Efeito do estresse salino sobre a concentração de pigmentos e prolina em folhas de arroz

Lima, Maria da Graça de Souza; Fernandes, Nei; Bacarin, Marcos Antônio; Mendes, Cristina Rodrigues

doi:10.1590/s0006-87052004000300003

Cited by 30 publications

(28 citation statements)

References 16 publications

(8 reference statements)

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“…The outcome of increased proline concentration on saline stress has been extensively studied in plants, such as sorghum (De Lacerda et al, 2003), rice (Lima et al, 2004) and canola (Saadia et al, 2012). Specifically on sugar cane, when subjected to 100 mM of NaCl, it is observed the accumulation of this osmolyte in leaves and roots (García and Medina, 2003;Vasantha and Rajlakshmi, 2009;Karpe et al, 2012;Medeiros et al, 2015) which corroborates the present work.…”

Section: Discussionsupporting

confidence: 88%

Response to in vitro salt stress in sugarcane is conditioned by concentration and condition of exposure to NaCl

Granja¹,

Medeiros²,

Silva³

et al. 2018

Acta biol. Colomb.

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Salinity is one of the major environmental stress factors that affect crop productivity, as well as interfering with plant growth and development, resulting in reduced production quality. Given this, we highlight the importance of research in response to plants subjected to salt stress in order to assess the physiological and biochemical behavior of genotypes, with the objective of selecting the more tolerant. One way to ensure the uniformity of the response of the plants is through in vitro cultivation, which allows control of the cultivation conditions. Therefore, the objective of this work was to evaluate the response of two commercial varieties of sugar cane exposed to saline stress in different conditions (gradual and abrupt). Two varieties of sugarcane (RB931011 and RB872552) were subjected to in vitro salt stress by NaCl (56 mM and 112 mM), either gradually or suddenly. The responses of the enzymatic antioxidant system (catalase, peroxidases and ascorbate peroxidase) and free proline, as well as the Na + and K + contents, were assessed 30 days after the beginning of the treatments. Differences were observed in the responses of the varieties as a function of the induction mode of salt stress, graded or by shock, rather than as a function of the NaCl concentrations in the culture medium. The stress response is therefore conditioned not only by salt concentration, but also by the form of exposure to salt.Keywords: antioxidant enzymes, in vitro culture, oxidative stress, salinity. RESUMENLa salinidad es uno de los principales factores de estrés ambiental, además de interferir en el crecimiento de las plantas perjudica directamente la producción agrícola. En ese contexto, se destaca la importancia de investigaciones direccionadas a la respuesta de las plantas sometidas al estrés salino, con el fin de evaluar el comportamiento fisiológico y bioquímico con el objetivo de seleccionar genotipos tolerantes a dicha condición. Una de las técnicas más utilizadas para uniformizar la respuesta de las plantas a una condición en particular es el cultivo de tejidos in vitro. Por lo tanto, el objetivo de este estudio fue evaluar la respuesta de dos variedades comerciales de caña de azúcar (RB931011 e RB872552) expuestas a estrés salino con NaCl (56 mM e 112 mM) en diferentes condiciones, gradual y abrupta. Las respuestas del sistema antioxidante enzimático (catalasa, peroxidasa y ascorbato peroxidasa) y prolina libre, asi como las concentraciones de Na + e K + fueron evaluadas 30 días después del inicio de los tratamientos. Fueron observadas diferencias en la respuesta de las variedades en función del modo de inducción del estrés salino, graduado o abrupto, y no solo en función de las concentraciones de NaCl en el medio de cultivo. La respuesta al estrés es condicionada no solo por la concentración de sal sino también por la forma de exposición al medio salino.Palabras clave: cultivo in vitro, enzimas antioxidantes, estrés oxidativo, salinidad.

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Section: Discussionsupporting

confidence: 88%

Response to in vitro salt stress in sugarcane is conditioned by concentration and condition of exposure to NaCl

Granja¹,

Medeiros²,

Silva³

et al. 2018

Acta biol. Colomb.

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“…Considering the importance of chlorophyll in the first step of photosynthesis, characterized by the photochemical stage, the high content of salts absorbed by the plants contributed to the increase in the activity of chlorophyllase, an enzyme that degrades chlorophyll (Lima et al, 2004), hampering the formation of these pigments and inhibiting the photosynthetic activity of the plants in general (Munns & Tester, 2008, Taiz & Zeiger, 2013. Comparatively, the effects are similar to those reported by Graciano et al (2011) in peanut plants and by Cavalcante et al (2011) in yellow passion fruit, who observed that irrigation with saline water causes a reduction in the chlorophyll activity of these variables in the respective crops.…”

Section: Resultsmentioning

confidence: 99%

“…This leads to higher contents of chlorophyll a (Figure 2A) in relation to chlorophyll b ( Figure 2B) and, consequently, higher values of the chlorophyll a/b ratio ( Figure 2D). The superiority of the coefficients, according to Lima et al (2004), is due to the higher contents of chlorophyll a in the leaves and to the increase of the efficiency of photosynthetic reactions. This pigment actively participates in the first photochemical process of the photosynthesis, while chlorophyll b is an accessory pigment that has as its main function the absorption of light in the wavelength spectrum not absorbable by chlorophyll a (Taiz & Zeiger, 2013).…”

Section: Resultsmentioning

confidence: 99%

Photosynthetic pigments and biomass in noni irrigated with saline waters with and without leaching

Souto

Cavalcante

Gheyi

et al. 2015

Rev. bras. eng. agríc. ambient.

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The response of plants to salt stress is an extremely complex phenomenon that involves morphological, physiological and biochemical changes, modifying the leaf contents of chlorophyll and carotenoids, among others and affecting plant growth, development and production. An experiment was carried out from July 2010 to June 2011, in order to evaluate the contents of chlorophyll a, chlorophyll b, total chlorophyll, carotenoids, the chlorophyll a/b ratio and biomass accumulation of shoots and roots of noni plants, when subjected to irrigation and leaching with water of increasing salinity. The experiment was carried out in a greenhouse, at the Center of Agricultural Sciences of the Federal University of Paraíba, in the municipality of Areia-PB, Brazil. Treatments were distributed in randomized blocks, in a 5 × 2 factorial scheme with four replicates and two plants per plot, and corresponded to levels of electrical conductivity of irrigation water (0.5; 1.5; 3.0; 4.5 and 6.0 dS m-1) in pots with and without leaching. The increase in irrigation water salinity impairs the leaf contents of chlorophyll a, b, total chlorophyll, carotenoids and biomass production of noni plants, but to a lesser extent in all the treatments in which same irrigation water was used for leaching.

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“…This amino acid is a biochemical marker of metabolic changes generated by different types of stress conditions. (Lima, 2004) It is synthesized by glutamate, and also by the arginine/ornithine cycle which has the same route as urease. At this phase, it was found that proline synthesis may be favored by low activity of urease.…”

Section: Titanium and The Activity Of Enzymesmentioning

confidence: 99%

Titanium (Ti) in plant nutrition - A review

Bacilieri¹,

Vasconcelos²,

Lana³

et al. 2017

Aust J Crop Sci

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Several studies have been carried out on the application of titanium in plant nutrition in recent decades. They indicate that this element has a positive effect on crop phenological events such as germination, root formation, vegetative growth, maturation, as well as resistance to biotic or abiotic stress conditions and general crop health status. Titanium has also been reported to boost the uptake of macro and micronutrients, enzymatic activity in plants, and consequently increase yield. Therefore, pioneering studies of foliar applications of titanium in potato crops are being carried out in Brazil. They demonstrate that titanium reduces urease enzyme activity, but increases peroxidase and nitrate reductase activity during potato growth. During tuberization, there is a positive correlation between superoxide dismutase & peroxidase enzyme activity and titanium application. Although the results are promising, more data is needed regarding the effects of this element on crop performance. This review describes the characteristics of this element and reports innovations regarding its use in plant nutrition.

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Efeito do estresse salino sobre a concentração de pigmentos e prolina em folhas de arroz

Cited by 30 publications

References 16 publications

Response to in vitro salt stress in sugarcane is conditioned by concentration and condition of exposure to NaCl

Response to in vitro salt stress in sugarcane is conditioned by concentration and condition of exposure to NaCl

Photosynthetic pigments and biomass in noni irrigated with saline waters with and without leaching

Titanium (Ti) in plant nutrition - A review

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