Department of Life Sciences and Doris and Bertie Black Center for Bioenergetics in Life Sciences, Ben-Gurion University, Beer-Sheva, Israel.
Plant Signal Behav. 2011 May;6(5):694-6. doi: 10.4161/psb.6.5.14978. Epub 2011 May 1.
We have recently demonstrated that the transcription factor ABSCISIC ACID INSENSITIVE 4 (ABI4) mediates abscisic acid and cytokinin inhibition of lateral root formation by reducing polar auxin transport in Arabidopsis thaliana. ( 1) In that study, we provided a direct demonstration of ABI4 expression in phloem companion cells and parenchyma of the vascular system in the mature regions of the roots. Although also studied in mature plants, ABI4 has been studied primarily in germinating seedlings, and its expression has been assumed by some researchers to be restricted to early germination stages. We thus constructed transgenic Arabidopsis plants expressing an ABI4:GUS construct, and followed ABI4 promoter activity during seedling development, focusing on the roots.
我们最近证明,转录因子脱落酸不敏感 4(ABI4)通过减少拟南芥中极性生长素的运输来介导脱落酸和细胞分裂素对侧根形成的抑制作用。(1)在该研究中,我们直接证明了 ABI4 在根成熟区的韧皮部伴胞和维管束组织中的表达。尽管在成熟植物中也进行了研究,但 ABI4 主要在萌发的幼苗中进行了研究,一些研究人员认为其表达仅限于早期萌发阶段。因此,我们构建了表达 ABI4:GUS 构建体的转基因拟南芥植物,并在幼苗发育过程中(重点是根)跟踪 ABI4 启动子活性。