Genetic dissection of agronomic traits in Capsicum baccatum var. pendulum

Abstract

ABSTRACT. Genetic mapping is very useful for dissecting complex agronomic traits. Genetic mapping allows for identification of quantitative trait loci (QTL), provide knowledge on a gene position and its adjacent region, and enable prediction of evolutionary mechanisms, in addition to contributing to synteny studies. The aim of this study was to predict genetic values associated with different agronomic traits evaluated in an F 2 population of Capsicum baccatum var. pendulum. Previously, a reference genetic map for C. baccatum was constructed, which included 183 markers (42 microsatellite, 85 inter-simple sequence repeat, and 56 random amplification of polymorphic DNA) arranged in 16 linkage groups. The map was used to identify QTL associated with 11 agronomic traits, including plant height, crown diameter, number of days to flowering, days to fruiting, number of fruits per plant, average fruit weight, fruit length, fruit diameter, fruit QTLs for agronomic traits in C. baccatum var. pendulum pulp thickness, soluble solids, and fruit dry weight. QTL mapping was performed by standard interval mapping. The number of small QTL effects ranged from 3-11, with a total of 61 QTL detected in 9 linkage groups. This is the first report involving QTL analysis for C. baccatum species.

Towards a new strategy to breed an autogamous plant: A case of study in Capsicum baccatum var. pendulum

“…pendulum hybrids and advanced lines (Gonç alves et al, 2011;Rodrigues et al, 2012;Medeiros et al, 2014;Moulin et al, 2015), since we have been trying to improve this species for yield and diseases resistance such as Pepper yellow mosaic virus (Bento et al, 2013) and anthracnose, caused by Colletotrichum spp. .…”

Genotype x environment interaction on experimental hybrids of chili pepper

“…However, being aware of this reality, researchers have intensified efforts on studies with peppers of the species C. baccatum. Among them, there are studies on phenotypic diversity characterization (Rêgo et al, , 2015Leite et al, 2016), diallelic analysis and correlation between quantitative traits (Gonçalves et al, 2011;Rodrigues et al, 2012;Medeiros et al, 2014;Rêgo et al, 2009Rêgo et al, , 2015, inheritance of resistance to Pepper yellow mosaic virus -PepYMV (Bento et al, 2013), new cultivars resistant to PepYMV (Oliveira et al, 2015), reference map building (Moulin et al, 2015b), and dissection of QTLs for agronomic traits (Moulin et al, 2015a).…”

Molecular and agronomic analysis of intraspecific variability in Capsicum baccatum var. pendulum accessions

“…pendulum is mainly cultivated at medium altitudes on the plains of Argentina, Bolivia, Peru, Ecuador, Paraguay, Colombia, and Chile, and in different environments in Brazil (Albrecht et al, 2012), from rain forests to savannah areas. In Brazil, chili peppers belonging to this species are widely produced by family farmers, and the types cambuci and dedo-de-moça (finger's lady) are commonly grown for fresh consumption or for processing into powder or extracts (Rêgo et al, 2011;Rodrigues et al, 2012;Moulin et al, 2015). The conservation of local varieties of C. baccatum in germplasm banks is essential to preserve the diversity of this species and to provide researchers with a range of genetic resources that can be applied in breeding programs.…”