The part of the stem of an embryo plant beneath the stalks of the seed leaves, or cotyledons, and directly above the root.
- A wide variety of organs from various plant species were analysed: roots, stems, hypocotyls, leaves, fruits, and petioles.
- In wild-type Arabidopsis plants, the roots, hypocotyls, and inflorescence stems exhibit gravitropic bending.
- Callus was formed on cotyledons, hypocotyls, and radicles of embryos.
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