scholarly journals Physiological potential of popcorn seeds submitted to water stress after treated with bioregulator

2019 ◽  
Vol 40 (2) ◽  
pp. 573 ◽  
Author(s):  
Bruno Ribeiro Ferreira ◽  
Carolina Chichanoski ◽  
Lia Mara Moterle ◽  
Renato Frederico dos Santos ◽  
Alessandro Lucca Braccini
Keyword(s):  
Water Stress ◽  
Osmotic Potential ◽  
Primary Root ◽  
Water Restriction ◽  
High Productivity ◽  
Randomized Design ◽  
Key Points ◽  
Crop Development ◽  
Completely Randomized Design ◽  
Primary Root Length

Seed performance is one of the key points for high productivity in crop development. The objective of this study was to evaluate the physiological potential of popcorn cultivar seeds (IAC 125 and BRS-Ângela) treated with Stimulate® bioregulator under water stress. Popcorn seeds were submitted to different osmotic potential levels 0; -0.1; -0.3; -0.6 and -0.9 MPa and induced by mannitol, after being treated with bioregulator at the dose of 1.5 L 100 kg-1 of seeds. The experiment was conducted in a completely randomized design, in a 5 × 2 × 2 factorial design (osmotic potential levels x cultivars x absence and presence of bioregulator). The variables evaluated were: first count and final count of germination standard, shoot length, primary root length, and dry biomass of seedlings. Treating popcorn seeds with bioregulator is inefficient in improving the physiological potential under normal conditions and little water restriction, but under conditions in which water may be limited, the use of bioregulator positively influences germination, growth, and initial performance of seedlings.

scholarly journals Effects of Aluminum and pH on Germination of Echium plantagineum L.

2020 ◽  
Vol 8 (1) ◽  
pp. 313
Author(s):  
Rodrigo Roso ◽  
Ubirajara Russi Nunes ◽  
Caren Alessandra Müller ◽  
Juçara Terezinha Paranhos ◽  
Sidinei José Lopes ◽  
...  
Keyword(s):  
Aerial Part ◽  
Aluminum Sulfate ◽  
Growth Parameters ◽  
Primary Root ◽  
Dry Mass ◽  
The Third ◽  
Sulfate Solutions ◽  
Randomized Design ◽  
Primary Root Length ◽  
Growth Of Seedlings

The objetive of this study was to identify the effects of aluminum concentrations and pH levels of solution on germination of Echium plantagineum L. seeds. Three different experiments were carried out in completely randomized design with four repetitions. In the first experiment, we used aluminum sulfate solutions in concentrations of 0.0; 0.3; 0.6; 1.0; 2.0; 3.0; 4.0; 5.0; 6.0 and 7.0 cmolc L-1 and in the second experiment, solutions with different pH, 3.0; 4.0; 5.0; 6.0; 7.0; 8.0; 9.0 and 10.0. In the third experiment, we carried out a factorial (4x4) with aluminum sulfate solutions (0.0; 2.0; 4.0 and 6.0 cmolc L-1) and pH (4.0; 5.0; 6.0 and 7.0). It was evaluated the germination of Echium plantagineum L. at four and 14 days after seeding (DAS), germination speed index, primary root length, aerial part and dry mass of seedlings. The presence of aluminum reduced the germination by 27 and 40% at four and 14 DAS, respectively, in concentrations superior to 3.0 cmolc L-1. The three growth parameters presented linear reduction with the increase of aluminum concentrations. In the second experiment, the solutions with pH of 3.0 and 10.0 provided increases in germination, length of root and aerial part, and little influence in the dry mass of seedlings. In the third experiment, there was significant interaction between the aluminum concentrations and pH levels of substrate. The presence of aluminum in the substrate presented toxic effect on germination of seeds, length of seedlings and dry mass. The pH of the solution has little effect in germination of seeds and in the growth of seedlings of E. plantagineum.

scholarly journals Physiological and antioxidant changes in sunflower seeds under water restriction

2020 ◽  
Vol 42 ◽  
Author(s):  
Thais de Castro Morais ◽  
Daniel Teixeira Pinheiro ◽  
Paola Andrea Hormaza Martinez ◽  
Fernando Luiz Finger ◽  
Denise Cunha Fernandes dos Santos Dias
Keyword(s):  
Antioxidant Enzymes ◽  
Primary Root ◽  
Field Performance ◽  
Seed Vigor ◽  
Sunflower Seeds ◽  
Water Restriction ◽  
Sod Activity ◽  
Initial Characterization ◽  
Lower Capacity ◽  
Primary Root Length

Abstract: Seed vigor may be determinant for field performance, especially under water restriction conditions. Sunflower is a crop subject to these conditions in the field and, therefore, the aim of this study was to evaluate the physiological and antioxidant changes in sunflower seeds under water restriction. Two lots of sunflower seeds (cv. Hélio 253) with different vigor levels were used. After initial characterization, seeds were placed to germinate under water potentials of 0.0, -0.2, -0.4, -0.6 and -0.8 MPa and evaluated by tests of germination, first germination count, shoot length and primary root length. The activities of the antioxidant enzymes SOD, CAT, POX and APX were also evaluated at 0, 2, 4 and 6 days after sowing. Water restriction led to a decrease in germination and slower seedling growth, regardless of seed vigor level. SOD activity was similar in the two lots, with reduction in activity four days after sowing. CAT activity was affected differently during germination in the two lots, and it was generally higher in the most vigorous lot. In higher vigor seeds, there was lower POX activity in water restriction treatments compared to the control. In general, seeds of lower vigor have lower capacity for activation of antioxidant enzymes, especially peroxidases.

scholarly journals Safflower genotypes submitted to soil density levels

2018 ◽  
Vol 9 (2) ◽  
pp. 142-153
Author(s):  
Edna Maria Bonfim-Silva ◽  
Juliana Tertezinha Sasso Paludo ◽  
Tonny José Araújo da Silva ◽  
William Fenner ◽  
Maurício Dutra Zanotto
Keyword(s):  
Soil Structure ◽  
Dry Mass ◽  
Carthamus Tinctorius ◽  
Soil Density ◽  
Randomized Design ◽  
Crop Development ◽  
Number Of Leaves ◽  
Agricultural Use ◽  
The Mean ◽  
Completely Randomized Design

It is essential to have knowledge of changes in soil structure, as a result of agricultural use and its relationship with crop development, especially those with potential for use in new regions, such as the cultivation of safflower (Carthamus tinctorius L.) in the Cerrado. In view of this dynamics, the objective was to evaluate the phytometric components of safflower genotypes submitted to levels of soil densities in Cerrado Oxisol. Ten safflower genotypes were then submitted to compaction (five densities: 1.0, 1, 2, 1.4, and 1.8 Mg m-3) in a completely randomized design with four replications under greenhouse conditions. The plots consisted of an overlap of three rings of polyvinylidene chloride of 0.01 m height each, and the treatments were applied in the intermediate layer. The phytometric components (plant height, number of leaves and stem diameter) and shoot dry mass of the crop were evaluated at 30, 60 and 90 days after sowing. There was no significant interaction between safflower genotypes and soil densities, with the effects being isolated for genotypes and/or densities when significant. For the phytometric characteristics evaluated, the genotypes PI250196, PI301049, PI305173, and PI305205 are more stable about the variations of soil density in comparison to the others. The phytometric components and dry mass of safflower shoot are impaired from the mean density of 1.2 Mg m-3.

scholarly journals EFEITO DA SALINIDADE NA GERMINAÇÃO E DESENVOLVIMENTO DE PLÂNTULAS DE Ochroma pyramidale

Nativa ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 239
Author(s):  
Viviane Da Silva da Cruz ◽  
Oscar Mitsuo Yamashita ◽  
Isane Vera Karsburg ◽  
Marco Antonio Camillo de Carvalho ◽  
Rivanildo Dallacort ◽  
...  
Keyword(s):  
Osmotic Potential ◽  
Inhibitory Effect ◽  
Saline Stress ◽  
Initial Development ◽  
Balsa Wood ◽  
Randomized Design ◽  
Total Inhibition ◽  
Completely Randomized Design ◽  
Osmotic Agents ◽  
Osmotic Potentials

No presente trabalho, foi avaliado o efeito da salinidade sobre a germinação de sementes e desenvolvimento pós-seminal de Ochroma pyramidale através de três agentes osmóticos (NaCl, CaCl2 e KCl), em dois experimentos. No primeiro, foi avaliado o estresse salino na germinação em esquema fatorial de 3 x 6, utilizando NaCl, CaCl2 e KCl, e seis potenciais osmóticos (0,0; -0,1; -0,2; -0,4; -0,6 e -0,8 MPa). No segundo experimento, estudou-se o crescimento inicial de plântulas, utilizando os mesmos agentes osmóticos, em quatro potenciais osmóticos (0,0; -0,1; -0,2 e -0,3 MPa), no delineamento inteiramente ao acaso esquema fatorial 3 x 4. O efeito da salinidade interferiu na germinação de sementes O. pyramidale, havendo redução à medida que os potenciais se tornaram mais negativos à produção de massa seca de plântula, percentual de germinação e velocidade do processo germinativo. No potencial osmótico de -0,8 MPa, ocorreu inibição total, evidenciando que o CaCl2 apresentou um efeito inibitório mais acentuado que o NaCl, seguido pelo KCl. No desenvolvimento de plantas, o NaCl provocou maior sensibilidade, comparando-se ao CaCl2 nos maiores potenciais osmóticos.Palavras-chave: Pau-de-balsa; germinabilidade; potencial osmótico; estresse salino. EFFECT OF SALINITY IN THE GERMINATION AND DEVELOPMENT OF Ochroma pyramidale SEEDLINGS ABSTRACT: In the present study, the effect of salinity on seed germination and post-seminal development of Ochroma pyramidale was evaluated through three osmotic agents (NaCl, CaCl2 and KCl) in two experiments. In the first experiment, salt stress in germination was evaluated in a factorial scheme 3 x 6, using NaCl, CaCl2 and KCl; and six osmotic potentials (0.0, -0.1, -0.2, -0.4, -0.6 and -0.8 MPa). In the second experiment, the initial development of plants, using the same osmotic agents, was studied in four osmotic potentials (0.0; -0.1; -0.2 and -0.3 MPa), in a completely randomized design 3 x 4 factorial scheme. The effect of salinity interfered on the germination of O. pyramidale seeds, with reduction as the potentials became more negative for the production of dry seedling mass, percentage of germination and germination speed. In the osmotic potential of -0.8 MPa, total inhibition occurred, evidencing that CaCl2 had a stronger inhibitory effect than NaCl, followed by KCl. In the development of plants, NaCl caused greater sensitivity when compared to CaCl2 in the highest osmotic potentials.Keywords: Pau-de-Balsa wood; germinability; osmotic potential; saline stress.

scholarly journals Water Restriction Affects Germination and Initial Sunflower Development

2020 ◽  
Vol 8 (3) ◽  
pp. 134
Author(s):  
Oscar Mitsuo Yamashita ◽  
Danillo De La Queyferr Goncalves ◽  
Marco Antonio Camillo de Carvalho ◽  
Rivanildo Dallacort ◽  
Ricardo Adriano Felito ◽  
...  
Keyword(s):  
Germination Rate ◽  
Dry Mass ◽  
Negative Influence ◽  
Critical Periods ◽  
Water Restriction ◽  
Initial Development ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
Paper Towels ◽  
Osmotic Potentials

Sunflower is a crop of great economic interest both nationally and internationally, due to its use especially in oil production. However, factors such as water restriction are commonly found in growing areas and exert a negative influence on the productive performance of the crop, especially in critical periods, such as the germination and initial development of the seedlings. Thus, the objective of this study was to evaluate the germinate behavior of seeds of sunflower cultivars as a function of lower osmotic potentials. The experiment was installed in a completely randomized design, in a 3x5 factorial scheme, three sunflower cultivars (Charrua, Nussol and Olisiun 4) and five osmotic potentials (0, -0.2, -0.4, -0.8, -1.2 MPa) with 3 replicates. For the study, solutions of polyethylene glycol (PEG 6000) were repaired. Rolls of paper towels were moistened with the concentrations and later kept in a germination chamber at 25 °C, where they remained for ten days. First counts (4th day) and total counts (10th day) were performed, and the germination rate (%) was verified. In addition, in the last evaluation, aerial and root length, green mass and dry mass of seedlings were determined. Based on the results obtained it can be verified that in osmotic potential higher than -0.8 MPa, no germination occurred. Nussol germinated more in more negative concentrations, with a germination rate of 90%, differing from the cultivars Charrua and Olisiun 4, which, in larger potentials, reached only 30% of germination.

scholarly journals Proline and trehalose in maize seeds germinating under low osmotic potentials

2016 ◽  
Vol 20 (1) ◽  
pp. 22-28 ◽  
Author(s):  
Rafaela J. B. Queiroz ◽  
Jairo O. Cazetta
Keyword(s):  
Osmotic Potential ◽  
Physiological Response ◽  
Physiological Mechanism ◽  
Proline Content ◽  
Embryo Axis ◽  
Water Limitation ◽  
Maize Seeds ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
Osmotic Potentials

ABSTRACT Although it is relatively well known that adult plants tend to accumulate proline and trehalose in their tissues as a physiological mechanism in response to drought, there is scarce information about the development of this physiological response in seeds. Thus, the objective of this research was to verify if maize seeds are able to develop mechanism of osmoprotection, when are germinating under low osmotic potential, and the possibility to use the levels of trehalose and proline in a defined seed part, aiming to differentiate genotypes regarding drought tolerance. The experiment was performed as a factorial arrangement of 2 x 5 (2 hybrids x 5 osmotic potential) within a completely randomized design, with four replicates. It was found that the proline content in the embryo axis of maize seeds germinating under water limitation is directly proportional to the intensity of this stress. Distinct hybrids show different proline levels accumulated in the embryo axis, when seeds are germinating under the same conditions of water limitation. The trehalose content tends to decrease in the embryo axis and in the endosperm of maize seeds germinating under increasing water limitation, but the reduction is not directly proportional to osmotic potential.

scholarly journals Performance, heat tolerance response, and blood metabolites of water-restricted Xhosa goats supplemented with vitamin C1

2020 ◽  
Vol 4 (2) ◽  
pp. 1113-1127
Author(s):  
Oluwakamisi F Akinmoladun ◽  
Fabian N Fon ◽  
Conference T Mpendulo ◽  
Omobola Okoh
Keyword(s):  
Water Stress ◽  
Heat Tolerance ◽  
Small Ruminants ◽  
Density Lipoprotein ◽  
Blood Metabolites ◽  
Average Weight ◽  
Water Restriction ◽  
Randomized Design ◽  
Tolerance Response ◽  
Ad Libitum

Abstract Water restriction in small ruminants is usually accompanied by a drop in feed intake, body weight, and disturbances in the normal internal milieu. However, attempts to lessen the burden of water stress with vitamin C (VC) supplementation have been greeted with conflicting reports. Therefore, this experiment was conducted to evaluate the effect of single and/or multiple VC supplementations in water-restricted Xhosa goats by evaluating their performance, heat tolerance, and blood metabolites. In total, 42 does, 12 mo old and with an average weight of 15.92 ± 2.12 kg were evaluated for 75 d. The does were distributed according to a complete randomized design into seven groups of six comparable animals: W0, without water restriction (control); W70, water restriction of 70% of ad libitum water intake (WI); W50, water restriction of 50% ad libitum WI; W70+, water restriction of 70% of ad libitum WI plus 3 g VC daily; W50+, water restriction 50% of ad libitum WI plus 3 g VC daily; W70++, water restriction of 70% of ad libitum WI plus 3 g VC and extra 5 g VC given every eighth day; and W50++, water restriction of 50% of ad libitum WI plus 3 g VC and extra 5 g VC given every eighth day. Goats under the W50 group were the most affected (P < 0.05) and the effect was more pronounced in their body condition scores (BCs). Weight loss due to water restriction was reduced by VC supplementation in treated groups. Changes in body thermal gradient, rectal temperature, cholesterol, and bilirubin were similar (P > 0.05) across the various experimental groups. The attenuation effect of VC was significant (P < 0.05) in responses to respiratory rate, Na+, K+, Mg2+, Cl−, Ca2+, and urea. Supplementation of VC (either single or multiple) did not significantly (P > 0.05) improve the effect of water restriction on BCs, FAMACHA, glucose, globulin, alanine aminotransferase, and high-density lipoprotein. The additive effect of multiple VC significantly influenced (P < 0.05) Na+ and Mg2+. Limited WI affects growth and other physiological parameters in Xhosa goats. However, supplementation of VC may be beneficial at modulating the stressful stimuli imposed by water stress.

scholarly journals Germination and initial development of Simira gardneriana seedling under water stress and at different temperatures

2017 ◽  
Vol 21 (5) ◽  
pp. 333-338 ◽  
Author(s):  
Fabrícia N. de Oliveira ◽  
Jessica R. de Oliveira ◽  
Salvador B. Torres ◽  
Rômulo M. O. de Freitas ◽  
Narjara W. Nogueira
Keyword(s):  
Water Stress ◽  
Water Availability ◽  
Dry Weight ◽  
Germination Percentage ◽  
Initial Development ◽  
Randomized Design ◽  
Seedling Length ◽  
Germination Speed ◽  
Different Temperatures ◽  
Completely Randomized Design

ABSTRACT The germination of seeds is affected by many factors, including water availability and temperature. This study aimed to evaluate the effects of water stress and different temperatures on germination and initial development of S. gardneriana M. R. Barbosa & Peixoto seedlings. The experiment was carried out in a completely randomized design, in a 7 x 4 factorial scheme, with seven potentials (0; -0.1; -0.2; -0.3; -0.4; -0.5 and - 0.6 MPa) and four temperatures (25, 30, 35 and 20-30 °C), with four replicates of 25 seeds. The analyzed variables were germination, percentage of normal seedlings, germination speed index, seedling length (shoot and root) and dry weight (shoot and root). There is a decrease in the germination and vigor of the seeds as the water potential decreases, being less affected under the temperature of 25 °C and very accelerated at 35 °C. The tolerance of S. gardneriana seed germination to water stress is variable between the temperatures and limiting to the formation of normal seedlings from the potential -0.5 MPa at temperatures of 25 to 30 °C and -0.4 and -0.2 MPa for 20-30 and 35 °C, respectively.

scholarly journals Growth Giant Prawns (Macrobracium Rosenbergii) With Different Stock Densities On The Minapadi System

2021 ◽  
Vol 2 (5) ◽  
pp. 1560-1565
Author(s):  
Mahendra Mahendra ◽  
Farah Diana ◽  
Dini Islama ◽  
Citra Dina Febrina
Keyword(s):  
Stocking Density ◽  
Rice Fields ◽  
High Productivity ◽  
Rice Productivity ◽  
Rice Plants ◽  
Average Value ◽  
Randomized Design ◽  
Rice Yields ◽  
Completely Randomized Design

Minapadi is a fish rearing system in rice fields that is carried out with rice plants. This study aims to increase the income of farmers with high productivity of rice yields and increase the production of giant prawns. The method used is a Completely Randomized Design (CRD) experiment with 3 treatments and 3 replications. The treatments were: P1 = stocking density of 100 birds/plot, P2 = stocking density of 200 birds/plot, P3 = stocking density of 300 birds/plot. This research was conducted for 90 days. Parameters observed were rice productivity and growth. The results showed that the best treatment was P2 = stocking density of 200 birds/plot. by producing an average value of rice productivity of 5 kg/50 m2 and an average value of growth of giant prawns of 4.72%.    

scholarly journals IDENTIFICAÇÃO DE GENÓTIPOS DE FEIJÃO-CAUPI TOLERANTES E SUSCETÍVEIS AO DÉFICIT HÍDRICO

Nativa ◽  
2018 ◽  
Vol 6 (6) ◽  
pp. 608
Author(s):  
Eveline Nogueira Lima ◽  
Kátia Regina Alves Pires ◽  
Elaine Facco Celin ◽  
Cândida Hermínia Campos de Magalhães Bertini ◽  
Rosilene Oliveira Mesquita
Keyword(s):  
Polyethylene Glycol ◽  
Water Stress ◽  
Water Deficit ◽  
Vigna Unguiculata ◽  
The Other ◽  
Distilled Water ◽  
Water Deficiency ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
Selection Of

Objetivou-se com esse trabalho identificar genótipos de feijão-caupi tolerantes e suscetíveis ao déficit hídrico, utilizando-se duas metodologias, estresse hídrico simulado com o uso de PEG6000 (Polietilenoglicol) e Screening Box. Os experimentos foram conduzidos em casa de vegetação no delineamento inteiramente casualizado com três repetições. Para a metodologia com PEG6000 foram utilizados 15 genótipos e duas testemunhas, com três repetições, totalizando 90 amostras. Foram selecionadas seis plântulas por genótipo, utilizaram-se três caixas contendo apenas água destilada e outras três com nível de potencial osmótico de - 0,2 MPa de PEG6000. A avaliação foi feita até atingir o ponto máximo de crescimento das raízes. Para a metodologia de Screening Box foram utilizados 15 genótipos, onde estes foram avaliados quanto à tolerância ao déficit hídrico no estádio de plântula. As duas metodologias mostraram-se eficientes na seleção de genótipos de feijão-caupi, os genótipos Santo Inácio Vermelho e BRS Tumucumaque, foram os mais sensíveis à seca, em ambas as metodologias.Palavras-chave: Vigna unguiculata, seca, plântulas. COWPEA GENOTYPES TOLERANT AND SUSCEPTIBLE TO WATER DEFICIT ABSTRACT: Objective to identify tolerant and susceptible cowpeas genotypes to water deficiency at the seedlings stage of growth, using two methodologies such as (a) water stress with the use of PEG6000 (Polyethylene glycol) and the Screening Box were used in the present research. The experiments were conducted in greenhouse environments using a completely randomized design with three replications. For the PEG6000 approach, 15 genotypes and two controls treatments were used in three replications in a total of 90 samples. Six seedlings were selected per genotype by using three boxes containing only distilled water. In the other treatment, three level of osmotic potential of -0.2 MPa of PEG6000. The evaluations of the trials were done until the Screening Box approach, 15 genotypes were used and were evaluated for tolerance to water deficit at the seedling stage of growth. The two methodologies were efficient in the selection of cowpea genotypes, the genotypes Santo InácioVermelho and BRS Tumucumaque were the most sensitive to drought in both methodologies.Keywords: drought, Vigna unguiculata, seedlings.

Sign in / Sign up

Export Citation Format

Share Document