Effects of Temperature, Light, Burial and Storage on Germination of <I>Calystegia soldanella</I> Seeds Released from Dormancy

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  • 硬実休眠が解除されたハマヒルガオ種子の発芽に及ぼす, 温度, 光, 埋土そして貯蔵の影響
  • Effects of Temperature Light Burial and Storage on Germination of Calystegia soldanella Seeds Released from Dormancy

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Abstract

In this paper we deal with the germination requirements of Calystegia soldanella seeds released from hard seed coat dormancy for the purpose of landscape creation in the coastal dune areas and for the preservation of the species.<BR>Effects of temperature, light, burial in sand and storage on the germination of the seeds released from dormancy were tested in an incubator.<BR>Seeds that are released from dormancy with 36 N sulfuric acid show a 81-95 germination rate from 10 to 30°C within 30 days of sowing. Mean germination time is, however, reduced at 25-30°C and increased markedly at 10°C. Light or dark conditions did not affect these germination temperature characteristics.<BR>Seeds released from dormancy were placed on a sand surface resulted in germination of 38% since they could not absorb sufficient water due to evaporation from the seed surface. However, final germination percentages of seeds buried to depth of 0.5-6 cm in sand reached 73-86%. The deeper the burial depth, the longer the mean germination time. Seeds released from dormancy kept 80-95% germination from 0 to 360 days after storage. Germination of untreated seeds, which have dormancy, however, showed only 9% after 360 days of storage.

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