Effects of different light intensities, CO2 concentrations, temperatures and drought stress on photosynthetic activity in two paleoendemic resurrection plant species Ramonda serbica and R. nathaliae

Rakić, Tamara; Gajić, Gordana; Lazarević, Maja; Stevanović, Branka

doi:10.1016/j.envexpbot.2014.08.003

Cited by 42 publications

(34 citation statements)

References 53 publications

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“…5a) closely matching data obtained from potted plants of R. serbica and R. nathaliae (Rakić et al , 2015). Interestingly, this optimal temperature range is far more persistent within the genus Ramonda than in other Mediterranean species, even if potted and field plants are considered together (Flexas et al , 2014; Rakić et al , 2015). This low variation could reflect a particular set of evolutionary and ecophysiological adaptations leading to a slow but relatively constant assimilation rate, as can also be deduced from low seasonal variability (Fig.…”

Section: Discussionsupporting

confidence: 84%

“…The optimum temperature range of wild R. myconi plants for A n was 20–25°C (Fig. 5a) closely matching data obtained from potted plants of R. serbica and R. nathaliae (Rakić et al , 2015). Interestingly, this optimal temperature range is far more persistent within the genus Ramonda than in other Mediterranean species, even if potted and field plants are considered together (Flexas et al , 2014; Rakić et al , 2015).…”

Section: Discussionsupporting

confidence: 84%

“…Changes in carbon assimilation of desiccation‐tolerant plants within the Gesneriaceae had previously been studied under desiccation/rehydration cycles (Schwab et al , 1989; Markovska et al , 1994; Georgieva et al , 2007; Degl’Innocenti et al , 2008) or under different controlled conditions of light, CO 2 concentration and temperature (Norwood et al , 2000; Peeva & Cornic, 2009; Velitchkova et al , 2013; Rakić et al , 2015). Our study contributes novel photosynthetic data directly collected under natural field conditions for the resurrection plant R. myconi .…”

Section: Discussionmentioning

confidence: 99%

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Born to revive: molecular and physiological mechanisms of double tolerance in a paleotropical and resurrection plant

et al. 2020

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Summary Resurrection plants recover physiological functions after complete desiccation. Almost all of them are native to tropical warm environments. However, the Gesneriaceae include four genera, remnant of the past palaeotropical flora, which inhabit temperate mountains. One of these species is additionally freezing‐tolerant: Ramonda myconi. We hypothesise that this species has been able to persist in a colder climate thanks to some resurrection‐linked traits. To disentangle the physiological mechanisms underpinning multistress tolerance to desiccation and freezing, we conducted an exhaustive seasonal assessment of photosynthesis (gas exchange, limitations to partitioning, photochemistry and galactolipids) and primary metabolism (through metabolomics) in two natural populations at different elevations. R. myconi displayed low rates of photosynthesis, largely due to mesophyll limitation. However, plants were photosynthetically active throughout the year, excluding a reversible desiccation period. Common responses to desiccation and low temperature involved chloroplast protection: enhanced thermal energy dissipation, higher carotenoid to Chl ratio and de‐epoxidation of the xanthophyll cycle. As specific responses, antioxidants and secondary metabolic routes rose upon desiccation, while putrescine, proline and a variety of sugars rose in winter. The data suggest conserved mechanisms to cope with photo‐oxidation during desiccation and cold events, while additional metabolic mechanisms may have evolved as specific adaptations to cold during recent glaciations.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 99%

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Born to revive: molecular and physiological mechanisms of double tolerance in a paleotropical and resurrection plant

et al. 2020

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“…R. myconi leaves dramatically reduce their area and curl during drying so the abaxial side, which is covered with brownish hairs, is then exposed to the light. The same response has also been observed in other species of the genus Ramonda, and is most likely part of the photoprotective strategy upon drying (Rakić et al 2015, Rakić et al 2017). The high chlorophyll content retained in the leaves of R. myconi after drying (i.e.…”

Section: Desiccation Tolerance In R Myconisupporting

confidence: 69%

“…Only a couple of works aimed at unraveling its ecology Riba 2002, Riba et al 2002), and very scarce literature regards its ecophysiological performance (Schwab et al 1989). This, contrasts with the extensive ecophysiological assessment of its Balkan relatives R. serbica, R. nathaliae and H. rhodopensis (Müller et al 1997, Georgieva et al 2007, Degl'Innocenti et al 2008, Dubreuil et al 2008, Rakić et al 2015, Rapparini et al 2015, with which R. myconi shares habitat preferences: i.e. limestone crevices.…”

Section: Introductionmentioning

confidence: 93%

First evidence of freezing tolerance in a resurrection plant: insights into molecular mobility and zeaxanthin synthesis in the dark

Fernández‐Marín

Neuner

Kuprian

et al. 2018

Physiologia Plantarum

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The photoprotective mechanisms of desiccation tolerance and freezing tolerance and their relation to molecular mobility (cell vitrification) were assessed in a single model: the exceptional subalpine and resurrection plant Ramonda myconi. Dehydrated leaves showed a drop in maximal photochemical efficiency of PSII (Fv/Fm) accompanied by synthesis of zeaxanthin (Z), even in the dark, which was limited by cell vitrification after complete desiccation. The recovery of Fv/Fm after a severe drying treatment (7 days at 50% relative humidity) confirmed the tolerance of R. myconi leaves to desiccation. In winter, R. myconi plants showed a highly dynamic component of photoinhibition. Interestingly, the potential activity of the enzyme violaxanthin de‐epoxidase (VDE) occurred at −7°C, below the freezing temperature range of the leaves (−2 ± 2°C) and even in the dark. This suggests that, in nature, the enzyme can still be active in frozen leaves, as long as they are above the glass transition temperature. The drop in Fv/Fm and increase in Z were reversible upon rehydration and thawing, respectively, but were not perfectly matched, suggesting that both Z‐independent and Z‐dependent forms of sustained dissipation are occurring. Overall, our data reinforce the light‐independent activity of the VDE enzyme under stress and suggest that Z‐accumulation could occur in darkness in a scenario when temperatures drop dramatically in the night under natural conditions.

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Phytoremediation of Agricultural Pollutants

Khan

Cheema

Anum

et al. 2020

Concepts and Strategies in Plant Sciences

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Effects of different light intensities, CO2 concentrations, temperatures and drought stress on photosynthetic activity in two paleoendemic resurrection plant species Ramonda serbica and R. nathaliae

Cited by 42 publications

References 53 publications

Born to revive: molecular and physiological mechanisms of double tolerance in a paleotropical and resurrection plant

Born to revive: molecular and physiological mechanisms of double tolerance in a paleotropical and resurrection plant

First evidence of freezing tolerance in a resurrection plant: insights into molecular mobility and zeaxanthin synthesis in the dark

Phytoremediation of Agricultural Pollutants

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