Exploring changes in texture, colour, pungency and storability in diverse chilli genotypes for discriminating behaviour beyond harvest

Abstract

In this study, postharvest behavioural dynamics among 52 diverse chilli genotypes was observed during storage (15°C) to discriminate and cluster them in accordance to their inherent responses. Fruit weight, size, weight loss, colour change, firmness, capsaicin, chlorophyll, carotenoids (red and yellow fractions), moisture content and purchase preference were recorded. Significant differences were observed among genotypes. A2 x IIVRC 18057 and IIVRC 18093 registered minimum (24.4 %) and maximum (71.7 %) weight loss, respectively at the end of storage. In all genotypes, moisture content declined with storage. Genotype dependent inverse relationship between capsaicin content at green and red stage was observed (r= -0.51). Firmness ranged between highest (4.65 N) in IIVRC 22100 on day zero, to lowest (0.14 N) in A3 x F5–112 on day 10. IIVRC 18131, Kashi Surkh, and IIVRC 18160 showed higher firmness. The loss of smooth glossy appearance, colour change and carotenoids accumulation showed variable responses during storage. Minimum colour changes were observed in IC119455, IC114957, IC119326, IC119327, EC 578666, IIVRC 18093, IIVRC 23002 and IIVRC 20005. Chlorophyll ranged between 68.63 µg/g fw (Pusa Jwala) to 270.61 µg/g fw (Kashi Gaurav) initially. Chemometric analysis using clustering and principal component analysis was performed. IIVRC 18093 and IIVRC 18253 were found most distant and can be utilized in breeding. IIVRC 18057 clearly indicated consumer liking in preference ranking test over other genotypes on final day. Overall, inherent diversity pointed the potential for careful selection of specific genotypes for definite breeding, consumer acceptability, marketing and storability strategies.