Department of Botany, University of Southampton, UK.
Planta. 1972 Jun;107(2):171-82. doi: 10.1007/BF00387722.
When small colonies of the pea aphid [Acyrthosiphon pisum (Harris)] were established on the stem of Meteor Dwarf Pea seedlings (Pisum sativum L.), (14)C was found in the honeydew 4.5 h after applying IAA-1-(14)C to a fully-expanded foliage leaf. In contrast, no activity was found in the honeydew or aphids 4.5 h after the application of IAA-1-(14)C to the intact apical bud even though the internode upon which the aphids were feeding contained high levels of (14)C. The lack of radio-activity in aphids feeding on stems to which IAA-1-(14)C was applied via the apical bud was found not to be influenced by the internode position or by the transport interval allowed (up to 24 h).Radioactivity derived from either foliar or apical applications of IAA-1-(14)C was not transported through stem tissues killed by heat treatment. Xylem function was shown not to be impared by the heat treatment employed.It was concluded that the long-distance transport of IAA from the apical bud of intact pea seedlings does not take place in the phloem sieve tubes involved in the transport of metabolites from foliage leaves, or in the non-living tissues of the xylem.
当小豌豆蚜（Acyrthosiphon pisum（Harris））殖民地建立在 Meteor 矮豌豆幼苗（Pisum sativum L.）的茎上时，在将 IAA-1-（14）C 应用于完全展开的叶子 4.5 小时后，在蜜露中发现了（14）C。相比之下，即使在蚜虫进食的节间含有高水平的（14）C，在将 IAA-1-（14）C 应用于完整的顶芽后 4.5 小时，在蜜露或蚜虫中均未发现活性。发现通过顶芽向茎施用 IAA-1-（14）C 后，取食茎的蚜虫中缺乏放射性，这并不是由节间位置或允许的运输间隔（长达 24 小时）影响的。无论从叶片还是顶芽施用 IAA-1-（14）C 获得的放射性物质都不会通过热处理杀死的茎组织运输。木质部功能的研究表明，热处理不会损害所采用的木质部功能。因此得出结论，完整的豌豆幼苗顶芽中的 IAA 长距离运输不会发生在参与从叶片运输代谢物的韧皮部筛管中，也不会发生在木质部的无生命组织中。
