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Registro Completo |
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Biblioteca(s): |
Embrapa Semiárido. |
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Data corrente: |
17/10/2019 |
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Data da última atualização: |
10/02/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
GOMES, S. E. V.; OLIVEIRA, G. M. de; ARAÚJO, M. do N.; SEAL, C. E.; DANTAS, B. F. |
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Afiliação: |
SAMARA ELIZABETH VIEIRA GOMES; GILMARA MOREIRA DE OLIVEIRA; MARCELO DO NASCIMENTO ARAUJO; CHARLOTTE E. SEAL; BARBARA FRANCA DANTAS, CPATSA. |
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Título: |
Influence of current and future climate on the seed germination of Cenostigma microphyllum (Mart. ex G. Don) E. Gagnon & G. P. Lewis. |
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Ano de publicação: |
2019 |
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Fonte/Imprenta: |
Folia Geobotanica, v. 54, p. 19-28, 2019. |
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DOI: |
10.1007/s12224-019-09353-4 |
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Idioma: |
Inglês |
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Conteúdo: |
Seasonally tropical dry forests are among the most threatened environments by climate change. However, these forests, which are at risk of desertification, are still poorly studied and conserved. Seeds of several species endemic to the Caatinga, a Brazilian dry forest, are also understudied, mainly regarding their ability to cope with a hotter and drier climate predicted for the future. For the first time in seeds of Cenostigma microphyllum (Leguminosae), we aimed to study the presence of physical dormancy, temperature and salt tolerance to ascertain the effects of current and future climate on seed germination. Intact and scarified seeds were investigated by incubating at constant temperatures (15 to 40°C) or in NaCl solutions (?0.2 to ?1.0 MPa) at 25 and 30°C. Thermal and osmotic thresholds, as well as thermal time and hydrotime constants, were calculated using linear regressions between the germination conditions and germination rate. To predict germination in the future, a heat sum model based on thermal time and hydrotime was applied to current and future climate scenarios. Seeds of C. microphyllum were permeable to water and did not have physical dormancy. The results indicated that increases in temperature are unlikely to affect germination, despite greater sensitivity to salinity presented at higher temperatures. In a future climate, the reduction in the number of weeks with at least 15 mm rainfall will affect the germination timing for the seeds. Thus, we can conclude that under the most pessimistic climate scenario predicted for the future, the seed germination of C. microphyllum may be restricted, likely leading to low seedling recruitment and establishment. MenosSeasonally tropical dry forests are among the most threatened environments by climate change. However, these forests, which are at risk of desertification, are still poorly studied and conserved. Seeds of several species endemic to the Caatinga, a Brazilian dry forest, are also understudied, mainly regarding their ability to cope with a hotter and drier climate predicted for the future. For the first time in seeds of Cenostigma microphyllum (Leguminosae), we aimed to study the presence of physical dormancy, temperature and salt tolerance to ascertain the effects of current and future climate on seed germination. Intact and scarified seeds were investigated by incubating at constant temperatures (15 to 40°C) or in NaCl solutions (?0.2 to ?1.0 MPa) at 25 and 30°C. Thermal and osmotic thresholds, as well as thermal time and hydrotime constants, were calculated using linear regressions between the germination conditions and germination rate. To predict germination in the future, a heat sum model based on thermal time and hydrotime was applied to current and future climate scenarios. Seeds of C. microphyllum were permeable to water and did not have physical dormancy. The results indicated that increases in temperature are unlikely to affect germination, despite greater sensitivity to salinity presented at higher temperatures. In a future climate, the reduction in the number of weeks with at least 15 mm rainfall will affect the germination timing for the seeds. Thus, we can conclu... Mostrar Tudo |
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Palavras-Chave: |
Cenostigma microphyllum; Estresse por sal. |
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Thesagro: |
Caatinga; Germinação; Mudança Climática; Semente; Temperatura. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/210553/1/Influence-of-current-and-future-climate-2019.pdf
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Marc: |
LEADER 02512naa a2200265 a 4500
001 2113193
005 2020-02-10
008 2019 bl uuuu u00u1 u #d
024 7 $a10.1007/s12224-019-09353-4$2DOI
100 1 $aGOMES, S. E. V.
245 $aInfluence of current and future climate on the seed germination of Cenostigma microphyllum (Mart. ex G. Don) E. Gagnon & G. P. Lewis.$h[electronic resource]
260 $c2019
520 $aSeasonally tropical dry forests are among the most threatened environments by climate change. However, these forests, which are at risk of desertification, are still poorly studied and conserved. Seeds of several species endemic to the Caatinga, a Brazilian dry forest, are also understudied, mainly regarding their ability to cope with a hotter and drier climate predicted for the future. For the first time in seeds of Cenostigma microphyllum (Leguminosae), we aimed to study the presence of physical dormancy, temperature and salt tolerance to ascertain the effects of current and future climate on seed germination. Intact and scarified seeds were investigated by incubating at constant temperatures (15 to 40°C) or in NaCl solutions (?0.2 to ?1.0 MPa) at 25 and 30°C. Thermal and osmotic thresholds, as well as thermal time and hydrotime constants, were calculated using linear regressions between the germination conditions and germination rate. To predict germination in the future, a heat sum model based on thermal time and hydrotime was applied to current and future climate scenarios. Seeds of C. microphyllum were permeable to water and did not have physical dormancy. The results indicated that increases in temperature are unlikely to affect germination, despite greater sensitivity to salinity presented at higher temperatures. In a future climate, the reduction in the number of weeks with at least 15 mm rainfall will affect the germination timing for the seeds. Thus, we can conclude that under the most pessimistic climate scenario predicted for the future, the seed germination of C. microphyllum may be restricted, likely leading to low seedling recruitment and establishment.
650 $aCaatinga
650 $aGerminação
650 $aMudança Climática
650 $aSemente
650 $aTemperatura
653 $aCenostigma microphyllum
653 $aEstresse por sal
700 1 $aOLIVEIRA, G. M. de
700 1 $aARAÚJO, M. do N.
700 1 $aSEAL, C. E.
700 1 $aDANTAS, B. F.
773 $tFolia Geobotanica$gv. 54, p. 19-28, 2019.
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Embrapa Semiárido (CPATSA) |
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