Effects of Soil Media and their Particle Size on the Growth and Curvature of Seminal Roots of Zea mays L. seedlings

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  • 培地土壌の種類と埴土の粒径がトウモロコシの種子根の屈曲生長に及ぼす影響
  • 培地土壌の種類と埴土の粒径がトウモロコシの種子根の屈曲生長に及ぼす影響(短報)
  • バイチ ドジョウ ノ シュルイ ト ショクド ノ リュウケイ ガ トウモロコシ

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Two pot experiments were conducted to find out whether soil media and soil particle size could affect the growth and curvature of seminal roots of Zea mays L. seedlings. In experiment 1, seeds of cv. Great Bell were germinated and the young seedlings with straight seminal roots 30±1mm in length were collected. Tops were cut off at mesocotyl and transplanted to 1/5, 000 a plastic pots filled with moistened clay soil with different soil particle sizes ; 0.59-0.84mm, 0.84-2.38mm, 2.38-4.76mm, 4.76mm and over. Seedlings were covered with a thin layer of clay soil and grown in controlled room at 22+1℃ under darkness for 96 hours. In experiment 2, clay soil-screened through a riddle of 1cm, sand and vermiculite were used as soil media. Preparation of seedlings and growing condition were same as experiment 1. Decapped plots were added in this experiment by removing the root caps of the seminal roots of the seedlings. In experiment 1 roots grew more and fewer roots curved in the clay media of larger particle size than in those of the smaller size. In experiment 2 roots grew most with few curved roots in vermiculite as compared to those in other media, suggesting that the roots are sensitive to the hardness of root media. Decapped roots grew less than control roots in all three media examined and curved in clay or sand, in contrast to the straight growth in vermiculite.

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