Dormancy and impotency of cocklebur seeds. II. Phase sequence in germination process

Interactions of C2H4, CO2, O2 and high temperature in stimulating germination of cocklebur (Xanthium pennsylvanicum Wallr.) seeds were studied and the phase sensitive to each factor during germination was determined. The combination of CO2 and enriched O2, and particularly that of C2H4 and enriched...

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Bibliographic Details
Published in:Plant and cell physiology 1975-08, Vol.16 (4), p.697-706
Main Authors: Katoh, H, Esashi, Y
Format: Article
Language:English
Subjects:
plant biochemistry
plant physiology
plants
weed science
weeds
Xanthium strumarium var. canadense
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Summary:Interactions of C2H4, CO2, O2 and high temperature in stimulating germination of cocklebur (Xanthium pennsylvanicum Wallr.) seeds were studied and the phase sensitive to each factor during germination was determined. The combination of CO2 and enriched O2, and particularly that of C2H4 and enriched O2, much more effectively stimulated germination than CO2 and C2H4. At low temperature, however, the cooperation of CO2 and enriched O2 was lost and only the effect of C2H4 in combination with CO2 or enriched O2 remained. Carbon dioxide stimulated C2H4 production and induced germination when it was applied in the first period of water imbibition, corresponding to the passive thrust forming phase. C2H4 became effective after the CO2-responsive phase. In contrast, both O2 enrichment and high temperature became increasingly effective with the imbibition times. Anaerobiosis applied during the first period of the germination process showed no inhibitory effect, whereas CO2 and C2H4 were stimulative even under such a condition.
ISSN:0032-0781
1471-9053
1471-9053
DOI:10.1093/oxfordjournals.pcp.a075190