核酸抗代谢物对莴苣种子萌发和幼苗生长的抑制作用，以及核酸前体和赤霉素的逆转作用。

Inhibition of lettuce seed germination and seedling growth by antimetabolites of nucleic acids, and reversal by nucleic acid precursors and gibberellic acid.

机构信息

Department of Biochemistry, Michigan State University, E. Lansing, Michigan, USA.

出版信息

Planta. 1966 Mar;68(1):83-7. doi: 10.1007/BF00385373.

Abstract

Germination of White Paris lettuce seeds is inhibited by 2-thiouracil up to 24 hours. This inhibition is reversed by RNA precursors only. Seedling growth of lettuce is inhibited by 2-thiouracil and 5-fluorouracil; and white the effect of 2-thiouracil is counteracted by RNA precursors, inhibition due to 5-fluorouracil is not reversed significantly by any nucleic acid precursors. Possibly 2-thiouracil controls germination and seedling growth by interfering with RNA synthesis, while the effect of 5-fluorouracil is non-specific.In the presence of gibberellic acid, 5-fluorouracil and 2-thiouracil are relatively ineffective in causing inhibition of hypocotyl growth. Mechanism of gibberellic acid action remains obscure.

摘要

2-硫代尿嘧啶对巴黎白莴苣种子的发芽有抑制作用，其抑制作用可持续 24 小时。这种抑制作用只能被 RNA 前体逆转。2-硫代尿嘧啶和 5-氟尿嘧啶抑制莴苣幼苗生长；而 2-硫代尿嘧啶的作用可以被 RNA 前体逆转，但 5-氟尿嘧啶的抑制作用不能被任何核酸前体显著逆转。2-硫代尿嘧啶可能通过干扰 RNA 合成来控制种子的发芽和幼苗的生长，而 5-氟尿嘧啶的作用则是非特异性的。在赤霉素存在的情况下，5-氟尿嘧啶和 2-硫代尿嘧啶在抑制下胚轴生长方面的效果相对较差。赤霉素作用的机制仍然不清楚。