Estresse salino na germinação e formação de porta-enxerto de aceroleira

Gurgel, Marcelo Tavares; Fernandes, Pedro Dantas; Santos, F. J. de S.; Gheyi, Hans Raj; Bezerra, Idelfonso Leandro; Nobre, Reginaldo Gomes

doi:10.1590/s1415-43662003000100006

Cited by 20 publications

(17 citation statements)

References 2 publications

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“…Other authors (Gurgel et al, 2003;Willadino et al, 2011;Almeida et al, 2012), working with genotypes and varieties of different crops also report the deleterious effects of the salts on the physiological variables and growth.…”

Section: Factor Of Variationmentioning

confidence: 94%

Growth of sugar cane varieties under salinity

et al. 2016

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RESUMOSubmitted on 02/20/2014 and approved on 01/20/2016 Growth of sugar cane varieties under salinityLarge salty areas in the Brazilian semi-arid region have limited farming in Northeastern Brazil. One example is the sugar cane cultivation, which reinforces the need of selecting varieties that are more tolerant to salinity. The objective of this study was to evaluate the effect of salinity on growth of ten varieties of sugar cane. The experiment was conducted in a greenhouse, set in the experimental field of Embrapa Semiárido, in Petrolina, Pernambuco State. The experimental design was randomized blocks arranged in a 6 X 10 factorial arrangement, comprised of six levels of salinity (0, 1.0, 2.0, 4.0, 6.0 and 8.0 dS m -1 ) and ten sugar cane varieties (VAT 90212; RB 72454; RB 867515; Q 124; RB 961003; RB 957508; SP791011; RB 835089; RB 92579 and SP 943206). Salt levels of irrigation water were obtained by adding NaCl, CaCl 2 .2H 2 O and MgSO 4 .7H 2 O to achieve an equivalent ratio among Na:Ca:Mg of 7:2:1. Sixty days later, plant height, stem diameter (base), number of leaves, stalks and sprouts, leaf area and fresh and dry mass of the aerial part and roots were all measured. The varieties of sugar cane showed similar responses for growth reduction as soil salinity increases, being considered moderately sensitive to salinity.

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Section: Factor Of Variationmentioning

confidence: 94%

Growth of sugar cane varieties under salinity

et al. 2016

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“…Hereafter, this will be referred to as T1 to T6 plants, respectively. Salt solutions was prepared with 1 M of NaCl, CaCl 2 2 H 2 O, and MgCl 2 6 H 2 O, considering the ratio 7:2:1 for Na:Ca:Mg described in Gurgel et al (2003), as an approximation that represents the majority of available water sources for irrigating semiarid Northeastern Brazil. During the experimental period, maximum photosynthetic photon flux (PPF) reached more than 2,000 μmol m -2 s -1 .…”

Section: Plant Materials and Experimental Designmentioning

confidence: 99%

Photosynthesis and antioxidant activity in Jatropha curcas L. under salt stress

Campos

Hsie

Granja

et al. 2012

Braz. J. Plant Physiol.

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Biodiesel is an alternative to petroleum diesel fuel. It is a renewable, biodegradable, and nontoxic biofuel. Interest in the production of biodiesel from Jatropha curcas L. seeds has increased in recent years, but the ability of J. curcas to grow in salt-prone areas, such as the Caatinga semiarid region, has received considerably meager attention. The aim of this study was to identify the main physiological processes that can elucidate the pattern of responses of J. curcas irrigated with saline water, which commonly occurs in the semiarid Caatinga region. This study measured the activity of the antioxidant enzymes involved in the scavenging of reactive oxygen species, which include catalase (CAT) and ascorbate peroxidase (APX), as well as malondialdehyde (MDA) levels. The levels of chlorophyll (Chl), carotenoids, amino acids, proline, and soluble proteins were also analyzed. The net carbon assimilation rate (P N ), stomata conductance (g s ), and transpiration rate (E) decreased with salt stress. The activities of CAT and APX were decreased, while H 2 O 2 and MDA levels as well as electrolyte leakage were significantly increased in salt-stressed plants compared to the untreated ones. These observations suggest that the ability of J. curcas plants resist to salt stress is associated with the activities of protective enzymes and their defensive functions. However, our results indicate that the reactive oxygen species scavenging system is not sufficient to protect J. curcas leaves against oxidative damage caused by salt stress, and, therefore, it cannot be treated as a salt tolerant plant species.

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“…It is noted that plants subjected to the treatment S 1 (control -ECw of 0.5 dS m -1 ) increased the rate of A by 9.09 μmol m -2 s -1 in relation to plants cultivated under irrigation with water of different ionic composition,S 2 ; S 3 ; S 4 and S 5 (Na + ; Ca 2+ ; K + and Na + +Ca 2+ +Mg 2+ ) and ECw of 5.0 dS m -1 . The high saline concentration of the irrigation water causes reduction in the water potential of the soil and, as a consequence, the stomata close, thus reflecting in low CO 2 assimilation rate (Gurgel et al, 2003).This decline in the CO 2 assimilation rate of sunflower plants is also related to the damage in the photosynthetic apparatus and /or in the enzymatic system of CO 2 fixation (Kurban et al, 1999), due to the irrigation with water of different cationic nature and by the variation in ECw levels. Similar results were also verified in cotton (Meloni et al, 2003) and jatropha (Sousa et al, 2012b).…”

Section: Resultsmentioning

confidence: 99%

Gas exchange and production of sunflower (Helianthus annuus L.) irrigated with water of different salinity, cationic nature and nitrogen doses

Júnior¹,

Lima²,

Gheyi³

et al. 2017

Aust J Crop Sci

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This study aimed to evaluate the gas exchanges and production components of sunflower, cv. BRS 324, as a function of irrigation with water of different salinity levels and cationic nature associated with doses of nitrogen (N). The study was conducted in pots adapted as lysimeters, under field conditions, in an eutrophic Grey Argisol of sandy loam texture. The experimental design was randomized blocks, in 5 x 5 factorial scheme, with three replicates, corresponding to five combinations of water salinity and cationic nature -S (S 1 -Control; S 2 -NaCl; S 3 -CaCl 2 ; S 4 -KCl and S 5 -NaCl+CaCl 2 +MgCl 2 ) and five N doses (50; 75; 100; 125 and 150 mg of N kg -1 of soil). Irrigation was applied using water with electrical conductivity -ECw of 0.5 dS m -1 for the control (S 1 ) and 5.0 dS m -1 for the other treatments (S 2 ; S 3 ; S 4 and S 5 ). Gas exchange through stomatal conductance, transpiration, CO 2 assimilation rate, internal CO 2 concentration and intrinsic water use efficiency were evaluated and the production components were determined by the internal diameter of the capitulum, the phytomass of the capitulum with achenes and dry matter of the capitulum. The gas exchange of sunflower cv. BRS 324 were significantly influenced, being the biggest decrease due to the variation in the ECw when compared with the cationic nature of irrigation water. Among the evaluated cations, potassium promoted the highest value of stomatal conductance and CO 2 assimilation rate. Irrigation with saline water negatively affected the production components of sunflower, regardless of the cation present in the irrigation water.

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Estresse salino na germinação e formação de porta-enxerto de aceroleira

Cited by 20 publications

References 2 publications

Growth of sugar cane varieties under salinity

Growth of sugar cane varieties under salinity

Photosynthesis and antioxidant activity in Jatropha curcas L. under salt stress

Gas exchange and production of sunflower (Helianthus annuus L.) irrigated with water of different salinity, cationic nature and nitrogen doses

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