生长素
查尔酮合酶
拟南芥
生长素极性运输
向重力性
生物化学
生物
拟南芥
柚皮素
植物激素
类黄酮生物合成
化学
细胞生物学
突变体
类黄酮
生物合成
基因
基因表达
转录组
抗氧化剂
作者
Dana Brown,Aaron M. Rashotte,Angus Murphy,Jennifer Normanly,Brian W. Tague,Wendy Ann Peer,Lincoln Taiz,Gloria K. Muday
出处
期刊:Plant Physiology
[Oxford University Press]
日期:2001-06-01
卷期号:126 (2): 524-535
被引量:738
摘要
Abstract Polar transport of the plant hormone auxin controls many aspects of plant growth and development. A number of synthetic compounds have been shown to block the process of auxin transport by inhibition of the auxin efflux carrier complex. These synthetic auxin transport inhibitors may act by mimicking endogenous molecules. Flavonoids, a class of secondary plant metabolic compounds, have been suggested to be auxin transport inhibitors based on their in vitro activity. The hypothesis that flavonoids regulate auxin transport in vivo was tested in Arabidopsis by comparing wild-type (WT) and transparent testa (tt4) plants with a mutation in the gene encoding the first enzyme in flavonoid biosynthesis, chalcone synthase. In a comparison between tt4 and WT plants, phenotypic differences were observed, including three times as many secondary inflorescence stems, reduced plant height, decreased stem diameter, and increased secondary root development. Growth of WT Arabidopsis plants on naringenin, a biosynthetic precursor to those flavonoids with auxin transport inhibitor activity in vitro, leads to a reduction in root growth and gravitropism, similar to the effects of synthetic auxin transport inhibitors. Analyses of auxin transport in the inflorescence and hypocotyl of independent tt4 alleles indicate that auxin transport is elevated in plants with a tt4mutation. In hypocotyls of tt4, this elevated transport is reversed when flavonoids are synthesized by growth of plants on the flavonoid precursor, naringenin. These results are consistent with a role for flavonoids as endogenous regulators of auxin transport.
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