Department of Plant Sciences, Texas Agricultural Experiment Station, Texas A&M University, College Station, Texas 77843.
Plant Physiol. 1979 Jan;63(1):152-5. doi: 10.1104/pp.63.1.152.
Movement of [(14)C]kinetin and [(14)C]gibberellic acid was examined in cotton (Gossypium hirsutum L.) cotyledonary petiole sections independent of label uptake or exit from the tissue. Sections 20 millimeters in length were taken from well watered, stressed, and poststressed plants. Transport capacity was determined using a pulse-chase technique. Movement of both kinetin and gibberellic acid was found to be nonpolar with a velocity of 1 millimeter per hour or less, suggesting passive diffusion. Neither water stress nor anaerobic conditions during transport of labeled material affected the transport capacity of the petioles.Results suggested strong kinetin binding but weak gibberellic acid binding in the tissue sections. Apparent binding of both growth regulators was unaltered by the experimental conditions. Movement of these two growth regulators within cotton cotyledonary petioles plays a minor role in the stress-induced, foliar abscission process.
（14）C 激动素和（14）C 赤霉素在棉（Gossypium hirsutum L.）子叶叶柄切片中的运动是在不考虑标记物进入或离开组织的情况下进行研究的。从充分浇水、胁迫和胁迫后植物上切下 20 毫米长的切片。使用脉冲追踪技术测定运输能力。发现激动素和赤霉素的运动都是非极性的，速度为每小时 1 毫米或更慢，表明是被动扩散。在标记物质运输过程中，水胁迫或厌氧条件均不影响叶柄的运输能力。结果表明，组织切片中存在强烈的激动素结合，但赤霉素结合较弱。这两种生长调节剂的明显结合不受实验条件的影响。这两种生长调节剂在棉子叶叶柄内的运动在胁迫诱导的叶片脱落过程中作用较小。
