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Acta Agron Sin ›› 2011, Vol. 37 ›› Issue (09): 1585-1591.doi: 10.3724/SP.J.1006.2011.01585

• CROP GENETICS & BREEDING · GERMPLASM RESOURCES · MOLECULAR GENETICS • Previous Articles     Next Articles

Inheritance Analysis of Lysine Content in Maize Kernel and Its Relationship with Grain Yield

TANG Ji-Hua,JI Hong-Qiang,LIU Yi-Bao,ZHANG Jun,TAN Xiao-Jun,HU Yan-Min,LIU Zong-Hua*   

  1. College of Agronomy, Henan Agricultural University, Zhengzhou 450002, China
  • Received:2011-01-24 Revised:2011-04-27 Online:2011-09-12 Published:2011-06-13
  • Contact: 刘宗华, E-mail: zhliu100@163.com

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Abstract: Fifteen inbred lines selected from five basic populations in maize (Zea mays L.) were crossed with five elite inbred lines derived from different heterotic groups according to NCII design, and the 75 combinations were evaluated at two environments in 2009. The lysine content in kernels of parents as well as their hybrids F1 and F2 populations was analyzed using the Near Infrared Reflectance Spectroscopy (NIRS) method. Statistical analysis of lysine contents was made based on the model of triploid seed endosperm, cytoplasm and maternal effect. The results showed that lysine content in kernels was controlled not only by three sets of genetic system, namely seeds, maternal effects and cytoplasm effects, but also affected by environmental factors. The genetic variance of VG (VG=VA+VD+VC+VAm+VDm) accounted for 76.3% of total genetic variance (VG+VGE), of the total genetic variance VG , variances of seed effect (VA+VD), cytoplasm effect (VC) and maternal effect (VAm+VDm) accounted for 24.6%, 19.7%, and 55.7%, respectively. The maternal heritability (h2m=40.98%) of lysine content was the highest, followed by seed heritability (h2o=17.86%), whilethe cytoplasm heritability (h2c=14.29%) was relatively lower. No significant correlation was found between the lysine contents in kernel and grain yield (r = –0.0269). Therefore,much attention should been paidto selecting high-value parental lines, especially female lines, in lysine content and to making diversified crosses among lines from different maize heterotic groups in high-lysine breeding. Based on the results from this study, it seems to be possible to improve lysine content and grain yield simultaneously from materials with extensive variances.

Key words: Maize, Lysine, Inheritance effect, Environment

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