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Plant Physiology 43:2023-2028 (1968)
© 1968 American Society of Plant Biologists

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Articles

Opposing Actions of Light in Seed Germination of Poa pratensis and Amaranthus arenicola

S. B. Hendricks1, V. K. Toole2 and H. A. Borthwick3

Agricultural Research Service, United States Department of Agriculture, Beltsville, Maryland 20705

Action spectra were measured for suppression of germination of Poa pratensis L. and Amaranthus arenicola I. M. Johnston seed under prolonged or continuous irradiation. The action maxima for both types of seeds are near 720 nm. The maxima are unchanged in position or magnitude in the presence of radiation in the region of 600 to 670 nm adequate to maintain phytochrome predominantly in the far-red-absorbing form. A reversible potentiation of germination to change in form of phytochrome was observed for both seeds. The bearing of these findings on a high-energy regulatory light response is discussed.

1 Soil and Water Conservation Research Division.

2 Market Quality Research Division.

3 Crops Research Division.




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Copyright © 1968 by the American Society of Plant Biologists