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A genetic network mediating the control of adventitious root formation in Populus ussuriensis

ABSTRACT: We identified coherent type 4 feed-forward loops (FFLs) from this ML-hGRN, where PuHox52 repressed the expression of PuHDA9, which in turn augmented the histone H3K9 acetylation around the proximal regions of three direct target genes of PuHox52, PuWRKY51, PuLBD21 and PuIAA7, resulting in further enhanced expression levels of these target genes. Our study manifests evidence that supports a ML-hGRN with at least three coherent type 4 FFLs governed AR formation process at basal ends of stem cuttings in poplar.

ORGANISM(S): Populus ussuriensis

PROVIDER: GSE133668 | GEO | 2020/06/18

REPOSITORIES: GEO

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Project description:Stem cuttings of P. trichocarpa (clone 101-74) were rooted in liquid medium without growth regulators (basal medium). The first emerging roots were observed on cuttings 6 days after the start of culture. The highest average root number per cutting (10 Â± 2 roots/cutting) was obtained after 14 days. The first macroscopic evidence of root initiation was the appearance of root primordia, as lateral bulges observed at the stem surface 3 to 4 days after transfer to basal medium. Stem cross-sections showed intensely dividing cells forming root primordial. One to two days later the bark split and the organized sequence of cell division and differentiation steps in the primordium led to the establishment of the main root tissues, as well as the vascular connections of the incipient root with the pre-existing stem vasculature. Subsequently, the outgrowth and emergence of the adventitious root occurred. We refer to the dormant cutting as stage 0, the organizing primordium as stage 1, the primordium differentiation as stage 2. To examine changes in gene transcription associated with the development of adventitious roots, we monitored the transcript levels in differentiating primordia using microarrays. cDNA was prepared from replicate sets of P. trichocarpa rooted cuttings harvested at stages 0, 1 and 2. The Populus whole-genome expression array version 2.0 manufactured by NimbleGen Systems Limited (Madison, WI) contains in duplicates three independent, non-identical, 60-mer probes per whole gene model plus control probes and labeling controls. Included in the microarray are 65,965 probe sets corresponding to 55,970 gene models predicted on the P. trichocarpa genome sequence version 1.0 and 9,995 aspen cDNA sequences (Populus tremula, Populus tremuloides, and P. tremula x P. tremuloides). NimbleGen whole genome microarray analyses were performed in triplicate as per manufacturers instructions. We carried out nine hybridizations (NimbleGen) with samples derived from three early developmental stages of P. trichocarpa adventitious roots. cDNA was synthesized using CLONTECH Smart cDNA Synthesis kit containing an amplification step on the cDNA level. All samples were labeled with Cy3.

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A genetic network mediating the control of adventitious root formation in Populus ussuriensis

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