Early Establishment of Photosynthesis and Auxin Biosynthesis Plays a Key Role in Early Biomass Heterosis in Brassica napus (Canola) Hybrids.

Zhu, A; Wang, A; Zhang, Y; Dennis, ES; Peacock, WJ; Greaves, AIK

Early Establishment of Photosynthesis and Auxin Biosynthesis Plays a Key Role in Early Biomass Heterosis in Brassica napus (Canola) Hybrids.

Zhu, A Wang, A Zhang, Y Dennis, ES Peacock, WJ Greaves, AIK

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Publisher:: Oxford University Press (OUP)
Publication Type:: Journal Article
Citation:: Plant & cell physiology, 2020, 61, (6), pp. 1134-1143
Issue Date:: 2020-06

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Field	Value	Language
dc.contributor.author	Zhu, A
dc.contributor.author	Wang, A
dc.contributor.author	Zhang, Y
dc.contributor.author	Dennis, ES
dc.contributor.author	Peacock, WJ
dc.contributor.author	Greaves, AIK
dc.date.accessioned	2020-07-01T03:46:14Z
dc.date.available	2020-03-16
dc.date.available	2020-07-01T03:46:14Z
dc.date.issued	2020-06
dc.identifier.citation	Plant & cell physiology, 2020, 61, (6), pp. 1134-1143
dc.identifier.issn	0032-0781
dc.identifier.issn	1471-9053
dc.identifier.uri	http://hdl.handle.net/10453/141704
dc.description.abstract	Heterosis or hybrid vigor has been used widely for more than a decade in Canola (Brassica napus) production. Canola hybrids show heterosis in a variety of traits compared to parents, including increased biomass at the early stages of seedling establishment, which is a critical developmental step that impacts future plant growth and seed yield. In this study, we examined transcriptomes of two parental lines, Garnet (Gar) and NX0052 (0052), and their reciprocal hybrids, Gar/0052, at 4 and 8 days after sowing (DAS). In hybrids, early seedling biomass heterosis is correlated with earlier expression of genes in photosynthesis pathways relative to parents. The hybrids also showed early expression of genes in the auxin biosynthesis pathway, consistent with the higher auxin concentrations detected in hybrid seedlings at 4 DAS. Auxin is a key phytohormone that regulates plant development promoting cell expansion and cell proliferation. Consistent with the increased levels of auxin, hybrids have larger and more palisade cells than the parents at the same time point. We propose a possible mechanism of early biomass heterosis through the early establishment of photosynthesis and auxin biosynthesis, providing insights into how transcriptional changes in hybrids are translated into phenotypical heterosis. This finding could be utilized in future Canola breeding to identify hybrid combinations with the superior early seedling establishment and strong levels of hybrid vigor in later plant development.
dc.format	Print
dc.language	eng
dc.publisher	Oxford University Press (OUP)
dc.relation.ispartof	Plant & cell physiology
dc.relation.isbasedon	10.1093/pcp/pcaa038
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.subject	0601 Biochemistry and Cell Biology, 0607 Plant Biology
dc.subject.classification	Plant Biology & Botany
dc.title	Early Establishment of Photosynthesis and Auxin Biosynthesis Plays a Key Role in Early Biomass Heterosis in Brassica napus (Canola) Hybrids.
dc.type	Journal Article
utslib.citation.volume	61
utslib.location.activity	Japan
utslib.for	0601 Biochemistry and Cell Biology
utslib.for	0607 Plant Biology
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	closed_access	*
dc.date.updated	2020-07-01T03:46:09Z
pubs.issue	6
pubs.publication-status	Published
pubs.volume	61
utslib.citation.issue	6

Abstract:

Heterosis or hybrid vigor has been used widely for more than a decade in Canola (Brassica napus) production. Canola hybrids show heterosis in a variety of traits compared to parents, including increased biomass at the early stages of seedling establishment, which is a critical developmental step that impacts future plant growth and seed yield. In this study, we examined transcriptomes of two parental lines, Garnet (Gar) and NX0052 (0052), and their reciprocal hybrids, Gar/0052, at 4 and 8 days after sowing (DAS). In hybrids, early seedling biomass heterosis is correlated with earlier expression of genes in photosynthesis pathways relative to parents. The hybrids also showed early expression of genes in the auxin biosynthesis pathway, consistent with the higher auxin concentrations detected in hybrid seedlings at 4 DAS. Auxin is a key phytohormone that regulates plant development promoting cell expansion and cell proliferation. Consistent with the increased levels of auxin, hybrids have larger and more palisade cells than the parents at the same time point. We propose a possible mechanism of early biomass heterosis through the early establishment of photosynthesis and auxin biosynthesis, providing insights into how transcriptional changes in hybrids are translated into phenotypical heterosis. This finding could be utilized in future Canola breeding to identify hybrid combinations with the superior early seedling establishment and strong levels of hybrid vigor in later plant development.

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http://hdl.handle.net/10453/141704