胚根，指的是胚的下部未发育的根。
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大豆的根系包括由胚根形成的主根。
The root system of the soybean consists of a taproot formed by the radicle.
根和根冠被一鞘状结构，即胚根鞘所覆盖。
Both root and root cap are covered by a sheath-like structure called the coleorhiza.
水分胁迫明显抑制了胚芽鞘和主胚根的生长。
Water stress obviously restrain growth of coleoptile and main radical.
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