Auxin is required for leaf vein pattern in Arabidopsis

被引:232
作者
Sieburth, LE
机构
[1] McGill Univ, Dept Biol, Montreal, PQ H3A 1B1, Canada
[2] Univ Utah, Dept Biol, Salt Lake City, UT 84112 USA
关键词
D O I
10.1104/pp.121.4.1179
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
To investigate possible roles of polar auxin transport in vein patterning, cotyledon and leaf vein patterns were compared for plants grown in medium containing polar auxin transport inhibitors (N-1-naphthylphthalnmic acid, 9-hydroxyfluorene-9-carboxylic acid, and 2,3,5-triiodobenzoic acid) and in medium containing a less well-characterized inhibitor of auxin-mediated processes, 2-(p-chlorophynoxy)-2-methylpropionic acid. Cotyledon vein pattern was not affected by any inhibitor treatments, although vein morphology was altered. In contrast, leaf vein pattern was affected by inhibitor treatments. Growth in polar auxin transport inhibitors resulted in leaves that lacked vascular continuity through the petiole and had broad, loosely organized midveins, an increased number of secondary veins, and a dense band of misshapen tracheary elements adjacent to the leaf margin. Analysis of leaf vein pattern developmental time courses suggested that the primary vein did not develop in polar auxin transport inhibitor-grown plants, and that the broad midvein observed in these seedlings resulted from the coalescence of proximal regions of secondary veins. Possible models for leaf vein patterning that could account for these observations are discussed.
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收藏
页码:1179 / 1190
页数:12
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