scholarly journals Effects of high dilutions of Cymbopogon winterianus Jowitt (citronella) on the germination and growth of seedlings of Sida rhombifolia

2021 ◽  
Vol 7 (22) ◽  
pp. 31-35
Author(s):  
Rosimar Maria Marques ◽  
Giuliani Grazyella Marques-Silva ◽  
Carlos Moacir Bonato
Keyword(s):  
Germination Percentage ◽  
Fresh Mass ◽  
Primary Growth ◽  
Cymbopogon Winterianus ◽  
Germination Speed ◽  
High Dilutions ◽  
System Length ◽  
Germination And Growth ◽  
Sida Rhombifolia ◽  
Growth Of Seedlings

The effects of high dilutions of Cymbopogon winterianus (citronella) on the growth and germination of Sida rhombifolia are analyzed; 5 homeopathic dilutions (3cH, 6cH, 12cH, 24cH, 30cH) and a control (water) were used, with 5 repetitions. Variables analyzed were the primary growth of the root system, length of the shoot, fresh mass total, germination percentage and germination speed index. All dilutions stimulated the primary growth of the root. Dilutions 3cH, 6cH, 12cH and 30 cH stimulated the growth of the aerial parts and 24cH inhibited it. Dilutions 6cH, 12cH, 24cH and 30cH stimulated a larger production of fresh mass than 3cH. Dilution 12cH resulted in the largest germination percentage while 24cH in the lowest. Dilution 12cH resulted in the highest score in the germination speed index, while 3cH and 24cH in the lowest. Keywords: Homeopathic dilutions; Plants; Germination; Growth; Cymbopogon winterianus; Sida rhombifolia.   Efeitos de altas diluições de Cymbopogon winterianus Jowitt (citronella) na germinação e crescimento de sementes de Sida rhombifolia Resumo Os efeitos de altas diluições de Cymbopogon winterianus (citronella) no crescimento e germinação de Sida rhombifolia são analisados; 5 diluições ho´meopáticas (3cH, 6cH, 12cH, 24cH, 30cH) e um controle (água) foram utilizados, com 5 repetições. As variáveis analisadas foram: crescimento primário do sistema da raiz, longitude do broto, massa fresca total, porcentagem de germinação e índice de velocidade de germinação. As diluições 3cH, 6cH, 12cH e 30cH estimularam o crescimento das partes aéreas, que foi inibido pela diluição 24cH. As diluições 6cH, 12cH e 30cH estimularam uma maior produção de massa fresca que a diluição 3cH. A diluição 12cH mostrou a porcentagem máxima de germinação, enquanto 24cH mostrou a mínima. Igualmente, a diluição 12cH resultou no máximo índice de velocidade de germinação, enquanto as diluições 3cH e 24cH, os mínimos. Palavras-chave: Diluições Homeopática; Plantas; Germination; Crescimento; Cymbopogon winterianus; Sida rhombifolia.   Efectos de altas diluciones de Cymbopogon winterianus Jowitt (citronella) en la germinación y crecimiento de semillas de Sida rhombifolia Resumen Los efectos de altas diluciones de Cymbopogon winterianus (citronella) en el crecimiento y germinación de Sida rhombifolia son analizados; 5 diluciones homeopáticas (3cH, 6cH, 12cH, 24cH, 30cH) y un control (agua) fueron utilizados, con 5 repeticiones. Las variables analizadas fueron: crecimiento primario del sistema de la raíz, largura del brote, masa fresca total, porcentaje de germinación e índice de velocidade de germinación. Las diluciones 3cH, 6cH, 12cH y 30cH estimularon el crecimiento de las partes aéreas, mientras que éste fue inhibido por la dilución 24cH. Las diluciones 6cH, 12cH, 24cH y 30cH estimularon una mayor producción de masa fresca que la dilución 3cH. La dilución 12cH mostró el máximo porcentaje de germinación, mientras que la dilución 24cH, el mínimo. Igualmente, la dilución 12cH resultó en el máximo índice de velocidad de germinación, mientras que las diluciones 3cH y 24cH, los mínimos. Palabras-clave: Diluciones homeopáticas; plantas; germinación, crecimiento, Cymbopogon winterianus; Sida rhombifolia.   Correspondence author: Carlos Moacir Bonato, [email protected], State University of Maringá-SP, Brazil How to cite this article: Marques RM, Marques-Silva GG, Bonato CM. Effects of high dilutions of Cymbopogon winterianus Jowitt (citronella) on the germination and growth of seedlings of Sida rhombifolia. Int J High Dilution Res [online]. 2008 [cited YYYY Mmm DD]; 7(22): 31-35. Available: http://journal.giri-society.org/index.php/ijhdr/article/view/208/342.  

scholarly journals AUTOTOXICITY IN TOUGH LOVEGRASS ( Eragrostis plana )

2017 ◽  
Vol 35 (0) ◽  
Author(s):  
A. FAVARETTO ◽  
S.M. SCHEFFER-BASSO ◽  
N.B. PEREZ
Keyword(s):  
Seed Germination ◽  
Seedling Growth ◽  
Germination Percentage ◽  
Shoot Length ◽  
Aqueous Extracts ◽  
Early Seedling Growth ◽  
Germination Speed ◽  
Early Seedling ◽  
Mean Germination Time ◽  
Growth Of Seedlings

ABSTRACT Autotoxicity in tough lovegrass has been analyzed in the field, but has never been tested in allelopathy bioassays. Therefore, this study aimed to verify and compare the autotoxicity of leaves and roots from aqueous extracts of tough lovegrass on its germination and early seedling growth. Extracts of green leaves (GL), senescent leaves (SL), and roots (R) at concentrations of 0.05, 0.15, and 0.25 g mL-1 were analyzed on how they affected seed germination and seedling growth. The extracts, regardless of the source or concentration of the material used, have significantly reduced germination percentage, index of germination speed, and root growth of seedlings of tough lovegrass. Effects on mean germination time and shoot length varied according to the origin and concentration of the extracts. GL, at concentrations 0.15 and 0.25 g mL-1, showed the most damaging effect. In tough lovegrass, autotoxicity is a mechanism that may be involved in the control of germination and plant growth, which could explain the distance between their clumps in the field.

Chitosan coating on bean and maize seeds: release of agrochemical fungicide and post-storage condition

2021 ◽  
Vol 43 ◽  
Author(s):  
Nancy Araceli Godínez-Garrido ◽  
Juan Gabriel Ramírez-Pimentel ◽  
Jorge Covarrubias-Prieto ◽  
Francisco Cervantes-Ortiz ◽  
Artemio Pérez-López ◽  
...  
Keyword(s):  
Seed Germination ◽  
Defense Mechanisms ◽  
Germination Rate ◽  
Storage Condition ◽  
Germination Percentage ◽  
Negative Effects ◽  
Retention Capacity ◽  
Chitosan Coating ◽  
Maize Seeds ◽  
Germination Speed

Abstract: Chitosan is a biopolymer obtained from deacetylation of chitin; it has multiple applications in agriculture as an antifungal, soil conditioner, inducer of defense mechanisms, fruits postharvest coating, leaves and seeds, among others. The objective in this research was to evaluate the effect of chitosan coatings mixed with fungicide (dithiocarbamate) on the germination and germination speed of bean and maize seeds in storage and to determine the retention capacity of the fungicide in the coated seeds under different times of imbibition. Two coating treatments at concentrations of 0.1 and 0.5% chitosan in water, two coatings treatments at 0.1 and 0.5% chitosan supplemented with 0.5% fungicide and a coating without chitosan using only 0.5% fungicide in water were used in bean and maize seed; and as control seeds imbibed in distilled water were used; after treatments, germination percentage and germination speed were determined, also fungicide release were determined at 0, 1, 2 and 6 h of imbibition, and the effect of storage time on germination and germination speed was determined at 30, 60, 90, 120, 150 and 180 days of storage at 4 °C and 45% relative humidity. The fungicide release effect was determined by inhibiting Fusarium oxysporum conidia germination. There were no negative effects of coatings on seed germination after storage. The treatment that provided both greater retention of the fungicidal agent and released it gradually, was 0.5% chitosan mixed with fungicide concentration. Chitosan coating seeds mixed with fungicide do not cause negative changes in seed germination or germination rate.

scholarly journals Dormancy break in seeds of "quina" (Strychnos pseudoquina A. St.-Hil.)

2011 ◽  
Vol 13 (4) ◽  
pp. 507-511 ◽  
Author(s):  
J.M. Vasconcelos ◽  
M.A. Rodrigues ◽  
S.C. Vasconcelos Filho ◽  
J.F. Sales ◽  
F.G. Silva ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Medicinal Plant ◽  
Gibberellic Acid ◽  
Plant Species ◽  
Germination Percentage ◽  
Boiling Water ◽  
Medicinal Plant Species ◽  
Distilled Water ◽  
Brazilian Cerrado ◽  
Germination Speed

"Quina" (Strychnos pseudoquina A. St. Hil) is a medicinal plant species from the Brazilian Cerrado. As its seeds show dormancy, they were subjected to the treatments pre-cooling at 5ºC during 7 days, pre-heating at 40ºC during 7 days, pre-soaking in sulfuric acid PA during 5 and 15 min, pre-soaking in boiling water during 5 and 15 min, pre-soaking in 100 and 200 ppm gibberellic acid during 48 h, pre-soaking in distilled water during 24 and 48 h, and mechanical scarification to break dormancy. Counts were daily conducted from the 2nd day after the experiment implementation until the germination stabilization at the 65th day. The germination speed index (GSI) and the germination percentage were evaluated. Germination rates above 96% were reached in seeds pre-soaked in water during 48 h and substrate moistened with water or KNO3.

scholarly journals Endozoochory by native and exotic herbivores in dry areas: consequences for germination and survival ofProsopisseeds

2008 ◽  
Vol 18 (2) ◽  
pp. 91-100 ◽  
Author(s):  
Claudia M. Campos ◽  
Begoña Peco ◽  
Valeria E. Campos ◽  
Juan E. Malo ◽  
Stella M. Giannoni ◽  
...  
Keyword(s):  
Germination Percentage ◽  
Lepus Europaeus ◽  
Arid Zones ◽  
Large Herbivores ◽  
Lama Guanicoe ◽  
Equus Asinus ◽  
Germination Speed ◽  
Herbivore Faeces ◽  
Prosopis Flexuosa ◽  
Apparently Healthy

AbstractMammalian herbivores can play a role in the endozoochorous dispersal ofProsopisseeds in the arid zones of Argentina, and the introduction of exotic mammals can change relevant parameters of the plant's reproductive ecology. Our specific goals were to quantify the seeds ofProsopis flexuosa,P. chilensisandP. torquatacontained in the faeces of native [mara (Dolichotis patagonum), guanaco (Lama guanicoe)] and exotic [donkey (Equus asinus) and hare (Lepus europaeus)] mammals, and to determine the mortality, germination percentage and germination speed of seeds borne in faeces, compared with those collected from trees. In 2006, seeds were collected directly from trees or removed from mammal faeces. Seeds were counted and classified as apparently healthy or damaged.P. torquataandP. flexuosaseeds were found in the dung of guanaco, hare and mara, whereas onlyP. flexuosaseeds appeared in donkey faeces.P. chilensisseeds were only found in guanaco faeces. There was a notable relative abundance of seeds contained in small herbivore faeces in comparison to the large herbivores. The passage through the digestive tract of animals modified seed germination capacity and speed, with great variability between animal species. Guanacos had greater effects than donkeys on mortality, germination percentage and germination speed. Differences between the effects of both smaller-sized herbivores on seeds were much smaller.

scholarly journals GERMINAÇÃO DE SEMENTES DE Vochysia bifalcata EM DIFERENTES SUBSTRATOS E TEMPERATURAS

FLORESTA ◽  
2014 ◽  
Vol 44 (4) ◽  
pp. 669 ◽  
Author(s):  
Helena Cristina Rickli ◽  
Antonio Carlos Nogueira ◽  
Henrique Soares Koehler ◽  
Katia Christina Zuffellato-Ribas
Keyword(s):  
Rio De Janeiro ◽  
Germination Percentage ◽  
Minas Gerais ◽  
Sao Paulo ◽  
São Paulo ◽  
Santa Catarina ◽  
Blotting Paper ◽  
Dense Forest ◽  
Germination Speed ◽  
Different Temperatures

Guaricica (Vochysia bifalcata) é uma espécie arbórea nativa do Brasil, presente na vegetação secundária da Floresta Ombrófila Densa dos estados do Paraná, Santa Catarina, São Paulo, Rio de Janeiro e Minas Gerais, sendo de grande importância na regeneração de áreas degradadas e para fins madeireiros. Este estudo teve por objetivo avaliar os efeitos de diferentes temperaturas (20, 25 e 30 °C) e substratos (rolo de papel, papel mata-borrão e vermiculita) na germinação de sementes de Vochysia bifalcata, as quais foram mantidas em germinadores sob luz constante. Foram realizadas avaliações diárias até o 20° dia após a semeadura, analisando-se as seguintes variáveis porcentagem de germinação, índice de velocidade de germinação, tempo médio de germinação e índice de sincronização. A temperatura de 25 °C, nos substratos papel mata-borrão e vermiculita apresentaram a maior germinação (70 e 73%, respectivamente) e maior índice de velocidade de germinação, porém com menor sincronismo. Assim, para o teste de germinação de guaricica, é recomendado o uso dos substratos papel mata-borrão ou vermiculita na temperatura de 25 °C.Palavras-chave:  Vochysiaceae; guaricica; índice de sincronização; índice de velocidade de germinação. AbstractGermination of Vochysia bifalcata under different substrates and temperatures. Guaricica (Vochysia bifalcata) is a native Brazilian tree species, present in the secondary vegetation of the Ombrophilous Dense Forest in the States of Paraná, Santa Catarina, São Paulo, Rio de Janeiro, and Minas Gerais. It is of great importance in degraded areas regeneration and for timber production. This research aimed to evaluate the effects of different temperatures (20, 25 and 30 ºC) and substrates (paper roll, blotting paper and vermiculite) during the germination of Vochysia bifalcata seeds. We conducted germination tests inside germination chambers under constant illumination. Until the 20th day after the installation, daily evaluations analyzed the following variables: germination percentage, germination speed index, average germination time, and synchronization index. The temperature of 25 °C in blotting paper and vermiculite substrate presented the highest germination (70 and 73%, respectively) and highest germination speed index, but with less synchronism. Therefore, it recommends use of blotting paper and vermiculite as substrates in a temperature of 25 ºC for the Vochysia bifalcata germination test.Keywords: Vochysiaceae; guaricica; index synchronization; germination speed index

scholarly journals Application of Trichoderma harzianum on the physiological quality of cowpea seeds

2021 ◽  
pp. 643-648
Author(s):  
Marcelo Laranjeira Pimentel ◽  
Henara Valéria Miranda Castro ◽  
Mike Kirixi Munduruku ◽  
Larissa Conceição Cunha Ponte ◽  
Deyvielen Maria Ramos Alves ◽  
...  
Keyword(s):  
Trichoderma Harzianum ◽  
Seed Treatment ◽  
Germination Percentage ◽  
Hypocotyl Length ◽  
Cowpea Seeds ◽  
Randomized Design ◽  
Germination Speed ◽  
Physiological Quality ◽  
Set Up

The use of fungi in seed treatment can improve the plant's physiological characteristics. The aim of this study was to evaluate the influence of the use of Trichoderma harzianum on the physiological quality of bean seeds. The experiment was set up and conducted in the forest seed laboratory of the Federal University of Western Para, in a randomized design, using 4 procedures on the basis of a colony forming unit (CFU): T1 (0 CFU), T2 (4 x 109 CFU), T3 (8 x 109 CFU) and T4 (12 x 109 CFU), with 5 repetitions. Germination percentage (G%), germination speed index (GSI), hypocotyl length (HL) and radicle length (RL) were evaluated as variables. The data were analyzed by variance analysis and the averages were compared using the Tukey test (p≤0.05), in addition to the regression analysis, using the Minitab© version 18 statistical software. There were differences between the germination percentage tests, in which T2 obtained 100% of germinated seeds, for GSI it was observed that T2 and T3 were equal and superior to the other treatments, while for RL T1 and T2 obtained the best results, however, for HL there were no statistical differences between treatments. T2 was more efficient in the physiological quality of seeds to germination percentage and germination speed index

scholarly journals ALLELOPATHIC POTENTIAL OF WEED SPEICES AGERATUM CONYZOIDES L. AND CLEOME VISCOSA L. ON GERMINATION AND GROWTH OF SESAMUM INDICUM L

2015 ◽  
Vol 2 (2) ◽  
pp. 114-117
Author(s):  
Anbarasan R ◽  
Prabhakaran J
Keyword(s):  
Growth Parameters ◽  
Dry Weight ◽  
Inhibitory Effect ◽  
Germination Percentage ◽  
Sesamum Indicum ◽  
Weed Species ◽  
Ageratum Conyzoides ◽  
Allelopathic Potential ◽  
Germination And Growth ◽  
Cleome Viscosa

Various concentrations (5%, 10%, 15% and 20%) of aqueous extracts prepared from two weed species namely Ageratum conyzoides L. and Cleome viscosa L. and used for the present experiments to determine their allelopathic potential on growth and developmental changes on sesame (Sesamum indicum L.). The weed extracts showed an inhibitory effect on germination percentage, root and shoot growth, and fresh and dry weight of sesame seedlings. The extracts of A.conyzoides had more inhibitory effect at 20%concentration,than that of C.viscosa on growth parameters of sesame.

scholarly journals SUPERAÇÃO DA DORMÊNCIA EM SEMENTES DE Plathymenia reticulata Benth.

Nativa ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 317
Author(s):  
Cássio Do Prado Borges ◽  
Cheila Deisy Ferreira ◽  
Daniela Pereira Dias
Keyword(s):  
Electrical Conductivity ◽  
Germination Percentage ◽  
Lateral Side ◽  
Detergent Solution ◽  
Sodium Hypochlorite Solution ◽  
Percentage Germination ◽  
Dormancy Breaking ◽  
Germination Speed ◽  
Mean Germination Time ◽  
T1 And T2

Este trabalho objetivou avaliar a germinação e vigor de sementes de Plathymenia reticulata Benth. submetidas a diferentes tratamentos para superação de dormência. Os tratamentos testados foram: controle - sementes intactas (T0), escarificação mecânica com lixa d’água nº 60 (T1), desponte na região lateral do tegumento (T2), imersão em água fervente por 10 min (T3), em hipoclorito de sódio por 15 min (T4) e em solução com detergente por 15 min (T5). Foram determinados: peso de mil sementes, grau de umidade, porcentagem de germinação, índice de velocidade de germinação (IVG), tempo médio de germinação (TMG), curva de embebição, teste da condutividade elétrica e comprimento da radícula. A porcentagem de germinação das sementes submetidas ao T1 e T2 foi estatisticamente igual (respectivamente, 90 e 88%) e superiores aos outros tratamentos testados (12%). As sementes expostas aos T1 e T2 apesentaram porcentagem de absorção de água superiores e em menor tempo, assim como maiores IVG e menores TMG, comparadas aos demais tratamentos. O comprimento das radículas não variou entre os tratamentos testados. A condutividade elétrica da solução com as sementes do T0 foi superior aos outros tratamentos testados. Sementes de P. reticulata expostas ao T1 e T2 apresentam maior germinação e vigor.Palavras-chave: germinação, índice de velocidade de germinação, teste de condutividade elétrica, vigor, vinhático. DORMANCY BREAKING OF Plathymenia reticulata Benth. SEEDS ABSTRACT:This study aimed to evaluate the germination and vigor of Plathymenia reticulata Benth. seeds submitted to different dormancy breaking treatments. Testing treatments were: control - intact seeds (T0); mechanical scarification with sandpaper n. 60 (T1), coating cutting in the lateral side of tegument (T2), immersion in boiling water during 10 min (T3), in sodium hypochlorite solution during 15 min (T4), and in detergent solution during 15 min (T5). Moisture content, 1000-seed weight, germination percentage, germination speed index (GSI), mean germination time (MGT), imbibition curve, electrical conductivity test, and radicle length were determined. Germination percentage to T1 and T2 were statistically equal (90 and 88 %, respectively) and higher than others treatments tested (12%). Seeds exposed to T1 and T2 also presented higher and faster water absorption percentage, when compared to the others treatments, as well as higher GSI, and lower MGT. The rootlets length did not vary among treatments tested. Electrical conductivity of intact seeds was higher than others treatments. P. reticulata seeds expose to T1 e T2 had highest germination percentage and vigor.Keywords: germination, germination speed index, electrical conductivity test, vigor, vinhático.

scholarly journals Isolation and Characterization of Rhizosphere Bacteria and their Effect on Germination of Rice Seeds and Growth of Seedlings

1970 ◽  
Vol 15 ◽  
pp. 77-82 ◽  
Author(s):  
Shamima Nasrin ◽  
MA Rahman
Keyword(s):  
Mineral Nutrients ◽  
Soil Microflora ◽  
Rhizosphere Bacteria ◽  
Rice Seedlings ◽  
Root Zones ◽  
Isolation And Characterization ◽  
Rice Seeds ◽  
Germination And Growth ◽  
Growth Of Seedlings

Rhizosphere bacteria were isolated from root zones from rice fields. These were cultured in laboratory conditions and investigated the effects on germination and growth of rice seedlings. They inhabit around the roots and live on root exude and benefit the plants by altering the solubility and availability of mineral nutrients and protecting the roots from invasion of pathogens by creating an antibiotic barrier around the root. It has been found that rhizosphere bacteria have no effect on germination of rice seeds. Both the rhizosphere bacteria and the Agrobacterium have been found to produce better growth of rice seedlings in pot cultures but later is less effective than the former. Rhizosphere bacteria are mixtures of many e.g. Actimomyces, Proteobacteria, Pseudomonas etc. but Agrobacterium sp is single. Key words: Rhizosphere, Bacteria, Symbiosis, Soil microflora, Non-leguminous plants. doi: 10.3329/jbs.v15i0.2206 J. bio-sci. 15: 77-82, 2007

scholarly journals Germination and vigour of primed asparagus seeds

2005 ◽  
Vol 62 (4) ◽  
pp. 319-324 ◽  
Author(s):  
Mário Lúcio de Carvalho Bittencourt ◽  
Denise Cunha Fernandes dos Santos Dias ◽  
Luiz Antônio dos Santos Dias ◽  
Eduardo Fontes Araújo
Keyword(s):  
Sea Water ◽  
Seedling Emergence ◽  
Germination Percentage ◽  
Peg 6000 ◽  
Beneficial Effects ◽  
Germination Speed ◽  
Speed Up ◽  
Physiological Quality ◽  
Controlled Deterioration

The osmotic conditioning or priming is considered a promising technique to speed up germination and to improve seed performance. Four seed lots of asparagus, Mary Washington cultivar, were primed at 25°C for seven or 14 days using PEG 6000 at -1.0 or -1.2 MPa, or sea water at -3.3 MPa; or for three days in distilled water. The physiological quality of the seeds was evaluated by standard germination, first count germination, speed of seedling emergence, and germination percentage and seedling fresh and dry weights after controlled deterioration test. Primed seeds presented higher germination speed, independently of their initial physiological quality. Beneficial effects of priming on germination and vigour were more expressive in the seed lot of low physiological quality. Priming in PEG 6000 at -1.0 MPa for 14 days was the most beneficial treatment to improve asparagus seeds performance.

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