Winter photosynthetic activity of twenty temperate semi-desert sand grassland species

Tuba, Zoltán; Csintalan, Zsolt; Szente, K.; Nagy, Zoltán; Fekete, G.; Larcher, Walter; Lichtenthaler, Hartmut K.

doi:10.1016/j.jplph.2007.10.017

Cited by 12 publications

(8 citation statements)

References 45 publications

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“…These results show that low daily minimum temperatures in spring restricted the water loss, but not the photosynthesis of F. vaginata. This is consistent with previous studies reporting that this grass exhibits a considerable net CO2 assimilation rate even in winter (Tuba et al 2008). As observed for F. vaginata, both gs and A showed negative relationships with Tmax in spring also for P. alba.…”

Section: Responses To Temperaturesupporting

confidence: 93%

Plant ecophysiological responses to drought, nocturnal warming and variable climate in the Pannonian sand forest-steppe: results of a six-year climate manipulation experiment

2017

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The impacts of year-round nocturnal warming or late spring rain exclusion on three plant functional types were studied in a plot-scale climate simulation experiment in a semiarid sand forest-steppe of Central Hungary. Ecophysiological traits were followed through six years for the C3 bunch grass Festuca vaginata, the spreading C4 grass Cynodon dactylon and shrubsized root suckers of Populus alba. In general, experimental treatments had slighter effects than weather fluctuations yielding extremities did. Populus alba responded to nocturnal warming with developing slenderer leaves. Rain exclusion reduced leaf physiological activity or growth, but only during or just after the treatment, and in certain years. When assessing treatment and background climatic variation effects together, in spring, leaf area growth was consistently stimulated by increasing temperature, but decreased with longer rainless periods for P. alba and F. vaginata. Physiological responses in spring indicated low temperature limitation for C. dactylon, and both low and high temperature control for P. alba. Longer summer droughts reduced leaf gas exchange, particularly for F. vaginata with substantial drop in photochemical activity and chlorophyll content. These results suggest that shallow rooted C3 bunch grasses can be the most susceptible to climatic variation, thus their abundance is expected to decline in the Pannonian forest-steppe. In contrast, plants having deeper roots and clonal integration will probably be less affected by the projected warming and drying climate.C4 photosynthesis or southern geographical distribution may also be beneficial, thus, the abundance of such species is expected to diminish less or even increase.

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Section: Responses To Temperaturesupporting

confidence: 93%

Plant ecophysiological responses to drought, nocturnal warming and variable climate in the Pannonian sand forest-steppe: results of a six-year climate manipulation experiment

2017

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“…In all three experimental species, R FD values were found comparable to earlier investigations on Cladonia sp. (Tuba et al 2008) measured at physiological temperature. The authors reported range of R FD values between 0.5-1.5 which correspond to data recorded at 25 and 5°C (see Table 2).…”

Section: Resultsmentioning

confidence: 99%

Features of chlorophyll fluorescence transients can be used to investigate low temperature induced effects on photosystem II of algal lichens from polar regions ( Short Communication )

Mishra¹,

Hájek²,

Tuháčková³

et al. 2015

Czech Polar Rep.

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Chlorophyll fluorescence is an effective tool for investigating characteristics of any photosynthesizing organisms and its responses due to different stressors. Here, we have studied a short-term temperature response on three Antarctic green algal lichen species: Umbilicaria antarctica, Xanthoria elegans, and Rhizoplaca melanophtalma. We measured slow chlorophyll fluorescence transients in these Antarctic lichen species during slowely cooling of thallus temperature from 20°C to 5, 0 and-5°C with 20 minute acclimation at each temperature. The measurements were supplemented with saturation pulses for the analysis of chlorophyll fluorescence parameters: maximum yield of PS II photochemistry (F V /F M), effective quantum yield of PS II photochemistry ( PSII) and quenching parameters. In response to decreasing thallus temperature, we observed species-specific changes in chlorophyll fluorescence parameters as well as in the shape of the chlorophyll fluorescence transients. We propose that species-specific changes in the slow phase of chlorophyll fluorescence transients can be potentially used as indicators of freezing stress in photosynthetic apparatus of lichen algal photobionts.

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“…For radiation exposures, the irradiance of PAR selected as control (P1) was 187 μmol · m 2 · s −1 , as a mean value for winter months (Tuba et al. ). The experiments consisted in modifying a single parameter at a time (ammonium concentration as a source of nitrogen; conductivity and temperature).…”

Section: Methodsmentioning

confidence: 99%

“…In all the experiments, the average values of the environmental conditions in the Ch ıcamo River throughout the year were used as a control: temperature of 20°C, 0 lM of NH 4 Cl, and 2,850 lS Á cm À1 of conductivity. For radiation exposures, the irradiance of PAR selected as control (P1) was 187 lmol Á m 2 Á s À1 , as a mean value for winter months (Tuba et al 2008). The experiments consisted in modifying a single parameter at a time (ammonium concentration as a source of nitrogen; conductivity and temperature).…”

Section: Methodsmentioning

confidence: 99%

Effects of global change factors on fatty acids and mycosporine‐like amino acid production in Chroothece richteriana (Rhodophyta)

González-Silvera

Perez

Korbee

et al. 2017

Journal of Phycology

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Under natural conditions, Chroothece richteriana synthesizes a fairly high proportion of fatty acids. However, nothing is known about how environmental changes affect their production, or about the production of protective compounds, when colonies develop under full sunshine with high levels of UV radiation. In this study, wild colonies of C. richteriana were subjected to increasing temperature, conductivity, ammonium concentrations and photosynthetically active radiation (PAR), and UV radiations to assess the potential changes in lipid composition and mycosporine-like amino acids (MAAs) concentration. The PERMANOVA analysis detected no differences for the whole fatty acid profile among treatments, but the percentages of α-linolenic acid and total polyunsaturated fatty acids increased at the lowest assayed temperature. The percentages of linoleic and α-linolenic acids increased with lowering temperature. γ-linolenic and arachidonic acids decreased with increasing conductivity, and a high arachidonic acid concentration was related with increased conductivity. The samples exposed to UVB radiation showed higher percentages of eicosapentaenoic acid and total monounsaturated fatty acids, at the expense of saturated fatty acids. MAAs accumulation increased but not significantly at the lowest conductivity, and also with the highest PAR and UVR exposure, while ammonium and temperature had no effect. The observed changes are probably related with adaptations of both membrane fluidity to low temperature, and metabolism to protect cells against UV radiation damage. The results suggest the potential to change lipid composition and MAAs concentration in response to environmental stressful conditions due to climate change, and highlight the interest of the species in future research about the biotechnological production of both compound types.

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Winter photosynthetic activity of twenty temperate semi-desert sand grassland species

Cited by 12 publications

References 45 publications

Plant ecophysiological responses to drought, nocturnal warming and variable climate in the Pannonian sand forest-steppe: results of a six-year climate manipulation experiment

Plant ecophysiological responses to drought, nocturnal warming and variable climate in the Pannonian sand forest-steppe: results of a six-year climate manipulation experiment

Features of chlorophyll fluorescence transients can be used to investigate low temperature induced effects on photosystem II of algal lichens from polar regions ( Short Communication )

Effects of global change factors on fatty acids and mycosporine‐like amino acid production in Chroothece richteriana (Rhodophyta)

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