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Winter cold-tolerance thresholds in field-grown Miscanthus hybrid rhizomes.

Peixoto Mde M, Friesen PC, Sage RF - J. Exp. Bot. (2015)

Bottom Line: Two artificial freezing protocols were tested: one lowered the temperature continuously by 1°C h(-1) to the treatment temperature and another lowered the temperature in stages of 24h each to the treatment temperature.The results demonstrated that rhizomes from diploid Miscanthus lines have superior cold tolerance that could be exploited to improve performance in more productive polyploid lines.With expected levels of soil insulation, low winter air temperatures should not harm rhizomes of tolerant diploid genotypes of Miscanthus in temperate to sub-boreal climates (up to 60°N); however, the observed winter cold in sub-boreal climates could harm rhizomes of existing polyploid varieties of Miscanthus and thus reduce stand performance.

View Article: PubMed Central - PubMed

Affiliation: University of Toronto, Department of Ecology and Evolutionary Biology, 25 Willcocks Street, Toronto, Ontario, Canada M5S3B2.

No MeSH data available.


Related in: MedlinePlus

Relative conductivity as a function of the lowest temperature at which Miscanthus rhizomes were tested in the continuous-cooling rate experiment. (A) M115; (B) M147; (C) M116; (D) M161; (E) M118. Symbols represent mean±SE (n=18) of the pooled data from all collection times because there was no effect of time (P=0.13) or genotype (P=0.52). The vertical dashed line is the predicted LT50, and horizontal dashed line is the predicted LEL50. The solid line is a logistic regression.
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Figure 5: Relative conductivity as a function of the lowest temperature at which Miscanthus rhizomes were tested in the continuous-cooling rate experiment. (A) M115; (B) M147; (C) M116; (D) M161; (E) M118. Symbols represent mean±SE (n=18) of the pooled data from all collection times because there was no effect of time (P=0.13) or genotype (P=0.52). The vertical dashed line is the predicted LT50, and horizontal dashed line is the predicted LEL50. The solid line is a logistic regression.

Mentions: The LEL50 was equivalent for all genotypes at all collection times and varied between 15 and 22% (Fig. 4). In treatments at –5 °C, the rhizomes of all genotypes exhibited lethal relative conductivity near the predicted LT50 values (Fig. 5). Treatment at –10 °C significantly increased the relative conductivity to above 40% in all rhizomes, none of which was viable after the treatment.


Winter cold-tolerance thresholds in field-grown Miscanthus hybrid rhizomes.

Peixoto Mde M, Friesen PC, Sage RF - J. Exp. Bot. (2015)

Relative conductivity as a function of the lowest temperature at which Miscanthus rhizomes were tested in the continuous-cooling rate experiment. (A) M115; (B) M147; (C) M116; (D) M161; (E) M118. Symbols represent mean±SE (n=18) of the pooled data from all collection times because there was no effect of time (P=0.13) or genotype (P=0.52). The vertical dashed line is the predicted LT50, and horizontal dashed line is the predicted LEL50. The solid line is a logistic regression.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4493781&req=5

Figure 5: Relative conductivity as a function of the lowest temperature at which Miscanthus rhizomes were tested in the continuous-cooling rate experiment. (A) M115; (B) M147; (C) M116; (D) M161; (E) M118. Symbols represent mean±SE (n=18) of the pooled data from all collection times because there was no effect of time (P=0.13) or genotype (P=0.52). The vertical dashed line is the predicted LT50, and horizontal dashed line is the predicted LEL50. The solid line is a logistic regression.
Mentions: The LEL50 was equivalent for all genotypes at all collection times and varied between 15 and 22% (Fig. 4). In treatments at –5 °C, the rhizomes of all genotypes exhibited lethal relative conductivity near the predicted LT50 values (Fig. 5). Treatment at –10 °C significantly increased the relative conductivity to above 40% in all rhizomes, none of which was viable after the treatment.

Bottom Line: Two artificial freezing protocols were tested: one lowered the temperature continuously by 1°C h(-1) to the treatment temperature and another lowered the temperature in stages of 24h each to the treatment temperature.The results demonstrated that rhizomes from diploid Miscanthus lines have superior cold tolerance that could be exploited to improve performance in more productive polyploid lines.With expected levels of soil insulation, low winter air temperatures should not harm rhizomes of tolerant diploid genotypes of Miscanthus in temperate to sub-boreal climates (up to 60°N); however, the observed winter cold in sub-boreal climates could harm rhizomes of existing polyploid varieties of Miscanthus and thus reduce stand performance.

View Article: PubMed Central - PubMed

Affiliation: University of Toronto, Department of Ecology and Evolutionary Biology, 25 Willcocks Street, Toronto, Ontario, Canada M5S3B2.

No MeSH data available.


Related in: MedlinePlus