Heat-shock and seed germination of a group of Mediterranean plant species growing in a burned area: An approach based on plant functional types

Luna, Belén; Moreno, José M.; Cruz, Alberto; Fernández‐González, Federico

doi:10.1016/j.envexpbot.2006.12.014

Cited by 74 publications

(58 citation statements)

References 63 publications

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“…Fire can stimulate or inhibit germination of the Ericaceae, depending on its duration and intensity (Mesléard & Lepart 1991). Heat treatments simulating wildfires enhance germination of many Mediterranean species (Obeso & Vera 1996, Cruz et al 2003, Díaz Vizcaíno et al 2006, Luna et al 2007. Temperature is the most important environmental factor involved in softening of the seed coat (Baskin & Baskin 1998), as it improves penetration of water into the seed, especially in cases of physical dormancy (Luna et al 2007).…”

Section: Discussionmentioning

confidence: 99%

“…Heat treatments simulating wildfires enhance germination of many Mediterranean species (Obeso & Vera 1996, Cruz et al 2003, Díaz Vizcaíno et al 2006, Luna et al 2007. Temperature is the most important environmental factor involved in softening of the seed coat (Baskin & Baskin 1998), as it improves penetration of water into the seed, especially in cases of physical dormancy (Luna et al 2007). Erica australis showed a clear increase in germination and a decrease in germination time when seeds were treated for 10 minutes at 80 or 110 °C.…”

Section: Discussionmentioning

confidence: 99%

“…In fire-prone ecosystems, conditions for seedling establishment are particularly favourable immediately after passage of fire, due to, among other factors, improved resource availability (Luna et al 2007). This is the case for Mediterranean-type environments where many plants produce seeds that are released from dormancy only after exposure to fire-related factors, such as heat (Bond & van Wilgen 1996, Valbuena & Vera 2002.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Chemical and Physical Treatments on Seed Germination ofErica australis

Vera

Parra

Oliva

2010

Annales Botanici Fennici

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We studied the germination of Erica australis seeds and their responses to different treatments (high temperature, acidic condition, cold stratification, gibberellic acid applications). Germination was very low in untreated seeds (3%) and required approximately one month to start, but increased in all the treatments tested, reaching a value of 100% when seeds were treated with gibberellic acid (25 ppm). Exposure to heat and to low pH promotes germination and reduces time to germinate, which indicates that germination is related to passage of fire and to soil pH. Germination of this species is also correlated with wet and cold conditions and dormancy can be classified as being of the physiological type.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Chemical and Physical Treatments on Seed Germination ofErica australis

Vera

Parra

Oliva

2010

Annales Botanici Fennici

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“…The effects of fire on the seeds include loss of viability (Schmidt et al 2005), dormancy break (Ribeiro et al 2013), and the activation of genes important to germination by the presence of smoke (Moreira et al 2010). These effects depend mainly on the degree of tolerance a seed and the species life history has to high temperatures (Luna et al 2007). The Cerrado is an environment in which fire has been a recurrent factor for thousands of years (Salgado-Laboriau et al 1997).…”

Section: Introductionmentioning

confidence: 99%

Key factors affecting seed germination of Copaifera langsdorffii, a Neotropical tree

et al. 2015

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In natural conditions biotic and abiotic factors interact, synergistically affecting seed germination. In this study, we experimentally simulated natural conditions that occur during seed dispersal that can affect the germination of Copaifera langsdorffii. Specifically we evaluated the effect of aril removal by different dispersal agents (birds and ants) and fire on germination. The seeds were submitted to the following treatments: Control (seeds placed to germinate with aril intact); Acid (simulation of passage through the digestive tract of a bird); Aril removal (simulation of aril removed by ants); Fire (seeds exposed to fire). Germination percentage and time varied among treatments (X²=89. 735, P<0.001; X²=16.225, P<0.001, respectively). None of the control seeds (intact aril) germinated. Treatments that simulated dispersal (Acid, Aril removal) did not differ in germination percentage, with about 50% of the seeds germinating, however, the acid treatment accelerated seed germination. Fire also had a positive effect on seed germination with about 80% of the seeds germinating. Our results demonstrate the importance of dispersal agents to the population dynamics of C. langsdorffii. Furthermore, the capacity of seeds of C. langsdorffii to tolerate high temperatures is an important attribute for the occurrence of this species in the Cerrado.

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“…Most studies addressing the effects of high temperatures on the germination of Fabaceae species found peak germination between 70 -100ºC (Martin et al 1975;Auld & O'Connel 1991;Williams et al 2003). Luna et al (2007) reported that maximum germination for Mediterranean plants was after the exposure to 80ºC, and that these temperatures can be reached by the soil during summer, being these species classified as having facultative pyrogenic dormancy, or as gap dependent (Ooi et al 2014).…”

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confidence: 99%

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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Heat-shock and seed germination of a group of Mediterranean plant species growing in a burned area: An approach based on plant functional types

Cited by 74 publications

References 63 publications

Effect of Chemical and Physical Treatments on Seed Germination ofErica australis

Effect of Chemical and Physical Treatments on Seed Germination ofErica australis

Key factors affecting seed germination of Copaifera langsdorffii, a Neotropical tree

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

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