Influência do 24-epibrassinolídeo na tolerância ao estresse salino em plântulas de arroz

Larré, Cristina Ferreira; Marini, Patrícia; Moraes, Caroline Leivas; Amarante, Luciano do; Moraes, Dário Munt de

doi:10.5433/1679-0359.2014v35n1p67

Cited by 14 publications

(12 citation statements)

References 11 publications

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“…When the plants were irrigated with 3.8 dS m -1 water, the data fitted to the regression model as K doses increased and, from the dose of 71% (0.699 mg g -1 FM), plants irrigated with water of highest electrical conductivity showed a sharp reduction in the chlorophyll b contents. According to Larré et al (2014), the enzyme chlorophyllase is stimulated in the first days of exposure to stress (moderate stress), but this activity is strongly inhibited by high salt concentration. Nevertheless, it can be inferred that K fertilization positively influences chlorophyll index, if adequate amount is provided, because besides increasing N assimilation and transport, K is responsible for the movement of the stomatal guard cells, regulating the entry of CO 2 , which serves as fuel for photosynthesis, as reported by Appezzato-da-Glória & Carmello-Guerreiro (2012 increased and, according to the regression equation ( Figure 4B), there was an increment of 7.56% for every 25% increase in K doses.…”

Section: Results and Discussonmentioning

confidence: 99%

Saline water and potassium fertilization in cultivation of grafted west indian cherry BRS 366 Jaburu

Pinheiro¹,

Lima²,

Gheyi³

et al. 2019

Biosci. J.

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Agricultural exploitation in the semi-arid region of Northeast Brazil depends on the use of irrigation to guarantee safe production of crops. Nevertheless, the waters commonly used in this region have high levels of salts and require management strategies that make their use possible in agriculture. In this context, the present study aimed to evaluate water relations, photosynthetic pigments and growth of grafted West Indian cherry as a function of saline water irrigation and potassium (K) fertilization. The study was conducted under greenhouse conditions in lysimeters filled with eutrophic Regolithic Neosol with sandy loam texture, in the municipality of Campina Grande-PB, Brazil. Treatments were distributed in randomized blocks and consisted of two factors: two levels of irrigation water electrical conductivity -ECw (0.8 and 3.8 dS m -1 ) and four K doses (50, 75; 100 and 125% of the recommendation), with three replicates and one plant per plot. The 100% dose corresponded to 19.8 g of K 2 O per plant per year. The West Indian cherry crop was sensitive to water salinity of 3.8 dS m -1 in the post-grafting phase, resulting in a decline in photosynthetic pigment content and growth. Increasing K doses reduced the percentage of cell membrane damage and promoted increase in the synthesis of chlorophyll a and carotenoids in West Indian cherry plants. There was significant interaction between salinity levels and K doses for the leaf osmotic potential, water saturation deficit, percentage of cell membrane damage and chlorophyll b content in West Indian cherry plants.

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Section: Results and Discussonmentioning

confidence: 99%

Saline water and potassium fertilization in cultivation of grafted west indian cherry BRS 366 Jaburu

Pinheiro¹,

Lima²,

Gheyi³

et al. 2019

Biosci. J.

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“…A reduction in dry mass can also reflect the metabolic cost of energy, associated with adaption to salinity and reductions in carbon gain (Richardson and McCree, 1985;Larré et al, 2014).…”

Section: Initial Developmentmentioning

confidence: 99%

Ryegrass (Lolium multiflorum Lam.) seed germination and vigor under saline stress

Radke¹,

Eberhardt²,

Martins³

et al. 2018

Aust J Crop Sci

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Ryegrass (Lolium multiflorum Lam.) is forage with the potential to increase pasture area in Southern Brazil. It is an option for more profitable and intensive use of floodplain areas during the cold seasons of the year. However, irrigation of crops in these areas in the summer can result in the salinization of the soils that have inadequate drainage, preventing the removal of salt by leaching. The objective of this study was to evaluate the performance of ryegrass seeds using different concentrations of sodium chloride. Four commercial ryegrass cultivars of PGG Wrightson Seeds Brazil were used: Inia Bakarat, Inia Scorpio, Inia Camaro, and La Estanzuela 284. Saline substrates consisted of Germitest® paper wetted with sodium chloride solution at five osmotic potentials (0, -0.2, -0.4, -0.6 and -0.8 MPa). The study was conducted at the "Flavio Rocha" Didactic Seeds Analysis Laboratory and involved analysis of the following indicators of salt stress response: germination (%), first germination count (%), plantlet length (cm), and plantlet dry phytomass (mg/seedling). The results showed that saline stress conditions caused by reduced osmotic potential affected ryegrass seed germination and vigor, as well as decreased the stature of the aerial and root parts of the seedlings. Out of the cultivars evaluated, La Estanzuela 284 was the most tolerant to saline stress. It is possible to cultivate ryegrass in areas with salinity up to mean values of -0.2 MPa osmotic potential. In this study, no significant decrease in seedling performance was observed.

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“…Similarly, for fresh shoot weight (p = 0.002) and free root weight (p = 0.01) and dry shoot weight (p = 0.02) and dry root weight (p = 0.005), plants cultivated using the highest Cu concentration showed 19, 46, 24, and 40%, respectively, of the values observed for the control plants. These results show that the strategy of plants under stress due to high metal concentrations is to use tolerance mechanisms, limiting other processes such as growth (POSMYK et al, 2009;LARRÉ et al, 2014). Furthermore, recent studies have shown a relationship between the biochemical phase of photosynthesis, which is highly sensitive to the effects of heavy metals, and the decrease in growth (SHI-SHENG, 2007).…”

Section: Resultsmentioning

confidence: 94%

Physiological responses of sweet potato (Ipomoea batatas L.) plants due to different copper concentrations

Cuchiara

Winhelmann

Larré

et al. 2015

SCA

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At low concentrations, Cu is considered as an essential micronutrient for plants and as a constituent and activator of several enzymes. However, when in excess, Cu can negatively affect plant growth and metabolism. Therefore, the aim of this study was to evaluate physiological responses of sweet potato plants at different Cu concentrations by measuring morphological parameters, antioxidant metabolism, stomatal characteristics, and mineral profile. For this purpose, sweet potato plants were grown hydroponically in complete nutrient solution for six days. Then, the plants were transferred to solutions containing different Cu concentrations, 0.041 (control), 0.082, and 0.164 mM, and maintained for nine days. The main effect of increased Cu concentration was observed in the roots. The sweet potato plants grown in 0.082 mM Cu solution showed increased activity of antioxidant enzymes and no changes in growth parameters. However, at a concentration of 0.164 mM, Cu was transported from the roots to the shoots. This concentration altered morpho-anatomical characteristics and activated the antioxidant system because of the stress generated by excess Cu. On the basis of the results, it can be concluded that the sweet potato plants were able to tolerate Cu toxicity until 0.082 mM. Key words: Micronutrient, antioxidant metabolism, mineral content, copper sulfate, stress ResumoO cobre, em baixas concentrações, é considerado micronutriente essencial para as plantas por ser constituinte e ativador de diversas enzimas. Porém, quando em excesso, pode afetar negativamente o crescimento, o desenvolvimento e o metabolismo vegetal. Com base no exposto, o objetivo do trabalho foi avaliar as respostas fisiológicas de plantas de batata-doce quando submetidas a diferentes concentrações de cobre através dos parâmetros morfológicos, índice de clorofila, metabolismo antioxidante, perfil mineral e características estomáticas. Para tanto, as mesmas foram cultivadas em sistema hidropônico com solução nutritiva completa por seis dias. Após este período foram transferidas para soluções contendo diferentes concentrações de cobre: 0,041 (controle); 0,082 e 0,164 mM, onde permaneceram por nove dias. Nas raízes, o principal efeito do aumento da concentração de cobre foi o acúmulo do mesmo nesse órgão. As plantas de batata-doce cultivadas com 0,082 mM de cobre na solução, apresentaram aumento da atividade das enzimas antioxidantes sem nenhuma alteração na taxa de crescimento. No entanto, na concentração de 0,164 mM, o cobre foi transportado das raízes para a parte aérea. Essa concentração reduziu o crescimento, alterou características morfo-anatômicas e ativou o sistema antioxidante como forma de proteção ao estresse gerado pelo excesso de cobre. Com base nos resultados, pode-se concluir que as plantas de batata-doce foram capazes de tolerar a toxidez por Cu até a concentração de 0,082 mM. Palavras-chave: Micronutriente, perfil mineral, sulfato de cobre, estresse

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Influência do 24-epibrassinolídeo na tolerância ao estresse salino em plântulas de arroz

Cited by 14 publications

References 11 publications

Saline water and potassium fertilization in cultivation of grafted west indian cherry BRS 366 Jaburu

Saline water and potassium fertilization in cultivation of grafted west indian cherry BRS 366 Jaburu

Ryegrass (Lolium multiflorum Lam.) seed germination and vigor under saline stress

Physiological responses of sweet potato (Ipomoea batatas L.) plants due to different copper concentrations

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