Experiments on the effects of Soil depth and sunlight transmitted through a leaf on seed germination of the wild plant <i>Plantago virginica</i> L.

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  • 野草ツボミオオバコ種子の光発芽に及ぼす土の深さと葉を透過した太陽光の影響に関する実験
  • ヤソウ ツボミオオバコ シュシ ノ ヒカリ ハツガ ニ オヨボス ツチ ノ フカサ ト ハ オ トウカ シタ タイヨウコウ ノ エイキョウ ニ カンスル ジッケン

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<p>In this paper, an experimental study on the effects of light conditions in natural environment on the seed germination of Plantago virginica L. is described. The study found that germination occurred in the majority of seeds that had been buried in a thin layer of soil (2.5mm in depth) under ariticial illumination. In terms of light exposure, seed germination from the soil surface layer was suppressed by of irradiation of sunlight transmitted through the green leaf of an Indian rubber tree for 3 minutes. However, the germination was not suppresed by sunlight transmitted through the rubber tree’s albino leaf, nor through a yellowish or dead banana leaf. Through such experiments, it can be suggested to students that under a green leaf canopy, transmitted sunlight includes far-red light at a higher ratio which suppresses the germination of photoblastic seeds. Such experiments will contribute to better student understanding of plant life and light action in a natural environment.</p>

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