Photosynthetic and Transpiration Rates of Three &lt;I&gt;Sedum&lt;/I&gt; Species Used for Green Roofs

Kuronuma, Takanori; Watanabe, Hitoshi

doi:10.2525/ecb.55.137

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…Sedum sediforme, which is native to mountainous regions of southwestern Europe, has been considered as drought tolerant, even if it prefers rather moist stands (Damas et al 2010;Van Mechelen et al 2014). Notwithstanding succulence, which is the only common trait of all studied genotypes, our results showed the different sensitivity of sedums to prolonged water deficit, as it has been already reported by Nagase and Dunnet (2010) and Kuronuma and Watanabe (2017).…”

Section: Discussionsupporting

confidence: 78%

Responses of succulents to drought: Comparative analysis of four Sedum (Crassulaceae) species

Koźmińska

Hassan

Wiszniewska

et al. 2019

Scientia Horticulturae

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The increased frequency and intensity of drought periods is becoming a serious thread for agriculture, prompting the identification of crop species and cultivars with enhanced water stress tolerance. Drought responses were studied in four ornamental Sedum species under controlled greenhouse conditions, by withholding watering of the plants for four weeks. Determination of growth parameters (stem length, fresh weight) allowed establishing the relative degree of tolerance of the selected species as S. spurium > S. ochroleucum > S. sediforme > S. album. The levels of photosynthetic pigments (chlorophylls a and b and total carotenoids), oxidative stress [using malondialdehyde (MDA) as marker], non-enzymatic antioxidants (total phenolic componds and total flavonoids) and osmolytes (proline and total soluble sugars) were measured in leaves of control and stressed plants, to correlate drought tolerance with the activation of specific response mechanisms. The results obtained indicate that a higher tolerance to water deficit in Sedum is associated with: a) relatively lower stressinduced degradation of chlorophills and carotenoids, especially of the latter (which does not decrease in water-stressed plants of S. spurium, the most tolerant species); b) no increase in MDA levels; that is, lack of drought-induced oxidative stress and, consequently, no requirement to activate the synthesis and accumulation of antioxidant compounds; and c) higher proline levels in the non-stressed controls, which could be the basis of constitutive mechanisms of tolerance. However, proline concentrations are too low to have any significant osmotic effect, and its likely contribution to water deficit resistance in Sedumwould be due to its activity as 'osmoprotectant'. The identification of these biochemical markers of drought tolerance should help to develop rapid and efficient screening procedures to select Sedum taxa with enhanced tolerance when comparing different species within the genus, or different cultivars within a given species. Abbreviations Caro -total carotenoidsChl a -chlorophyll a Chl b -chlorophyll b MDA -Malondialdehyde (MDA),

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Section: Discussionsupporting

confidence: 78%

Responses of succulents to drought: Comparative analysis of four Sedum (Crassulaceae) species

Koźmińska

Hassan

Wiszniewska

et al. 2019

Scientia Horticulturae

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“…Comparable daily E a fluxes, of over 4 mm/day, were found by [27] for two sedum dominated roofs in New York. Our results are supported by many ecological and plant physiological studies, who point out the water status dependency of the metabolism of Sedum species [28,[40][41][42][43][44][45][46][47]. For instance, in the majority of European species, CAM activity is water status-dependent [42].…”

Section: Discussionsupporting

confidence: 85%

Evaporation from (Blue-)Green Roofs: Assessing the Benefits of a Storage and Capillary Irrigation System Based on Measurements and Modeling

Cirkel

Voortman²,

Veen

et al. 2018

Water

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Worldwide cities are facing increasing temperatures due to climate change and increasing urban density. Green roofs are promoted as a climate adaptation measure to lower air temperatures and improve comfort in urban areas, especially during intensive dry and warm spells. However, there is much debate on the effectiveness of this measure, because of a lack of fundamental knowledge about evaporation from different green roof systems. In this study, we investigate the water and energy balance of different roof types on a rooftop in Amsterdam, the Netherlands. Based on lysimeter measurements and modeling, we compared the water and energy balance of a conventional green roof with blue-green roofs equipped with a novel storage and capillary irrigation system. The roofs were covered either with Sedum or by grasses and herbs. Our measurements and modeling showed that conventional green roof systems (i.e., a Sedum cover and a few centimeters of substrate) have a low evaporation rate and due to a rapid decline in available moisture, a minor cooling effect. Roofs equipped with a storage and capillary irrigation system showed a remarkably large evaporation rate for Sedum species behaving as C3 plants during hot, dry periods. Covered with grasses and herbs, the evaporation rate was even larger. Precipitation storage and capillary irrigation strongly reduced the number of days with dry-out events. Implementing these systems therefore could lead to better cooling efficiencies in cities.

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“…Rapid light curves (RLCs) were recorded using a Junior-PAM (“Heinz WalzGmbH”, Effeltrich, Germany) under actinic illumination of 450 nm. The RLC for each sample was recorded in dark conditions at midnight since Sedum is a succulent capable of switching to the CAM-type of photosynthesis under stress conditions [ 83 ]. For each measurement, the fluorometer provided eight saturation light pulses of 10,000 µmol/m 2 s every 20 s, while actinic light increased from 0 to 625 µmol m −2 s −1 gradually [ 84 ].…”

Section: Methodsmentioning

confidence: 99%

The Reactions of Photosynthetic Capacity and Plant Metabolites of Sedum hybridum L. in Response to Mild and Moderate Abiotic Stresses

Terletskaya

Seitimova

Kudrina

et al. 2022

Plants

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In this article, for the first time, an experimental study of the effect of mild and moderate osmotic stress, NaCl content and the effect of low positive temperature on photosynthetic activity and composition of metabolites of immature plants Sedum hybridum L. is reported. In this representative of the genus Sedum adapted to arid conditions and having the properties of a succulent, a change in photosynthetic activity and an increase in the level of protective metabolites in the shoots were revealed when exposed to mild and moderate stress factors. The results of this study can be used in work on the adaptation of succulent plants to arid conditions, environmental monitoring and work on the directed induction of valuable secondary metabolites in succulents to obtain new herbal medicines.

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Photosynthetic and Transpiration Rates of Three <I>Sedum</I> Species Used for Green Roofs

Cited by 8 publications

References 22 publications

Responses of succulents to drought: Comparative analysis of four Sedum (Crassulaceae) species

Responses of succulents to drought: Comparative analysis of four Sedum (Crassulaceae) species

Evaporation from (Blue-)Green Roofs: Assessing the Benefits of a Storage and Capillary Irrigation System Based on Measurements and Modeling

The Reactions of Photosynthetic Capacity and Plant Metabolites of Sedum hybridum L. in Response to Mild and Moderate Abiotic Stresses

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