Effects of 35 C Heat Treatments on Photosensitive Grand Rapids Lettuce Seed Germination 1

AUTOR(ES)

Carpita, Nicholas C.

RESUMO

Grand Rapids lettuce (Lactuca sativa L.) seeds were given 35 C heat treatments to increase photodormancy in a subsequent 20 C dark period. Short heat treatments (1-5 hours) induced a significant germination percentage increase of from 16% to over 50% depending on seed lot. With longer heat treatments dark germination percentage was gradually reduced to zero. If given at the end of 35 C, far red or red followed by far red further increased the amount of dark germination.

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