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Reversion from Light-Induced Inhibition of Seed Germination by Respiratory Inhibitors

Department of Biology, Faculty of Science, Yamagata University, Yamagata 990, Japan

Treating of the dark-imbibed lettuce (Lactuca sativa L.) seeds prior to light irradiation with 1 millimolar KCN or NaN₃ in the dark for 3 hours prevented blue light and far-red light-induced inhibitions of phytochrome-mediated germination. Similarly, salicylhydroxamic acid (SHAM) at 10 millimolar counteracted the blue and far-red light inhibitions, the combined application of KCN and SHAM being more effective than KCN or SHAM alone in some experiments. These respiratory inhibitors slightly inhibited phytochrome-mediated lettuce seed germination. These results indicate that both CN-sensitive, conventional cytochrome oxidase and CN-resistant (SHAM-sensitive), alternative respiration may be involved in the light inhibition or that an appropriate balance of both may be necessary for the light inhibition.