Program in Cellular and Molecular Biology, University of Miami School of Medicine, Miami, Florida 33136.
Plant Physiol. 1967 Mar;42(3):415-20. doi: 10.1104/pp.42.3.415.
Low concentrations of indole-3-acetic acid inhibit the growth of pea root sections by inducing the formation of the growth regulator, ethylene gas. Ethylene is produced within 15 to 30 minutes after indole-3-acetic acid is applied and roots begin to swell immediately after they are exposed to the gas. Carbon dioxide competitively inhibits ethylene action in roots, impedes their geotropic response, and partially reinstates auxin inhibited growth. It is concluded that ethylene participates in the geotropic response of roots, but not that of stems.
低浓度的吲哚乙酸通过诱导生长调节剂乙烯气体的形成来抑制豌豆根切段的生长。在施加吲哚乙酸后 15 至 30 分钟内会产生乙烯，并且根在暴露于该气体后立即开始肿胀。二氧化碳在根中竞争性抑制乙烯作用，阻碍其向地性反应，并部分恢复生长素抑制的生长。结论是，乙烯参与根的向地性反应，但不参与茎的向地性反应。
