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dc.contributor.authorBaysal, Can
dc.contributor.authorHe, Wenshu
dc.contributor.authorDrapal, Margit
dc.contributor.authorVillorbina Noguera, Gemma
dc.contributor.authorMedina Piles, Vicente
dc.contributor.authorCapell Capell, Teresa
dc.contributor.authorKhush, Gurdev S.
dc.contributor.authorZhu, Changfu
dc.contributor.authorFraser, Paul
dc.contributor.authorChristou, Paul
dc.date.accessioned2020-10-28T10:07:36Z
dc.date.available2021-04-06T22:27:50Z
dc.date.issued2020-10-05
dc.identifier.issn0027-8424
dc.identifier.urihttp://hdl.handle.net/10459.1/69729
dc.description.abstractStarch properties can be modified by mutating genes responsible for the synthesis of amylose and amylopectin in the endosperm. However, little is known about the effects of such targeted modifications on the overall starch biosynthesis pathway and broader metabolism. Here we investigated the effects of mutating the OsSBEIIb gene encoding starch branching enzyme IIb, which is required for amylopectin synthesis in the endosperm. As anticipated, homozygous mutant plants, in which OsSBEIIb was completely inactivated by abolishing the catalytic center and C-terminal regulatory domain, produced opaque seeds with depleted starch reserves. Amylose content in the mutant increased from 19.6 to 27.4% and resistant starch (RS) content increased from 0.2 to 17.2%. Many genes encoding isoforms of AGPase, soluble starch synthase, and other starch branching enzymes were up-regulated, either in their native tissues or in an ectopic manner, whereas genes encoding granule-bound starch synthase, debranching enzymes, pullulanase, and starch phosphorylases were largely down-regulated. There was a general increase in the accumulation of sugars, fatty acids, amino acids, and phytosterols in the mutant endosperm, suggesting that intermediates in the starch biosynthesis pathway increased flux through spillover pathways causing a profound impact on the accumulation of multiple primary and secondary metabolites. Our results provide insights into the broader implications of perturbing starch metabolism in rice endosperm and its impact on the whole plant, which will make it easier to predict the effect of metabolic engineering in cereals for nutritional improvement or the production of valuable metabolites.
dc.description.sponsorshipWe would like to acknowledge funding from Ministry of Economy and Competitiveness, Spain (RTI2018-097613-BI00 to C.Z., PGC2018-097655-B-I00 to P.C., and AGL2017-85377-R to T.C.); Generalitat de Catalunya Grant 2017 SGR 828 to the Agricultural Biotechnology and Bioeconomy Unit; and the European Union Framework Program DISCO (from discovery to final products: a next-generation pipeline for the sustainable generation of high-value plant products; Project 613513) to P.D.F.
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherNational Academy of Sciences
dc.relationMINECO/PN2017-2020/RTI2018-097613-BI00
dc.relationMINECO/PN2017-2020/PGC2018-097655-B-I00
dc.relationMINECO/PN2017-2020/AGL2017-85377-R
dc.relation.isformatofVersió postprint del document publicat a: https://doi.org/10.1073/pnas.2014860117
dc.relation.ispartofProceedings of the National Academy of Sciences of the United States of America, 2020, vol. 117, num. 42, p. 26503-26512
dc.rights(c) Baysal, Can et al., 2020
dc.subjectEndosperm
dc.subjectHigh-amylose rice
dc.subjectmetabolomics
dc.subjectStarch biosynthesis
dc.subjecttranscriptomics
dc.titleInactivation of rice starch branching enzyme IIb triggers broad and unexpected changes in metabolism by transcriptional reprogramming
dc.typeinfo:eu-repo/semantics/article
dc.date.updated2020-10-28T10:07:36Z
dc.identifier.idgrec030561
dc.type.versioninfo:eu-repo/semantics/acceptedVersion
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.identifier.doihttps://doi.org/10.1073/pnas.2014860117
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/FP7/613513


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