Instituto de Ecología, Universidad Nacional Autónoma de México, Ciudad Universitaria CP. 04510, Ciudad de México, México.
Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria CP. 04510, Ciudad de México, México.
J Plant Physiol. 2018 Dec;231:105-109. doi: 10.1016/j.jplph.2018.09.006. Epub 2018 Sep 17.
Auxin is involved in hypocotyl elongation in response to different environmental factors. BIIDXI is a cell wall DUF642 protein that participates in the regulation of the degree of pectin-methylesterification of the cell wall in different tissues, including hypocotyls. Under continuous light, bdx-1 seedlings presented longer hypocotyls than those of WT, while BIIDXI-overexpressed hypocotyls were auxin resistant. Auxin accumulation was observed in epidermal cells from bdx-1 hypocotyls, and the distribution pattern of PIN1 proteins differed. Moreover, the gravitropic response of bdx-1, a process that is highly dependent on auxin flux, was increased. In this study, we determined that BIIDXI is involved in hypocotyl elongation through the regulation of auxin flux.
生长素参与了对不同环境因子的下胚轴伸长反应。BIIDXI 是一种细胞壁 DUF642 蛋白，参与不同组织（包括下胚轴）中细胞壁果胶甲酯化程度的调节。在连续光照下，bdx-1 幼苗的下胚轴比 WT 长，而 BIIDXI 过表达的下胚轴对生长素具有抗性。在 bdx-1 下胚轴的表皮细胞中观察到生长素的积累，PIN1 蛋白的分布模式也不同。此外，bdx-1 的向重力性反应（高度依赖于生长素流）增加了。在这项研究中，我们确定 BIIDXI 通过调节生长素流参与了下胚轴伸长。
