Influence of heat on seed germination of nine woody Cistaceae species

Herranz, José Marı́a; Ferrandis, Pablo; Martínez-Sánchez, J.J.

doi:10.1071/wf00014

Cited by 77 publications

(70 citation statements)

References 20 publications

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“…Keeley 1991;Tarrega et al 1992;Herranz et al 1998). However, our study showed that after the exposure to high temperatures, seeds still germinated.…”

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confidence: 38%

To resist or to germinate? The effect of fire on legume seeds in Brazilian subtropical grasslands

2016

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Fire plays an important role in several grassland ecosystems in the world. Fire can trigger germination in several species, by breaking the physical dormancy of their seeds. Thus, we hypothesized that exposure to high temperatures during fire would break seed dormancy and enhance germination. We tested the effect of high temperatures on the germination of six species of legumes from Brazilian subtropical grasslands. We used heat shock experiments with the following treatments: 60, 90, 120 and 150ºC for one minute. Seeds were then placed to germinate for 60 days in 12/12 hours light/dark and 20/30ºC. Germination was generally low for all study species. Most species was not affected by heat shock treatments. However, Stylosanthes montevidensis was the only species that had its physical dormancy broken when exposed to 120ºC. The seeds of all the other species were neither stimulated nor killed by high temperatures. Although the exposure to high temperatures did not affect the germination of the study species (except for one), it also did not kill seeds, thereby showing that seeds are resistant to fire. Therefore, the rapid passage of fire in these grasslands is not sufficient to break the dormancy of most of the studied species of legumes.

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“…Keeley 1991;Tarrega et al 1992;Herranz et al 1998). However, our study showed that after the exposure to high temperatures, seeds still germinated.…”

contrasting

confidence: 38%

To resist or to germinate? The effect of fire on legume seeds in Brazilian subtropical grasslands

2016

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“…and Pinus spp., is stimulated by increased heat [31]. However, their germination does not depend exclusively on the thermal increase caused by fire [21,42], as they also germinate under control conditions. The viability of seeds and the survival of seedlings in natural conditions are key factors for sexual regeneration of woody species [3].…”

Section: Discussionmentioning

confidence: 99%

Predicting the probability of seed germination in Pinus sylvestris L. and four competitor shrub species after fire

2003

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-Knowledge of the regeneration of competing shrub species after wildfire in Scots pine stands is essential for the regeneration of this tree species. The germination capability of seeds is modified by the temperature reached during a fire and the length of time that seeds are subjected to high temperatures. The probability of germination was studied in the laboratory for Scots pine (Pinus sylvestris) and four shrub species characteristic of the understory in Scots pine stands in northern Spain (Cistus laurifolius, Halimium umbellatum, Halimium alyssoides and Genista florida). Germination probability was studied with a logistic model that uses duration of exposure to the fire, the temperature and the interaction of both as independent variables. Results show a higher germination rate in shrub species at high temperature than for Scots pine. Thus by limiting competition between Scots pine and understory species, using prescribed burning or mechanical site preparation, Scots pine can regenerate successfully and quickly. This model can aid management decisions in this area.germination / scots pine / shrub species / thermal shock Résumé -Prédiction des probabilités de germination après le feu de Pinus sylvestris L. et de quatre espèces de garrigue. La régénération des espèces de garrigue après le feu est un facteur déterminant pour la réinstallation de Pinus sylvestris. La température pendant l'incendie et la durée de l'exposition modifient la capacité de germination des graines. Nous avons étudié au laboratoire la germination de Pinus sylvestris et de quatre espèces de garrigue (Cistus laurifolius, Halimium umbellatum, Halimium alyssoides et Genista Florida) qui sont typiques des forêts dominées par Pinus sylvestris. Afin de définir les probabilités de germination, on a utilisé la durée de l'exposition, la température et son interaction comme variables indépendantes, dans un modèle logistique. Les résultés de la germination suggèrent que les graines des espèces de garrigue présentent une meilleure germination après exposition à des hautes températures que les graines de Pinus sylvestris. En conséquence, les feux prescrits ou les entretiens mécaniques peuvent provoquer une régénération plus rapide et plus satisfaisante de Pinus sylvestris. dynamique de germination / Pinus sylvestris / espèces du maquis / feu de forêt

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“…Seed germination is influenced by internal factors causing dormancy including seed coat factors, embryo factors or inhibitors (Agrawal, Dadlani 1995). There are different methods to overcome dormancy, which vary from species to species, such as heating (Herranz et al 1998), stratification, scarification (Narbona et al 2003) and gibberellin application. Stratification and GA 3 treatments of seeds were effective to .…”

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confidence: 99%

Seed treatment with GA<sub>3</sub> or stratification enhances emergence of some strawberry tree genotypes: Short communication

Demirsoy¹,

Demirsoy²,

Celikel³

et al. 2010

Hort. Sci. (Prague)

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Demirsoy L., Demirsoy H., Celikel G., Macit I., Ersoy B., 2010: Seed treatment with GA 3 or stratification enhances emergence of some strawberry tree genotypes -Short communication. Hort. Sci. (Prague), 37: 34-37.The strawberry tree is a valuable ornamental plant because of its attractive red fruits in the fall and winter, and pinkish-white flowers in fall. Additionally, its fruits are processed into various products such as jam, marmalade, wine and alcohol. Since, propagation of the strawberry tree is difficult. This study aimed to examine the influence of stratification and GA 3 on breaking seed dormancy and enhancing emergence rate of Arbutus unedo. The influence of seed treatment with GA 3 or stratification at 4°C was examined on emergence of five genotypes of strawberry tree (Arbutus unedo L.) near the Black Sea in Turkey. Results indicate that emergence rate increased with increasing GA 3 concentration from 300 to 1,200 ppm and stratification duration from 5 to 15 weeks. In all examined genotypes, the highest emergence rate was obtained using 1,200 ppm GA 3 or 15 weeks of stratification. Regardless of the positive effects of the above treatments, seed emergence rates in all genotypes examined in this study were low. Application of GA 3 or stratification of seeds increased emergence percentage in all Arbutus unedo genotypes examined in the current study.

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Influence of heat on seed germination of nine woody Cistaceae species

Cited by 77 publications

References 20 publications

To resist or to germinate? The effect of fire on legume seeds in Brazilian subtropical grasslands

To resist or to germinate? The effect of fire on legume seeds in Brazilian subtropical grasslands

Predicting the probability of seed germination in Pinus sylvestris L. and four competitor shrub species after fire

Seed treatment with GA<sub>3</sub> or stratification enhances emergence of some strawberry tree genotypes: Short communication

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