Growth and Gas Exchange in Castor Bean Plants Under Saline Stress in Different Phenological Phases and Nitrogen Fertilization

ABSTRACT The excess of salts can affect several processes in the crops, and nitrogen (N) can attenuate the depressive effect of salinity. The objective was to evaluate the influence of nitrogen doses on the growth and gas exchange of corn crop irrigated with saline water. The experiment was conducted from June to September 2019 at the University of International Integration of Afro-Brazilian Lusophony, Redenção, CE, Brazil. The experimental design was completely randomized, in a 2 x 3 factorial scheme (supply water of 0.3 dS m-1 and saline solution of 3.0 dS m-1) and three nitrogen doses, 0, 80, and 160 kg ha-1, corresponding to 0, 50, and 100% of the recommended dose respectively, with six repetitions. At 30 and 45 days after sowing (DAS), plant height, leaf area, number of leaves, photosynthesis, transpiration, and stomatal conductance were evaluated. Saline stress affects plant height, leaf area, photosynthesis, transpiration, and conductance at 30 DAS. The doses of 80 and 160 kg ha-1 provide greater performance in plant height, leaf area, photosynthesis, transpiration, and conductance at 30 DAS. The use of low salinity water and doses of 80 and 160 kg ha-1 were more efficient in terms of plant height, leaf area, photosynthesis, transpiration, and conductance at 45 DAS. The dose of 160 kg ha-1 of N attenuates the harmful effects of salts in AG 1051 hybrid maize plants, providing higher values of photosynthesis, transpiration, and stomatal conductance at 45 DAS when irrigated with water of 3.0 dS m-1.

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First report ofRhizoctonia solaniAG 4 HG-II attacking castor bean plants (Ricinus communis) in Brazil and evaluation of two castor bean cultivars for resistance to damping-off

Australasian Plant Disease Notes ◽

10.1071/dn08048 ◽

2008 ◽

Vol 3 (1) ◽

pp. 121 ◽

Cited By ~ 1

Author(s):

M. A. Basseto ◽

H. A. Chagas ◽

D. D. Rosa ◽

M. D. Zanotto ◽

E. L. Furtado

Keyword(s):

Castor Bean ◽

Ricinus Communis ◽

Damping Off ◽

First Report ◽

Bean Plants

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CELL DAMAGE, WATER STATUS AND GAS EXCHANGES IN CASTOR BEAN AS AFFECTED BY CATIONIC COMPOSITION OF WATER

Revista Caatinga ◽

10.1590/1983-21252019v32n221rc ◽

2019 ◽

Vol 32 (2) ◽

pp. 482-492

Author(s):

GEOVANI SOARES DE LIMA ◽

HANS RAJ GHEYI ◽

REGINALDO GOMES NOBRE ◽

LAURIANE ALMEIDA DOS ANJOS SOARES ◽

JOÃO BATISTA DOS SANTOS

Keyword(s):

Salt Stress ◽

Irrigation Water ◽

Castor Bean ◽

Water Saturation ◽

Water Status ◽

Water Saturation Deficit ◽

Gas Exchanges ◽

Saturation Deficit ◽

Cationic Composition ◽

Bean Plants

ABSTRACT Castor bean is an oilseed crop which is able to adapt to various edaphoclimatic conditions and has considerable contents of oil in its seeds, with potential for use in the castor oil industry. In this context, this study aimed to evaluate changes in membrane damage, water status and gas exchanges in castor bean plants (cv. ‘BRS Energia’) in response to irrigation water salinity and cationic composition. Randomized blocks were used to test six cationic compositions (S1 - Control; S2 - Na+; S3 - Ca2+; S4 - Na+ + Ca2+; S5 - K+ and S6 - Na+ + Ca2+ + Mg2+), in four replicates. Plants in the control treatment were subjected to irrigation using water of low electrical conductivity (S1 - ECw = 0.6 dS m-1), whereas those in the other treatments were irrigated using 4.5 dS m-1 water prepared with different cations. Higher leaf succulence associated with lower water saturation deficit is an indication of tolerance to salt stress in castor bean plants irrigated with K+-rich water. The presence of Na+ in irrigation water caused the highest water saturation deficit in castor bean leaf blades. The lowest damage in cell membranes was observed in plants irrigated with Ca2+-rich water. The damaging effect of salt stress on castor bean gas exchanges depends on the cationic composition of water and occurred in the following order: Na+>Na++Ca2+>Ca2+> Na++Ca2++Mg2+>K+.

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Aluminum tolerance in castor bean lines1

Pesquisa Agropecuária Tropical ◽

10.1590/1983-40632018v4852425 ◽

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.

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PHYSIOLOGICAL AND SANITARY QUALITY AND OIL CONTENT OF CASTOR BEAN SEEDS UNDER DIFFERENT STORAGE CONDITIONS?

Revista Caatinga ◽

10.1590/1983-21252019v32n114rc ◽

2019 ◽

Vol 32 (1) ◽

pp. 131-142

Author(s):

Heloisa Oliveira dos Santos ◽

Maria Laene Moreira de Carvalho ◽

Camila Aparecida Lopes ◽

Édila Vilela de Resende Von Pinho ◽

Stefânia Vilas Boas Coelho

Keyword(s):

Castor Bean ◽

Oil Content ◽

Seed Quality ◽

Ricinus Communis ◽

Storage Condition ◽

Storage Conditions ◽

Ideal Condition ◽

Randomized Design ◽

Cold Room ◽

Bean Plants

ABSTRACT The objective of this work was to evaluate the effects of different storage conditions on the physiological and sanitary quality and oil content of castor bean (Ricinus communis) seeds. Seeds of castor bean plants of the Guarani, and IAC-80 cultivars were stored in two environments (cold room, and room conditions), using three package types (multifoliate Kraft paper bag, and polyethylene bag, and polyethylene bag with vacuum at 1 atm). In addition, another storage condition was evaluated: cryopreservation (-196 °C) in foil paper bags. Seed quality was evaluated before storage and at 4, 8, and 12 months after storage by testing their 7-day and 14-day germination, emergence, health, water content, and oil content. The experiment was conducted in a completely randomized design, with 7×4 factorial arrangement consisting of seven storage conditions and four evaluation times. Cryopreservation is the ideal condition for maintaining the seed physiological quality of the Ricinus communis cultivars used throughout storage. The oil content of the R. communis seeds decreases, and the incidence of Aspergillus spp. and Fusarium spp. fungi increases throughout storage, regardless of the storage conditions.

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Gas exchanges in sugar apple (Annona squamosa L.) subjected to salinity stress and nitrogen fertilization

Australian Journal of Crop Science ◽

10.21475/ajcs.19.13.12.p1754 ◽

2019 ◽

pp. 1959-1966

Author(s):

Francisco Romário Andrade Figueiredo ◽

Anderson Carlos de Melo Gonçalves ◽

João Everthon da Silva Ribeiro ◽

Toshik Iarley da Silva ◽

Jackson Silva Nóbrega ◽

...

Keyword(s):

Experimental Design ◽

Gas Exchange ◽

Chlorophyll Content ◽

Irrigation Water ◽

Nitrogen Fertilization ◽

Annona Squamosa ◽

Negative Effects ◽

Chlorophyll Content And Fluorescence ◽

Fluorescence Parameters ◽

Salinity Levels

Salinity is one of the modern agriculture major obstacles, causing several physiological disturbances in plants, adversely affecting its growth and development. Therefore, some techniques are required in order to alleviate the negative effects of salinity stress on plants, as for example an adequate nitrogen fertilization. The aim of this study was to assess the ecophysiological responses of sugar apple plants (Annona squamosa L.) submitted to different salinity levels and nitrogen fertilization doses. The experimental design was a randomized block in an incomplete factorial scheme, with five electrical conductivities of the irrigation water (ECw: 0.5, 1.01, 2.25, 3.49 and 4.0 dS m-1) and five nitrogen doses (0, 101, 350, 598.2 and 700 mg dm-3), with four replicates, generated from the Box Central Composite experimental design matrix. Through a daily course, it was observed variations in gas exchange, chlorophyll content and fluorescence parameters. The gas exchange, chlorophyll content and fluorescence parameters were measured on photosynthetically active leaves. There was significant interaction between the salinity levels (ECw) and nitrogen doses for the chlorophyll indexes. The electrical conductivity of the irrigation water caused significant negative effects on chlorophyll fluorescence. Therefore, it can be stated that the sugar apple plants ecophysiology varies through the day and that salinity affects its chlorophyll content and fluorescence.

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