Lipid content in leaves of Deschampsia antarctica from the maritime antarctic

Zúñiga, Gustavo E.; Alberdi, Miren; Fernández, Julio; Montiel, Pedro O.; Corcuera, Luís J.

doi:10.1016/s0031-9422(00)90335-2

Cited by 23 publications

(13 citation statements)

References 14 publications

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“…To function at low temperatures plants must have membranes with sufficient fluidity, without which normal metabolism would not be possible. The studies by Zúñiga et al (1994Zúñiga et al ( , 1996 that of other grasses while the soluble carbohydrates level is higher than in cereals. Alberdi et al (2002) suggested that carbohydrate accumulation could be related to enhanced freezing tolerance of this species.…”

Section: Discussionmentioning

confidence: 96%

Carbohydrates in Colobanthus quitensis and Deschampsia antarctica

Piotrowicz-Cieślak¹,

Giełwanowska²,

Bochenek³

et al. 2011

Acta Soc Bot Pol

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Section: Discussionmentioning

confidence: 96%

Carbohydrates in Colobanthus quitensis and Deschampsia antarctica

Piotrowicz-Cieślak¹,

Giełwanowska²,

Bochenek³

et al. 2011

Acta Soc Bot Pol

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“…The native Antarctic vegetation must have one or various mechanisms that allow the maintenance of metabolism at low temperature during the Antarctic summer (growing season) and survival during winter. Previous studies have shown that D. antarctica does not have unusual contents in polar lipids or degree of unsaturation of fatty acids compared with other Poaceae (Zúñiga et al 1994). High amounts of sucrose and fructans are found mainly towards the end of summer under field conditions (Zúñiga et al 1996).…”

Section: Introductionmentioning

confidence: 94%

Cold resistance in Antarctic angiosperms

Bravo¹,

Ulloa²,

Zúñiga³

et al. 2001

Physiologia Plantarum

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124

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Deschampsia antarctica Desv. (Poaceae) and Colobanthus quitensis (Kunth) Bartl. (Cariophyllaceae) are the only two vascular plants that have colonized the Maritime Antarctic. The primary purpose of the present work was to determine cold resistance mechanisms in these two Antarctic plants. This was achieved by comparing thermal properties of leaves and the lethal freezing temperature to 50% of the tissue (LT50). The grass D. antarctica was able to tolerate freezing to a lower temperature than C. quitensis. The main freezing resistance mechanism for C. quitensis is supercooling. Thus, the grass is mainly a freezing‐tolerant species, while C. quitensis avoids freezing. D. antarctica cold acclimated; thus, reducing its LT50. C. quitensis showed little cold‐acclimation capacity. Because day length is highly variable in the Antarctic, the effect of day length on freezing tolerance, growth, various soluble carbohydrates, starch, and proline contents in leaves of D. antarctica growing in the laboratory under cold‐acclimation conditions was studied. During the cold‐acclimation treatment, the LT50 was lowered more effectively under long day (21/3 h light/dark) and medium day (16/8) light periods than under a short day period (8/16). The longer the day length treatment, the faster the growth rate for both acclimated and non‐acclimated plants. Similarly, the longer the day treatment during cold acclimation, the higher the sucrose content (up to 7‐fold with respect to non‐acclimated control values). Oligo and polyfructans accumulated significantly during cold acclimation only with the medium day length treatment. Oligofructans accounted for more than 80% of total fructans. The degrees of polymerization were mostly between 3 and 10. C. quitensis under cold acclimation accumulated a similar amount of sucrose than D. antarctica, but no fructans were detected. The suggestion that survival of Antarctic plants in the Antarctic could be at least partially explained by accumulation of these substances is discussed.

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“…C. quitensis and D. antarctica have developed unique anatomical structures which enable them to adapt to severe climates, including xerophytic leaves (Romero et al 1999), structural plasticity of chloroplasts and mitochondria (Giełwanowska 2003;Giełwanowska and Szczuka 2005) as well as organs with highly effective photosynthetic function at low temperatures (Bravo et al 2007). Survival at sub-zero temperatures is probably conditioned by the accumulation of protective proteins (Bravo and Griffith 2005;John et al 2009), fats (Zúñiga et al 1994), sugars and polyols (Montiel and Cowan 1993;Zúñiga et al 1996). During acclimatization to freeze stress, Deschampsia antarctica tissues accumulate very high amounts of sucrose which reach up to 36 % of dry matter content (Zúñiga et al 1996).…”

Section: Introductionmentioning

confidence: 99%

Changes in soluble carbohydrates in polar Caryophyllaceae and Poaceae plants in response to chilling

2014

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Four species of flowering plants comprising Arctic populations of Cerastium alpinum and Poa arctica var. vivipara and indigenous Antarctic species Colobanthus quitensis and Deschampsia antarctica were investigated. Plants derived from natural origins were grown in an experimental greenhouse in Poland (53°47 0 N and 20°30 0 E latitude). Plants for experiment were collected during spring of 2010. Soluble carbohydrates in the intact shoots of C. alpinum and C. quitensis, polar plants of the family Caryophyllaceae, and D. antarctica and P. arctica var. vivipara, representatives of the family Poaceae, were analyzed by gas chromatography, and their involvement in the plants' response to chilling stress was examined. Plant tissues of the examined families growing in a greenhouse conditions (18-20°C, short day 10/14 h light/darkness) differed in the content and composition of soluble carbohydrates. In addition to common monosaccharides, myo-inositol and sucrose, Caryophyllaceae plants contained raffinose family oligosaccharides (RFOs), D-pinitol and mono-galactosyl pinitols. RFOs and D-pinitol were not detected in plants of the family Poaceae which contain 1-kestose, a specific tri-saccharide. The accumulation of significant quantities of sucrose in all investigated plants, RFOs in Caryophyllaceae plants and 1-kestose in Poaceae plants in response to chilling stress (4°C for 48 h with a long day photoperiod, 20/4 h) indicates that those compounds participate in the stress response. The common sugar accumulating in cold stress response and probably most important for chilling tolerance of four investigated plants species seems to be sucrose. On the other hand, the accumulation of above-mentioned carbohydrates during chilling stress can be a return to sugars metabolism, occurring in natural environmental conditions. No changes in D-pinitol concentrations were observed in the tissues of C. alpinum and C. quitensis plants subjected to both low and elevated temperatures, which probably rules out the protective effects of D-pinitol in response to cold stress.

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Lipid content in leaves of Deschampsia antarctica from the maritime antarctic

Cited by 23 publications

References 14 publications

Carbohydrates in Colobanthus quitensis and Deschampsia antarctica

Carbohydrates in Colobanthus quitensis and Deschampsia antarctica

Cold resistance in Antarctic angiosperms

Changes in soluble carbohydrates in polar Caryophyllaceae and Poaceae plants in response to chilling

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