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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

Survivability of Miscanthus rhizomes as a function of relative conductivity in the continuous-cooling experiment. (A) M115; (B) M147; (C) M116; (D) M161; (E) M118.Symbols are observed values (mean±SE, n=6), lines show predicted responses using logistic regression. Filled diamonds, November 2009; open circles, January 2010; filled stars, August 2010. LEL50 is the relative conductivity at which a rhizome population is predicted to exhibit 50% mortality. Collection time (P=0.052) and genotype (P=0.051) differences were not significant.
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Figure 4: Survivability of Miscanthus rhizomes as a function of relative conductivity in the continuous-cooling experiment. (A) M115; (B) M147; (C) M116; (D) M161; (E) M118.Symbols are observed values (mean±SE, n=6), lines show predicted responses using logistic regression. Filled diamonds, November 2009; open circles, January 2010; filled stars, August 2010. LEL50 is the relative conductivity at which a rhizome population is predicted to exhibit 50% mortality. Collection time (P=0.052) and genotype (P=0.051) differences were not significant.

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)

Survivability of Miscanthus rhizomes as a function of relative conductivity in the continuous-cooling experiment. (A) M115; (B) M147; (C) M116; (D) M161; (E) M118.Symbols are observed values (mean±SE, n=6), lines show predicted responses using logistic regression. Filled diamonds, November 2009; open circles, January 2010; filled stars, August 2010. LEL50 is the relative conductivity at which a rhizome population is predicted to exhibit 50% mortality. Collection time (P=0.052) and genotype (P=0.051) differences were not significant.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

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

Figure 4: Survivability of Miscanthus rhizomes as a function of relative conductivity in the continuous-cooling experiment. (A) M115; (B) M147; (C) M116; (D) M161; (E) M118.Symbols are observed values (mean±SE, n=6), lines show predicted responses using logistic regression. Filled diamonds, November 2009; open circles, January 2010; filled stars, August 2010. LEL50 is the relative conductivity at which a rhizome population is predicted to exhibit 50% mortality. Collection time (P=0.052) and genotype (P=0.051) differences were not significant.
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