Germinação e vigor de sementes de pau d’alho sob estresse salino

Lopes, José Carlos; Freitas, Allan Rocha de; Beltrame, Rômulo André; Venâncio, Luan Peroni; Manhone, Pedro Ramon; Silva, Fernanda Rodrigues Nunes e

doi:10.4336/2015.pfb.35.82.631

Cited by 6 publications

(7 citation statements)

References 11 publications

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“…Potassium nitrate has been studied in various agricultural crops to understand its mechanisms of action in species such as melon (ANDRADE JÚNIOR et al, 2011), "pau-d"dalho" (LOPES et al, 2015), and cabbage (KAISER et al, 2016), cultivated under saline conditions. However, studies related to potassium nitrate and water deficiency in cowpea remain scarce.…”

Section: Introductionmentioning

confidence: 99%

Genotypic Variation on the Antioxidative Response of Cowpeacultivars Exposed to Osmotic Stress

et al. 2017

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-The cowpea [Vigna unguiculata (L.) Walp.], also known as cowpea, is of fundamental socioeconomic importance to the northeast of Brazil, and has become one of the main sources of protein in the diet of the rural population. However, in this region, it has become necessary to identify genotypes that are better adapted to drought. In addition, research is needed regarding the action of substances that promote tolerance to stress factors. The aim of this study was to evaluate the antioxidative response of cowpea cultivars under osmotic stress conditions using potassium nitrate as an attenuator. Five osmotic potentials were tested in the substrate (0.0, −0.2, −0.4, −0.6, and −0.8 MPa), and three seed treatments (pre-soaking in distilled water, pre-soaking in potassium nitrate, and without pre-soaking) were tested in three cowpea cultivars (BRS Itaim, BRS Aracê, and BRS Potengi). The design was randomized with 45 treatments and four replications. The data were submitted to analysis of variance (P < 0.05), and in cases of significance, regression analysis was conducted to quantitate the factors. Our results indicate that an increase in proline content in cowpea plants may be seen as indicative of the intensity of water stress on germination and the initial stages of growth of the plant. The BRS Itaim cultivar best tolerates drought conditions with the application of potassium nitrate, given the increased activity of antioxidant enzymes such as superoxide dismutase, catalase, and ascorbate peroxidase.Keywords: Vigna unguiculata. Enzymes. Catalase. Hydrical stress. VARIAÇÃO GENOTÍPICA NA RESPOSTA ANTIOXIDATIVA DE CULTIVARES DE FEIJÃO-CAUPI EXPOSTOS AO ESTRESSE OSMÓTICORESUMO -O feijão-caupi [Vigna unguiculata (L.) Walp.], também conhecido como feijão macassar, representa fundamental importância socioeconômica para o Nordeste do Brasil, constituindo-se como uma das principais fontes proteicas na alimentação da população rural. Todavia, nessa região é necessário identificar genótipos mais adaptados ao déficit hídrico, bem como conhecer a ação de substâncias promotoras de tolerância a fatores de estresse. O objetivo desse trabalho foi avaliar a resposta antioxidativa de cultivares feijão-caupi sob condições de estresse osmótico, utilizando como atenuador o nitrato de potássio. Foram testados cinco potenciais osmóticos no substrato (0,0; -0,2; -0,4; -0,6 e -0,8 MPa) e três tratamentos de sementes (pré-embebição em água destilada; pré-embebição em nitrato de potássio e sem pré-embebição) em três cultivares (BRS Itaim, BRS Aracê e BRS Potengi). Foi adotado o delineamento inteiramente casualizado, com quatro repetições e sementes por repetição. Os dados obtidos foram submetidos à análise de variância (P<0,05) e nos casos de significância foi realizada a análise de regressão para fator de natureza quantitativa. Os resultados indicam que um aumento no teor de prolina em feijão-caupi pode ser visto como indicativo da intensidade do estresse hídrico na germinação e nos estágios iniciais de crescimento da planta. A cultiv...

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Section: Introductionmentioning

confidence: 99%

Genotypic Variation on the Antioxidative Response of Cowpeacultivars Exposed to Osmotic Stress

et al. 2017

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“…In addition, it is necessary to emphasize its toxic effect, resulting from the concentration of ions in the protoplasm. As the saline concentration increases in the soil solution, there is an increase in the osmotic pressure, and therefore the plant does not absorb the soil water, causing physiological and morphological disturbances that hinder the plant's survival in this stress condition [29].…”

Section: Resultsmentioning

confidence: 99%

“…Conditioning with potassium nitrate (KNO 3 ) has influenced the reversal of harmful changes in cell membranes caused by inactivation of enzymes and inhibition of protein synthesis [29]. This shows that even under stress conditions of abiotic origin, L. leucocephala seeds had positive effects on the physiological responses involved in the whole germination process, regulating germination percentage and germination rate, as well as the growth, development and establishment of seedlings.…”

Section: Resultsmentioning

confidence: 99%

Physiological Quality in Leucaena leucocephala Seeds Conditioned with Potassium Nitrate Submitted to Saline and Water Stresses

Silva

Demartelaere

et al. 2019

JEAI

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Leucaena leucocephala is a species that occurs in semi-arid regions capable of developing physiological and biochemical strategies under adverse environmental situations, such as saline soils and water deficiency. Even so, there are still losses in germination and initial development of plants, mainly due to abiotic stress effects, making it necessary to implement alternatives which are able to diminish the impact on the seeds with the use of potassium nitrate. The objective of this work was to evaluate the physiological quality in L. leucocephala seeds conditioned in potassium nitrate solution and subjected to saline and water stresses. After scarification, the unconditioned leucine seeds were separated and identified, and the conditioners were immersed in the 1.0 Mmol/L solution of potassium nitrate for 24 hours. The treatments were NaCl: 0; 30; 60; 90; 120 and 150 Mmol/L and the water potential: 0, 0; -0.2; -0.4; -0.6, and -0.8 MPa. The seeds were distributed over two Germitest® sheets, moistened with distilled water 2.5 times the dry weight and incubated in a B.O.D. at 25°C for 10 days. Then, the germination speed index, seedling length and seedling mass were measured for the normal seedlings. Eleven treatments with four replicates of 50 seeds were used. The design was completely randomized, and the statistical analyzes were performed in SAS. The use of potassium nitrate (KNO3) contributed to maintaining the physiological quality of L. leucochephala seeds under conditions of saline stress and water restriction.

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“…Brenan (angico), Santos et al (2016) observaram queda nos valores médios de germinação e IVG das duas espécies quando submetidas aos potenciais osmóticos mais negativos. Comportamento semelhante também foi notado por Lopes et al (2015) estudando os efeitos da salinidade na germinação de Gallesia integrifolia (Spreng.) Harms (pau d'alho).…”

Section: Discussionunclassified

Efeito da salinidade na germinação e crescimento inicial de plântulas de três espécies arbóreas florestais

et al. 2017

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O objetivo do presente trabalho foi avaliar o efeito do estresse salino na germinação e crescimento inicial de canafístula (Peltophorum dubium (Sprengel) Taubert), tamboril (Enterolobium contortisiliquum (Vell.) Morong.) e pau-formiga (Triplaris americana L.), além de determinar a máxima tolerância das três espécies arbóreas florestais à presença de NaCl na solução de embebição. Foi adotado delineamento experimental inteiramente casualizado, com quatro repetições de 50 sementes, no esquema fatorial 3 x 5, sendo estudada a resposta das três espécies a cinco níveis de potencial osmótico (0; -0,3; -0,6; -1,2 e -1,8 MPa), por simulação de estresse salino com NaCl. Aos 28 dias após semeadura foram avaliados: percentagem de germinação; índice de velocidade de germinação (IVG); tempo médio de germinação; comprimento da maior raiz; massa seca da parte aérea, raízes e total. A germinação e o crescimento inicial de plântulas de tamboril e canafístula foram afetados negativamente pelo aumento da concentração salina do meio. Pau-formiga mostrou-se mais tolerante ao estresse salino, apresentando elevação dos valores médios de percentagem de germinação, IVG, comprimento da maior raiz e produção de massa seca total em potenciais osmóticos variando de -0,81 a -1,15 Mpa. Os maiores valores médios de produção de massa seca da parte aérea, raízes e total foram observados em plântulas de tamboril.

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Germinação e vigor de sementes de pau d’alho sob estresse salino

Cited by 6 publications

References 11 publications

Genotypic Variation on the Antioxidative Response of Cowpeacultivars Exposed to Osmotic Stress

Genotypic Variation on the Antioxidative Response of Cowpeacultivars Exposed to Osmotic Stress

Physiological Quality in Leucaena leucocephala Seeds Conditioned with Potassium Nitrate Submitted to Saline and Water Stresses

Efeito da salinidade na germinação e crescimento inicial de plântulas de três espécies arbóreas florestais

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