a physiological and ecological perspective

Caferri

Bassi

2022

Rend. Fis. Acc. Lincei

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The reduction of greenhouse gases (GHGs) emission by replacing fossil energy stocks with carbon–neutral fuels is a major topic of the political and scientific debate on environmental sustainability. Such shift in energy sources is expected to curtail the accumulation rate of atmospheric CO2, which is a strong infrared absorber and thus contributes to the global warming effect. Although such change would produce desirable outputs, the consequences of a drastic decrease in atmospheric CO2 (the substrate of photosynthesis) should be carefully considered in the light of its potential impact on ecosystems stability and agricultural productivity. Indeed, plants regulate CO2 uptake and water loss through the same anatomical structure: the leaf stomata. A reduced CO2 availability is thus expected to enhance transpiration rate in plants decreasing their water use efficiency and imposing an increased water demand for both agricultural and wild ecosystems. We suggest that this largely underestimated issue should be duly considered when implementing policies that aim at the mitigation of global environmental changes and, at the same time, promote sustainable agricultural practices, include the preservation of biodiversity. Also, we underlie the important role(s) that modern biotechnology could play to tackle these global challenges by introducing new traits aimed at creating crop varieties with enhanced CO2 capture and water- and light-use efficiency.

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New perspectives on crassulacean acid metabolism biology

Cited by 14 publications

References 42 publications

Comparison of CAM expression, photochemistry and antioxidant responses in Sedum album and Portulaca oleracea under combined stress

Comparison of CAM expression, photochemistry and antioxidant responses in Sedum album and Portulaca oleracea under combined stress

Kalanchoë Breeding: Past, Present and Future

Plants and water in a changing world: a physiological and ecological perspective

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