Endogenous abscisic Acid levels in germinating and nongerminating lettuce seed |
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Authors: | Braun J W Khan A A |
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Institution: | New York State Agricultural Experiment Station, Cornell University, Geneva, New York 14456. |
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Abstract: | The concentrations of abscisic acid in Grand Rapids lettuce (Lactuca sativa L.) seeds imbibed under conditions which promote or inhibit germination were determined by electron capture-gas chromatography. The concentration of abscisic acid in dry seeds was 12 to 14 nanograms per 100 milligrams. During 24-hour imbibition, the abscisic acid content diminished more rapidly during conditions which allow germination (25 C in light) than in conditions which inhibited germination (35 C in light or darkness at 25 C). A decrease in endogenous levels of abscisic acid was not always correlated with germination. |
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