ผลของการใช้พันธุ์ทดสอบสำหรับการประเมินสายพันธุ์ข้าวโพดข้าวเหนียวในขั้นตอนการปรับปรุงพันธุ์ลูกผสม

Abstract

Choice of tester is important in the evaluation of lines for potential use in production hybrids. The objectives of this study were to determine the relative merits of two types of testers for evaluating waxy corn lines and 2) to evaluate waxy corn breeding lines in a hybrid development program. Eighteen S2 lines were crossed to two genetically narrow-base testers, inbred “101L” and hybrid “BW854” and to two genetically broad-base testers, “SLE” and “VNLE” in North Carolina mating design I. The parental lines and their 72 crosses were evaluated using Randomized Complete Block Design with 3 replications in the rainy season (May-August) 2010 at experimental Farm of Khon Kaen University. The results indicated that narrow genetic base tester can be effectively used to identify lines better than broad base tester. Two testers, “BW854” and “VNLE” were identified as the suitable testers for this breeding program. Five lines, “A5HJDL11”, “A5HJDL3”, “KND5”, “KNDs41” and “A5BW2” have high potential for further development of elite inbred lines.