Dormancy and impotency of cocklebur seeds II. Phase sequence in germination process |
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Authors: | Katoh Hajime; Esashi Yohji |
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Institution: | Department of Biological Science, Tohoku University Kawauchi, Sendai 980, Japan |
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Abstract: | Interactions of C2H4, CO2, O2 and high temperature in stimulatinggermination of cocklebur (Xanthium pennsylvanicum Wallr.) seedswere studied and the phase sensitive to each factor during germinationwas determined. The combination of CO2 and enriched O2, andparticularly that of C2H4 and enriched O2, much more effectivelystimulated germination than CO2 and C2H4. At low temperature,however, the cooperation of CO2 and enriched O2 was lost andonly the effect of C2H4 in combination with CO2 or enrichedO2 remained. Carbon dioxide stimulated C2H4 production and induced germinationwhen it was applied in the first period of water imbibition,corresponding to the passive thrust forming phase. C2H4 becameeffective after the CO2-responsive phase. In contrast, bothO2 enrichment and high temperature became increasingly effectivewith the imbibition times. Anaerobiosis applied during the firstperiod of the germination process showed no inhibitory effect,whereas CO2 and C2H4 were stimulative even under such a condition. (Received August 26, 1974; ) |
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