Evaluation of interspecific crossing line x tester (C. annuum and C. frutescens) on chili fruit based on image processing and multivariate analysis

Abstract

Developing interspecific crosses of chili peppers is one way to expand the range expected by the market. Common interspecific crosses were Capsicum annum and Capsicum frutescens . However, systematic and detailed evaluations of the effects of these crosses on fruit quality have rarely been conducted. Therefore, the objectives of this study were (1) to determine effective evaluation criteria for chili fruit from interspecific crosses of C. annuum and C. frutescens, and (2) to identify the effect of interspecific crosses on for offspring based on evaluation criteria. This study was conducted in two stages. The first stage was a reciprocal line x tester cross between C. frutescens (Sonar, Bara, Bhaskara) and C. annuum (Pilar and Igo). The second stage involved evaluation of the line × tester hybrids. The evaluation was conducted in a randomized complete block design with genotypes, 12 interspecies hybrids, and five elders as the main factors, repeated three times. Observations focused on five agronomic characters, and 14 image-processing characters were systematically analyzed using multivariate analysis. Based on the results of this study, the characteristics of HUE (H 2 = 68.18 %), fruit area (H 2 = 84.85 %), and fruit weight (H 2 = 50.00 %) can be used as criteria for assessing the crossing potential between the two species. These characters demonstrate that C. frutescens influences the fruit agronomic potential of the hybrid progeny compared to C. annuum, both as a line and tester. Even so, HUE can distinguish between the influence of the two species when acting as females and males. Therefore, the HUE is recommended as an adequate colorimetric criterion for assessing the interaction potential of the hybrid progeny of the two species.

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