Corporate Banner
Satellite Banner
AgriGenomics
Scientific Community
 
Become a Member | Sign in
Home>News>This Article
  News
Return

Why do hybrid crop varieties perform so much better than parental lines?

Published: Wednesday, September 12, 2012
Last Updated: Wednesday, September 12, 2012
Bookmark and Share
Chinese investigate the heterosis in rice

Genetic composition of yield heterosis in an elite rice hybrid

Gang Zhou, Ying Chen, Wen Yao, Chengjun Zhang, Weibo Xie, Jinping Hua1, Yongzhong Xing, Jinghua Xiao, and Qifa Zhang2

+ Author Affiliations


National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan 430070, China

Contributed by Qifa Zhang, August 15, 2012 (sent for review June 23, 2012)

 Heterosis refers to the superior performance of hybrids relative to the parents. Utilization of heterosis has contributed tremendously to the increased productivity in many crops for decades. Although there have been a range of studies on various aspects of heterosis, the key to understanding the biological mechanisms of heterotic performance in crop hybrids is the genetic basis, much of which is still uncharacterized. In this study, we dissected the genetic composition of yield and yield component traits using data of replicated field trials of an “immortalized F2” population derived from an elite rice hybrid. On the basis of an ultrahigh-density SNP bin map constructed with population sequencing, we calculated single-locus and epistatic genetic effects in the whole genome and identified components pertaining to heterosis of the hybrid. The results showed that the relative contributions of the genetic components varied with traits. Overdominance/pseudo-overdominance is the most important contributor to heterosis of yield, number of grains per panicle, and grain weight. Dominance × dominance interaction is important for heterosis of tillers per plant and grain weight and has roles in yield and grain number. Single-locus dominance has relatively small contributions in all of the traits. The results suggest that cumulative effects of these components may adequately explain the genetic basis of heterosis in the hybrid.


Further Information
Access to this exclusive content is for Technology Networks Premium members only.

Join Technology Networks Premium for free access to:

  • Exclusive articles
  • Presentations from international conferences
  • Over 2,500+ scientific posters on ePosters
  • More than 3,700+ scientific videos on LabTube
  • 35 community eNewsletters


Sign In



Forgotten your details? Click Here
If you are not a member you can join here

*Please note: By logging into TechnologyNetworks.com you agree to accept the use of cookies. To find out more about the cookies we use and how to delete them, see our privacy policy.


Scientific News
Marijuana Genome Unraveled
A study by Canadian researchers is providing a clearer picture of the evolutionary history and genetic organization of cannabis, a step that could have agricultural, medical and legal implications for this valuable crop.
Grape Waste Could Make Competitive Biofuel
The solid waste left over from wine-making could make a competitive biofuel, University of Adelaide researchers have found.
Accelerating Forage Breeding to Boost Livestock Productivity
International expert skill-sets in genomics and bioinformatics enhance our capacity to breed improved forages for Africa.
Firefly Protein Enables Visualization of Roots in Soil
A new imaging tool from a team led by Carnegie’s José Dinneny allows researchers to study the dynamic growth of root systems in soil, and to uncover the molecular signaling pathways that control such growth.
So Long, Snout
Research helps answer how birds got their beaks.
The Tree of Life — More Like A Bush
New species evolve whenever a lineage splits off into several. Because of this, the kinship between species is often described in terms of a ‘tree of life’, where every branch constitutes a species.
Algae Nutrient Recycling is a Triple Win
Sandia method cheaper, greener and cuts competition for fertilizer.
Non-Transgenic Rapeseed Product Launched For Chinese Market
Cibus and Rotam have announced a new agreement to cooperate in the development of herbicide-tolerant rapeseed in China.
TGAC Leads Development to Diminish Threat to Vietnam’s Most Important Crop
Advanced bioinformatics capabilities for next-generation rice genomics in Vietnam to aid precision breeding.
BESC Creates Microbe That Bolsters Isobutanol Production
Another barrier to commercially viable biofuels from sources other than corn has fallen with the engineering of a microbe that improves isobutanol yields by a factor of 10.
Skyscraper Banner

Skyscraper Banner
Go to LabTube
Go to eposters
 
Access to the latest scientific news
Exclusive articles
Upload and share your posters on ePosters
Latest presentations and webinars
View a library of 1,800+ scientific and medical posters
2,500+ scientific and medical posters
A library of 2,500+ scientific videos on LabTube
3,700+ scientific videos
Close
Premium CrownJOIN TECHNOLOGY NETWORKS PREMIUM FREE!