Endogenous Gibberellins and Dormancy in Beechnuts

Fernández, Helena; Doumas, Patrick; Falleri, E.; Muller, Claudine; Bonnet-Masimbert, Marc

doi:10.1007/978-94-011-5716-2_35

Cited by 7 publications

(7 citation statements)

References 13 publications

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“…This contradicts the results of Fernandez et al (1997), who also increased the mc of dormant beechnuts to 30% by soaking them in GA 3 (100 or 300 mg·l -1 ) or ethephon (100 mg·l -1 ) or tap water. After 3 weeks Treatments of chilling beechnuts treated with GA 3 or ethephon germinated ca 20% better than beechnuts imbibed with tap water.…”

Section: Discussioncontrasting

confidence: 64%

“…200 mg·l -1 on intact beechnuts or 35 mg·l -1 on beechnuts without pericarp Muller 1976 ex Suszka 1990;Nicolás et al 1996;Mortensen and Eriksen 2004). Fernandez et al (1997) found no difference in the germination of pre-chilled, intact beechnuts treated either with 100 or 300 mg·l -1 GA 3 while dormant seeds germinated better when treated with 300 or 1,000 mg·l -1 GA 3 compared to 10-100 mg·l -1 GA 3 . Evidently, a lower dose of GA 3 did not compensate for pre-chilling.…”

Section: Discussionmentioning

confidence: 76%

“…Evidently, a lower dose of GA 3 did not compensate for pre-chilling. In the case of ethephon the recommended concentrations are 100 mg·l -1 Fernandez et al 1997;Muller and Larope 2003) or 144 mg·l -1 (Mortensen and Eriksen 2004). The effect of higher concentrations of ethephon on beechnut germination is not known.…”

Section: Discussionmentioning

confidence: 99%

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Effect of gibberellic acid and ethephon on the germination of European beech dormant and chilled beechnuts

Kolářová¹,

Bezděčková²,

Procházková³

2010

J. For. Sci.

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ABstrAct:The effect of ethephon (80, 100 and 120 mg·l -1 ) and gibberellic acid (GA 3 ) (40, 300 and 1,000 mg·l -1 ) on the germination capacity (GC) and mean germination time (MGT) of European beech (Fagus sylvatica [L.]) dormant beechnuts or beechnuts pre-chilled for four weeks was determined. Compared to the control (dormant untreated seeds) or beechnuts treated with tap water no significant increase in mean GC was detected after the application of ethephon or GA 3 to dormant seeds. Conversely, both ethephon and GA 3 treatments reduced (ethephon significantly) GC when applied to beechnuts chilled for four weeks prior to treatment. The effect of the treatments on germination speed (MGT) and dormancy release significantly improved when beechnuts were chilled for four weeks prior to the application of ethephon or GA 3 . However, the effect of GA 3 on MGT of chilled beechnuts was not so distinct compared to dormant untreated seeds. Reduction in MGT was most obvious in seeds hydrated with 1,000 mg·l -1 GA 3 prior to germination.Their cold requirement time was reduced by three weeks compared to beechnuts hydrated in tap water.

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Section: Discussioncontrasting

confidence: 64%

Section: Discussionmentioning

confidence: 76%

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Effect of gibberellic acid and ethephon on the germination of European beech dormant and chilled beechnuts

Kolářová¹,

Bezděčková²,

Procházková³

2010

J. For. Sci.

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“…where: t i -number of days from the beginning of the germination test, n i -percentage of germinating beechnuts on day t i (Fernandéz et al 1997). The day of achieving a defined germination percentage.…”

mentioning

confidence: 99%

The quality and the depth of dormancy of beechnuts in individual stand groups with varying climatic conditions within a single unit of approval

Bezděčková¹,

Matějka²

2015

J. For. Sci.

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ABSTRACT:The goal of this study was to analyse the quality and dormancy of beechnuts originating from different harvesting sites within large UA and to determine the homogeneity of seed lots from large-scale areas. Currently, European beech (Fagus sylvatica L.) accounts for 7.21% of the forested area of this country. Almost 24,000 ha of beech are registered as units of approval (UA) for harvesting of reproductive material. About 40% of these UA are made up of areas of 10 ha consisting of stands with different micro-sites. Beechnut dormancy and thus the chilling requirements for the rate of germination are affected by provenance and weather conditions (precipitation and temperature) during seed maturation. Beechnuts collected from different harvest sites reached significantly different germination and also showed different degrees of dormancy. Results illustrated that beechnut seed lots collected from large areas (a set of different stands) can show high heterogeneity in germination and dormancy and this can significantly affect the uniformity of pre-sowing treatment and emergence in nurseries.

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“…Germination rate was determined by calculating mean germination time (MGT) according to the formula: MGT = ∑ (t i .n i )/( ∑n i ) where t i is the number of weeks from the beginning of the germination test, and n i is the percentage of germinating beechnuts on week t i (Fernandéz et al 1997). A tetrazolium test, (ČSN 48 1211 2006) was used to determine the viability of four replicates of 100 beechnuts each from each seed lot.…”

Section: Moisture Content Germination and Viability Determinationmentioning

confidence: 99%

Practical implications of inconsistent germination and viability results in testing stored Fagus sylvatica seeds

Bezděčková¹,

Procházková²,

Matějka³

2013

Dendrobiology

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Germination and viability of stored European beech (Fagus sylvatica) seeds can vary depending upon the time when the tests are done during seed storage. To determine the possible sources of such variation the germination (GERM), germination rate expressed as mean germination time (MGT) and viability (VIAB) of six beechnut lots (three lots from two crop years) were determined monthly for one year using controlled laboratory conditions and standard tests. Higher GERM of some lots occurred when tests for stored seeds were carried out in spring and early autumn while other lots germinated better during summer tests. Similarly, different germination speed (dormancy release) and VIAB were observed in different months for different lots. However, no consistent seasonal fluctuation in GERM, MGT or VIAB of the beechnuts was observed in the tests. The reason for this fluctuation seems to be initial quality (germination and dormancy) of beechnut lots rather than any endogenous factors.

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Endogenous Gibberellins and Dormancy in Beechnuts

Cited by 7 publications

References 13 publications

Effect of gibberellic acid and ethephon on the germination of European beech dormant and chilled beechnuts

Effect of gibberellic acid and ethephon on the germination of European beech dormant and chilled beechnuts

The quality and the depth of dormancy of beechnuts in individual stand groups with varying climatic conditions within a single unit of approval

Practical implications of inconsistent germination and viability results in testing stored Fagus sylvatica seeds

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