Temperatura inicial de germinação no desempenho de plântulas e mudas de tomate

Ferreira, Roberta Leopoldo; Forti, Victor Augusto; Silva, Vanessa Neumann; Mello, Simone da Costa

doi:10.1590/s0103-84782013000700008

Cited by 13 publications

(12 citation statements)

References 14 publications

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“…reduced the vigor of the lettuce seeds. Only the Everglades cultivar showed greater tolerance to the thermal stress of the room; however, from 90 storage days, a reduction of its emergence is observed at temperatures of 25 and 35 o C. Similar results were observed by Ferreira et al (2013), according to whom, the temperature of 33 o C affected the emergence and emergence speed of tomato seedlings. This is due to the fact that these temperatures affect the reorganization speed of cellular membranes, affecting the metabolism of the seeds and, thus, reducing the emergence speed of the seedlings.…”

Section: Resultssupporting

confidence: 75%

Physiological and isozyme alterations in lettuce seeds under different conditions and storage periods

et al. 2016

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-The objective of the study was to determine the physiological and isozyme alterations in lettuce seeds submitted to different conditions and storage periods. We used a completely randomized design with four replications in a factorial arrangement with six lettuce cultivars (Everglades, Babá de Verão, Elisa, Grand Rapids, Hortência and Salinas 88) and four storage periods (30, 60, 90 and 120 days), on three storage rooms (15, 25 and 35 ° C). The physiological quality was evaluated by first and final germination count, emergence, and germination and emergence speed indexes. The isoenzyme expression of catalase (CAT), esterase (EST), alcohol dehydrogenase (ADH) and malate dehydrogenase (MDH) were determined. The physiological quality of lettuce seeds was preserved when stored at 15 ° C room temperature. The high room temperatures associated with higher storage periods cause a reduction in physiological quality and alterations in enzymatic patterns of CAT, EST, ADH and MDH. For seeds stored at 15 ° C, there were no physiological changes. The lettuce cultivars, especially Everglades, have different levels of tolerance to storage and isoenzyme expressions.Index terms: Lactuca sativa, enzymes, storability, thermotolerance.Alterações fisiológicas e isoenzimáticas em sementes de alface em diferentes condições e períodos de armazenamento Termos para indexação: Lactuca sativa, enzimas, potencial de armazenamento, termotolerância.

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Section: Resultssupporting

confidence: 75%

Physiological and isozyme alterations in lettuce seeds under different conditions and storage periods

et al. 2016

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“…The amount of water/solution absorbed by the seeds for each treatment was calculated by weight difference. The hydration curves were constructed and the appropriate period at which to interrupt the procedure was determined to investigate the effect of seed priming (FERREIRA et al, 2013).…”

Section: First Stepmentioning

confidence: 99%

Beet seed priming with growth regulators

Dotto

Silva

2017

SCA

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Seed priming is a technique used to induce metabolic germination processes. Use of growth regulators in seed priming may facilitate increments in physiological processes during seed germination. The objective of this study was to evaluate the effect of priming and growth regulators on beet seed germination. The treatments were cultivar type (Early Wonder, Itapuã and Maravilha) and seed priming technique, which included a control (unconditioned seed) standard hydropriming (water) and a conditioning with salicylic, gibberellic and ascorbic acids, respectively. The treatments were defined by initially testing 0, 1, 2 and 4 mM ascorbic, gibberellic and salicylic acids. Before seed priming, imbibition seed curves were established to determine the optimal conditioning time. After conditioning, the germination, rate of germination, seedling length and seedling dry weight were evaluated. First, the appropriate dosage for conditioning was determined by using a completely randomized experimental design, with four replications per cultivar. Then, a 3 x 5 (cultivar x conditioning technique) factorial design was adopted. Whenever the results were significant by variance analysis, regression analysis was performed. Finally, Tukey's test was used to compare the means at P=0.05. Beet seed priming alters the potential of germination and is influenced by the cultivar and conditioning technique. Pretreatment with 1−2 mM ascorbic, gibberellic or salicylic acids, respectively, promotes beet seed germination, whereas at 1−3 mM, the growth of roots and shoots of beet seedlings is promoted. The most effective techniques to promote germination and growth of sugar beet seedlings were priming with water, salicylic acid or gibberellic acid. Key words: Beta vulgaris. Hydropriming. Gibberellic acid. Salicylic acid. Ascorbic acid. ResumoO condicionamento fisiológico é uma técnica que permite a ativação dos processos metabólicos e fisiológicos na germinação das sementes por meio da utilização de reguladores de crescimento. Desta forma, objetivou-se avaliar o efeito do condicionamento fisiológico de sementes de beterraba com reguladores de crescimento. Foram utilizadas três cultivares: Early Wonder, Itapuã e Maravilha, submetidas a cinco tipos de condicionamentos: testemunha (semente não condicionada) hidrocondicionamento padrão (água), condicionamento com os ácidos salicílico, giberélico e ascórbico. Para definição dos tratamentos, foram testadas doses de 0; 1; 2 e 4 mMol.L -1 dos ácidos. Previamente ao condicionamento, foram realizadas as curvas de embebição das sementes, para determinação do tempo ideal de condicionamento, logo após, as sementes foram avaliadas quanto à porcentagem e velocidade de germinação, comprimento e massa seca de plântulas. O delineamento experimental utilizado foi inteiramente casualizado com quatro repetições, separado para cada cultivar, determinando-se as dosagens adequadas. Na segunda etapa foi adotado esquema fatorial 3 x 5 (cultivares x tipo de condicionamento). Os resultados foram submetidos a análise ...

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“…In the 'Mariana' hybrid tomato plant, Ferreira et al (2013) found that temperatures higher than 30 ºC led to greater water uptake by seeds in comparison to the control treatment (20-30 °C), and uptake was faster in the first 25 h, determining this period as the first phase of germination. After this period, stabilization of seed moisture content was observed, characterizing it as phase II of germination.…”

Section: Resultsmentioning

confidence: 92%

Effect of temperature on passion fruit emergence and seedling vigor

et al. 2017

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-Seedlings for commercial growing of passion fruit are preferentially acquired through seeds. Success in germination and seedling emergence, in turn, is influenced by the genetic constitution of the progenies and the thermal conditions imposed on the growth environment. The aim of this study was to evaluate the emergence and vigor of seedlings of passion fruit cultivars exposed to different temperatures. The experiment was conducted in a germination chamber at the Unidade de Ensino, Pesquisa e Extensão / Pomar Campus of the Department of Plant Science of the Universidade Federal de Viçosa (UFV). The study was carried out in 5 × 3 factorial arrangement, with five temperature ranges (5-15, 10-20, 15-25, 20-30 and 25-35 °C) and three varieties of passion fruit (BRS Sol do Cerrado, BRS Gigante Amarelo and FB-200 Yellow Master) in a completely randomized design with six replications of 25 seeds per plot. The variables analyzed were the percentage, the speed index, and the average time of emergence, shoot length, total length, and seedling dry matter. The cultivars BRS Sol do Cerrado and BRS Gigante Amarelo exhibited seedling emergence of over 95% in the temperature ranges of 20-30 °C and 25-35 °C. Alternating temperatures from 20-30 °C stimulates seedling emergence, seedling growth, and greater accumulation of seedling dry matter.Index terms: Passiflora edulis Sims, cultivars, seeds, thermal conditions. Emergência e vigor de plântulas de maracujazeiro azedo em função da temperatura RESUMO -A propagação de plantas de maracujazeiro azedo, em plantios comerciais, é realizada preferencialmente por meio de sementes. O sucesso da germinação e emergência de plântulas, por sua vez, é influenciado pela constituição genéticas das progênies e pelas condições térmicas impostas no ambiente. O objetivo neste trabalho foi avaliar a emergência e o vigor de plântulas de cultivares de maracujazeiro azedo sob exposição de diferentes temperaturas. O experimento foi conduzido em câmara de germinação na Unidade de Ensino, Pesquisa e Extensão/Pomar Campus pertencente ao Departamento de Fitotecnia da UFV. O trabalho foi desenvolvido em esquema fatorial 5 × 3, com cinco faixas de temperatura (5-15; 10-20; 15-25; 20-30 e 25-35 °C) e três cultivares de maracujazeiro azedo (BRS Sol do Cerrado, BRS Gigante Amarelo e FB-200 Yellow Master) no delineamento inteiramente casualizado e seis repetições de 25 sementes por parcela. As variáveis analisadas foram as percentagem, índice de velocidade e tempo médio de emergência, o comprimento da parte aérea e total e massa seca de plântula. As cultivares BRS Sol do Cerrado e BRS Gigante Amarelo apresentaram emergência de plântulas acima de 95% nas faixas de temperaturas de 20-30 °C e 25-35 °C. Temperaturas alternadas 20-30 °C estimulam a emergência, o crescimento e maior acúmulo de massa seca das plântulas.

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Temperatura inicial de germinação no desempenho de plântulas e mudas de tomate

Cited by 13 publications

References 14 publications

Physiological and isozyme alterations in lettuce seeds under different conditions and storage periods

Physiological and isozyme alterations in lettuce seeds under different conditions and storage periods

Beet seed priming with growth regulators

Effect of temperature on passion fruit emergence and seedling vigor

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