Effects of light and temperature on the germination of alien <i>Physalis</i> spp.

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  • Ohmori Ayako
    Graduate School of Agriculture, Kyoto University Present address: Chutanhigashi Agriculture Extension Center
  • Tsuji Kousuke
    Kyoto Prefectural Agriculture Forestry and Fisheries Technology Center Agriculture and Forestry Technology Department Present address: Kyoto Prefecture Department of Agriculture, Forestry and Fisheries, Agricultural Industry Division
  • Sugimoto Mitsuru
    Kyoto Prefectural Agriculture Forestry and Fisheries Technology Center Agriculture and Forestry Technology Department
  • Tominaga Tohru
    Graduate School of Agriculture, Kyoto University

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Other Title
  • 外来フウリンホオズキ類の発芽に及ぼす光および温度の影響
  • ガイライ フウリンホオズキルイ ノ ハツガ ニ オヨボス ヒカリ オヨビ オンド ノ エイキョウ

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Abstract

<p>In Kyoto Prefecture, Physalis angulata L. var. angulata and P. angulata var. lanceifolia (Nees) Waterfall spread rapidly in the red beans fields and cause a reduction in its yield and quality. We studied the effect of light, temperature, and chilling treatment on seed germination of the two Physalis spp. obtained from a red bean field. The germination rate of fresh seeds of P. angulata var. lanceifolia was 15% or higher at alternating temperatures of 25/15°C, 30/20°C, and 35/25°C under both light and dark conditions, whereas that of P. angulata var. angulata was less than 5%. Furthermore, the germination rate of P. angulata var. lanceifolia seeds stored in the open air was less than 5% under dark condition and constant temperature condition. However, the germination rate of P. angulata var. angulata seeds stored in the open air was 28.9% to 93.3% at alternating temperatures of 25/15°C, 30/20°C, and 35/25°C, and 6.6% to 92% at constant temperatures of 20°C, 25°C, and 30°C. Following chilling treatment under light conditions and dark and wet conditions, P. angulata var. angulata seeds exhibited higher germination rates than P. angulata var. lanceifolia. This shows that the environmental requirements for dormancy release after seed dispersal of the two species are different.</p>

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