scholarly journals Aluminum tolerance in castor bean lines1

2018 ◽  
Vol 48 (3) ◽  
pp. 299-305
Author(s):  
Lucas Barbosa de Freitas ◽  
Dirceu Maximino Fernandes ◽  
Suelen Cristina Mendonça Maia ◽  
Laerte Gustavo Pivetta ◽  
Maurício Dutra Zanotto
Keyword(s):  
Castor Bean ◽  
Block Design ◽  
Aluminum Tolerance ◽  
Acid Soils ◽  
Al Tolerance ◽  
Tropical Regions ◽  
Randomized Block Design ◽  
Bean Plants ◽  
Management Techniques ◽  
Adequate Management

ABSTRACT Castor bean plants are susceptible to aluminum (Al) in the soil, requiring adequate management techniques for their cultivation in acid soils containing high Al levels, as it occurs in tropical regions. This study aimed to assess the Al tolerance of castor bean lines. A randomized block design, in a 2 x 9 factorial scheme, with four replicates, was used. The treatments consisted of presence and absence of Al, as well as nine castor bean lines (CRZ H06, CRZ H11, CRZ H12, CRZ H15, CRZ H17, CRZ H18, CRZ H19, CRZ H22 and FCA). Based on a distribution into quartiles, the lines were divided into two groups. The Al-tolerant group contained the CRZ H06, H11 and H17 lines, while the group susceptible to Al was composed of CRZ H12, H15, H18, H19, H22 and FCA. The FCA and CRZ H17 lines showed the highest growth, when cultivated without Al.

scholarly journals IDENTIFICATION OF Ricinus communis HYBRIDS FOR LOW PLANT HEIGHT1

2021 ◽  
Vol 34 (4) ◽  
pp. 837-845
Author(s):  
FREDSON DOS SANTOS MENEZES ◽  
SIMONE ALVES SILVA ◽  
GEAN CARLO SOARES CAPINAN ◽  
HELISON SANTOS BRASILEIRO ◽  
LAURENICE ARAÚJO DOS SANTOS
Keyword(s):  
Plant Height ◽  
Castor Bean ◽  
Ricinus Communis ◽  
Block Design ◽  
Direct Selection ◽  
Randomized Block Design ◽  
Ricinus Communis L ◽  
Bean Plants ◽  
Stem Internode ◽  
High Heritability

ABSTRACT Castor bean (Ricinus communis L.) is a plant native to Africa that presents important socioeconomic value for many countries, and has been the subject of breeding programs. In this context, the objective of this work was to identify genotypes with potential for improvement, focused on lowering plant height, using 19 hybrids and eight parents of R. communis. The study was developed at the experimental area of the Federal University of Recôncavo da Bahia in Cruz das Almas, BA, Brazil. The experiment was conducted in 2017 using a randomized block design with three replications, consisting of eight parents and 19 hybrids resulting from hybridization of these parents, grown with spacing of 3 meters between rows and 1 meter between plants. The characters stem diameter (SD), primary raceme insertion height (PRI), number of stem internodes (NSI), mean stem internode length (SIL), plant height (PH), number of harvested racemes (NHR), primary raceme length (PRL), and effective raceme length (ERL) were evaluated by analyzing the genetic parameters of variances and correlation between them. Five (H17, H2, H11, H13, and H6) of the 19 hybrids evaluated have potential to decrease PH of castor bean plants, presenting heights below 1.07 m. Direct selection for plant height is the most indicated for this purpose due to the high heritability of the character. However, the characters SD, PRI, and SIL stood out by assisting in indirect selection to decrease plant height because they can be early measured and present high heritability and strong correlation with PH.

scholarly journals Productivity of castor bean plants intercropped at different plant densities with Urochloa ruziziensis

2019 ◽  
Vol 23 (2) ◽  
pp. 109-113 ◽  
Author(s):  
Carlos F. dos S. Cordeiro ◽  
Fábio R. Echer ◽  
Lucas H. T. Pires ◽  
José E. Creste
Keyword(s):  
Grain Yield ◽  
High Temperatures ◽  
Castor Bean ◽  
Plant Density ◽  
Block Design ◽  
Raw Material ◽  
Low Fertility ◽  
Randomized Block Design ◽  
Bean Plants ◽  
Plant Densities

ABSTRACT Castor bean is an important raw material to produce biofuel in Brazil and can be grown in several regions of the country due to its good adaptation and tolerance to high temperatures and water deficit. The objective of this study was to evaluate the productivity of castor bean plants intercropped at different plant densities with Urochloa ruziziensis. The experiment was conducted in a randomized block design with four replications, using a 4 × 2 factorial arrangement, consisting of four plant densities (13,574, 24,512, 36,816, and 40,723 plants ha-1) of castor bean and two crop systems (single crop, and intercrop with Urochloa ruziziensis). The data were subjected to analyses of variance and regression, and means were compared by the Tukey’s test (p < 0.05). The intercrop system reduced the number of pods per plant by 15%, but it did not significantly affect the castor bean grain yield. Increasing plant density reduced linearly the proportion of plants harvested, reaching 22.1%, from the lowest to the highest plant density used; the highest grain yield was achieved using 36,816 plants ha-1 for both intercrop and single crop systems. Intercropping castor bean with U. ruziziensis does not reduce the castor bean grain yield and is an alternative to produce biomass for following crops, especially in production environments with low fertility soils, high temperatures, and infrequent rainfall.

scholarly journals Deficiency symptoms and uptake of micronutrients by castor bean grown in nutrient solution

2012 ◽  
Vol 36 (1) ◽  
pp. 233-242 ◽  
Author(s):  
José Lavres Junior ◽  
Cleusa Pereira Cabral ◽  
Mônica Lanzoni Rossi ◽  
Thiago Assis Rodrigues Nogueira ◽  
Neusa de Lima Nogueira ◽  
...  
Keyword(s):  
Nutrient Solution ◽  
Castor Bean ◽  
Cell Walls ◽  
Dry Matter ◽  
Block Design ◽  
Cell Ultrastructure ◽  
Fruit Yield ◽  
Deficiency Symptoms ◽  
Randomized Block Design ◽  
Bean Plants

Castor bean is a nutrient-demanding species, but there is still little information on its micronutrient requirements. The objectives of this study were to evaluate the effects of levels of B (2.5, 12.5 and 25.0 µmol L-1), Cu (0.05, 0.25 and 0.50 µmol L-1), Mn (0.2, 1.0 and 2.0 µmol L-1) and Zn (0.2, 1.0 and 2.0 µmol L-1) in a nutrient solution on plant B, Cu, Mn and Zn concentrations and uptake, vegetative growth and fruit yield of castor bean "Iris", grown in greenhouse. The experiment was arranged in a completely randomized block design with three replicates. The first deficiency symptoms were observed for B, followed by Zn, Cu and Mn. The main changes in the cell ultrastructure due to lack of B were thickening of the cell walls and middle lamellae, distorted chloroplasts and tightly stacked thylakoids, besides the absence of starch grains. The Mn, Zn and Cu deficiencies led to disruption of chloroplasts, disintegration of thylakoids and absence of amyloplasts. The concentration and uptake of B, Cu, Mn, and Zn in castor bean plants increased with micronutrient supply in the solution. Fruit yield was drastically reduced by B and Mn deficiencies. On the other hand, the dry matter yield of the shoot and root of castor bean plants was not. In the treatment with full nutrient solution, the leaves accumulated 56 and 48 % of the total B and Mn taken up by the plants, respectively, and the seeds and roots 85 and 61 % of the total Cu and Zn taken up, respectively. This shows the high demand of castor bean Iris for B and Mn for fruit yield.

scholarly journals Yield of castor bean fertilized with sewage sludge and potassium and magnesium sulphate

2015 ◽  
Vol 19 (8) ◽  
pp. 773-779 ◽  
Author(s):  
Thâmara F. M. Cavalcanti ◽  
Geraldo R. Zuba ◽  
Regynaldo A. Sampaio ◽  
João P. Carneiro ◽  
Ely S. A. de Oliveira ◽  
...  
Keyword(s):  
Organic Matter ◽  
Sewage Sludge ◽  
Castor Bean ◽  
Block Design ◽  
Additional Treatment ◽  
Iron Copper ◽  
Maximum Value ◽  
Randomized Block Design ◽  
N Requirement ◽  
Bean Leaves

<title>ABSTRACT</title><p>The aim of this study was to evaluate the yield and nutrition of castor bean in response to fertilization with sewage sludge and potassium (K) and magnesium (Mg) sulphate. The experiment was carried out from January to July 2011. The treatments, in a randomized block design with three replicates, in a Nitosol, corresponded to a factorial scheme (2 x 4 +1): two doses of K and Mg sulphate combined with four doses of sewage sludge (0, 2.60, 5.20 and 10.40 t ha<sup>-1</sup>, dry basis), applied based on its nitrogen (N) content and the N requirement for the crop and an additional treatment with NPK. The castor bean grain yield fertilized with sewage sludge did not differ from conventional fertilization, with the maximum value achieved at a dose of 7.5 t ha<sup>-1</sup> of sewage sludge. The fertilization with sewage sludge increased zinc and copper levels in the soil to values close to or higher than those in conventional fertilization, without any influence on the concentrations in the leaf. Fertilization with K and Mg sulphate increased the levels of these cations in the soil without affecting the concentrations in the leaves. The fertilization with sewage sludge increased the contents of organic matter, sulfur, zinc, iron, copper and boron in the soil, and manganese and boron in castor bean leaves.</p>

scholarly journals Insights into the Positive Effect of Pyraclostrobin on Sugarcane Productivity

Agronomy ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 122 ◽  
Author(s):  
Amanda Moreira Lopes ◽  
Pedro Schumacher ◽  
Aurora Terylene Pérez Martínez ◽  
Antônio Paulino da Costa Netto ◽  
Antonio Chalfun-Junior
Keyword(s):  
Block Design ◽  
Positive Influence ◽  
Randomized Block Design ◽  
Rate Of Photosynthesis ◽  
Enzyme Superoxide Dismutase ◽  
Management Techniques ◽  
Stalk Yield ◽  
Sugarcane Productivity ◽  
High Yields ◽  
Positive Effect

Achieving high yields is a challenge for sugarcane producers due to the diverse environmental conditions to which the crop is subjected. In tropical and subtropical regions, where sugarcane is typically cultivated, crop diseases are common. This necessitates the development of disease management techniques. Among these techniques, chemical control is of particular significance due to the development of new antifungal agents, such as pyraclostrobin. For some crops, pyraclostrobin has a positive influence on yield due to its effects on plant physiology. The aim of this study was to evaluate the physiological responses and yield of three sugarcane cultivars treated with the fungicide, pyraclostrobin. The experiment was performed in a randomized block design (RBD) with a split-plot arrangement; the variables analyzed were the application or non-application of fungicide in the plots and, in the subplots, the evaluation times after fungicide application. Both the rate of photosynthesis and the antioxidant enzyme (Superoxide Dismutase, Catalase and Ascorbate Peroxidades) activity increased in plants treated with fungicide in comparison to untreated plants, and in the RB855156 cultivar the stomatal conductance, transpiration, and nocturnal respiratory rate were increased. Furthermore, application of pyraclostrobin increased stalk yield and the green biomass index in the RB855156 and RB86751 sugarcane cultivars. In certain cultivars of sugarcane, application of pyraclostrobin leads to an increased yield.

scholarly journals Agronomic characteristics of common bean and castor bean hybrids in intercropping and monocropping

2018 ◽  
Vol 22 (3) ◽  
pp. 200-205 ◽  
Author(s):  
Cristiane F. Lisboa ◽  
Deyner D. A. Silva ◽  
Itamar R. Teixeira ◽  
Alessandro G. da Silva ◽  
José H. Mota
Keyword(s):  
Common Bean ◽  
Plant Height ◽  
Castor Bean ◽  
Block Design ◽  
Climatic Conditions ◽  
Common Beans ◽  
Agronomic Characteristics ◽  
Randomized Block Design

ABSTRACT Common bean has great importance in the Brazilian economy and castor bean is still emerging in Midwestern Brazil, but with great potential of exploitation by farmers due to the prevailing climatic conditions and flat topography. Hence, this study aimed to evaluate the agronomic characteristics of common bean cultivars and castor bean hybrids in intercropping and monocropping under the edaphoclimatic conditions of the Cerrado region. The randomized block design was used in 4 x 2 + 6 factorial scheme, with three replicates. Treatments were composed of four cultivars of common beans (BRS Pérola, BRS Esteio, BRSMG Realce and BRS Pitanga) intercropped with two castor bean hybrids (Tamar and Ag Ima), plus the respective crops in monocropping. In common bean cultivars, plant height was influenced in the intercropping with castor bean hybrids; however, agronomic characteristics of the castor bean hybrids were not influenced by common bean cultivars. The intercropping between common bean cultivars (BRS Esteio, BRSMG Realce and BRS Pitanga) and castor bean hybrids (Tamar and Ag Ima) was classified as viable by the area equivalence index, since this index presented values greater than 1.0 for the intercropping between these cultivars. This fact indicates that it would take more than one hectare in monocropping to produce the same amount than one hectare in intercropping.

The zinc finger transcription factor ATF1 regulates aluminum tolerance in barley

2020 ◽  
Vol 71 (20) ◽  
pp. 6512-6523
Author(s):  
Liyuan Wu ◽  
Yiyi Guo ◽  
Shengguan Cai ◽  
Liuhui Kuang ◽  
Qiufang Shen ◽  
...  
Keyword(s):  
Transcription Factor ◽  
Transcriptional Activation ◽  
Crop Production ◽  
Molecular Mechanisms ◽  
Aluminum Tolerance ◽  
Acid Soils ◽  
Al Tolerance ◽  
Al Stress ◽  
Transcription Factor 1 ◽  
Differently Expressed Genes

Abstract Aluminum (Al) toxicity is a major abiotic stress that restricts crop production in acid soils. Plants have evolved internal and external mechanisms of tolerance, and among them it is well known that AtSTOP1 and OsART1 are key transcription factors involved in tolerance through regulation of multiple downstream genes. Here, we identified the closest homolog of these two proteins in barley, namely HvATF1, Al-tolerance Transcription Factor 1, and determined its potential function in Al stress. HvATF1 is expressed in the nucleus, and functions in transcriptional activation. The transcription of HvATF1 was found to be constitutive in different tissues, and was little affected by Al stress. Knockdown of HvATF1 by RNAi resulted in increased Al sensitivity. Transcriptomics analysis identified 64 differently expressed genes in the RNAi lines compared to the wild-type, and these were considered as candidate downstream genes regulated by HvATF1. This study provides insights into the different molecular mechanisms of Al tolerance in barley and other plants.

scholarly journals Fusarium oxysporum f. sp. phaseoli and Meloidogyne incognita interaction in common bean

2010 ◽  
Vol 10 (3) ◽  
pp. 271-274 ◽  
Author(s):  
Flávia Fernandes Carneiro ◽  
Magno Antonio Patto Ramalho ◽  
Mônica Juliani Zavaglia Pereira
Keyword(s):  
Common Bean ◽  
Fusarium Oxysporum ◽  
Meloidogyne Incognita ◽  
Tomato Plant ◽  
Block Design ◽  
Egg Mass ◽  
One Pot ◽  
Randomized Block Design ◽  
Bean Plants ◽  
Susceptible Tomato

To verify a possible relationship between resistance to nematodes and to Fusarium oxysporum (Fop) in common bean, 18 lines (eight resistant and eight susceptible to Fop plus two controls) were evaluated for resistance to the nematode Meloidogyne incognita. This evaluation was conducted in a greenhouse in a randomized block design with five replications. The plot consisted of one pot with two bean plants and a nematode-susceptible tomato plant. Two weeks after sowing, plants were infested in the rhizosphere with 5000 eggs of Meloidogyne incognita, race 3. The number of egg masses was assessed, about 45 days after inoculation. Only lines ESAL 522, ESAL 519 and 'Aporé' were resistant to the nematode. Only 'Aporé' was resistant to both pathogens. The correlation between grades of Fop severity and mean egg mass was practically zero (r = 0.0252, P < 0.9293).

scholarly journals VIABILIDADE TÉCNICA DA PRODUÇÃO DE PEPINO JAPONÊS SUBMETIDO A DIFERENTES LÂMINAS DE IRRIGAÇÃO

Irriga ◽  
2018 ◽  
Vol 23 (3) ◽  
pp. 535-547
Author(s):  
Thayana Cristina de Andrade Rodrigues ◽  
JOAQUIM ALVES DE LIMA JUNIOR ◽  
Rodrigo Otávio Rodrigues Melo Souza ◽  
Cândido F De Oliveira Neto ◽  
Ivan Carlos F Martins
Keyword(s):  
Cucumis Sativus ◽  
Drip Irrigation ◽  
Block Design ◽  
Terra Firme ◽  
Cucumis Sativus L ◽  
Randomized Block Design ◽  
Use Efficiency ◽  
E Mail ◽  
Adequate Management

VIABILIDADE TÉCNICA DA PRODUÇÃO DE PEPINO JAPONÊS SUBMETIDO A DIFERENTES LÂMINAS DE IRRIGAÇÃO     THAYANA CRISTINA DE ANDRADE RODRIGUES1; JOAQUIM ALVES DE LIMA JUNIOR2; RODRIGO OTÁVIO RODRIGUES DE MELO SOUZA3; CANDIDO FERREIRA DE OLIVEIRA NETO4 E IVAN CARLOS FERNANDES MARTINS5   1Engª Agrônoma, Mestre em Agronomia, Universidade Federal Rural da Amazônia – UFRA, Instituto de Ciências Agrárias, Av. Pres. Tancredo Neves nº 2501, Terra Firme, CEP:66077-830, Belém-PA, Brasil, E-mail: [email protected]. 2Professor Adjunto, Universidade Federal Rural da Amazônia, campus Capanema, Rua João Pessoa nº 121, Centro, CEP:68700-030, Capanema-PA, Brasil, E-mail: [email protected]. 3Professor Associado, Instituto de Ciências Agrárias, Universidade Federal Rural da Amazônia, Av. Pres. Tancredo Neves nº 2501, Terra Firme, CEP:66077-830, Belém-PA, Brasil, E-mail: [email protected]. 4Professor Associado, Instituto de Ciências Agrárias, Universidade Federal Rural da Amazônia, Av. Pres. Tancredo Neves nº 2501, Terra Firme, CEP:66077-830, Belém-PA, Brasil, E-mail: [email protected]. 5Professor Adjunto, Universidade Federal Rural da Amazônia, campus Capanema, Rua João Pessoa nº 121, Centro, CEP:68700-030, Capanema-PA, Brasil, E-mail: [email protected].     1 RESUMO   A deficiência hídrica é normalmente o fator que mais limita a produtividade e qualidade de hortaliças. Neste cenário, a irrigação surge como um importante fator de produção, além de promotor da máxima produtividade e da qualidade do produto. O objetivo deste trabalho foi identificar um manejo adequado da irrigação por gotejamento, com minitanque evaporimétrico, para o desenvolvimento e produção do pepino japonês em ambiente protegido. O ensaio foi realizado na Fazenda Experimental da Universidade Federal Rural da Amazônia, município de Igarapé – Açu/PA. Utilizou-se o delineamento em blocos casualizados com cinco tratamentos e quatro repetições, aplicando-se lâminas de 30, 60, 90,120 e 150% baseadas na evaporação do minitanque. Observou-se que de modo geral, tanto a deficiência quanto o excesso hídrico afetaram negativamente as variáveis analisadas. Os melhores índices de produtividade e crescimento foram encontrados nas lâminas de 90 e 120% da ECA e a maior eficiência do uso da água, obtida com as menores lâminas de irrigação, sendo o valor máximo, de 2842,53 kg ha-1 mm-1, encontrado no tratamento com 30 % da ECA.   Palavras-chave: Cucumis sativus L.; evaporação; gotejamento; manejo de água.     RODRIGUES, T.C.A.; LIMA JÚNIOR, J.A.; DE MELO SOUZA, R.O.R.; OLIVEIRA NETO, C. F.; MARTINS, I.C.F. TECHNICAL FEASIBILITY OF JAPANESE CUCUMBER PRODUCTION SUBMITTED TO DIFFERENT IRRIGATION BLADES     2 ABSTRACT   Water deficiency is usually the factor that most limits the productivity and quality of vegetables. In this scenario, irrigation appears as an important factor of production, besides promoting the maximum productivity and product quality. The objective of this work was to identify an adequate management of drip irrigation, with reduced pan, for the development and production of japanese cucumber in a protected environment. The experiment was carried out at the Experimental Farm of the Rural Federal University of Amazônia, county of Igarapé - Açu - PA. A randomized block design with five treatments and four replicates was used, with slides of 30, 60, 90, 120 and 150% based on the evaporation of a modified pan. It was observed that, in general, both the deficiency and the water excess negatively affected the analyzed variables. The best productivity and growth indexes were found in the 90% and 120% ECA slides and the highest water use efficiency obtained with the lowest irrigation depths. The maximum value was 2842.53 kg ha-1 mm- 1, found in the treatment with 30% ECA.   Keywords: Cucumis sativus L.; drip irrigation; evaporation; water management

scholarly journals TROCAS GASOSAS, PIGMENTOS CLOROPLASTÍDICOS E DANO CELULAR NA MAMONEIRA SOB DIFERENTES COMPOSIÇÕES CATIÔNICA DA ÁGUA

Irriga ◽  
2017 ◽  
Vol 22 (4) ◽  
pp. 757-774 ◽  
Author(s):  
Geovani Soares Lima ◽  
Hans Raj Gheyi ◽  
Reginaldo Gomes Nobre ◽  
Lauriane Almeida dos Soares ◽  
Pedro Dantas Fernandes ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Cell Membrane ◽  
Castor Bean ◽  
Block Design ◽  
Membrane Damage ◽  
Bean Plant ◽  
Control Treatment ◽  
Agricultural Activity ◽  
Chloroplast Pigments ◽  
Bean Plants

TROCAS GASOSAS, PIGMENTOS CLOROPLASTÍDICOS E DANO CELULAR NA MAMONEIRA SOB DIFERENTES COMPOSIÇÕES CATIÔNICA DA ÁGUA  GEOVANI SOARES LIMA1; HANS RAJ GHEYI2; REGINALDO GOMES NOBRE3; LAURIANE ALMEIDA DOS ANJOS SOARES4; PEDRO DANTAS FERNANDES5 E GUILHERME DE FREITAS FURTADO6 1Unidade Acadêmica de Engenharia Agrícola, Universidade Federal de Campina Grande, UFCG, Rua Aprígio Veloso, 882 -Universitário, Campina Grande, PB, [email protected] Núcleo de Engenharia de Água e Solo, Universidade Federal do Recôncavo da Bahia, UFRB, Rua Rui Barbosa,710 -Centro, Cruz das Almas, BA. [email protected] Acadêmica de Ciências Agrárias, Universidade Federal de Campina Grande, UFCG, Rua Jario Vieira Feitosa, 1770, Bairro dos Pereiros, Pombal, PB, [email protected] Acadêmica de Engenharia Agrícola, Universidade Federal de Campina Grande, UFCG, Rua Aprígio Veloso, 882 -Universitário, Campina Grande, PB, [email protected] Acadêmica de Engenharia Agrícola, Universidade Federal de Campina Grande, UFCG, Rua Aprígio Veloso, 882 -Universitário, Campina Grande, PB, [email protected] Acadêmica de Engenharia Agrícola, Universidade Federal de Campina Grande, UFCG, Rua Aprígio Veloso, 882 -Universitário, Campina Grande, PB, [email protected]  1 RESUMO Devido ao aumento na demanda de água tanto pela atividade agrícola quanto pelo abastecimento urbano e industrial e, considerando a escassez hídrica tanto quantitativa como qualitativamente, especialmente no semiárido do Nordeste Brasileiro, o uso de água salina na agricultura surge como alternativa para expansão das áreas irrigadas. Neste contexto, se avaliaram no presente estudo, as trocas gasosas, os pigmentos cloroplastídicos e o dano na membrana celular das plantas de mamoneira cv. BRS Energia, em função da irrigação com águas salinas de diferente natureza catiônica. O experimento foi desenvolvido em lisímetros de drenagem em condições de casa de vegetação, usando Argissolo Acinzentado Eutrófico de textura franco-arenosa, no município de Campina Grande-PB. Foram estudadas seis combinações catiônica da água (Testemunha; Na+; Ca2+; Na++Ca2+; K+ e Na++Ca2++Mg2+), no delineamento em blocos casualizados com quatro repetições, sendo cada parcela composta por cinco plantas. No tratamento testemunha, as plantas foram irrigadas com água de condutividade elétrica de 0,6 dS m-1 enquanto se utilizou nos demais tratamentos CEa de 4,5 dS m-1, obtida a partir de diferentes cátions, todos em forma de cloreto. A variação na condutividade elétrica da água promove maior efeito deletério sobre as trocas gasosas, os pigmentos cloroplastídicos e o dano na membrana celular das plantas de mamoneira cv. BRS Energia, na fase de florescimento, em comparação com a natureza catiônica da água; o potássio foi o cátion que proporciona os maiores valores para a taxa de assimilação de CO2 e eficiência instantânea do uso da água; O maior percentual de dano na membrana celular na mamoneira foi obtido nas plantas irrigadas com água potássica. Palavras-chave: Ricinnus communis L., estresse salino, fisiologia.   LIMA, G. S. de.; GHEYI, H. R.; NOBRE, R. G.; SOARES, L. A. dos A.; FERNANDES, P. D.;FURTADO, G. de F.GAS EXCHANGES, CHLOROPLAST PIGMENTS AND CELL DAMAGE IN THE CASTOR BEAN PLANT UNDER DIFFERENT CATIONIC WATER COMPOSITIONS   2 ABSTRACT Due to the increase in water demand both for the agricultural activity and for urban as well as industrial supply and considering water scarcity both quantitatively and qualitatively, especially in semi-arid region of the Brazilian Northeast, the use of saline water in agriculture is an alternative for the expansion of irrigated areas. In this context, gaseous exchanges, chloroplast pigments and cell membrane damage in castor bean plants cv. BRS Energia, due to the irrigation with saline waters of a different cationic nature were evaluated. The experiment was carried out in drainage lysimeters under greenhouse conditions, using the Eutrophic Ultisol of sandy loam texture, in the city of Campina Grande, PB. Six cationic water combinations (Control, Na+, Ca2+, Na++ Ca2 +, K+ and Na++ Ca2++ Mg2+) were studied in the randomized block design with four replicates, each plot being composed of five plants. In the control treatment, the plants were irrigated with water of 0.6 dS m-1 electrical conductivity while in other treatments, ECw of 4.5 dS m-1, obtained from different cations, all in the form of chloride, were used. The variation in the electrical conductivity of the water promotes a greater deleterious effect on the gas exchange, chloroplast pigments and damage to the cell membrane of the castor bean plants cv. BRS Energia, in the flowering phase, compared to the cationic nature of water; potassium is the cation that provides the highest values for the CO2 assimilation rate and instantaneous efficiency of water use; the highest percentage of damage to the cell membrane of the castor bean plant is obtained in plants irrigated with water containing potassium. Keywords: Ricinnus communis L., salt stress, physiology.

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