Journal Article

Restoration of Seed Germination at Supraoptimal Temperatures by Fluridone, an Inhibitor of Abscisic Acid Biosynthesis

Toshihito Yoshioka, Takashi Endo and Shigeru Satoh

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 39, issue 3, pages 307-312
Published in print March 1998 | ISSN: 0032-0781
Published online March 1998 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029371
Restoration of Seed Germination at Supraoptimal Temperatures by Fluridone, an Inhibitor of Abscisic Acid Biosynthesis

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Fluridone, an inhibitor of ABA biosynthesis, restored the seed germination of lettuce (Lactuca sativa L. cv. Grand Rapids) and many other plant species at supra-optimal temperatures. ABA content in lettuce seeds after imbibition quickly decreased at 23°C, but not at 33°C (a supraoptimal temperature). Fluridone caused a decrease in ABA content at 33°C, which suggests that the maintenance of high ABA content could be responsible for high-temperature inhibition of germination of lettuce seeds. This probably results from an increase in the rate of ABA biosynthesis at the higher temperature. The present study indicates that ABA plays a decisive role in the regulation of seed germination at supraoptimal temperatures.

Keywords: Abscisic acid (ABA); Fluridone; Lettuce (Lactuca sativa); Seed germination; Thermodormancy; Thermoinhibition

Journal Article.  0 words. 

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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