The genetic relationship between popping expansion volume and two yield components in popcorn using unconditional and conditional QTL analysis |
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| Authors: | Y L Li Y B Dong D Q Cui Y Z Wang Y Y Liu M G Wei X H Li |
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| Institution: | (1) College of Agriculture, Henan Agricultural University, 95 Wenhua Rd, Zhengzhou, China |
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| Abstract: | Popping expansion volume (PEV) is the most important quality trait in popcorn, while its germplasm is inferior to normal dent/flint
corn in yield. In this study, 259 F2:3 families, developed from the cross between a dent corn inbred Dan232 and a popcorn inbred N04, were evaluated for their PEV,
grain weight per plant (GWP) and 100-grain weight (100 GW) in two environments. The genetic relationship between PEV and GWP,
and 100 GW on individual gene loci were evaluated using unconditional and conditional QTL mapping methods. In total, five,
one and three unconditional QTL were identified for PEV, GWP, and 100 GW, respectively. The positive alleles of all QTL for
PEV were from N04, while positive alleles of all QTL for GWP and 100 GW were from Dan232. In conditional mapping, one and
two QTL failed to be detected, and all four additional QTL were detected. Nevertheless, three QTL were identified, which controlled
PEV independently from GWP/100 GW. They seemed to be potential candidates in popcorn breeding to increase PEV without decreasing
GWP/100 GW. The results suggested that for significantly correlated traits, the conditional QTL mapping method could be used
to dissect the genetic interrelationship between traits at the level of individual QTL, as well as reveal additional QTL that
were undetectable by unconditional mapping. |
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| Keywords: | Dent corn Popcorn Genetic relationship Popping expansion volume Grain yield components Unconditional and conditional QTL mapping analysis |
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