scholarly journals Photochemical efficiency of basil cultivars fertigated with salinized nutrient solutions

2020 ◽  
Vol 24 (5) ◽  
pp. 319-324
Author(s):  
Sandy T. dos Santos ◽  
Francisco de A. de Oliveira ◽  
Giordanio B. S. Oliveira ◽  
Francisco V. da S. Sá ◽  
Jessilanne P. B. de M. Costa ◽  
...  
Keyword(s):  
Salt Stress ◽  
Chlorophyll Fluorescence ◽  
Block Design ◽  
Photochemical Efficiency ◽  
Light Conditions ◽  
High Salinity Water ◽  
Randomized Block Design ◽  
Full Flowering ◽  
Salinity Water ◽  
Nutrient Solutions

ABSTRACT Reduction in plant growth under salt stress is due, among other factors, to changes in photochemical efficiency and, consequently, in photosynthesis. The objective of this study was to evaluate the effect of salt stress on the chlorophyll fluorescence variables in cultivars of basil (Ocimum basilicum L.). The experiment was conducted in a greenhouse, using a randomized block design in a 5 x 3 factorial scheme, corresponding to five basil cultivars (‘Grecco a Palla’, ‘Alfavaca Basilicão’, ‘Alfavaca Verde’, ‘Lemoncino’ and ‘Roxo’) and three salinity of the nutrient solution (2.0, 3.5 and 5.0 dS m-1), with three repetitions, and the experimental plot was represented by three pots containing 3.0 dm3 of coconut fiber. At the full flowering stage, plants were evaluated for chlorophyll fluorescence, when adapted to the dark, as well as under saturating light conditions. In general, there were changes in fluorescence variables only at salinity above 3.5 dS m-1. Fertigation using high-salinity water promotes strong changes in the chlorophyll a fluorescence of sensitive basil cultivars. The cultivars ‘Grecco a Palla’ and ‘Alfavaca Verde’ were little affected by the increase of salinity, being the most tolerant to salt stress. In the cultivars ‘Alfavaca Basilicão’, ‘Lemoncino’ and ‘Roxo’, chlorophyll fluorescence was strongly affected by salinity, being the most sensitive. The tolerance ranking based on chlorophyll fluorescence is: ‘Grecco a Palla’ = ‘Alfavaca Verde’ > ‘Alfavaca Basilicão’ > ‘Lemoncino’ > ‘Roxo’.

scholarly journals Tolerance of peanut (Arachis hypogea) genotypes to salt stress in the initial phase

2020 ◽  
Vol 24 (1) ◽  
pp. 37-43 ◽  
Author(s):  
Francisco V. da S. Sá ◽  
Manoel G. dos Santos ◽  
Aurélio P. Barros Júnior ◽  
José R. T. de Albuquerque ◽  
Almir R. E. de Souza ◽  
...  
Keyword(s):  
Salt Stress ◽  
Block Design ◽  
Biomass Accumulation ◽  
High Salinity Water ◽  
Arachis Hypogea ◽  
Randomized Block Design ◽  
Irrigation Water Salinity ◽  
Salinity Water ◽  
Tolerance To Salinity

ABSTRACT This study aimed to evaluate the emergence, growth, biomass accumulation and tolerance of peanut genotypes under salt stress. The experiment was conducted in a protected environment (greenhouse), evaluating six peanut genotypes (Tatuí, L7151, Caiapó, IAC8112, IAC881 and Havana), which were subjected to two levels of irrigation water salinity (0.5 [control] and 3.5 dS m-1), arranged in a 6 x 2 factorial scheme, in a randomized block design, with five repetitions, with two plants per plot. Plants were cultivated for 30 days after sowing in lysimeters with capacity for 0.5 dm3, filled with a mixture of non-saline, non-sodic soil and commercial substrate in 1:1 proportion on volume basis. During this period, plants were evaluated for emergence, growth, biomass accumulation, tolerance to salinity and dissimilarity. The genotypes Tatuí and L7151 are the most sensitive to salt stress in the emergence stage. Irrigation with high-salinity water reduced the growth and biomass accumulation of the peanut genotypes, and Caiapó and IAC8112 were the least affected. The classification of salinity tolerance had the following sequence: Caiapó > IAC8112 > Havana > Tatuí > IAC881 > L7151.

scholarly journals Photosynthetic performance in Eucalyptus clones cultivated in saline soil

2019 ◽  
pp. 368
Author(s):  
Jailma Ribeiro de Andrade ◽  
Sebastião de Oliveira Maia Júnior ◽  
Andrea Francisca da Silva Santos ◽  
Vicente Mota da Silva ◽  
L.T. Bezerra, J.R.R. da Silva, C.M. Santos, V.M. Ferreira, L. Endres
Keyword(s):  
Salt Stress ◽  
Block Design ◽  
Photosynthetic Pigment ◽  
Photochemical Efficiency ◽  
Dry Mass ◽  
Photosynthetic Performance ◽  
Saline Stress ◽  
Physiological Indicators ◽  
Photochemical Efficiency Of Psii ◽  
Randomized Block Design

The aim of this study was to evaluate the photosynthetic performance of Eucalyptus clones with the aim of identifying their tolerance to soil saline stress conditions. The experiment was arranged in a randomized block design with a 3 × 4 factorial arrangement: in five replications, totaling 60 plots, three Eucalyptus clones were used, VC865, I224, and I144, which were exposed to four concentrations of NaCl (0, 1, 2 and 3 g NaCl kg-1 of soil). Clone I144 shows mechanisms of salinity tolerance as smaller reductions in the stomatal conductance, transpiration, photosynthesis, photochemical efficiency of PSII, photosynthetic pigment content and total dry mass. On the other hand, clone I224 presents greater physiological damage, indicating high susceptibility to salt stress, while VC865 shows moderate sensitivity to salinity. Variables related to photosynthetic performance, such as gas exchange, photochemical efficiency of PSII and photosynthetic pigments are potentially reliable physiological indicators for selecting of tolerant Eucalyptus clones to salt stress.

scholarly journals Calcium in the mineral nutrition of yellow passion fruit cultivated in lined pits and with saline water

2021 ◽  
Vol 25 (4) ◽  
pp. 256-263
Author(s):  
Marlene A. F. Bezerra ◽  
Lourival F. Cavalcante ◽  
Francisco T. C. Bezerra ◽  
Walter E. Pereira ◽  
Flaviano F. de Oliveira ◽  
...  
Keyword(s):  
Salt Stress ◽  
Saline Water ◽  
Block Design ◽  
Passion Fruit ◽  
Water Salinity ◽  
Water Losses ◽  
Randomized Block Design ◽  
Full Flowering ◽  
Calcium Fertilization ◽  
Yellow Passion Fruit

ABSTRACT Nutritional status is an important tool in salinity management, because salt stress interferes with both the absorption and the assimilation of mineral nutrients by plants. The objectives of this experiment were to evaluate the effects of water salinity, lateral protection of pits against water losses and calcium doses on the leaf concentration of macronutrients and sodium of yellow passion fruit cv. BRS GA1. The treatments were arranged in a randomized block design in split plots in a 2 × (2 × 5) factorial scheme, corresponding to water salinity (0.3 and 4.0 dS m-1) in the main plot, and the combinations between lateral protection of pits (without and with) and calcium doses (0, 30, 60, 90 and 120 kg ha-1) in the subplots. Leaf concentrations of macronutrients and sodium were determined at the phenological stage of full flowering. Irrigation of yellow passion fruit with 4.0 dS m-1 water decreased the leaf concentrations of macronutrients. The lining of the pits compromised macronutrient concentration in the plants. Calcium fertilization is recommended for yellow passion fruit cultivated in Entisol with low calcium concentration at the dose of 60 kg ha-1, because it raises nitrogen and calcium concentrations in plants irrigated with non-saline water and magnesium and sulfur concentrations in those irrigated with saline water. Calcium attenuates salt stress because it promotes the accumulation of macronutrients in yellow passion fruit under saline conditions.

scholarly journals Effect of water salinity and potassium doses on physiological traits and growth of ‘Embrapa 51’ precocious dwarf cashew (Anacardium occidentale L.) rootstock

2020 ◽  
pp. 1748-1755
Author(s):  
Geovani Soares de Lima ◽  
Jailson Batista da Silva ◽  
Lauriane Almeida dos Anjos Soares ◽  
Reginaldo Gomes Nobre ◽  
Hans Raj Gheyi ◽  
...  
Keyword(s):  
Salt Stress ◽  
Photosystem Ii ◽  
Saline Water ◽  
Block Design ◽  
Photochemical Efficiency ◽  
Water Salinity ◽  
Carotenoid Content ◽  
Potassium Fertilization ◽  
Randomized Block Design ◽  
Salinity Levels

In the semiarid regions, plants are constantly exposed to different conditions of abiotic stresses due to the occurrence of excess salts in both soil and water. Thus, it is extremely important to identify an alternative capable of minimizing the effects of salt stress on plants as a way to ensure the expansion of irrigated areas. In this context, this study aimed to evaluate the chloroplast pigments, photochemical efficiency and growth of ‘Embrapa 51’ precocious dwarf cashew as a function of irrigation with saline water and potassium fertilization in the rootstock formation stage. The study was conducted under greenhouse conditions in the municipality of Pombal, PB, Brazil, using a randomized block design in a 5 x 2 factorial scheme, corresponding to five levels of irrigation water electrical conductivity - ECw (0.4; 1.2; 2.0; 2.8 and 3.6 dS m-1) and two doses of potassium fertilization - KD (100 and 150% of the recommendation corresponding to 150 and 225 g K2O kg-1 soil), with two plants per plot and three replicates. Water salinity from 0.4 induced reductions in chlorophyll a and b synthesis, maximum and variable fluorescence and growth in sexually propagated precocious dwarf cashew seedlings and increases in carotenoid content and initial chlorophyll fluorescence. The quantum efficiency of photosystem II in cashew plants was decreased sharply with the increment in water salinity levels, standing out as indicative of damage to the photosystem II reaction centres. 'Embrapa 51' precocious dwarf cashew plants can be classified as sensitive to water salinity above 0.4 dS m-1. Potassium doses of 100 and 150% of the recommendation did not alleviate the effects of salt stress during the precocious dwarf cashew rootstock production phase.

scholarly journals PRODUCTION CHARACTERISTICS OF SESAME GENOTYPES UNDER DIFFERENT STRATEGIES OF SALINE WATER APPLICATION

2020 ◽  
Vol 33 (2) ◽  
pp. 490-499
Author(s):  
GEOVANI SOARES DE LIMA ◽  
CASSIANO NOGUEIRA DE LACERDA ◽  
LAURIANE ALMEIDA DOS ANJOS SOARES ◽  
HANS RAJ GHEYI ◽  
RAILENE HÉRICA CARLOS ROCHA ARAÚJO
Keyword(s):  
High Salinity ◽  
Saline Water ◽  
Block Design ◽  
Limiting Factor ◽  
High Salinity Water ◽  
Low Salinity ◽  
Randomized Block Design ◽  
Salinity Water ◽  
Sesame Genotypes ◽  
Total Seed

ABSTRACT In semiarid areas, the scarcity of water with low salt concentration associated with irregular precipitation becomes a limiting factor to ensure agricultural production. In this context, the objective of this study was to evaluate the growth and production of sesame genotypes under different strategies of use of saline water. The experiment was conducted under protected environment conditions, using a randomized block design in a 6 x 2 factorial scheme, and the treatments consisted of six strategies for the use of saline water in the different stages of plant development (SE = irrigation with low-salinity water throughout the cultivation cycle; VE, FL, FR, VE/FL and VE/FR - respectively, irrigation with high-salinity water at the vegetative stage, flowering, fruiting, vegetative/flowering and vegetative/fruiting) and two sesame genotypes (BRS Seda and BRS Anahí), with 4 replicates. Irrigation with high-salinity water (ECw = 2.7 dS m-1) during the vegetative, flowering and fruiting stages did not compromise sesame production. There were reductions in sesame growth when irrigation with high-salinity water was continuously applied at the vegetative/flowering stages and in sesame production when it was applied during the vegetative/flowering and vegetative/fruiting stages. The greater growth of BRS Seda sesame plants resulted in an increase in the total number of fruits and in the total seed weight.

scholarly journals Cekaman Garam NaCl danTeknik Aplikasi Azolla pada Tanaman Padi

2020 ◽  
Vol 25 (3) ◽  
pp. 349-355
Author(s):  
Fitri Krismiratsih ◽  
Sugeng Winarso ◽  
Slamerto Slamerto
Keyword(s):  
Salt Stress ◽  
Block Design ◽  
Ground Cover ◽  
Dry Weight ◽  
Soil Conditions ◽  
Application Technique ◽  
Rice Plants ◽  
Root Dry Weight ◽  
Randomized Block Design ◽  
Salinity Levels

Efforts to increase production potential can be carried out by extensification in a less productive saline land. Salinity is a major problem in the growth of most plants. Azolla is a plant that is sensitive to salinity, but if it is applied well, it can grow optimally at high salinity levels. The purpose of this study is to obtain an azolla application technique that is effective in increasing the adaptation of rice plants to NaCl saline soil conditions. The experimental design used was Randomized Block Design (RBD) with 2 factors and 3 replications. The first factor was the azolla application technique consisted of 3 levels: fresh azolla composted, fresh azolla immersed, and fresh azolla as a ground cover. The second factor was the levels of NaCl salt stress consisted of 4 levels: control DHL 0, 2, 4, and 8 dS m-1. The adaptation ability of rice plants based on variable plants height growth rate, number of tillers, strove dry weight, root dry weight, stomata density, leaf chlorophyll (SPAD), age of flowering, number of paddy grain, and harvest index. The results showed how to test content up to 2 dS m-1 which increased rice growth especially the application of azolla composted. Increasing stress to 4 and 8 dS m-1showed bad effects on vegetative, physiology, and yields of rice components. The stronger of salt stress the higher all plants growth variables except the age of flowering that actually showed the acceleration of flowering. Application of composted azolla can increase the root dry weight and azolla as a ground cover can increase the numbers of paddy grains.   Keywords: azolla, NaCl, rice, stress

scholarly journals Linear Relationships Between Yield, Quality and Phenological Traits of Strawberry Cultivars

2020 ◽  
Vol 8 (3) ◽  
pp. 737
Author(s):  
Maria Inês Diel ◽  
Alessandro Dal’Col Lúcio ◽  
Denise Schmidt ◽  
Marcos Vinícius Marques Pinheiro ◽  
Tiago Olivoto ◽  
...  
Keyword(s):  
Fruit Quality ◽  
Block Design ◽  
Indirect Selection ◽  
High Productivity ◽  
Selection Processes ◽  
Linear Relationships ◽  
Randomized Block Design ◽  
Full Flowering ◽  
Yield Quality ◽  
High Production

The great economic importance attributed to strawberry cultivation raises the interest in cultivars of high productivity and superior fruit quality. The quality of fruit is the most impacting factor for the strawberry marketing, but selecting genotypes that combine high production and high fruit quality has been a difficult task. The objective of this study was to determine the linear relationships between phenological, quality and production variables of strawberry aiming at identifying potential variables for indirect selection in future selection processes of strawberry genotypes. A trial was conducted in a randomized block design with two cultivars and two transplant origins, grown in four types of substrate. Fifteen variables, including phenological, productive and fruit quality-related variables were assessed. The selected variables explained 45.2 and 39.1 % for PC1 and PC2 respectively, totaling 84.3 % of the total variance of the variables in the PCA, and indicated important relationships between the variables, and a path analysis revealed success for indirect selection of total mass of fruits based on the total number of fruits (0.81413). Changes in crop management that reduces the period between planting date and full flowering may be an alternative to increase the production of strawberry and provide fruits with higher quality.

scholarly journals Calcium and potassium contents in nutrient solution on Phoma leaf spot intensity in coffee seedlings

Revista CERES ◽  
2016 ◽  
Vol 63 (4) ◽  
pp. 486-491 ◽  
Author(s):  
Aricléia de Moraes Catarino ◽  
Edson Ampélio Pozza ◽  
Adélia Aziz Alexandre Pozza ◽  
Leone Stabile dias Santos ◽  
Gabriel Brandão Vasco ◽  
...  
Keyword(s):  
Nutrient Solution ◽  
Leaf Spot ◽  
Block Design ◽  
Fungal Diseases ◽  
Growth Chamber ◽  
Spot Intensity ◽  
Controlled Conditions ◽  
Progress Curve ◽  
Randomized Block Design ◽  
Nutrient Solutions

ABSTRACT Coffee is one of the main export commodities of Brazilian agribusiness. Phoma leaf spot [Phoma tarda (Stewart) Boerema & Bollen] is one of the most important coffee fungal diseases in Brazil. Therefore, this study aimed to evaluate the intensity of Phoma leaf spot in coffee seedlings supplied with different rates of Ca+2 and K+. The study was conducted under controlled conditions in a growth chamber, at the Department of Phytopathology - UFLA, from February 2010 to December 2011. The assay was repeated twice under the same conditions. The nutrient solutions consisted of five concentrations of K+ (3, 4, 5, 6, 7 mmol L-1) and Ca+2 (2, 4, 6, 8 and 10 mmol L-1). The experiment was arranged in a randomized block design, with 25 treatments and three replicates, with two plants per plot. The areas under incidence progress curve (AUIPC) and severity (AUSPC) were calculated. At the lowest rate of Ca2+ (2 mmol L-1) and highest K+ (6 and 7 mmol L-1), approximately, the AUIPC was the smallest. For the AUSPC, the lowest rates of Ca+2 and K+ resulted in the lowest severities. Supply of Ca+2 and K+ in nutrient solution reduced AUIPC and AUSPC of Phoma leaf spot, and these nutrients can be recommended for the management of the disease.

scholarly journals Morphophysiology of Tahiti lime grafted onto Sunki mandarin hybrids under salt stress

2019 ◽  
Vol 23 (8) ◽  
pp. 598-606
Author(s):  
Luderlândio A. Silva ◽  
Marcos E. B. Brito ◽  
Pedro D. Fernandes ◽  
Francisco V. da S. Sá ◽  
Rômulo C. L. Moreira ◽  
...  
Keyword(s):  
Salt Stress ◽  
Saline Water ◽  
Block Design ◽  
Flowering Stage ◽  
Gas Exchanges ◽  
Rangpur Lime ◽  
Randomized Block Design ◽  
Irrigation Water Salinity ◽  
Electrical Conductivities ◽  
One Year

ABSTRACT This study aimed to evaluate the growth and physiology of citrus scion/rootstock combinations irrigated with saline water until the pre-flowering stage. The experiment was conducted in drainage lysimeters with capacity for 150 dm3, in randomized block design in a 2 x 10 factorial scheme, corresponding to two electrical conductivities of water (S1 = 0.3 and S2 = 3.0 dS m-1) and ten scion/rootstock combinations (nine hybrids and one commercial variety) grafted with Tahiti lime, in three repetitions and one plant per plot. Grafted seedlings were transplanted one year after sowing, subjected to salt stress from 15 days after transplanting until the pre-flowering period, and evaluated for gas exchanges and growth. The irrigation with 3.0 dS m-1 saline water did not influence the photosynthetic activity of the studied citrus scion/rootstock combinations until the pre-flowering. The genotype Santa Cruz Rangpur lime (LCRSTC) was more sensitive to irrigation water salinity in terms of growth. The least sensitive combinations to salinity were Tahiti lime grafted onto TSKFL x (LCR x TR) - 018, TSKFL x TRBK - 011 and TSKFL x TRBK - 30.

scholarly journals Genetic Divergence Analysis of Rice Genotypes under Salt Stress Environment

2020 ◽  
pp. 33-39
Author(s):  
Anuj Kumar ◽  
D. K. Dwivedi ◽  
Pradeep K. Bharti ◽  
Shivani . ◽  
Preeti Kumari ◽  
...  
Keyword(s):  
Salt Stress ◽  
Normal Condition ◽  
Genetic Divergence ◽  
Block Design ◽  
Stress Conditions ◽  
Saline Condition ◽  
Randomized Block Design ◽  
Cluster Distance ◽  
Rice Genotypes ◽  
Cluster 2

The present investigations were conducted in randomized block design with three replications within the net house of the department of PMB&GE, A. N.D.U.A.T, Kumar Ganj, Ayodhya to estimate the genetic divergence under normal and salt stress conditions involving 20 rice genotypes during Kharif 2018-19, on the basis of relative parameters of D2 values, the clustering pattern of 20 rice genotypes under normal and salt stress conditions were grouped into five non-overlapped clusters. Under normal condition, Cluster III having highest 7 rice genotypes, Cluster II having 5 genotypes, cluster V having 4 genotypes and IV having highest 3 rice genotype. Cluster I having only one genotype. Under saline condition, Cluster I having highest rice 6 genotypes, cluster III having 5 genotypes and cluster II & IV having 4 genotypes respectively. Cluster V having only one genotype. It means the genetic similarity was found in the genotypes were expressed within the cluster and the pattern of distribution of genotypes in various clusters exhibited that topographical diversity wasn't associated with ancestral diversity as genotypes of same countryside were grouped into different cluster and vice-versa. The highest inter cluster distance was recorded between cluster 2 and cluster 5 (26108.030) followed by between cluster 1 and cluster 5 (18550.010), cluster 3 and cluster 5 (15231.860), cluster 4 and cluster 5 (5335.860) in normal condition and in saline condition the maximum inter cluster distance was existed between cluster 4 and cluster 5 (2344.091) followed by between cluster 3 and cluster 5 (2067.610), cluster 2 and cluster 5 (1447.564), cluster 1 and cluster 5 (1238.095). The results showed extensive variation from one cluster to other in respect of cluster means for all parameters, which represented that genotypes having distinctly different mean performance for various characters were reported into different clusters.Rice

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