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Does low yield heterosis limit commercial hybrids in wheat?

Author: Sharma, R.K.
Year: 2013
ISSN: 1991-637X
URI: http://hdl.handle.net/10883/3471
Abstract: Heterosis has contributed to productivity gains in several crops like maize, rice, sorghum, cotton etc. Wheat breeders have largely been unsuccessful to take advantage from this technology at commercial level. Lack of commercial level yield heterosis is regarded as a major reason for this failure as compared to other technical barriers like difficult pollination control and seed production. The allopolyploidy nature of wheat endows even wheat purelines with a fixed intergenomic heterosis which perhaps is the foremost reason for lack of classical yield heterosis in wheat. The coming together of three diverse but functionally similar genomes causes differential gene expression among several other outcomes and leads to a diploid behaving self-sustaining intergenomic hybrid. A long history of highly successful pureline breeding and shortage of nicking parents are other two reasons responsible for failure to realize commercial level heterosis in wheat. Molecular biology tools now make it possible to dissect the phenomenon of heterosis into detectable Mendelian factors to tailor nicking parents to develop commercially sustainable wheat hybrids. This review probes the reasons for the absence of commercial-scale heterosis in wheat.
Language: English
Copyright: CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact CIMMYT-Knowledge-Center@cgiar.org indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose.
Type: Article
Pages: 6663-6669
Journal issue: 50
Journal: African Journal of Agricultural Research
Journal volume: 8
DOI: 10.5897/AJAR2013.8108
Keywords: Wheat
Keywords: Triticum
Keywords: hybrid
Keywords: Heterosis
Keywords: Yield
Publisher URI: http://www.academicjournals.org/article/article1387380140_Sharma.pdf


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  • Wheat
    Wheat - breeding, phytopathology, physiology, quality, biotech

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