Hybrid Vigour and Hybrid Mimics in Japonica Rice

Zhang, Y; Ovenden, B; He, Y; Ye, W; Wu, X; Peacock, WJ; Dennis, ES

Hybrid Vigour and Hybrid Mimics in Japonica Rice

Zhang, Y Ovenden, B He, Y Ye, W Wu, X Peacock, WJ Dennis, ES

Permalink

Publisher:: MDPI
Publication Type:: Journal Article
Citation:: Agronomy, 2022, 12, (7)
Issue Date:: 2022-07-01

Open Access

Copyright Clearance Process

Recently Added
In Progress
Open Access

This item is open access.

Adobe PDF

Download full textAdobe PDF (2.42 MB)

View on publisher's site

View statistics

Full metadata record

Field	Value	Language
dc.contributor.author	Zhang, Y
dc.contributor.author	Ovenden, B
dc.contributor.author	He, Y
dc.contributor.author	Ye, W
dc.contributor.author	Wu, X
dc.contributor.author	Peacock, WJ
dc.contributor.author	Dennis, ES
dc.date.accessioned	2023-02-01T02:14:59Z
dc.date.available	2023-02-01T02:14:59Z
dc.date.issued	2022-07-01
dc.identifier.citation	Agronomy, 2022, 12, (7)
dc.identifier.issn	2073-4395
dc.identifier.issn	2073-4395
dc.identifier.uri	http://hdl.handle.net/10453/165730
dc.description.abstract	In crop improvement programs, hybrid vigour (heterosis) is an important breeding strategy but the molecular mechanisms of hybrid vigour are still unclear. Grain yield declines after F1 generation due to phenotypic segregation. We found that, at the early seedling stage in hybrids derived from the temperate japonica rice varieties ‘Doongara’ and ‘Reiziq’, hybrid vigour was approximately 40% greater than in the better parents. Inbred high-yielding lines (Hybrid Mimics) were developed from the ‘Doongara’ × ‘Reiziq’ F1 by selfing and recurrent selection for F1-like plants in the F2 through to the F5 generation. Grain yields are stable over subsequent generations in the Hybrid Mimic lines. The importance of photosynthesis in early seedling development was demonstrated. Photosynthesis-related genes were expressed in the hybrid earlier than in the parents; physiological evidence using gas exchange indicated the early commencement of photosynthesis. Dark germination experiments supported the requirement for photosynthesis for early vigour in hybrids.
dc.language	English
dc.publisher	MDPI
dc.relation.ispartof	Agronomy
dc.relation.isbasedon	10.3390/agronomy12071559
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0502 Environmental Science and Management, 0703 Crop and Pasture Production
dc.title	Hybrid Vigour and Hybrid Mimics in Japonica Rice
dc.type	Journal Article
utslib.citation.volume	12
utslib.for	0502 Environmental Science and Management
utslib.for	0703 Crop and Pasture Production
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
utslib.copyright.status	open_access	*
dc.date.updated	2023-02-01T02:14:58Z
pubs.issue	7
pubs.publication-status	Published
pubs.volume	12
utslib.citation.issue	7

Abstract:

In crop improvement programs, hybrid vigour (heterosis) is an important breeding strategy but the molecular mechanisms of hybrid vigour are still unclear. Grain yield declines after F1 generation due to phenotypic segregation. We found that, at the early seedling stage in hybrids derived from the temperate japonica rice varieties ‘Doongara’ and ‘Reiziq’, hybrid vigour was approximately 40% greater than in the better parents. Inbred high-yielding lines (Hybrid Mimics) were developed from the ‘Doongara’ × ‘Reiziq’ F1 by selfing and recurrent selection for F1-like plants in the F2 through to the F5 generation. Grain yields are stable over subsequent generations in the Hybrid Mimic lines. The importance of photosynthesis in early seedling development was demonstrated. Photosynthesis-related genes were expressed in the hybrid earlier than in the parents; physiological evidence using gas exchange indicated the early commencement of photosynthesis. Dark germination experiments supported the requirement for photosynthesis for early vigour in hybrids.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/165730