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News|Articles|April 14, 2026

Utilizing HPLC and Genomic Prediction to Standardize Pungency in Chili Pepper Breeding

Author(s)John Chasse
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Key Takeaways

  • High-parent heterosis was observed in nearly half of F1s, and it was enriched in crosses where both parents had comparatively low pungency.
  • HPLC-based quantification of capsaicin and dihydrocapsaicin enabled modeling of total capsaicinoids as a primary pungency determinant for breeding selection.
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Controlling the "heat" or pungency levels in chili peppers (Capsicum annuum) is a major challenge for breeders due to complex genetic inheritance. To address this, researchers are using high-performance liquid chromatography (HPLC) to precisely quantify capsaicin and dihydrocapsaicin levels. By combining these accurate chemical measurements with genomic prediction (GP) models, scientists can now better predict the spice levels of offspring based on parental data.

Pungency levels (capsaicinoid content) are critical traits influencing the quality and commercial value of chili peppers (Capsicum annuum). However, their complex inheritance patterns make controlling them challenging when crossing different progeny in current breeding programs. Seeking to overcome this challenge, researchers explored genomic prediction (GP) for crossing different progeny based solely on parental data. In their initial study, the researchers assessed the feasibility of GP in 156 F1 (the initial offspring of two genetically distinct parent) accessions derived from 20 parents within 132 inbred C. annuum accessions. Capsaicinoid content (capsaicin, dihydrocapsaicin, and their total) was quantified using high-performance liquid chromatography (HPLC). A paper based on their efforts was published in Breeding Science.1

Cultivated worldwide and an economically crucial crop supporting both large-scale production and smallholder farming systems, chili peppers have a variety of uses, not only as vegetables but also as spices, due to the pungency traits unique to the Capsicum genus.2,3 This pungency of the chili pepper is due to chemical compounds known as capsaicinoids that are mainly synthesized in the placental septum tissue of chili pepper fruits.4,5 How hot a chili pepper is depends on its capsaicin levels. This heat determines whether we treat a pepper as a regular vegetable or use it as a spice—which is why farmers focus so much on getting the spice level just right when growing new pepper varieties. Beyond just adding flavor, the compound that makes peppers spicy is getting a lot of attention for its health benefits. It is becoming a popular ingredient for reducing inflammation, acting as an antioxidant, boosting weight loss, and potentially even fighting tumors.6

Inheritance analysis conducted by the researchers revealed that nearly half of the F1 accessions exhibited high-parent heterosis (F1 > higher parent), particularly in crosses between lower-pungency parents. GP for F1 accessions was then perfusing 3149 single nucleotide polymorphisms from inbred accessions. Among 11 models tested, GBLUP-GAUSS tended to show high accuracy, with predicted values showing a significant positive correlation (r = 0.770, P < 0.01) with observed capsaicinoid content (μg·gDW-1), although the involvement of heterosis in reducing accuracy was observed.1

The authors of the paper state that their study “comprehensively clarified the inheritance characteristics of pungency-related traits in F1 progenies. Additionally, it provided insights into the utility and limitations of the GP approach for predicting these traits based on parental information. Our findings suggest that the application of GP for assessing pungency-related traits in high-heterozygosity populations may be feasible using data from highly homozygous populations. Thus, evaluating GP performance not only in F1 progeny but also in other segregating generations, such as F2 progeny (the offspring produced by crossing two F1 individuals), is considered valuable. Finally, the empirical data presented in this study will serve as fundamental information for establishing GP-based breeding strategies, including F1 hybrid breeding and pedigree breeding.”1

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References

  1. Ahmed, N.; Matsushima, K.; Kumanomido, Y. et al. Inheritance Characteristics and Potential of Genomic Prediction for Pungency Levels in F1 Progeny of Chili Pepper (Capsicum annuum). Breed Sci. 2025, 75 (4), 303-314. DOI: 10.1270/jsbbs.25011
  2. Kantar, M.B.; Anderson, J. E.; Lucht, S. A. et al. Vitamin Variation in Capsicum spp. Provides Opportunities to Improve Nutritional Value of Human Diets. PLoS One 2016, 11, e0161464. DOI: 10.1371/journal.pone.0161464
  3. Duranova, H.; Valkova, V.; Gabriny, L. Chili Peppers (Capsicum spp.): The Spice Not Only for Cuisine Purposes: An Update on Current Knowledge. Phytochem Rev. 2022, 21, 1379–1413. DOI: 10.1007/s11101-021-09789-7
  4. Suzuki, T.; Iwai, K. Constituents of Red Pepper Species: Chemistry, Biochemistry, Pharmacology, and Food Science of the Pungent Principle of Capsicum Species; in The Alkaloids: Chemistry and Pharmacology 1984, 23, 227–299.
  5. Fujiwake, H.; Suzuki, T.; Iwai, K. Capsaicinoid Formation in the Protoplast from the Placenta of Capsicum Fruits. Agric Biol Chem 1982, 46, 2591–2592. DOI: 10.1080/00021369.1982.10865477
  6. Naves, E.R.; de Ávila Silva, L.; Sulpice, R. et al. Capsaicinoids: Pungency Beyond Capsicum. Trends Plant Sci. 2019, 24, 109–120. DOI: 10.1016/j.tplants.2018.11.001

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