Efeito do estresse hídrico na germinação e crescimento inicial de três espécies de leguminosas

Santarém, Eliane Romanato; Almeida-Cortez, Jarcilene S.; Silveira, Tania Sales da; Ferreira, Alfredo Guí

doi:10.1590/s0102-33061996000200002

Cited by 11 publications

(11 citation statements)

References 14 publications

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“…According to Marcos-Filho (2005), it is necessary that the seeds reach an adequate level of hydration during the imbibition phase, to occur reactivation of seed metabolic processes and growth of embryonic axis. Seeds subjected to severe drought stress require more time to adjust the internal osmotic potential in accordance with the external environment (Santarém et al, 1996). Meneses et al (2011) reported that highly negative osmotic potential may affect the seeds water uptake, making germination not possible.…”

Section: Effect Of Drought Stress On Seed Germination Processmentioning

confidence: 99%

Drought Stresses on Seed Germination and Early Growth of Maize and Sorghum

Queiroz¹,

Oliveira²,

Steiner³

et al. 2019

JAS

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Seeds of maize (Zea mays L.) and sorghum [Sorghum bicolor (L.) Moench.] were submitted to different osmotic potential levels induced by polyethylene glycol (PEG) with the objective of evaluating the effects of drought stress on seed germination and early seedling growth. Seeds were arranged in paper rolls and soaked in PEG solutions prepared with osmotic potentials 0.0 (control), -0.2, -0.4, and -0.8 MPa and kept into a seed germinator, at 25 °C for 18 days. A completely randomized design in a 2 × 4 factorial scheme with four replications of 50 seeds each was used. The results showed that by increasing of the osmotic potential level, germinated seed number, germination rate index, root and shoot length, shoot and root dry matter, and seedling vigor index (SVI) decreased, while mean germination time (MGT) and root: shoot ratio (RSR) increased in both crops. Additionally, the maize was more susceptible than sorghum to drought stress, with germination response declining more rapidly with decreasing osmotic potential. Sorghum crop tolerates water stress of up to -0.2 MPa, without reducing germination of the seeds; however, the growth of shoots and roots are inhibited. Drought stress limits the process of seed germination and early growth of maize seedlings.

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Section: Effect Of Drought Stress On Seed Germination Processmentioning

confidence: 99%

Drought Stresses on Seed Germination and Early Growth of Maize and Sorghum

Queiroz¹,

Oliveira²,

Steiner³

et al. 2019

JAS

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“…According to Bewley et al (2013), it is necessary that the seeds reach an adequate level of hydration during the imbibition phase, to occur reactivation of seed metabolic processes and growth of embryonic axis. Seeds subjected to severe drought stress require more time to adjust the internal osmotic potential in accordance with the external environment (Santarém et al, 1996). Meneses et al (2011) reported that highly negative osmotic potential may affect the water uptake of seeds, making germination not possible.…”

Section: Effect Of Drought Stress On Seed Germination Processmentioning

confidence: 99%

Drought tolerance of wheat and black oat crops at early stages of seedling growth

Steiner

Zuffo

Zóz

et al. 2017

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A B S T R A C TSeeds of wheat (Triticum aestivum L., cv. Jadeíte 11) and black oat (Avena strigosa Schreb., cv. Agro Planalto) were submitted to different osmotic potential levels induced by polyethylene glycol (PEG) with the objective of evaluate the effects of drought stress on seed germination and early seedling growth. Seeds were arranged in paper rolls and soaked in PEG solutions prepared with osmotic potentials from 0.0 (control), -0.2, -0.4, and -0.8 MPa and kept into a seed germinator, at 25°C for 15 days. A completely randomized design in a 2 × 4 factorial scheme with four replications of 50 seeds each was used. The results showed that by increasing of the osmotic potential level, germinated seeds number, germination rate index, root and shoot length, shoot and root dry matter, and seedling vigor index decreased, while mean germination time (MGT) and root:shoot ratio (RSR) increased in both crops. Additionally, black oat is more susceptible than wheat to drought stress, with germination response declining more rapidly with decreasing osmotic potential. Wheat crop tolerates water stress of up to -0.8 MPa, without reducing germination of the seeds; however, the growth of shoots and roots is drastically inhibited by the highly negative osmotic potential. The initial growth of black oat crop is progressively reduced with the rise of osmotic potential levels.Keywords: Avena strigosa Schreb., Triticum aestivum L., osmotic potential, PEG, water stress. R E S U M OSementes de aveia -preta (Avena strigosa Schreb., cv. Agro Planalto) e trigo (Triticum aestivum L., cv. Jadeíte 11) foram submetidas a diferentes potenciais osmóticos simulados com polietileno glicol (PEG 6000) com o objetivo de avaliar os efeitos do stress hídrico na germinação e no crescimento inicial das plântulas. As sementes foram dispostas em rolos de papel Germitest ® , devidamente umedecidos com soluções de PEG preparadas com potenciais osmótico de 0,0 (controle); -0,2; -0,4; e -0,8 MPa e mantidos em germinador, a 25°C durante 15 dias. O delineamento utilizado foi o inteiramente casualizado, em esquema fatorial 2 × 4, com quatro repetições de 50 sementes. Os resultados evidenciaram que o aumento do nível de potencial osmótico resultou na redução da porcentagem de germinação, índice de velocidade de germinação, comprimento e matéria seca da parte aérea e das raízes e do índice de vigor das plântulas, enquanto que o tempo médio de germinação e a relação entre a matéria seca das raízes: parte áerea aumentou em ambas as culturas. A cultura da aveia--preta é mais suscetível que o trigo ao déficit hídrico, com resposta de germinação declinando mais rapidamente com a redução do potencial osmótico. A cultura do trigo pode tolerar até -0,8 Mpa de déficit hídrico, sem reduzir a germinação das sementes; no entanto, o crescimento da parte aérea e das raízes é drasticamente reduzido pelo potencial osmótico altamente negativo. O crescimento inicial das plântulas de aveia -preta é progressivamente reduzido com o aumento dos níveis de potencial osmótico. Pala...

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“…No eucalipto, os sintomas da deficiência hídrica são mais visíveis e drásticos na fase de muda (Santarém et al, 1996;Jeller & Perez, 2001;Silva et al, 2004). Dessa forma, o conhecimento das relações entre deficiência hídrica, crescimento e desenvolvimento nas espécies de Eucalyptus sp.…”

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