Rainfall events, high CO2 concentration and germination seeds of Caatinga

Silva, Fabrício Francisco Santos da; Oliveira, G. M. de; Aráujo, M. N.; Angelotti, Francislene; Moura, Magna Soelma Beserra de; Dantas, B. F.

doi:10.24221/jeap.2.3.2017.1453.258-265

Cited by 4 publications

(4 citation statements)

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“…Among the species studied in this work, M. urundeuva is most vulnerable to climate change, due to its lower T o and T c , as well as its slow seedling growth. In the soil seed bank, only 0.5% of M. urundeuva seeds germinated, while seeds of C. pyramidale achieved 15% germination, during a 6-month trial in which the total rainfall was 83 mm, distributed in small rainfall events (Silva et al 2017). These findings confirm the criticality of weekly rainfall below 17.5 mm as a barrier to the progress of germination.…”

Section: Germination Niche Under Projected Climate Changementioning

confidence: 99%

“…Small rainfall events have a major ecological role in semi-arid regions, in which events of 17.5 mm or less account for 90% of total annual rainfall events and have very large effects on ecosystem dynamics (Sala and Lauenroth 1982). This is also the case in the Caatinga, as rainfall events are stochastic, even during the rainy season (Moura et al 2015;Silva et al 2017).…”

Section: Current Germination Niche Requirementsmentioning

confidence: 99%

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Rainfall, not soil temperature, will limit the seed germination of dry forest species with climate change

et al. 2019

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Drylands are predicted to become more arid and saline due to increasing global temperature and drought. Although species from the Caatinga, a Brazilian tropical dry forest, are tolerant to these conditions, the capacity for germination to withstand extreme soil temperature and water deficit associated with climate change remains to be quantified. We aimed to evaluate how germination will be affected under future climate change scenarios of limited water and increased temperature. Seeds of three species were germinated at different temperatures and osmotic potentials. Thermal time and hydrotime model parameters were established and thresholds for germination calculated. Germination performance in 2055 was predicted, by combining temperature and osmotic/salt stress thresholds, considering soil temperature and moisture following rainfall events. The most pessimistic climate scenario predicts an increase of 3.9 °C in soil temperature and 30% decrease in rainfall. Under this scenario, soil temperature is never lower than the minimum and seldomly higher than maximum temperature thresholds for germination. As long as the soil moisture (0.139 cm 3 cm 3 ) requirements are met, germination can be achieved in 1 day.According to the base water potential and soil characteristics, the minimum weekly rainfall for germination is estimated to be 17.5 mm. Currently, the required minimum rainfall occurs in 14 weeks of the year but will be reduced to 4 weeks by 2055. This may not be sufficient for seedling recruitment of some species in the natural environment. Thus, in future climate scenarios, rainfall rather than temperature will be extremely limiting for seed germination.

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Section: Germination Niche Under Projected Climate Changementioning

confidence: 99%

Section: Current Germination Niche Requirementsmentioning

confidence: 99%

Rainfall, not soil temperature, will limit the seed germination of dry forest species with climate change

et al. 2019

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“…This trend can already be verified in the drought years of 2011 to 2017 (Marengo et al, 2016), as well as in the rainy season between 2016 and 2017, when the precipitation levels remained below 20 mm per week. In both cases, the emergence of seedlings of M. urundeuva from seed banks was compromised (Silva et al, 2017).…”

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Environmental stress, future climate, and germination of Myracrodruon urundeuva seeds 1

et al. 2019

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Myracrodruon urundeuva, a native species from the Brazilian Caatinga, is widely distributed across its endemic region, where it also plays an essential socioeconomic role. The objective of this study was to evaluate the influence of environmental stress on the germination of M. urundeuva seeds harvested in different years (2010 to 2013). Seeds were germinated at constant temperatures between 10 to 40 °C, osmotic potentials from 0 to -0.8 MPa (in polyethylene glycol 6000 solutions), and from 0 to -0.5 MPa (in NaCl solutions). The experiment was conducted according to a completely randomized design, with three replicates of 50 seeds, in a factorial scheme (harvest year x stress intensity) for each environmental stress. Germination data were then analysed using thermal, hydro and halo time models, and future germination responses projected according to climate change scenarios. The germination thermal thresholds ranged from 7.4 to 53.3 oC. The germination base osmotic threshold (using polyethylene glycol) was -0.6 MPa and the base osmotic threshold in NaCl was -0.43MPa. Seeds from different harvest years showed distinct tolerance to environmental stresses. The thermal, hydro and halo-time models were efficient to describe the germinative response of seeds, and the climate models allowed to identify the germination responses of M. urundeuva in future climate. According to the models for future climate (RCP 8.5), the reduction of rainfall by 2100 will directly affect seed germination and seedling recruitment of M. urundeuva.

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“…Listagem das 30 principais praças do município de Maricá, RJ, cadastradas com os respectivos endereços e coordenadas. Araújo et al (2017); e no bairro da Tijuca, Rio de Janeiro -RJ por Freitas; Pinheiro; Abrahão (2015).…”

Section: Materiais E Métodosunclassified

Resposta De Genótipos De Milho a Interação Com Bactérias Endofíticas De Nódulos De Leguminosas

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Santos³

et al. 2020

Avanços E Atualidades Na Botânica Brasileira

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RESUMOAs praças públicas servem como escape para as pessoas que desejam um pouco de natureza no seu dia a dia, pois é um ambiente que propicia elementos naturais aos cidadãos, trazendo harmonia e bem-estar, sendo uma área de lazer, tendo importância em aspectos ecológicos, sociais e políticos contribuindo na preservação da flora. Teve como objetivo realizar o levantamento de espécies vegetais nas praças públicas de Humaitá-AM. Foram visitados cinco bairros com cinco praças, sendo uma praça em cada bairro que são; Praça da Matriz, Praça da Saúde, Praça da Rodoviária, Praça Santo Antônio e Praça da Olaria. A identificação das espécies foi realizada por meio de levantamento de campo e confirmada com auxílio de identificadores botânicos e da literatura científica. As espécies mais encontradas foram da família Arecaceae; areca bambu com dezessete espécimes (Dypsis lutescens (H. Wendl.) Beentje & J.) e palmeira azul com dezessete espécimes (Bismarckia nobilis Hildebr. & H. Wendl.); da família Moraceae, figueira-benjamim com quarenta e oito espécimes (Ficus benjamina L.); da família Myrtaceae, jambo vermelho com quarenta espécimes (Syzygium malaccense (L.) Merr. & L.M. Perry); da família Chrysobalanaceae; oiti com quinze espécimes (Licania tomentosa (Benth.) Fritsch.); da família Rubiaceae, ixora compacta com onze espécimes (Ixora coccinea L.) e família Anacardiaceae, manguá com 13 espécimes (Mangifera indica L.). Portanto as praças são importantes para o lazer e bem-estar, pois serve para as pessoas perceberem que a natureza faz parte da vida humana e é essencial viver em equilíbrio com a mesma. Palavras-chaves: Espécies Vegetais, Equilíbrio e Myrtaceae.

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Rainfall events, high CO2 concentration and germination seeds of Caatinga

Cited by 4 publications

References 31 publications

Rainfall, not soil temperature, will limit the seed germination of dry forest species with climate change

Rainfall, not soil temperature, will limit the seed germination of dry forest species with climate change

Environmental stress, future climate, and germination of Myracrodruon urundeuva seeds 1

Resposta De Genótipos De Milho a Interação Com Bactérias Endofíticas De Nódulos De Leguminosas

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