The modified flavonol glycosylation profile in the Arabidopsis rol1 mutants results in alterations in plant growth and cell shape formation
The modified flavonol glycosylation profile in the Arabidopsis rol1 mutants results in alterations in plant growth and cell shape formation
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DOI：
10.1105/tpc.107.053249
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发表时间：
2008-06-01
期刊：
影响因子：
11.6
通讯作者：
Klein, Markus
中科院分区：
文献类型：
--
作者：
Ringli, Christoph;Bigler, Laurent;Klein, Markus
黄酮类化合物是已知调节植物生长和发育的次生代谢物。黄酮醇是类黄酮的一个亚类，其主要功能被认为是改变植物中的生长素通量。黄酮醇在细胞中是糖基化的，和阻遏物的Irx 1（rol 1）突变体的拟南芥，在鼠李糖的生物合成的影响，有一个修改的黄酮醇糖基化配置文件。rol 1 -2等位基因的详细分析揭示了生长迟缓，异常的铺路细胞和气孔形态的子叶，和有缺陷的毛状体形成。阻断类黄酮的生物合成抑制了rol 1 -2芽表型，这表明它是由修改后的黄酮醇配置文件。rol 1 -2的低分化子叶可能是黄酮醇诱导的生长素浓度增加的结果。相比之下，路面细胞，气孔，和毛状体形成表型似乎不是由修改后的生长素分布诱导。总之，这些结果表明，黄酮醇组成的变化可以通过生长素诱导和生长素独立的过程对植物发育产生巨大的影响。
Flavonoids are secondary metabolites known to modulate plant growth and development. A primary function of flavonols, a subgroup of flavonoids, is thought to be the modification of auxin fluxes in the plant. Flavonols in the cell are glycosylated, and the repressor of Irx1 (rol1) mutants of Arabidopsis thaliana, affected in rhamnose biosynthesis, have a modified flavonol glycosylation profile. A detailed analysis of the rol1-2 allele revealed hyponastic growth, aberrant pavement cell and stomatal morphology in cotyledons, and defective trichome formation. Blocking flavonoid biosynthesis suppresses the rol1-2 shoot phenotype, suggesting that it is induced by the modified flavonol profile. The hyponastic cotyledons of rol1-2 are likely to be the result of a flavonol-induced increase in auxin concentration. By contrast, the pavement cell, stomata, and trichome formation phenotypes appear not to be induced by the modified auxin distribution. Together, these results suggest that changes in the composition of flavonols can have a tremendous impact on plant development through both auxin-induced and auxin-independent processes.