Please use this identifier to cite or link to this item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1135758
Research center of Embrapa/Collection: Embrapa Semiárido - Artigo em periódico indexado (ALICE)
Date Issued: 2021
Type of Material: Artigo em periódico indexado (ALICE)
Authors: NASCIMENTO, J. P. B.
DANTAS, B. F.
MEIADO, M. V.
Additional Information: JOANA PAULA BISPO NASCIMENTO; BARBARA FRANCA DANTAS, CPATSA; MARCOS VINICIUS MEIADO.
Title: Hydropriming changes temperature thresholds for seed germination of tree species from the Caatinga, a Brazilian tropical dry forest.
Publisher: Journal of Seed Science, v. 43, e202143004, 2021.
Language: Ingles
Keywords: Tolerância
Estresse térmico
Modelagem
Planta da Caatinga
Especie arborea
Hidrocondicionamento
Description: This study evaluates the effects of hydration and dehydration cycles (HD cycles) on seed germination of four Caatinga tree species (Anadenanthera colubrina var. cebil, Enterolobium contortisiliquum, Pityrocarpa moniliformis and Pterogyne nitens) subjected to different temperatures and determine the thermal upper and lower limits of germination. For this, seeds were subjected to 0, 1, 2 and 3 HD cycles and set to germinate at temperatures of 5, 10, 15, 25, 35, 40 and 45 °C. Germinability and t50 were calculated and the differences of these parameters were compared by two-way ANOVA. In addition, germination rate (GR = 1/t50), as well as ceiling (Tc), optimum (To) and base (Tb) temperatures were calculated to estimate the limits below or above which the seeds fail to germinate. We observed that the more HD cycles, the better the seed responds, especially at extreme temperatures. Seeds of all studied species showed To between 25 and 35 °C, Tb < 10 °C, and Tc > 40 °C. The slope of regression curves for germination rate showed that submitting seeds to HD cycles expands its thermal tolerance range, revealing that this seed pre-treatment can be efficient for species as it increases their tolerance to thermal stress.
Thesagro: Semente
Caatinga
Temperatura
NAL Thesaurus: Dry forests
Anadenanthera colubrina
Pityrocarpa moniliformis
Data Created: 2021-11-03
Appears in Collections:Artigo em periódico indexado (CPATSA)

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