Influence of current and future climate on the seed germination of Cenostigma microphyllum (Mart. ex G. Don) E. Gagnon & G. P. Lewis

Autor:	Marcelo do Nascimento Araujo, Samara Elizabeth Vieira Gomes, Bárbara França Dantas, Gilmara Moreira de Oliveira, Charlotte E. Seal
Přispěvatelé:	SAMARA ELIZABETH VIEIRA GOMES, GILMARA MOREIRA DE OLIVEIRA, MARCELO DO NASCIMENTO ARAUJO, CHARLOTTE E. SEAL, BARBARA FRANCA DANTAS, CPATSA.
Rok vydání:	2019
Předmět:	0106 biological sciences Tropical and subtropical dry broadleaf forests Estresse por sal Germinação Paleontology Tropics Climate change Plant Science Temperatura Biology Semente biology.organism_classification 010603 evolutionary biology 01 natural sciences Mudança Climática Caatinga Plant ecology Salinity Agronomy Germination Seedling Cenostigma microphyllum Dormancy 010606 plant biology & botany
Zdroj:	Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA-Alice) Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA
ISSN:	1874-9348 1211-9520
Popis:	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. Made available in DSpace on 2020-02-10T18:09:11Z (GMT). No. of bitstreams: 1 Influenceofcurrentandfutureclimate2019.pdf: 561195 bytes, checksum: 4f0fe59113afd021b7841cf4421f61a7 (MD5) Previous issue date: 2019
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c82c4c83d07216b092eb7ca3f7c4642f https://doi.org/10.1007/s12224-019-09353-4 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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