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汉语拼音：pēi zhóu

植物胚的组成部分之一，是连接幼茎和胚根的部分，在子叶的下面和幼根的上面。

• Such seedlings are characterized by having elongated hypocotyls or epicotyls.

  这样的幼苗具有伸长的下胚轴或上胚轴的特征.

• At the onset of germination, the hypocotyl elongates rapidly by cell enlargement.

  萌发开始时, 下胚轴依靠细胞增大而迅速伸长.

• It was found that calcium reduced elongation of cucumber hypocotyls.

  有人发现,钙能抑制黄瓜胚轴的伸长.

• As the development of the hypocotyl continues, the characteristic crook in the upper portion becomes apparent.

  由于下胚轴继续发音, 上部特有的弯曲变得明显.

• When hypocotyl emerges out of the seed coat for 1 - 2 mm.

  当下胚轴穿出种皮约1—2毫米时,生毛细胞的外壁向外突出,形成下胚轴毛.

• Rape have established regeneration system of cotyledons, hypocotyls, protoplasts and microspore culture.

  油菜已经建立了子叶 、 胚轴 、 原生质体及小孢子培养的再生体系.

• The results shew that hypocotyl's velocity, quality and differentiation were better than other explants.

  结果表明:外植体为胚轴出愈速度快 、 质量好且分化率高.

• Among cotyledon , petiole of cotyledon, hypocotyl, and radicle, hypocotyl has the most responsive explants to 2, 4 - D .

  在子叶 、 叶柄 、 胚轴以及胚根四者当中, 下胚轴对2, 4-D 的反应状况最好.