Journal of Weed Science and Technology
Online ISSN : 1882-4757
Print ISSN : 0372-798X
ISSN-L : 0372-798X
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Volume 57, Issue 2
Displaying 1-7 of 7 articles from this issue
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  • Seed setting of centipedegrass and dormancy and germination characteristics of seeds produced on levees
    Yoshinori Kawaguchi, Keiko Nakatani, Yoko Oki, Hiroshi Hasegawa
    2012 Volume 57 Issue 2 Pages 31-35
    Published: 2012
    Released on J-STAGE: August 25, 2012
    DOIhttps://doi.org/10.3719/weed.57.31
    JOURNAL FREE ACCESS
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    In Japan, basic information is needed to produce a risk evaluation for assessing centipedegrass (Eremochloa ophiuroides (Munro) Hack.) seed propagation from levees. In this study, the state of seed setting of centipedegrass on levees in Shiga Prefecture and characteristics of dormancy and germination of its seeds produced on levees were examined. A seed setting survey showed that >8,000 seeds/m2 were produced on levees. Seeds harvested on levees were stored in an air-dry conditions for 23, 60, or 100 days and in chilling-wet conditions for 40 or 80 days after air-drying for 20 days. These seeds were used in a germination test. Seeds were germinated in four temperature conditions [35/15°C (alternate temperature), 35°C, 25°C, 15°C] and two light conditions (light, dark). Results of germination tests indicated that centipedegrass seeds had primary dormancy and that dormant seeds required high temperatures and light for germination. This primary dormancy is expected to be mild. Dormancy breaking of seeds can be advanced in air-dry conditions within days from harvest, but seeds stored in an air-dry conditions for about 100 days required light for germination. Chilling-wet conditions can accelerate dormancy breaking powerfully, and seeds treated in chilling-wet conditions lose their requirement of light for germination. In water absorption tests, centipedegrass seeds that had been soaked in water showed increased weight of more than 30%, these results indicate that seed coat of centipedegrass are permeable to water.
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