Asparagus cultivars with varying adaptation to southern Ontario differ for induction of freezing tolerance in the fall

Panjtandoust, Mahmoud; Wolyn, David J.

doi:10.1139/cjps-2015-0242

Cited by 8 publications

(9 citation statements)

References 26 publications

(31 reference statements)

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“…The ranking of LT 50 values for three cultivars at the end of the spring sampling period in both years, GM<JG<UC, is consistent with observations from cold acclimation of seedlings in controlled environments (Kim and Wolyn, 2015;Landry and Wolyn, 2012) and early fall acclimation of crowns in the field (Panjtandoust and Wolyn, 2016). Thus, fall and spring freezing tolerance is correlated in these three genotypes.…”

Section: Discussionsupporting

confidence: 85%

“…Thus, fall and spring freezing tolerance is correlated in these three genotypes. Cultivars differed for LT 50 values at early fall samplings with values for GM lower than those for UC; however, they did not differ in late fall (Panjtandoust and Wolyn, 2016). Conversely, the two cultivars did not differ for the early spring sampling dates but did differ at the final sampling dates in this study.…”

Section: Discussioncontrasting

confidence: 68%

“…Freezing tolerance was associated with low percentage water and high proline, sucrose, and low-and high-molecular-weight fructan (HF) concentrations in the crown. Analysis of LT 50 during fall acclimation for the three cultivars in the field indicated that on specific sampling dates in early fall, GM crowns had greater freezing tolerance than those of UC, and values of JG were intermediate (Panjtandoust and Wolyn, 2016). Interestingly, all three cultivars had similar LT 50 values at the start of winter.…”

mentioning

confidence: 94%

“…Direct measurements of LT 50 and associated physiological parameters among the asparagus cultivars during natural fall or artificial cold acclimation suggested that varying levels of freezing tolerance can explain differences in persistence and adaptation (Kim and Wolyn, 2015;Landry and Wolyn, 2012;Panjtandoust and Wolyn, 2016). However, the timing of deacclimation or dehardening in the spring may also be important for survival.…”

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confidence: 99%

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Freezing Tolerance Attributes during Spring Deacclimation for Three Asparagus Cultivars with Varying Adaptation to Southern Ontario

Panjtandoust

Wolyn

2016

J. Amer. Soc. Hort. Sci.

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Winterhardiness in asparagus (Asparagus officinalis) may be related to proper cold acclimation and induction of freezing tolerance in the fall, levels and maintenance of freezing tolerance in the winter, and the timing of deacclimation in the spring. Premature deacclimation and the inability to reacclimate could result in crown damage from spring freeze-thaw cycles. A field experiment was conducted, replicated over 2 years, to determine how three cultivars with varying adaptation to southern Ontario deacclimate in the spring by assessing LT50 (the temperature at which 50% of plants die) and biochemical and physiological parameters associated with freezing tolerance. ‘UC 157’ (UC), the least-adapted cultivar, deacclimated after soil temperatures rose above freezing; LT50 values increased linearly over time and were unaffected by fluctuations in soil temperature. ‘Jersey Giant’ (JG), a cultivar with moderate adaptation, rapidly deacclimated with increased soil temperature but appeared to partially reacclimate as temperatures decreased. For ‘Guelph Millennium’ (GM), the most-adapted cultivar, LT50 values did not change, maintaining the greatest levels of freezing tolerance during the spring sampling period. Although LT50 values did not differ among cultivars on the first spring sampling date, ranking for freezing tolerance at the final sampling in each year was GM>JG>UC, which is consistent with adaptation. Rhizome traits were most associated with freezing tolerance and included high concentrations of low-molecular-weight fructans (LFs), glucose, and proline and low percentage water and sucrose concentration. Overall, data suggest that the timing of deacclimation and loss of freezing tolerance in the spring may significantly affect winterhardiness; cultivars that lose freezing tolerance early and cannot reacclimate could suffer most from late spring freeze-thaw cycles.

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Section: Discussionsupporting

confidence: 85%

Section: Discussioncontrasting

confidence: 68%

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confidence: 94%

mentioning

confidence: 99%

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Freezing Tolerance Attributes during Spring Deacclimation for Three Asparagus Cultivars with Varying Adaptation to Southern Ontario

Panjtandoust

Wolyn

2016

J. Amer. Soc. Hort. Sci.

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“…A series of physiological, biochemical, and molecular changes induced by photoperiod and temperature maximize the freezing tolerance of plants during acclimation 3 – 5 . Earlier research indicated that the hardiness of perennial ryegrass ( Lolium perenne L.) 6 and asparagus ( Asparagus officinalis L.) 7 , 8 is negatively associated with increasing water contents. A decrease in the water content can lower the freezing point of cells, whereas an increase in the water content may result in mechanical damages due to extracellular freezing as well as an increase in the ice propagation rate in tissues 7 – 9 .…”

Section: Introductionmentioning

confidence: 99%

Metabolomic changes in crown of alfalfa (Medicago sativa L.) during de-acclimation

Tong

et al. 2022

Sci Rep

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Alfalfa is a high-quality forage legume species that is widely cultivated at high latitudes worldwide. However, a decrease in cold tolerance in early spring seriously affects regrowth and persistence of alfalfa. There has been limited research on the metabolomic changes that occur during de-acclimation. In this study, a liquid chromatography–mass spectrometry system was used to compare the metabolites in two alfalfa cultivars during a simulated overwintering treatment. In four pairwise comparisons, 367 differential metabolites were identified, of which 31 were annotated according to the Kyoto Encyclopedia of Genes and Genomes (KEGG) database. Many of these metabolites were peptides, carbohydrates, and lipids. At the subclass level, 17 major pathways were revealed to be significantly enriched (P < 0.05). The main differential metabolites included amino acids, peptides and analogs, carbohydrates, and glycerol phosphocholines. A metabolomic analysis showed that the up-regulation of unsaturated fatty acids and amino acids as well as the enhancement of the related metabolic pathways might be an effective strategy for increasing alfalfa cold tolerance. Furthermore, glycerophospholipid metabolism affects alfalfa cold tolerance in early spring. Study results provide new insights about the changes in alfalfa metabolites that occur during de-acclimation, with potential implications for the selection and breeding of cold-tolerant cultivars.

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Fall defoliation affects acquisition of freezing tolerance and spring regrowth in asparagus

Nolet

Wolyn

2020

Can. J. Plant Sci.

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Asparagus (Asparagus officinalis L.) acquires freezing tolerance during a period of fall acclimation when both photoperiod and temperature decrease. The above-ground vegetative growth may be important for sensing changing environmental conditions and translocating compounds to the below-ground crown. Defoliation experiments, repeated over 2 yr, were conducted by removing fern in mid-August, -September, and -October and evaluating crown metabolites and LT50, the temperature at which 50% of plants die, at monthly intervals to mid-November. Spring emergence and vigor were also assessed in separate experiments. In the first year, only mid-August defoliation affected LT50 values, decreasing freezing tolerance, which was associated with diminished rhizome proline concentration and storage root low- and high-molecular-weight fructan concentrations. All defoliation treatments in the second year decreased LT50 values, or increased freezing tolerance, possibly resulting from an interaction between defoliation and drought which increased rhizome sucrose concentrations. Defoliation decreased spring vigor in both experiments; the response was proportional to the earliness of the treatment and associated with rhizome and storage root fructan levels. Crowns of plants defoliated in mid-August had increasing proline concentrations during the fall, similar to control plants, suggesting the below-ground organs may have sensed soil temperature to cold acclimate. Autumn defoliation to control disease, harvest seed, or implement other cultural practices can reduce vigor and likely attenuate long-term performance of a plantation.

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Asparagus cultivars with varying adaptation to southern Ontario differ for induction of freezing tolerance in the fall

Cited by 8 publications

References 26 publications

Freezing Tolerance Attributes during Spring Deacclimation for Three Asparagus Cultivars with Varying Adaptation to Southern Ontario

Freezing Tolerance Attributes during Spring Deacclimation for Three Asparagus Cultivars with Varying Adaptation to Southern Ontario

Metabolomic changes in crown of alfalfa (Medicago sativa L.) during de-acclimation

Fall defoliation affects acquisition of freezing tolerance and spring regrowth in asparagus

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