scholarly journals Effects of 35 C Heat Treatments on Photosensitive Grand Rapids Lettuce Seed Germination

1976 ◽  
Vol 57 (4) ◽  
pp. 612-616 ◽  
Author(s):  
Nicholas C. Carpita ◽  
Murray W. Nabors
Keyword(s):  
Seed Germination ◽  
Heat Treatments ◽  
Lettuce Seed ◽  
Grand Rapids ◽  
Lettuce Seed Germination

The effect of lettuce seed extracts on lettuce seed germination

1975 ◽  
Vol 53 (7) ◽  
pp. 593-599 ◽  
Author(s):  
Henry L. Speer ◽  
Dorothy Tupper
Keyword(s):  
Abscisic Acid ◽  
Liquid Chromatography ◽  
Seed Germination ◽  
Seed Coat ◽  
Gas Liquid Chromatography ◽  
Lettuce Seed ◽  
Lettuce Seeds ◽  
Grand Rapids ◽  
Lettuce Seed Germination ◽  
Seed Extracts

Lettuce seeds (Lactuca sativa var. Grand Rapids) were found to contain inhibitory substances, one of which is probably abscisic acid. Extracts from seeds were characterized by gas–liquid chromatography, and peaks coincident with abscisic acid were found.The germination water surrounding seeds made secondarily dormant was subjected to gas–liquid chromatography and was also found to contain peaks coincident with abscisic acid. It was also determined that the inhibitory substances are localized in the embryo but not in the endosperm or seed coat.

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

2003 ◽  
Vol 60 (3) ◽  
pp. 477-480 ◽  
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.

Dichloromethane and Lettuce Seed Germination

Science ◽  
1973 ◽  
Vol 179 (4068) ◽  
pp. 96-96
Author(s):  
H. Meyer ◽  
A. M. Mayer
Keyword(s):  
Seed Germination ◽  
Lettuce Seed ◽  
Lettuce Seed Germination
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