|Title:||台南白玉米自交系RAPD分析的遺傳歧異度與其F1雜種優勢之相關||Other Titles:||he Relationship between RAPD Heterozygosity and Heterosis of Inbred Lines Derived from Tainan-White Maize Populations||Authors:||謝光照
|Keywords:||玉米;傳歧異度;F1雜種;籽粒產量;雜種優勢;maize;genetic diversity;F1 hybrids;grain yield;heterosis||Issue Date:||Oct-2001||Publisher:||中華農學會||Journal Volume:||2||Journal Issue:||5||Start page/Pages:||402-413||Source:||中華農學會報||Abstract:||
The objective of this study was to evaluate the genetic diversity of 13 maize inbred lines, and to determine the relationship between genetic distance of the parental lines and their single cross hybrid heterosis. The randomly amplified polym01Phic DNA (RAPD) technique was used. SIX of these lines came from the Taichung populations, and the rest of inbred lines derived from other seven different population were available in this study. The agronomic traits of the 78 single crosses by half-diallel cross and their 13 parental lines were evaluated in the fall of 1996 at TARI. One Tainan white open- pollinated population was the check. Forty different 10-primers were used to give a total of 646 reproducible amplification products, 547 (84.7%) of them being polymolphic. Genetic diversity was determined using Jaccard's similarity coefficient. The results of this study showed that the inbred lines had significant difference in phenotypic traits and DNA sequences. The range of genetic distance between parental lines was from 0.421 to 0.772. There was no relationship existed between genetic distance and general combining ability (sum of the parental lines)of grain dry weight. But a significant relationship between the specific combining ability (SCA) and standard heterosis value (Hck) of grain dry weight of hybrid on genetic distance. However their coefficient of determination (R2) are low. So that the RAPD genetic diversity isn't effective to predicted the combining ability and standard heterosis value (Hck) of grain dry weight.
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