生长素的侧向再分配能解释玉米中胚轴的向光性吗？
Can lateral redistribution of auxin account for phototropism of maize coleoptiles?
机构信息
Carnegie Institution of Washington, Department of Plant Biology, Stanford, California 94305.
出版信息
Plant Physiol. 1986 May;81(1):306-9. doi: 10.1104/pp.81.1.306.
Abstract
Elongation growth of intact, red-light grown maize (Zea mays L.) coleoptiles was studied by applying a small spot of an indole acetic acid (IAA)-lanolin mixture to the coleoptile tip. We report that: (a) endogenous auxin is limiting for growth, (b) an approximately linear relation holds between auxin concentration and growth rate over a range which spans those rates occurring in phototropism, and (c) an auxin gradient established at the coleoptile tip is well sustained during its basipetal transport. We argue that the growth differential underlying coleoptile phototropism (first-positive curvature) can be explained by redistribution of auxin at the coleoptile tip.
摘要
用含有吲哚乙酸（IAA）的羊毛脂小斑点处理玉米（Zea mays L.）完整的红光下生长的胚芽鞘的顶端，研究其伸长生长。我们的报告指出：（a）内源生长素限制了生长；（b）在跨越向光性发生的速率范围时，生长素浓度与生长速率之间呈近似线性关系；（c）在向基运输过程中，胚芽鞘顶端建立的生长素梯度能很好地维持。我们认为，向光性（正向第一曲率）下胚芽鞘生长的差异可以通过生长素在胚芽鞘顶端的再分配来解释。
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本文引用的文献
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