Cold acclimation in cultivars of Avena sativa

Alberdi, Miren; Corcuera, Luís J.; Maldonado, Carlos A.; Barrientos, Mónica; Fernández, Julio; Henríquez, Omar

doi:10.1016/0031-9422(93)85396-9

Cited by 24 publications

(22 citation statements)

References 26 publications

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“…SS not only supplies plant energy and nutrients, but also regulates physiological activity of downstream cold-related genes as primary messengers in signal transduction (Ma et al 2009). Therefore, it has been confirmed that levels of the two substances increase in various plants under low-temperature stress (Alberdi et al 1993;Yano et al 2005). In this study, at temperatures higher than -40°C, Pro and SS content for two species increased with declining temperature, indicating their improved cold-resistance by increasing osmotic adjustment capacity.…”

Section: Discussionsupporting

confidence: 71%

Cold hardiness estimation of Pinus densiflora var. zhangwuensis based on changes in ionic leakage, chlorophyll fluorescence and other physiological activities under cold stress

Meng

Bai

et al. 2015

J. For. Res.

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Pinus densiflora var. zhangwuensis grows fast, and its drought and salinity resistance are better than Pinus sylvestris var. mongolica. We compared cold hardiness and mechanisms of cold hardiness between the two species, to provide a theoretical basis for promoting and applying P. densiflora var. zhangwuensis in cold regions. A cold stress experiment was carried out on 3-year-old plantlets of P. densiflora var. zhangwuensis and P. sylvestris var. mongolica after hardening at five temperature regimes, 5, -10, -20, -40, and -60°C, respectively. Some indices of needle samples for both species were measured, such as relative conductivity (REL), maximum photochemical efficiency (F v /F m ), malondialdehyde (MDA), catalase (CAT), proline (Pro), soluble sugar (SS), and stomata density. REL and MDA values of both species after hardening had the same trend of increasing, but the trend was opposite in F v /F m value with increasing cold stress. Compared with P. sylvestris var. mongolica, the P. densiflora var. zhangwuensis had smaller increases in REL and MDA, and a smaller decline in F v /F m during cold stress. Compared to the control, REL growth of P. densiflora var. zhangwuensis and P. sylvestris var. mongolica at -60°C were 0.41 and 0.60, and MDA growth was 29.94 mol g -1 FW and 47.80 mol g -1 FW, and F v /F m declines were 0.08 and 0.27. Half-lethal temperatures (LT 50 ) calculated by logistic equation for P. densiflora var. zhangwuensis and P. sylvestris var. mongolica were -58.23 and -50.34°C, respectively. These data suggest that cold resistance of P. densiflora var. zhangwuensis is stronger than that of P. sylvestris var. mongolica. Cold-resistance mechanisms of the two species differed. In response to cold stress, P. sylvestris var. mongolica had strong osmotic adjustment ability because of higher Pro and SS content, while P. densiflora var. zhangwuensis had strong antioxidant ability due to stronger CAT activity. Stomata density and diameter of P. densiflora var. zhangwuensis were smaller, as were single leaf area and number of leaves per plant, both characteristics promoting survival in a cold environment. Greater shoot height and total biomass of seedlings of P. densiflora var. zhangwuensis might be another reason for its stronger cold tolerance.

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Section: Discussionsupporting

confidence: 71%

Cold hardiness estimation of Pinus densiflora var. zhangwuensis based on changes in ionic leakage, chlorophyll fluorescence and other physiological activities under cold stress

Meng

Bai

et al. 2015

J. For. Res.

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“…Low temperatures and SDs appeared to increase tolerance via an increase in carbohydrate content, particularly sucrose in woody plants (Aronsson et al 1976). Carbohydrate accumulation is required for hardening in cereals (Levitt 1980; Alberdi et al 1993; Maldonado et al 1997).…”

Section: Introductionmentioning

confidence: 99%

Cold resistance in Antarctic angiosperms

Bravo¹,

Ulloa²,

Zúñiga³

et al. 2001

Physiologia Plantarum

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126

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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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“…Esto confirmaría las observaciones de que el almidón se hidroliza en carbohidratos por bajas temperaturas (Levit 1980). Por otra parte, el almidón se desdobla en azúcares simples, como un medio de protección contra las bajas temperaturas, ya que éstos actúan como sustancias osmorreguladoras frente a diferentes tipos de estrés (Alberdi et al 1993). También se pudo observar que los individuos siempreverdes, a pesar de tener la posibilidad de fotosintetizar en los períodos favorables y transitorios de invierno, debido a que no pierden su follaje, no obtuvieron concentraciones mayores de carbohidratos que las especies caducifolias.…”

Section: Carbohidratos Solubles Totalesunclassified

“…El aumento de proteínas, específicamente de proteína libre, también se reportó en hojas de N. dombeyi, donde se observó que a medida que se acercaba el período otoño-invierno aumentaba la concentración de prolina (Mesa et al 1986). El aumento de proteínas solubles también fue observado en especies de Solanum (Barrientos et al 1994) y en cultivos de Avena sativa aclimatada al frío (Alberdi et al 1993). Dicha aclimatación podría asemejar las bajas temperaturas de las estaciones de otoño e invierno para las especies de Nothofagus.…”

Section: Carbohidratos Solubles Totalesunclassified