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首页> 外文期刊>Molecular Breeding >Involvement of a LhMYB18 transcription factor in large anthocyanin spot formation on the flower tepals of the Asiatic hybrid lily (Lilium spp.) cultivar 'Grand Cru'
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Involvement of a LhMYB18 transcription factor in large anthocyanin spot formation on the flower tepals of the Asiatic hybrid lily (Lilium spp.) cultivar 'Grand Cru'

机译：LHMYB18转录因子在亚洲杂交百合（百合SPP百合）的枝条花盆中大花青素斑层形成

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摘要

Large variations in anthocyanin color patterns are observed in flowers, especially in those of floricultural crops; however, mechanisms responsible for the pattern development are not yet fully understood. The Asiatic hybrid lily (Lilium spp.) cultivar "Grand Cru" has developed large anthocyanin spots on the interior surfaces of flower tepals, and such pigmentation patterns are rarely observed in other lily cultivars; this study evaluated mechanisms regulating large spot formation. As the expression of anthocyanin biosynthesis genes was coordinated in Grand Cru tepals, the transcriptional regulation of these genes should be responsible for large spot formation. Although LhMYB12 (subgroup 6 R2R3-MYB) often regulates anthocyanin biosynthesis in Asiatic hybrid lily tepals, LhMYB12 was not expressed in Grand Cru. Instead, Grand Cru expressed LhMYB15 like, LhMYB16, LhMYB17, and LhMYB18 (subgroup 6 R2R3-MYB) in tepals; among these, LhMYB18 was predominantly expressed in the red spot regions. Transient overexpression of both LhMYB18 and Lilium hybrid basic helix-loop-helix2 activated a lily dihydroflavonol 4-reductase gene promoter in tobacco leaves. Segregation of spot appearance and LhMYB18 expression in the F-1 population derived from crosses between Grand Cru and "Connecticut King," the latter was a cultivar without spots, showed that anthocyanin spots appeared in approximately one-quarter of the F-1 plants, and that high LhMYB18 expression was indispensable for spot formation. Thus, LhMYB18 is responsible for large spot formation. Results of the segregation analysis also indicate the involvement of an unidentified gene, which should affect the LhMYB18 expression, in spot development. These findings will advance the understanding of mechanisms regulating pattern development.
机译：在花中观察到花青素颜色图案的大变异，特别是在花卉作物的花卉中;然而，尚未完全理解负责模式开发的机制。亚洲杂交百合（Lilium SPP。）栽培品种“Grand Cru”在花Tepals的内表面上开发了大的花青素斑点，并且在其他百合品种中很少观察到这种色素沉着图案;该研究评估了调节大点形成的机制。由于在Grand Cru Tepals中协调了花青素生物合成基因的表达，因此这些基因的转录调节应负责大点形成。虽然LHMYB12（亚组6R2R3-MYB）经常调节Asiatic Hybrid Lily Tepals中的花青素生物合成，但LHMYB12未在Grand Cru中表达。相反，Grand Cru表示LHMYB15，LHMYB16，LHMYB17和LHMYB18（亚组6 r2R3-MYB）在TEPALS中;其中，LHMYB18主要在红点区域中表达。 LHMYB18和百合杂交碱性螺旋环 - HELIX2的瞬时过度表达在烟叶中活化百合二氢酚醇4-还原酶基因启动子。在Grand Cru与“康涅狄格王之王”之间的F-1群体中的现场外观和LHMYB18表达的偏析是一种没有斑点的品种，表明花青素斑点在大约四分之一的F-1植物中出现，并且该高LHMYB18表达对于点形成是必不可少的。因此，LHMYB18负责大点形成。分离分析的结果还表明了未识别的基因的累及，这应该影响LHMYB18表达，在现场发育中。这些调查结果将推动对调节模式开发机制的理解。

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