Influência do NaClO na germinação de sementes de alface em Parnaíba-PI

O presente trabalho foi desenvolvido em condições de casa de vegetação situada em Parnaíba-PI, município onde predominam altas temperaturas. Objetivou-se avaliar a germinação de diferentes lotes de sementes de alface antes e após a embebição em solução de hipoclorito de sódio (NaCIO). O delineamento experimental foi em blocos casualisados, com os tratamentos dispostos em arranjo fatorial 2 x 7 (duas variáveis como pré-germinativos: com imersão em NaClO e sem imersão em NaClO, e sete cultivares de alface), com quatro repetições. As variáveis analisadas foram: Primeira contagem do teste de germinação (PCG), Teste de germinação (TG) e Índice de velocidade de germinação (IVG). Analisando-se os dados obtidos, verificou-se que independente da presença ou ausência do tratamento pré-germinativo, a cultivar T6 foi a que apresentou os melhores resultados para as variáveis analisadas. Exceto T2, todas as outras cultivares que receberam tratamento com hipoclorito de sódio (NaClO) obtiveram resultados expressivos, em comparação com as que não receberam esse tratamento, entretanto, a germinação de todos os lotes foi inferior ao estabelecido para comercialização de sementes de alface, com recomendações acima de 80%. Influence of NaClO on lettuce seed germination in Parnaíba-PIAbstract: The present study aimed to evaluate, under conditions of a greenhouse located in Parnaiba, PI, where high temperatures and after soaking in solution of sodium hypochlorite (NaCIO), the germination of seeds of seven cultivars of lettuce. The experimental design was of randomized blocks, with treatments arranged in factorial arrangement 2 x 7 (two variables as pré-germinativos: with NaClO and immersion without immersion in NaClO, and seven cultivars of lettuce), with four replicates. The seeds were subjected to the following determinations: First germination test score (PCG), germination test (TG) and germination speed Index (IVG). Analyzing the data obtained, it was found that regardless of the presence or absence of treatment pre-germinative, cultivating T6 was presented the best results for the variables analyzed. Except for T2, all other cultivars that received treatment with sodium hypochlorite (NaClO) achieved significant results, compared to those who did not receive this treatment, however, the germination of all batches was lower than that established for commercialization of seeds of lettuce, with recommendations above 80.

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Preventing thermoinhibition in a thermosensitive lettuce genotype by seed imbibition at low temperature

Scientia Agricola ◽

10.1590/s0103-90162003000300010 ◽

2003 ◽

Vol 60 (3) ◽

pp. 477-480 ◽

Cited By ~ 6

Author(s):

Warley Marcos Nascimento

Keyword(s):

Seed Germination ◽

Low Temperature ◽

High Temperatures ◽

Lactuca Sativa ◽

Lettuce Seed ◽

Temperature Dependent ◽

Lettuce Seeds ◽

Lactuca Sativa L ◽

Lettuce Seed Germination ◽

Dark Green

Lettuce (Lactuca sativa L.) seed germination is strongly temperature dependent and under high temperatures, germination of most of genotypes can be erratic or completely inhibited. Lettuce seeds of 'Dark Green Boston' (DGB) were incubated at temperatures ranging from 15° to 35°C at light and dark conditions. Other seeds were imbibed in dark at 20°; 25°; 30°; and 35°C for 8 and 16 hours and then transferred to 20 or 35°C, in dark. Seeds were also incubated at constant temperature of 20° and 35 °C, in the dark, as control. In another treatment, seeds were primed for 3 days at 15°C with constant light. DGB lettuce seeds required light to germinate adequately at temperatures above 25°C. Seeds incubated at 20°C had 97% germination, whereas seeds incubated at 35°C did not germinate. Seeds imbibed at 20°C for 8 and 16 hours had germination. At 35°C, seeds imbibed initially at 20°C for 8 and 16 hours, had 89 and 97% germination, respectively. Seeds imbibed at 25°C for 16 hours, germinated satisfactory at 35°C. High temperatures of imbibition led to no germination. Primed and non-primed seeds had 100% germination at 20°C. Primed seeds had 100% germination at 35°C, whereas non-primed seeds germinate only 4%. The first hours of imbibition are very critical for lettuce seed germination at high temperatures.

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Investigations on the Control of Lettuce Seed Germination at High Temperatures

Journal of Experimental Botany ◽

10.1093/jxb/35.7.986 ◽

1984 ◽

Vol 35 (7) ◽

pp. 986-993 ◽

Cited By ~ 9

Author(s):

R. L. K. DREW ◽

P. A. BROCKLEHURST

Keyword(s):

Seed Germination ◽

High Temperatures ◽

Lettuce Seed ◽

Lettuce Seed Germination

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EFFECTS OF TEMPERATURE, SUBSTRATE AND LUMINOSITY CONDITIONS ON CHIA SEED GERMINATION

Revista Caatinga ◽

10.1590/1983-21252019v32n214rc ◽

2019 ◽

Vol 32 (2) ◽

pp. 411-418

Author(s):

CLAUDIA KELY PIRES DE MATTOS SORANA ◽

CARLOS HENRIQUE QUEIROZ REGO ◽

FERNANDA BRITO CARDOSO ◽

TIAGO ROQUE BENETOLI DA SILVA ◽

ANA CARINA DA SILVA CÂNDIDO ◽

...

Keyword(s):

Seed Germination ◽

High Temperatures ◽

Germination Test ◽

Paper Substrate ◽

Randomized Design ◽

Chia Seed ◽

Germination Speed ◽

Mean Germination Time ◽

Effects Of Temperature ◽

Completely Randomized Design

ABSTRACT The aim of the present study was to evaluate the effects of temperature, substrate, and luminosity on chia seeds in order to determine adequate conditions for a germination test. The experiment consisted of a completely randomized design, in a 4 × 5 × 2 factorial scheme (four substrates × five temperatures × two luminosity conditions), with four replications. The following variables were analyzed: first germination count, germination, germination speed index, and mean germination time. Germination was best at 15, 20, 25, and 30 °C for the on-paper, paper roll, and sand substrates. However, in the presence of luminosity and at 25 °C, the on-paper substrate had the highest mean. For all substrates, the lowest germination was achieved at 35 °C, proving that high temperatures reduce chia seed germination. Germination speed index was highest at 25 and 30 °C for on-paper, paper roll, and sand substrates, in both the presence and absence of luminosity. Chia seeds are considered to be neutral photoblasts. Germination tests should be performed with the on-paper substrate, at 25 °C, and with a duration of seven days. The first count should be carried out four days after establishment of the test.

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