Effects of 17 Alpha-Ethinylestradiol, Norethindrone, and Levonorgestrel on Root Growth of Arabidopsis Thaliana

    January 2006 in “ Xibei zhiwu xuebao ”
    Kai Xia
    TLDR Norethindrone and levonorgestrel can enhance or inhibit root growth in Arabidopsis thaliana depending on the concentration.
    The study investigated the effects of 17 α-ethinylestradiol, norethindrone, and levonorgestrel on the root growth of Arabidopsis thaliana seedlings. Norethindrone at 30 μg·L~(-1) significantly promoted taproot growth and increased lateral root number and length, while 17 α-ethinylestradiol at 3,000 μg·L~(-1) caused taproot bending. Norethindrone was most effective at 300 μg·L~(-1), enhancing taproot length and lateral root development, but at 3,000 μg·L~(-1), it inhibited root-hair growth. Levonorgestrel was highly active, promoting taproot and root-hair growth at 3 μg·L~(-1), and at 300 μg·L~(-1), it increased lateral root number and root hair density. However, at 3,000 μg·L~(-1), it inhibited taproot and lateral root growth.
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