Water relations of lettuce seed thermoinhibition. II. Ethylene and endosperm effects on base water potential

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Abstract
A water relations (hydrotime) model was employed to characterize the responses of lettuce (Lactuca sativa L.) seed germination to temperature, water potential (b), standard deviations of base water potential and hydrotime constants ( and supraoptimal temperatures in the presence or absence of ACC. The distribution of b(g)) increased (became more positive) as the imbibition temperature increased, indicating a greater sensitivity of seeds to reduced b(g) distributions compared with intact seeds as temperature increased. ACC (10 mm) in the imbibition solution raised the upper temperature limit for germination by about 2b(g) values by 0.1 to 0.2 MPa. The effect of ACC on threshold for the initiation of growth as temperature increases. Evidence from other species as well suggests that this may be a general mechanism for the action of ethylene in promoting seed germination.

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