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• W3172584046 abstract "Abstract Background Breadfruit ( Artocarpus altilis ) is a traditional staple tree crop throughout the tropics. Through interspecific grafting, a dwarf phenotype with over 50% reduction in plant height was identified when marang ( Artocarpus odoratissimus ) rootstocks were used. However, the molecular mechanism underlying the rootstock-induced breadfruit dwarfing is poorly understood. Results An RNA-sequencing study of breadfruit scions at 22 months after grafting identified 5409 differentially expressed genes (DEGs) of which 2069 were upregulated and 3339 were downregulated in scion stems on marang rootstocks compared to those on self-graft. The DEGs were predominantly enriched for biological processes involved in carbon metabolism, cell wall organization, plant hormone signal transduction and redox homeostasis. The down-regulation of genes encoding vacuolar acid invertases and alkaline/neutral invertases, was consistent with the decreased activity of both enzymes, accompanying with a higher sucrose but lower glucose and fructose levels in the tissues. Key genes of biosynthetic pathways for amino acids, lipids and cell wall were down regulated, reflecting reduction of sucrose utilisation for stem growth on dwarfing rootstocks. Genes encoding sugar transporters, amino acid transporters, choline transporters, along with large number of potassium channels and aquaporin family members were down-regulated in scion stems on marang rootstocks. Lower activity of plasma membrane H + -ATPase, together with the predominance of genes encoding expansins, wall-associated receptor kinases and key enzymes for biosynthesis and re-modelling of cellulose, xyloglucans and pectins in down-regulated DGEs suggested impairment of cell expansion. Signalling pathways of auxin and gibberellin, along with strigolacton and brassinosteroid biosynthetic genes dominated the down-regulated DEGs. Phenylpropanoid pathway was enriched, with key lignin biosynthetic genes down-regulated, and flavonoid biosynthetic genes upregulated in scions on marang rootstocks. Signalling pathways of salicylic acid, jasmonic acid, ethylene and MAPK cascade were significantly enriched in the upregulated DEGs. Conclusions Rootstock-induced disruption in pathways regulating nutrient transport, sucrose utilisation, cell wall biosynthesis and networks of hormone transduction are proposed to impair cell expansion and stem elongation, leading to dwarf phenotype in breadfruit scions. The information provides opportunity to develop screening strategy for rootstock breeding and selection for breadfruit dwarfing." @default.
• W3172584046 created "2021-06-22" @default.
• W3172584046 creator A5019643045 @default.
• W3172584046 creator A5085427885 @default.
• W3172584046 date "2021-06-05" @default.
• W3172584046 modified "2023-10-10" @default.
• W3172584046 title "Differential transcription pathways associated with rootstock-induced dwarfing in breadfruit (Artocarpus altilis) scions" @default.
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• W3172584046 doi "https://doi.org/10.1186/s12870-021-03013-6" @default.
• W3172584046 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8178858" @default.
• W3172584046 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34090350" @default.
• W3172584046 hasPublicationYear "2021" @default.
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