優良單交種玉米之親本改良－I.理想供給親自交系之鑑別

Abstract

利用8個玉米自交系親本及其28個Fl全互交（不包括反交）單交種所進行之田間試驗資料，估算（μC＋μF）－（μD＋μE）及μG值，以鑑別理想供給親自交系。理想供給親自交系具有與產量有關之顯性基因，而此類基因並不存在於一有待改良之單交種中。當設計Hi25＋CM103、UH－1 × ICAL210及Pi77－4257 × Hi28為有待改良之單交種時，在不完全顯性之前提下，Pi77－4257及Oh545將獲選為CM103及ICAL210自交系改良之理想供給親。本試驗結果顯示：利用理想供給觀進行優良單交種之親本改良，或為玉米育種之另一有利途徑。 Data from field evaluation of eight parental maize inbred lines and 28 F1 diallel hybrids were used for estimation of (μC+μF)-(μD+μC) and μG for identifying inbred lines containing dominant allele affecting grain yield, which are not already present in an elite cross. When Hi25×CM103, UH-1×ICAL210 and Pi77-4257×Hi28 were designated as the elite hybrids to be improved, if incomplete dominance is assumed, Pi77-4257 and Oh545 would be chosen to improve CM103 and ICAL210, respectively. Results of this study suggest the method may be useful in practical breeding programs.