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首页> 外文期刊>Journal of Experimental Botany >The paramutated SULFUREA locus of tomato is involved in auxin biosynthesis
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The paramutated SULFUREA locus of tomato is involved in auxin biosynthesis

机译：番茄的变种SULFUREA基因座参与植物生长素的生物合成

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摘要

The tomato (Solanum lycopersicum) sulfurea mutation displays trans-inactivation of wild-type alleles in heterozygous plants, a phenomenon referred to as paramutation. Homozygous mutant plants and paramutated leaf tissue of heterozygous plants show a pigment-deficient phenotype. The molecular basis of this phenotype and the function of the SULFUREA gene (SULF) are unknown. Here, a comprehensive physiological analysis of the sulfurea mutant is reported which suggests a molecular function for the SULFUREA locus. It is found that the sulf mutant is auxin-deficient and that the pigment-deficient phenotype is likely to represent only a secondary consequence of the auxin deficiency. This is most strongly supported by the isolation of a suppressor mutant which shows an auxin overaccumulation phenotype and contains elevated levels of indole-3-acetic acid (IAA). Several lines of evidence point to a role of the SULF gene in tryptophan-independent auxin biosynthesis, a pathway whose biochemistry and enzymology is still completely unknown. Thus, the sulfurea mutant may provide a promising entry point into elucidating the tryptophan-independent pathway of IAA synthesis.
机译：番茄（Solanum lycopersicum）的硫磺突变显示杂合植物中野生型等位基因的反式失活，这种现象称为突变。纯合突变植物和杂合植物的突变叶片组织表现出色素缺乏的表型。该表型的分子基础和SULFUREA基因（SULF）的功能尚不清楚。在这里，报告了对sulteaea突变体的全面生理分析，这表明了SULFUREA基因座的分子功能。发现硫突变体是植物生长素缺乏的，并且色素缺乏表型可能仅代表植物生长素缺乏的次要结果。抑制因子突变体的分离最有力地支持了这一点，该突变体表现出一种生长素过度积累的表型，并且含有高水平的吲哚-3-乙酸（IAA）。几条证据表明SULF基因在不依赖色氨酸的植物生长素生物合成中的作用，该途径的生化和酶学仍完全未知。因此，硫磺突变体可能为阐明IAA合成的色氨酸非依赖性途径提供了一个有前途的切入点。

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