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Plant Physiology 47:521-524 (1971)
© 1971 American Society of Plant Biologists

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Articles

Enhancement of Germination Rate of Aged Seeds by Ethylene

Kenji Takayanagi1 and James F. Harrington

a Department of Vegetable Crops, University of California, Davis, California 95616

Naturally and artificially aged seeds of rape, Brassica napus L., produced less ethylene than freshly harvested seed during the early stage of germination. With freshly harvested seeds one peak of ethylene production was observed during germination, which coincided with the emergence and elongation of root and cotyledon, accompanied by splitting of the seed coat. Application of exogenous ethylene was effective in accelerating germination in aged seeds but did not significantly improve the percentage of germination. Ethylene as a hormone was considered to serve as a stimulator of germination and growth. One of the factors causing seed aging might be the degeneration of an ethylene-producing system in the seed. Exogenous ethylene may be effective only for the seeds in which the ethylene-producing system is weakened but the following responding systems are still functional.

1 On leave from the National Institute of Agricultural Sciences, Hiratsuka, Kanagawa 254, Japan, and supported by the Study-Abroad Project of the Science and Technology Agency of Japan.






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Copyright © 1971 by the American Society of Plant Biologists