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Title: Arabidopsis HOG1 gene and its petunia homolog PETCBP act as key regulators of yield parameters
Authors: Godge, M.R. 
Kumar, D.
Kumar, P.P. 
Keywords: Antisense suppression
Apical dominance
Cytokinin binding protein
Increased biomass
Plant hormones
Transgenic petunia
Yield enhancement
Issue Date: Sep-2008
Citation: Godge, M.R., Kumar, D., Kumar, P.P. (2008-09). Arabidopsis HOG1 gene and its petunia homolog PETCBP act as key regulators of yield parameters. Plant Cell Reports 27 (9) : 1497-1507. ScholarBank@NUS Repository.
Abstract: Plant hormones influence the key parameters that contribute to crop yield, including biomass, branching and seed number. We tested manipulation of cytokinin signaling as an avenue for influencing these growth parameters. Here we report a full-length cDNA coding for a cytokinin binding protein, Petunia cytokinin binding protein (PETCBP) from Petunia hybrida cv. Mitchell. PETCBP encodes for a protein that exhibits high sequence similarity to S-adenosyl-l-homocysteine hydrolase (SAHH). Transgenic petunia plants expressing this gene in antisense orientation displayed profuse branching, delayed flowering and delayed shoot bud induction from leaf explants in vitro. Homologs were also isolated from Arabidopsis thaliana homology-dependent gene silencing 1 (HOG1) and Orzya sativa (OsCBP). Arabidopsis HOG1 showed high affinity cytokinin binding activity and modified plant architecture similar to PETCBP. Transgenic Arabidopsis plants overexpressing HOG1 showed early flowering with a significantly reduced plant biomass and number of leaves. In contrast, profuse branching, delayed flowering, increased leaf size and higher seed yield were the major phenotypes observed in the antisense suppression lines. These results suggest that genetic manipulation of this cytokinin binding protein or its orthologs could be used for improving crop biomass and seed yield. © 2008 Springer-Verlag.
Source Title: Plant Cell Reports
ISSN: 07217714
DOI: 10.1007/s00299-008-0576-z
Appears in Collections:Staff Publications

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