Estresses hídrico e salino no processo germinativo das sementes de Plantago ovata Forsk. (Plantaginaceae)

Sousa, M. P.; Braga, Lúcia Filgueiras; Delachiave, María Elena Aparecida

doi:10.1590/s0100-67622008000100005

Cited by 8 publications

(5 citation statements)

References 13 publications

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“…Moraes, Menezes and Pasqualli (2005) evaluated osmotic potentials on common bean (Phaseolus vulgaris L.) seeds and found reduced germination (p<0.05) from -0.2 MPa, with no normal seedling formation from -0.25 MPa. Souza et al (2008) evaluated water stress induced by PEG-6000 in Plantago ovata seeds and found reduced germination and GSI from -0.2 MPa, which were totally inhibited at osmotic potentials of -0.6 and -0.8 MPa. The use of mannitol showed a linear decrease in germination and GSI as a function of the osmotic potentials evaluated (Figure 1).…”

Section: Resultsmentioning

confidence: 99%

WATER AND SALT STRESSES ON GERMINATION OF COWPEA ( Vigna unguiculata cv. BRS Tumucumaque) SEEDS

et al. 2017

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-The objective of this work was to evaluate seeds of cowpea, cultivar BRS Tumucumaque, subjected to different water stresses induced by polyethylene glycol (PEG-6000) and mannitol and different salt stresses induced by NaCl and CaCl 2 solutions. The water and salt stresses was evaluated in laboratory using completely randomized experimental designs in 2x6 factorial arrangements, with six osmotic potentials (0.0, -0.2, -0.4, -0.6, -0.8 and -1.0 MPa) and two stress inducers for each experiment, with four replications of 50 seeds. The percentage of germination, germination speed index, root and shoot lengths and seedling fresh weight were evaluated at the tenth day (end of the evaluation period). The simulated water stress showed effects on the cowpea seed germination and seedling initial growth by decreasing the rates of the variables evaluated, which had greater effect in treatments with PEG-6000. The salt stress induced by NaCl showed greater effect on the variables evaluated than that induced by CaCl 2 , due to the sodium toxicity in the salt chemical composition.Keywords: Germination speed index. Water deficit. Osmotic potential. ESTRESSE HÍDRICO E SALINO NA GERMINAÇÃO DE SEMENTES DE FEIJÃO-CAUPI (Vigna unguiculata cv. BRS Tumucumaque)RESUMO -O objetivo deste trabalho foi avaliar o comportamento de sementes das sementes da cultivar de feijão-caupi BRS Tumucumaque sob efeito de potenciais hídricos provocados por polietileno glicol (PEG 6000) e manitol e de potenciais salinos induzidos por soluções de NaCl e CaCl 2 . Para verificação dos estresses hídrico e salino, avaliou-se em laboratório, a combinação de seis potenciais osmóticos (0,0; -0,2; -0,4; -0,6; -0,8 e -1,0 MPa) com os dois agentes de estresses para cada experimento, em delineamento inteiramente casualizado, configurando esquema fatorial 2x6, com quatro repetições de 50 sementes. Foram avaliadas as variáveis: porcentagem de germinação, índice de velocidade de germinação (IVG), comprimento de raiz e parte aérea e massa fresca de plântulas no décimo dia, ao final do período de avaliação. A simulação de deficiência hídrica, utilizando-se manitol e PEG 6000 permitiu a constatação dos efeitos do estresse na germinação e no crescimento inicial das plântulas da cultivar BRS Tumucumaque, pelo decréscimo das variáveis observadas, sendo que os tratamentos à base de PEG 6000 foram os mais drásticos. A indução do estresse salino pelos sais NaCl e CaCl 2 foi verificada nas variáveis avaliadas, onde os efeitos do NaCl foram mais acentuados, devido a toxidade do sódio na composição química do sal.Palavras-chave: Índice de velocidade de germinação. Restrição hídrica. Potencial osmótico.

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Section: Resultsmentioning

confidence: 99%

WATER AND SALT STRESSES ON GERMINATION OF COWPEA ( Vigna unguiculata cv. BRS Tumucumaque) SEEDS

et al. 2017

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“…Lavezo et al (2015) worked with seeds of Petiveria alliacea L. and negative osmotic potentials of -0.4 and -0.5 MPa and found there was no germination when using CaCl 2 and NaCl agents, respectively. In addition, Sousa et al (2008) observed that the germination percentage of Plantago ovata seeds significantly decreased with potentials starting at -0.4 MPa of NaCl and CaCl 2 , and Rosa et al (2015) analyzed seeds of Salvia splendens and observed elevated indices of seed death and abnormal seedlings in the presence of NaCl and KCl. On the other hand, some studied have demonstrated that chia seeds tolerate certain levels of salinity, such as Dal' Maso et al (2013) (KCl).…”

Section: Degrees Of Freedommentioning

confidence: 99%

“…This inhibits the germination potential of cultures, as found in the following studies: Plantago ovata Forssk. (Sousa et al, 2008); Salvia aegyptiaca L. (Gorai et al, 2011); Prosopis juliflora (Sw.) DC. (Nasr et al, 2011); Ochroma pyramidale (Cav.…”

Section: Introductionmentioning

confidence: 99%

Germination of chia seeds submitted to saline stress

et al. 2020

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Abstract Salinity, of both soil and water, is one of the main causes of crop yield decline. Within this context, the objective of this study was to evaluate the influence of different salts on the germination of chia seeds. The experiment was conducted in a BOD chamber at a constant temperature of 20 °C and in the presence of light. The seeds were placed on paper soaked with aqueous solutions of calcium chloride (CaCl2), sodium chloride (NaCl), potassium chloride (KCl), and magnesium chloride (MgCl2), at the osmotic potentials zero, -0.10, -0.20, -0.30, and -0.40 MPa. The effect of the salinity was evaluated using a germination test, with counts on days 7 and 14 after sowing. Based on the results, chia seeds tolerate concentrations of NaCl to -0.4 MPa and KCl to -0.20 MPa. The salts CaCl2 and MgCl2 had a negative effect on the germination and vigor of the chia seeds for the osmotic potentials -0.30 MPa and -0.20 MPa, respectively.

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“…(Moura et al, 2011), in Plantago ovata Forsk. at potentials below -0.2 MPa (Sousa et al, 2008) and for Foeniculum vulgare Miller at osmotic potential of -0.1 MPa (Stefanello et al, 2006). These results indicate that each species has a maximum level of osmotic potential at which GSI is not affected.…”

Section: Sources Of Variation F Values Temperatures (T) Potentials (P)mentioning

confidence: 69%

Water stress and temperature on germination and vigor of Handroanthus impetiginosus (Mart. ex DC)

Santos

Benedito

Alves

et al. 2018

Rev. bras. eng. agríc. ambient.

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Water availability and temperature are among the main abiotic factors that influence seed germination and vigor, since they act directly on biochemical and physiological processes, which result in the production of the primary root. The objective of this study was to verify the effects of stress on germination and vigor of H. impetiginosus (‘ipê-roxo’) seeds under different temperatures and osmotic agents. The experimental design was completely randomized, in a 6 x 2 factorial scheme (osmotic potentials x temperatures) with four replicates of 25 seeds for each osmotic agent. In order to simulate water stress, polyethylene glycol (PEG 6000) and mannitol solutions were used and distilled water was used as control. Osmotic potentials of 0, -0.2, -0.4, -0.6, -0.8 and -1.0 MPa were evaluated at temperatures of 25 and 30 °C, under 8 h photoperiod. The variables analyzed were: germination, germination speed index, shoot length, root length, and total dry matter of seedlings. Simulated water stress affected seed germination and seed vigor of H. impetiginosus at both temperatures and osmotic agents from -0.6 MPa.

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Estresses hídrico e salino no processo germinativo das sementes de Plantago ovata Forsk. (Plantaginaceae)

Cited by 8 publications

References 13 publications

WATER AND SALT STRESSES ON GERMINATION OF COWPEA ( Vigna unguiculata cv. BRS Tumucumaque) SEEDS

WATER AND SALT STRESSES ON GERMINATION OF COWPEA ( Vigna unguiculata cv. BRS Tumucumaque) SEEDS

Germination of chia seeds submitted to saline stress

Water stress and temperature on germination and vigor of Handroanthus impetiginosus (Mart. ex DC)

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