Genetic mapping and analysis of traits related to improvement of popcorn

Abstract

Table 4. QTL detected for number of days to pollen shed in F 2 plants and their F 2:3 families derived from a cross of a dent maize inbred line B104 with a popcorn inbred BP3.

QTL consistency for agronomic traits across three generations and potential applications in popcorn

“…In our previous studies, 158 and 28 QTLs associated with nine plant traits have been detected in F 2:3 and BC 2 F 2 generations respectively, which were developed from the same cross in this study (Li et al 2007a;2008). The F 2:3 and BC 2 F 2 populations were evaluated under the same conditions, but different from this RIL population.…”

“…But most of the positive alleles for grain yield components and agronomic traits main came from the dent corn parent Dan232. This showed that the utility of normal dent/flint maize to improve popcorn productivity was limited by the negative effects of the exotic germplasm on popping characteristics (Dhliwayo 2008;Ziegler 2001). Therefore, it is worth concentrating further research on the favorable QTLs with the higher contribution to agronomic traits by developing near-isogenic lines (NILs) of consistent QTL and their chromosome segment substitution lines (CSSL).…”

“…The traditional popcorn breeding practices have documented that the disadvantageous agronomic traits for popcorn production could be improved using normal dent or flint corn germplasm (Crumbaker et al 1949;Robbins and Ashman 1984;Ziegler and Ashman 1994). However, the negative effects of the exotic germplasm on popping characteristics limited popcorn germplasm improvement (Dhliwayo 2008;Ziegler 2001).…”

Quantitative trait loci mapping and meta-analysis across three generations for popping characteristics in popcorn

“…Mapping QTL for popping characteristics would be of benefit to conduct marker assisted selection (MAS) to overcome the shortcomings of the destructive popping test according to phenotype. Using 3 kinds of temporary genetic segregation populations derived from crosses between popcorn and dent or flint corn inbred lines, QTL for several popping characteristics have been identified on different chromosome regions of the genome, including BC 1 (Lu et al, 2003), BC 2 F 2 ) and F 2:3 (Babu et al, 2006;Dhliwayo, 2008;Li et al, 2006Li et al, , 2007. However, QTL detected for the same trait were highly inconsistent among those researches.…”

Production and Selection of Quality Protein Popcorn Hybrids Using a Novel Ranking System and Combining Ability Estimates

“…Due to primary selection of popping traits such as expansion volume and popability, popcorn is less optimized than other maize types in multiple agronomic traits such as pest susceptibility, stalk strength, and grain yield, and it has a relatively narrow breeding pool to integrate and improve agronomic traits (Robbins and Ashman, 1984;Sprague and Dudley, 1988;Dofing et al, 1991;Ziegler and Ashman, 1994). Previously, breeders' attempts at introducing dent corn germplasm into popcorn to improve its agronomic fitness have met with little success because of a negative correlation between expansion volume, a key popcorn quality trait, and grain yield (Brunson, 1937;Dofing et al, 1991;Ziegler and Ashman, 1994;Pereira and Amaral Júnior, 2001;Daros et al, 2002;Li et al, 2002Li et al, , 2007Li et al, , 2008Li et al, , 2009Dhliwayo, 2008). However, in 2018, Ren et al (2018) described an interpopulation breeding system between popcorn lines and dent "Quality Protein Maize" (QPM) varieties capable of increasing essential amino acid lysine in the seed proteome to more suitable levels for human dietary needs, and restored popping at early stages in the breeding program.…”