Germinação de sementes de Urochloa ruziziensis em função da disponibilidade hídrica do substrato e teor de água das sementes

Masetto, Tathiana Elisa; Ribeiro, Dágon Manoel; Rezende, Rodrigo Kelson Silva

doi:10.1590/s1983-40632013000400010

Cited by 11 publications

(9 citation statements)

References 11 publications

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“…Polyethylene glycol with molecular mass of 4,000 or more are non -penetrable and non -toxic osmotic substance which can be used to lower the water potential of the germination environmental and it has been used to simulate controlled drought stress in nutrient solution cultures (Meneses et al, 2011). Responses of growth and germination to drought stress have been recently reported, including studies of crops, common bean (Machado -Neto et al, 2006), soybean (Teixeira et al, 2008), sunflower (Ahmad et al, 2009), sorghum (Oliveira and Gomes -Filho 2009), maize (Khodarahmpour, 2011), cotton (Meneses et al, 2011) and congo grass (Masetto et al, 2013).…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…These results are in line with those obtained by Oliveira and Gomes (2009), who found that the values for first germination count showed a linear behaviour inversely proportional to the increase in NaCl concentration, and who reported a difference between forage sorghum genotypes under salt stress. In the absence of a negative water potential, seeds of Urochloa ruziziensis showed a first count of 30% normal seedlings, this value decreasing to 1% when exposed to -0.4 MPa (Masetto, Ribeiro, & Silva Rezende, 2013). In five varieties of forage sorghum, Coelho et al (2013) found no effect from salt levels up to 10 dS m -1 (-0.25 MPa) on the germinative power of the seeds, on the fourth day after planting.…”

Section: Resultsmentioning

confidence: 88%

Germination and vigour in genotypes of forage sorghum at different levels of water and salt stress

Nunes

Cruz

Pinheiro

et al. 2020

Semina: Ciênc. Agrár.

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Salinity and water deficiency are abiotic factors which have a strong impact on agricultural activities, especially in arid and semi-arid regions. The aim of this research was to analyse the tolerance of two genotypes of forage sorghum, EA 116 and BRS Ponta Negra, to different levels of water and salt stress during germination. The conditions of water and salt stress were simulated by moistening the substrate with a solution of mannitol and of sodium chloride (NaCl) respectively, with the water potential adjusted to 0 (distilled water), -0.1, -0.2, -0.3, -0.4, -0.5 and -0.6 MPa. The variables under analysis were germination percentage, first count, germination speed index, shoot and root length, seedling dry weight, electrolyte leakage and leaf Na+/K+ ratio. The experiment was conducted in a completely randomised design, and distributed in a 2 (genotypes) × 2 (stress condition) × 7 (osmotic potential) factorial scheme, with four replications. The EA 116 and BRS Ponta Negra genotypes show greater tolerance to water stress. The EA 116 cultivar maintained germination under water stress from 0 to -0.6 MPa and saline stress from 0 to -0.4 MPa.

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“…Osmotic effects compromise germination as they disturb the gradient on the seed's surface, thereby limiting water absorption and causing physiological dryness (PEREIRA et al, 2012;SOARES et al, 2015). Consequently, the expected plant populations or crop stands decrease (DELATORRE-HERRERA and PINTO, 2009;BAJJI et al, 2002;BU et al, 2015), and the formation of abnormal seedlings harms the initial establishment (LIMA et al, 2009;MASETTO et al, 2013), and compromises productive capacity. In general, salinity significantly impacts plant establishment and delays emergence (DEBEZ et al, 2004;FERRARI et al, 2013).…”

Section: Soil Sciencementioning

confidence: 99%

Physiological response of marandu grass seeds exposed to NPK fertilizer

et al. 2019

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To facilitate seeding process of forage species, a common practice is to mix seeds with fertilizers in monocropping and intercropping or in implementing integrated livestock production systems. However, in prolonged periods of contact, the fertilizer’s salinity and acidity negatively affect the seeds’ physiological quality. Therefore, this study intends to verify the effect of ten periods (0, 3, 6, 12, 24, 36, 48, 72, 96, and 120 hours) of exposure to granular NPK fertilizer 04-30-16 on the vigor and germination of Urochloa brizantha cv. Marandu seeds. The experiment was conducted in a completely randomized design with three replication. The fertilizer and seed mixture registered a negative effect on seed moisture content, electrical conductivity, emergence, emergence speed index, and seedling and radicle length as the period of exposure to the fertilizer increased from 3 to 120 hours.

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Germinação de sementes de Urochloa ruziziensis em função da disponibilidade hídrica do substrato e teor de água das sementes

Cited by 11 publications

References 11 publications

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

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

Germination and vigour in genotypes of forage sorghum at different levels of water and salt stress

Physiological response of marandu grass seeds exposed to NPK fertilizer

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