Control of the germination of secondary dormant cocklebur seeds by various germination stimulants |
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Authors: | Esashi Yohji; Okazaki Makiko; Yanai Nobuaki; Hishinuma Kohya |
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Institution: | Department of Biological Science, Tohoku University Kawauchi, Sendai 980, Japan |
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Abstract: | The responsiveness of non-dormant, upper cocklebur (Xanthiumpennsylvanicum Wallr.) seeds to various germination stimulants,such as CO2 C2H4 CS(NH2)2, BA and enriched O2, decreased withincreasing periods of water imbibition and was completely lostin the state of secondary dormancy. Unlike CO2 BA and CS(NH2)2however, C2H2 and enriched O2 effectively prevented the developmentof secondary dormancy, and their combination was the most effectivefor stimulating the germination of seeds which had undergoneimbibition for a long time. CS(NH2)2 and BA were effective,not by themselves but either under anaerobiosis or elevatedO2 tension. Growth of the axial and cotyledonary segments excisedfrom aged seeds remained responsive to these germination stimulantsand could be further stimulated by exogenous C2H2. With imbibitionat a lower temperature, the seeds maintained high germinationin response to various stimulants and a high rate of C2H2 andCO2 production during a long period of water imbibition. Theseresults are discussed in terms of the two possible causes forthe loss of responsiveness or induction of the secondary dormancy. (Received June 27, 1978; ) |
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