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首页> 外文期刊>The New Phytologist >Strigolactone signaling in the endodermis is sufficient to restore root responses and involves SHORT HYPOCOTYL 2 (SHY2) activity
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Strigolactone signaling in the endodermis is sufficient to restore root responses and involves SHORT HYPOCOTYL 2 (SHY2) activity

机译：内胚层中的Strigolactone信号转导足以恢复根反应，并涉及短HYPOCOTYL 2（SHY2）活性

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摘要

Strigolactones (SLs) are plant hormones and regulators of root development, including lateral root (LR) formation, root hair (RH) elongation and meristem cell number, in a MORE AXILLARY GROWTH 2 (MAX2)-dependent way. However, whether SL signaling is acting cell-autonomously or in a non-cell-autonomous way in roots is unclear. We analyzed root phenotype, hormonal responses and gene expression in multiple lines of Arabidopsis thaliana max2-1 mutants expressing MAX2 under various tissue-specific promoters and shy2 mutants. The results demonstrate for the first time that expression of MAX2 under the SCARECROW (SCR) promoter, expressed mainly in the root endodermis, is sufficient to confer SL sensitivity in the root for RH, LR and meristem cell number. Moreover, loss of function mutation of SHORT HYPOCOTYL 2 (SHY2), a key component in auxin and cytokinin regulation of meristem size, has been found to be insensitive to SLs in relation to LR formation and meristem cell number. Endodermal SL signaling, mediated by MAX2, is sufficient to confer SL sensitivity in root, and SHY2 may participate in SL signaling to regulate meristem size and LR formation. These SL signaling pathways thus may act through modulation of auxin flux in the root tip, and may indicate a root-specific, yet non-cell-autonomous regulatory mode of action.
机译：Strigolactones（SLs）是植物激素和根发育的调节剂，包括以更多腋窝生长2（MAX2）依赖的方式，包括侧根（LR）形成，根毛（RH）伸长和分生组织细胞数。但是，尚不清楚SL信号在根中是细胞自主发挥作用还是以非细胞自主发挥作用。我们分析了在各种组织特异性启动子和shy2突变体下表达MAX2的拟南芥max2-1突变体的多系中的根表型，激素反应和基因表达。结果首次证明，在SCARECROW（SCR）启动子下表达的MAX2主要在根部内胚层中表达，足以赋予根部SL对RH，LR和分生组织细胞数量的敏感性。此外，已发现短生长激素2（SHY2）的功能丧失是生长素和细胞分裂素调节分生组织大小的关键成分，与LR的形成和分生组织细胞数量有关，它对SL不敏感。由MAX2介导的内胚层SL信号传导足以赋予根部SL敏感性，SHY2可能参与SL信号传导以调节分生组织的大小和LR的形成。因此，这些SL信号传导途径可以通过调节根尖中的生长素通量来起作用，并且可以指示根特异性但非细胞自主的调节作用方式。

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