Frost hardiness, carbohydrates and bud morphology of<i>Picea abies</i>seedlings after different lengths of freezer storage

Luoranen, Jaana; Riikonen, Johanna; Rikala, Risto; Sutinen, Sirkka

doi:10.1080/02827581.2012.666566

Cited by 7 publications

(4 citation statements)

References 26 publications

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“…Seedlings gradually consume their carbohydrates reserves during refrigerated storage especially if the temperature is above the freezing point when the respiration happens even faster (Ritchie 1982;Luoranen et al 2012). It has been observed that seedlings of Norway spruce and Scots pine can start the process of de-hardening even while still being in dark cold storage, most likely due to depletion of soluble sugars (Ögren et al 1997;Lennartsson and Ögren 2002).…”

Section: Discussionmentioning

confidence: 99%

Treatments for induction of cold hardiness inPicea abies(L.) Karst. andPinus sylvestrisL. seedlings pre-cultivated under light-emitting diodes – impact of photoperiod and temperature including energy consumption and seedling quality after cold storage

Velasco

2020

Scandinavian Journal of Forest Research

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Section: Discussionmentioning

confidence: 99%

Treatments for induction of cold hardiness inPicea abies(L.) Karst. andPinus sylvestrisL. seedlings pre-cultivated under light-emitting diodes – impact of photoperiod and temperature including energy consumption and seedling quality after cold storage

Velasco

2020

Scandinavian Journal of Forest Research

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“…However, in our earlier study on one and a half year old Norway spruce seedlings, extending the freezer storage period from 6 to 8.5 months did not cause alterations in the FH of needles, stem, and buds; concentration of starch and soluble sugars; or incidence of seedling damage. Therefore, the conclusion was made that two year old Norway spruce seedlings can be freezer-stored safely for eight to nine months [38].…”

Section: Storage Durationmentioning

confidence: 99%

An Assessment of Storability of Norway Spruce Container Seedlings in Freezer Storage as Affected by Short-Day Treatment

Riikonen

Luoranen

2020

Forests

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Determination of safe times at which to transfer seedlings to freezer storage is problematic in forest tree nurseries. The present study aimed to determine the relationship between pre-storage frost hardiness (FH) of different plant parts, dry matter content (DMC), chilling hours (the sum of hours when temperature was between −5 °C and +5 °C), and post-storage vitality, and the impact of short-day (SD) treatment on these relationships. One and a half year old control seedlings and SD-treated seedlings of Norway spruce were transferred to freezer storage (−3 °C) on five occasions during autumn. On each occasion, the FH of buds, needles, stem, and roots, as well as DMC, were determined, and chilling hours were calculated. The vitality of the freezer-stored seedlings was determined through their root growth capacity in the subsequent spring, and through the field performance of the seedlings (shoot growth and seedling damage) at the end of the following two growing seasons. Seedlings were considered to be storable when the FH of the needles was at least −25 °C, and the FH of the roots was about −10 °C in both treatments. Early storage reduced the vitality of the seedlings. SD treatment did not advance the storability of the seedlings, although it alleviated some of the negative effects of early storage by improving the FH of needles and stem, but not that of the roots. The DMC value, indicating storability, was higher for SD-treated seedlings than for control seedlings. When data from five experiments conducted in Suonenjoki were combined, it was found that the relationship between accumulation of chilling hours and needle FH was dependent on nursery treatment and assessment year, which reduces the reliability of using chilling hours in predicting the storability of Norway spruce seedlings. The predicted climate change may complicate the fall acclimation of seedlings. New, user-friendly methods for determining storability of seedlings are urgently needed.

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“…Seedlings' carbohydrate reserves are known to gradually deplete during cold conditions (Ritchie 1982) which could be a reason for the decline in root ( Figure 5) and shoot (data not shown) growth after the longer duration in storage. Luoranen et al (2012) reported changes in sugar concentrations in seedlings as a result of freezer storage. In addition to this, young transplants have smaller carbohydrate reserves compared to conventional seedlings which could strengthen this effect.…”

Section: Vitality Testsmentioning

confidence: 99%

Evaluating methods for storability assessment and determination of vitality status of container grown Norway spruce transplants after frozen storage

Wallin

Gräns

Stattin

et al. 2019

Scandinavian Journal of Forest Research

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Frost hardiness, carbohydrates and bud morphology ofPicea abiesseedlings after different lengths of freezer storage

Cited by 7 publications

References 26 publications

Treatments for induction of cold hardiness inPicea abies(L.) Karst. andPinus sylvestrisL. seedlings pre-cultivated under light-emitting diodes – impact of photoperiod and temperature including energy consumption and seedling quality after cold storage

Treatments for induction of cold hardiness inPicea abies(L.) Karst. andPinus sylvestrisL. seedlings pre-cultivated under light-emitting diodes – impact of photoperiod and temperature including energy consumption and seedling quality after cold storage

An Assessment of Storability of Norway Spruce Container Seedlings in Freezer Storage as Affected by Short-Day Treatment

Evaluating methods for storability assessment and determination of vitality status of container grown Norway spruce transplants after frozen storage

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