scholarly journals SUBSTRATES AND TEMPERATURES FOR THE GERMINATION OF SEEDS OF Senegalia tenuifolia (L.) BRITTON & ROSE

2016 ◽  
Vol 29 (1) ◽  
pp. 113-118 ◽  
Author(s):  
ALCIMONE MARIA SILVA ARAÚJO2 ◽  
LIZ CAROLINA DA SILVA LAGOS CORTES ASSIS2 ◽  
NARJARA WALESSA NOGUEIRA ◽  
RÔMULO MAGNO OLIVEIRA DE FREITAS ◽  
SALVADOR BARROS TORRES
Keyword(s):  
Significant Interaction ◽  
Dry Mass ◽  
Shoot Length ◽  
Forest Species ◽  
Germination Test ◽  
Tukey Test ◽  
Seed Analysis ◽  
Germination Speed ◽  
Two Factors ◽  
Different Temperatures

ABSTRACT: The Rules for Seed Analysis and the Instructions for Seed Analysis of Forest Species have no recommendations for conducting the S. tenuifolia germination test. Therefore, the aim of the present study was to evaluate different temperatures and substrates to perform the germination test of S. tenuifolia seeds. The experimental design was completely randomized in a factorial 4 × 3 design and consisted of four substrates (paper roll; on paper; on sand and on vermiculite) and three temperatures (25, 30 and 35 °C), with four replicates of 25 seeds. The percentage of normal seedlings, the germination speed index, the shoot length, root length and dry mass of seedlings were evaluated. The Tukey test was used at 5% probability. There was a significant interaction between the temperatures and substrates tested for all variables, indicating that there is at least one ideal combination of the two factors that can increase the germination of seeds. The germination and vigor of S. tenuifolia seeds are influenced by the temperature and by the substrate used in the germination test. The combination of the paper roll substrates with a temperature of 25 and 30 °C was suitable for the germination of S. tenuifolia seeds.

scholarly journals Germination and vigor of Caesalpinia pulcherrima (L.) Sw. seeds under different light and temperature conditions

2018 ◽  
Vol 48 (8) ◽  
Author(s):  
Magnólia Martins Alves ◽  
Edna Ursulino Alves ◽  
Luciana Rodrigues de Araújo ◽  
Maria de Lourdes dos Santos Lima ◽  
Marina Matias Ursulino
Keyword(s):  
Experimental Design ◽  
Central America ◽  
White Light ◽  
Dry Mass ◽  
Light Regime ◽  
Shoot Length ◽  
Light Regimes ◽  
Seed Analysis ◽  
Germination Speed ◽  
Living Fence

ABSTRACT: Caesalpinia pulcherrima is a Fabaceae family species from Central America, which has a small size and is widely used as a living fence in the urban afforestation for streets, parks, and gardens. Based on this importance, the aim of this research was to study the influence of light and temperature on the germination of C. pulcherrima seeds. The study was carried out at the Laboratory of Seed Analysis of the Center of Agricultural Sciences of the Universidade Federal da Paraíba, Areia, PB, Brazil. The experimental design was completely randomized, comprising a 3x5 (three temperatures and five light regimes) factorial scheme with four replicates containing 25 seeds each. Germination and vigor of seeds were evaluated under temperatures of 25°C and 30ºC constant and 20-30ºC alternated in different light regimes: white, green, red-distant, red, and absence of light. Variables analyzed were: germination, first germination count, germination speed index, root length, shoot length, and the ratio of dry mass of root/shoot of the seedlings. Seeds of C. pulcherrima germinate in the presence and absence of light, being a neutral photoblastic. Recommendation to test the vigor of these seeds is the temperature of 30°C in the white light regime.

Initial development of millet with use of biostimulant under different temperatures

2020 ◽  
Vol 13 (2) ◽  
pp. 20
Author(s):  
P. R. Diesel ◽  
V. N. Silva
Keyword(s):  
Thermal Stress ◽  
Low Temperature ◽  
Seed Treatment ◽  
Stress Condition ◽  
Dry Mass ◽  
Negative Effects ◽  
Germination Test ◽  
Initial Development ◽  
Germination Speed ◽  
Different Temperatures

Millet is an important summer grass used as forage grass due to good bromatological characteristics and easy adaptation to Brazilian environmental conditions. However, when sowing the crop early in the southern region, situations may occur where low temperatures affect germination and seedling development. Thus, the present work had the objective of evaluating the germination and initial development of millet using Biozyme TF® biostimulant as a way to attenuate the effects of different temperatures. The experimental design was completely randomized, in a factorial scheme 3 x 5 (temperatures x doses) with four replicates each. The temperatures used were 15 °C, 20 °C and 25 °C and the doses used were: 0 (control); 0.25; 0.5; 0.75 and 1 ml kg-1. After the treatment, the seeds were evaluated by: germination test, germination speed index, shoot and root length and seedling dry mass. The data obtained were submitted to analysis of variance with Sisvar® software and, when found significant, the regression analysis was performed. The germination of millet seeds is favored, under low temperature stress conditions, with seed treatment at the dose of 0.50 ml kg-1 of biostimulant. The biostimulant does not influence millet germination speed index. Under low temperature thermal stress the biostimulant minimally increases the length and dry mass accumulation of millet seedlings and attenuates the negative effects on root growth. The accumulation of dry mass of the roots decreased with increasing dose of the biostimulant under thermal stress condition.

scholarly journals Physiological Performance of White Oat Seeds Treated with Phosphite-based Products

2020 ◽  
pp. 1-8
Author(s):  
Daisy Leticia Ramirez Monzon ◽  
Iara Maiqueli Stern Lemke ◽  
Lider Ayala ◽  
Maria Johana Gonzalez Vera ◽  
Geri Eduardo Menegelho
Keyword(s):  
Seed Treatment ◽  
Accelerated Aging ◽  
Dry Mass ◽  
Shoot Length ◽  
Commercial Products ◽  
Physiological Performance ◽  
Accelerated Aging Test ◽  
Seed Analysis ◽  
Oat Seeds ◽  
Resistance Inducers

Aims: White oats are considered one of the most important cereals in the world. Currently, fertilizers based on phosphorus and silicon are being studied as inductors of resistance in the treatment of seeds, since they have as advantages such as low costs and excellent absorption by plants. The effects of seed treatment with phosphite resistance inducers are still unknown, being necessary the study in relation to interact with the seed at the time of twinning.  Study Design: The experimental design used was completely randomized, with four replications, two commercial products based on phosphite FullTec Mais and Ultra Plus and five doses.  Place and Duration of Study: The work was conducted at the Didactic Laboratory of Seed Analysis of the Faculty of Agronomy Eliseu Maciel of the Federal University of Pelotas (UFPel), Pelotas-RS, in 2019. Methodology: White oat seeds were used, produced in the 2018/2019 agricultural kharif and treated with commercial products based on FullTec Mais and Ultra Plus phosphites, in five doses: 0; 1.0; 2.0; 3.0; 4.5 mL for each 100 kg of seeds. The variables evaluated were first germination count (CP), germination (G), shoot length (CA), root length (CR), total length (CT), accelerated aging (EV) and total dry mass (MST). The data expressed as a percentage were subjected to analysis of variance to verify the effect of treatments. Then, the Duncan means test (P=0.5) was performed, for the discrimination between the treatment means. Statistical analyzes were performed using the R Core Team (2020). Results: The results showed that the FullTec Mais product stimulates the physiological performance of white oat seeds for the variables first germination count (CP), germination (G) and shoot length (CA), with a dose of 2 mL of the product per 100 kg of seeds that showed the highest expression. For the Ultra Plus product at a dose of 1 mL of the product per 100 kg of seeds it is more efficient in the accelerated aging test (EV), for the other variables it did not show significant differences. Conclusion: It is possible to use phosphite-based micronutrients in seed treatment, without causing physiological damage to the seed during the twinning process.

scholarly journals Bean seed performance under different temperatures

2020 ◽  
Vol 8 (1) ◽  
pp. 012-016
Author(s):  
Mártin Zanchett Groth ◽  
Rodrigo Ferraz Ramos ◽  
Cristiano Bellé ◽  
Débora Leitzke Betemps ◽  
Nariane De Andrade ◽  
...  
Keyword(s):  
Phenotypic Plasticity ◽  
Local Adaptation ◽  
Temperature Increase ◽  
Biomass Accumulation ◽  
Dry Mass ◽  
Southern Brazil ◽  
Bean Seed ◽  
Dry Biomass ◽  
Germination Speed ◽  
Different Temperatures

The study evaluated the germination performance of bean seeds (BRS Expedito) from different regions of southern Brazil submitted to different germination temperatures (20, 25 and 30º C). Were evaluated to germination (GER), first germination count (PCG), germination speed index (IVG), shoot dry mass (MSPA) and root dry mass (MSR). The seeds from São Mateus (PR) presented the highest average values for the variables GER, PCG and IVG in the three temperatures tested. The temperature increase (20 to 30 ºC) significantly influenced the dry biomass accumulation in the shoots and seedlings roots. The results indicate the existence of a phenotypic plasticity acquired by the cultivar due to local adaptation of the ecotypes.

scholarly journals Analysis of seed vigor and germination of Toona ciliata M. Roem. var. australis

2018 ◽  
Vol 40 (4) ◽  
pp. 388-395
Author(s):  
Júlio Rieger Lucchese ◽  
Marília Lazarotto ◽  
Claudimar Sidnei Fior ◽  
Larissa Campos de Sá ◽  
Carolina Brito Brose
Keyword(s):  
Electrical Conductivity ◽  
Deionized Water ◽  
Seed Vigor ◽  
Basic Information ◽  
Forest Species ◽  
Germination Test ◽  
Seed Analysis ◽  
Evaluation Test ◽  
Toona Ciliata

Abstract: Seed analysis tests should be performed under standard conditions for each species, so that the results can be reproducible anywhere. Seeds of the forest species Toona ciliata var. australis have been commercialized in Brazil despite no standard conditions for their analysis have been published. The objective was to determine basic information about temperature and photoperiod for the germination test and the imbibition time and volume of water for electrical conductivity. In the germination test the seeds were incubated at 15, 20, 25 and 30 °C with 0, 12 and 16 h of light. The electrical conductivity was evaluated up to 108 h after immersion of the seeds in 50 and 100 mL of deionized water. The conditions of 25 °C and 16 h of light provided higher amount of normal seedlings. At 15 °C all seeds remained hard regardless the photoperiod used, however, it became absent when light was added at higher temperatures. The electrical conductivity test should be performed with a volume of 50 mL and evaluated after 24 h of imbibition. It also showed a stronger correlation between normal seedlings, being a promising vigor evaluation test for this species.

scholarly journals Storage of Soybean Seeds and Addition of Insecticide and Micronutrients

2018 ◽  
Vol 11 (1) ◽  
pp. 553
Author(s):  
Gustavo H. Demari ◽  
Vinícius J. Szareski ◽  
Ivan R. Carvalho ◽  
Tuane A. da Silva ◽  
Vânia M. Gehling ◽  
...  
Keyword(s):  
Significant Interaction ◽  
Seed Treatment ◽  
Primary Root ◽  
Dry Mass ◽  
Shoot Length ◽  
Soybean Seeds ◽  
Seed Treatments ◽  
Storage Times ◽  
And Storage ◽  
Primary Root Length

The objective of this work was to evaluate the effects on the physiological attributes of soybean seeds submitted to the seed treatment with addition of insecticide, polymers and micronutrients throughout the storage. The experimental design was completely randomized in a factorial scheme, with four seed treatments per two seasons of storage of the seeds. The analysis of variance revealed a significant interaction among seed treatments and storage times for both cultivars at 5% of probability, referring to the characteristics of shoot length (SL), primary root length (RL), shoot dry mass (SDM) and dry mass of the primary root (RDM) for the cultivar Fundacep 37 RR. Addition of seed treatments influences the physiological performance of seedlings originated from soybean seeds stored for 240 days. The shoot and primary root lenghts, and shoot dry mass express the isoenzyme esterase through the aerial part and primary root of the seedling, the malate dehydrogenase is expressed in the primary root while in the peroxidase it is evident in the shoot of the seedlings.

scholarly journals Massal and Individual Electrical Conductivity Tests and its Relationships with the Physiological Quality of Sweet Sorghum Seeds

2020 ◽  
Vol 8 (2) ◽  
pp. 407
Author(s):  
Joner Silveira Dalcin ◽  
Caren Alessandra Müller ◽  
Ubirajara Russi Nunes ◽  
Rodrigo Roso ◽  
Alberto Cargnelutti Filho ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Cold Test ◽  
Dry Mass ◽  
Shoot Length ◽  
Tukey Test ◽  
Physiological Quality ◽  
Rapid Tests ◽  
The Individual ◽  
The Relationship

Rapid tests such as electrical conductivity provide fast and consistent results regarding stratification of seed lots by vigor. They are important tools used to evaluate the physiological quality of seeds of several species, however, no such information was found for Sorghum bicolor. The objective of this study was to evaluate the relationship between the physiological quality of the seeds by the mass and individual conductivity tests. Four plots of the Fepagro 19 cultivar were analyzed through the degree of moisture, weight of one thousand seeds, first count and germination, radicular and shoot length, dry mass, cold test and emergence of field seedlings. Subsequently, they were submitted to mass electrical conductivity experiments with variations in the imbibition time (2, 4, 6, 8, 12 and 24 hours), temperature (20, 25 and 30 ºC), number of seeds (25 and 50), volume of water (50 and 75 mL) and individual (2, 4, 6, 8, 12 and 24 hours). The design was completely randomized and the data evaluated by the Tukey test. Only the lowest physiological quality batch was detected in the 20 °C, 75 mL and 25 seeds for 12 hours combinations; the individual test detected the least physiological quality batch, and it was possible to perform it in 24 hours.

Allelopathy of the Melia azedarach L. Leaf Extract on the Germination of Three Selected Atlantic Forest Species

2019 ◽  
pp. 1-7
Author(s):  
Magnólia Martins Alves ◽  
Renata Ranielly Pedroza Cruz ◽  
Manoel Bandeira de Albuquerque
Keyword(s):  
Atlantic Forest ◽  
Polynomial Regression ◽  
Dry Mass ◽  
Melia Azedarach ◽  
Allelopathic Effect ◽  
Forest Species ◽  
Allelopathic Potential ◽  
Tukey Test ◽  
Naturally Occurring ◽  
Seed Index

Allelopathy is a naturally occurring phenomenon that results in the release of chemicals capable of stimulating or inhibiting the development of other nearby plants. The objective of this work was to evaluate the allelopathic potential of Melia azedarach on the germination, seed index, length and dry mass of seedlings of three Atlantic Forest species. The treatments were distributed in a bi-factorial scheme consisting of 5 concentrations (0, 2.5, 5.0, 7.5 and 10%) and 3 species (Ceiba speciosa, Leucaena leucocephala and Samanea tubulosa), in four replicates of 25 seeds totaling 100 seeds for each treatment. The Tukey test at 1% was used to compare the means. For quantitative effects, a SISVAR polynomial regression analysis for Windows software version 4.6. The extracts were obtained from 100 mg of dehydrated and crushed leaves of M. azedarach in 1000 ml of distilled water. The sowing was carried out on germitest paper and the seeds kept germinating in germinators of the type Biochemical Oxigen Demand (BOD) at 25°C with photoperiod of 12 h. The germination, germination velocity index (GVI), length and dry mass of shoot and root were evaluated. The results obtained in the laboratory showed that the aqueous extract of leaves M. azedarach has an allelopathic effect on all studied species, reducing the percentage of germination, speed index, length and dry mass of seedlings.

scholarly journals Métodos para a Superação de Dormência da Tarumarana

UNICIÊNCIAS ◽  
2021 ◽  
Vol 24 (2) ◽  
pp. 135-140
Author(s):  
Cristiane Ramos Vieira ◽  
Joás Dos Santos Soares ◽  
Bruno Conceição de Veiga ◽  
Maicon Marinho Vieira Araujo ◽  
Rayza Samara de Assis Carneiro
Keyword(s):  
Sulfuric Acid ◽  
Germination Percentage ◽  
Shoot Length ◽  
Hot Water ◽  
Initial Growth ◽  
Forest Species ◽  
Randomized Design ◽  
Breaking Dormancy ◽  
Germination Speed ◽  
Completely Randomized Design

A tarumarana (Buchenavia tomentosa Eichler) é uma espécie florestal com potencial para a recomposição florestal no bioma Cerrado. No entanto, a formação das mudas dessa espécie, via semente, fica comprometida, por esta apresentar dormência tegumentar. Com base nessa problemática, desenvolveu-se um experimento com o objetivo de avaliar a escarificação ácida e a imersão em água, como métodos para a superação da dormência de pirênios de tarumarana. Os tratamentos testados foram: T0 – sem tratamento para superação da dormência; T1 – imersão em água quente por uma hora; T2 – imersão em água quente por uma hora e meia; T3 – imersão em água quente por duas horas; T4 – imersão em ácido sulfúrico por uma hora; T5 – imersão em ácido sulfúrico por uma hora e meia. O experimento foi realizado em delineamento inteiramente casualizado, com 20 pirênios de tarumarana por repetição. Ao final de 30 dias, a contar do começo das emergências, foram avaliadas as seguintes variáveis: índice de velocidade de germinação (IVG), o tempo médio de germinação (TMG), porcentagem de germinação (G) e o índice de velocidade de germinação (IVG), comprimento da parte aérea (H) e diâmetro de coleto (DC). O método mais eficiente para a superação da dormência dos pirênios de tarumarana foi a imersão em água quente por uma hora e meia, que garantiu a maior taxa de germinação. No entanto, a imersão em água quente, como método para superação da dormência de pirênios de tarumarana, não influenciou de forma significativa no crescimento inicial em altura e em diâmetro das mudas obtidas.   Palavras-chave: Buchenavia Tomentosa. Ácido Sulfúrico. Água Quente. Quebra de Dormência. Semente Florestal.   Abstract Tarumarana (Buchenavia tomentosa Eichler) is a forest species with potential for restoration in the Cerrado biome. However, the formation of seedlings of this species, via seed, is compromised, because it presents integumentary dormancy. Based on this problem, an experiment was developed with the objective of evaluating acid scarification and immersion in water, as methods for overcoming dormancy in tarumarana pyrenes. The tested treatments were: T0 - without treatment to overcome dormancy; T1 - immersion in hot water for one hour; T2 - immersion in hot water for one hour and a half; T3 - immersion in hot water for two hours; T4 - immersion in sulfuric acid for one hour; T5 - immersion in sulfuric acid for one hour and a half. The experiment was carried out in completely randomized design, with 20 pyrenes of tarumarana per repetition. At the end of 30 days, counting from the beginning of emergencies, the following variables were evaluated: germination speed index (IVG), average germination time (TMG), germination percentage (G), the germination speed index (IVG), shoot length (H) and diameter (DC). The most efficient method for overcoming dormancy in tarumarana pyrenes was immersion in hot water for one hour and a half, which guaranteed the highest germination percentage. However, immersion in hot water, as a method to overcome dormancy of tarumarana pyrenes, did not influence, significantly, the initial growth in height and diameter of the seedlings obtained.   Keywords: Buchenavia tomentosa. Sulfuric Acid. Hot Water. Breaking Dormancy. Forest Seed.

scholarly journals Substrates and Temperatures in the Germination of Hibiscus sabdariffa L. Seeds

2018 ◽  
Vol 10 (12) ◽  
pp. 493
Author(s):  
J. J. A. Gomes ◽  
R. L. A. Bruno ◽  
P. A. F. R. de Melo ◽  
E. U. Alves ◽  
J. R. G. Araújo ◽  
...  
Keyword(s):  
Food Security ◽  
Dry Mass ◽  
Food Crops ◽  
Hibiscus Sabdariffa ◽  
Seedling Production ◽  
Germination Test ◽  
Paper Towel ◽  
Seedling Length ◽  
Germination Speed ◽  
Prevention Of Hypertension

Vegetable biodiversity in Brazil accounts for almost 67% of the plants on the planet, which are part of studies with focus on determinants of food security and access to adequate and healthy food, while preserving natural resources. Studies indicate that Hibiscus sabdariffa L. is one of the most studied unconventional food crops because of its nutraceutical quality as antioxidant and prevention of hypertension and cancer. Although relevant, substrate and temperature information for seedling production of this species are scarce. Thus, the aim of this study was to evaluate the best substrate and temperature for the vigor and germination test of H. sabdariffa seeds of the Talo Roxo and Rubra varieties. The experiment was laid out in a randomized complete design, in a 7 × 5 factorial arrangement, consisting of the combinations of seven substrates (paper towel, filter paper, vermiculite, between sand, on sand, plantmax® and compost) with five temperatures (20, 25, 30, 35 and 20-30 °C), with four replicates with 50 seeds each. The following variables were evaluated: germination, germination speed index, seedling length and dry mass. For germination and vigor tests of Hibiscus sabdariffa var. Talo Roxo seeds the paper roll substrate is recommended at temperatures of 25 or 35 °C and for var. Rubra seeds, plantmax® at 25 °C and plantmax® and vermiculite at temperatures of 25 or 20-30 °C, respectively.

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