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Plant Physiology 58:541-543 (1976)
© 1976 American Society of Plant Biologists

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Articles

Annual Variation in the Sterol Content of Digitalis purpurea L. Seedlings 1

Myra K. Jacobsohna,2 and Gert M. Jacobsohnb

a Department of Biology, Bryn Mawr College, Bryn Mawr, Pennsylvania 19010, Department of Biological Chemistry, Hahnemann Medical College, Philadelphia, Pennsylvania 19102

Seedings from a single lot of Digitalis purpurea L. seeds were germinated in batches over a period of 13 months. A total lipid extract was made which was resolved into esterified and unconjugated plus glycosylated sterol fractions. The amounts of sterol in each fraction and in the total were compared for seedlings germinated at different times of the year. The amount of esterified sterols reached a maximum value from March until June, and a low value from July until January. In January, a sharp increase began which lasted until March. Amounts of unconjugated and glycosylated sterols were elevated from March until June, low from July until October, and on the rise from November until March. These data correlate with an annual cycle in seed germination. The phase of maximum sterol content of seedlings is followed by a period of null germination.

2 Present address: Department of Biology, Beaver College, Glenside, Pa. 19038.

1 This work was done in partial fulfillment of the requirements for the degree of Doctor of Philosophy at Bryn Mawr College by M. K. J.






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