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The unique trait 'pungency' in peppers (Capsicum.) results from the secondary metabolites known as capsaicinoids. Previous studies have identified a single dominant gene, Pun1, to be involved in biosynthesis of capsaicin. Molecular markers to distinguish between presence and absence of pungency have already been developed. But there have been little studies and information concerning the genetic control of quantitative trait of capsaicinoid content in Capsicum fruit. The purpose of this study aimed cultivation and evaluation of F7 RIL population for QTL analysis related to the capsaicinoid content. We have evaluated several horticultural characteristics including the capsaicinoid content in two parents and 93 plants of F7 generation. The capsaicinoid content of pungent parent, Saengryeg 211 was found to be 341.6 mg/100 g, which was higher than pungent cultivar, 'Chungyang'. For the non-pungent parent, Saengryeg 213, it was 0mg/100 g. This coincidence with molecular marker related to presence/absence of pungency. The capsaicinoid content in 93 plants of F7 generation ranges from 77.8 mg/100 g to 1046.0 mg/100 g and its distribution in pungent lines showed a normal curve pattern. These results provide a strong foundation of this mapping population for further QTL analysis studies related to fruit quality including the pungency level [ABSTRACT FROM AUTHOR]

Thirteen horticultural characteristics included fruit color, fruit shape, fruit-tip orientation and others were evaluated using an intra-specific population of 129 F6 recombinant inbred lines (RILs), which derived from a cross between 'Mandarin' (Capsicum annuum L.), large sized yellow bell pepper, and 'Blackcluster' (Capsicum annuum L.), small sized, deep purple fruit colored and highly pungency. There were 12 patterns of fruit color changed during fruit maturity. The most distribution of the pattern was from green to red observed in 51 RILs, the following pattern was green to purple and ivory to orange in 45 and 8 RILs, respectively. Red mature fruit color was observed in 99 RILs, orange color in 17 RILs, and yellow color in 13 RILs. The fruit shape was divided into three major groups. Triangular fruit distributed highest number of RILs (64 lines), the following was oval shape (52 lines) and cardioid shape (13 lines). Fruit-tip orientation was also examined and resulted that erect type was observed in 79 lines, and pendant type was in 50 lines. The presence of variability of characteristics in study population can be utilized for research of various fruit quality-related traits in the future. [ABSTRACT FROM AUTHOR]