Effects of Various Treatments on Breaking Hard Seed Dormancy of Calystegia soldanella(L.) Roem. et Schult.

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  • ハマヒルガオ（Ｃａｌｙｓｔｅｇｉａ　ｓｏｌｄａｎｅｌｌａ（Ｌ．）　Ｒｏｅｍ．　ｅｔ　Ｓｃｈｕｌｔ．）種子の硬実休眠と濃硫酸などによる休眠打破処理の効果
  • ハマヒルガオ Calystegia soldanella L Roem et Schult シュシ ノ コウジツ キュウミン ト ノウリュウサン ナド ニ ヨル キュウミン ダハ ショリ ノ コウカ

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Calystegia soldanella Roem. et Schult. is considered as a useful species for landscaping in coastal areas to provide both aesthetic and naturalistic effects. So, we investigated the various methods for breaking seed dormancy of this species.<BR>Seeds were placed in petri dishes and germinated in an incubator. Few of the untreated seeds germinated at any temperature regime on any lighting conditions. This held true regardless of location, time of seed collection, or duration of seed storage. As absorption did not occur in seeds that had not germinated, seeds did not swell, thus they were considered to have hard coats. The seeds that were scarified with emery paper, pricked with needles and soaked in 96% sulphuric acid had a germination rate over 70%. Sulphuric treatment was the most efficient. Sulphuric acid treatment caused cracking or holing initially near the hilum region and later caused holing extensively over the seed coat.<BR>Such access allows water absorption and germination. Although the effect of sulphuric treatment fluctuated, depending on location and time of seed collection, it is found that about 80% of seeds can germinate within 30 days after sowing when treated with sulphuric acid for 60-120 min.

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