S01 - Session O9 - II - Heterosis of six F1 hybrids chili varieties to anthracnose disease (Colletotrichum acutatum) at green fruit stages

Authors: Patcharaporn Suwor *, Patcharapan Sangarun, Kanjana Saetie, Wen Shi Tsai, Suchila Techawongstien, Tanyarat Tainta, Sanjeet Kumar, Nakarin Jeeartid, Orawan Chatchawankanphanich, Somsak Kramchote

Anthracnose is one of the most harmful fungal diseases affecting the fruit quality and yield of chili.This study aimed to assess anthracnose resistance of 6 hybrid chili pepper varieties compared to their parental lines. Two male resistant parents were crossed with three commercial female ones by North Carolina mating design II. All chili genotypes were grown in a greenhouse in a randomized complete block design with three replications of 10 plants each. Five mature green fruits per plant were harvested and inoculated with C. acutatum by using the micro-injection method. ANT4 is a resistant parent derived from PBC80, which was shown to be symptomless. However, ANT10, a resistant parent derived from PBC932, showed medium symptoms. The F 1 hybrids derived from ANT4 showed smaller symptoms than those from ANT10 with lesion sizes ranges of 7.47-9.82 mm and 9.40-11.04 mm, respectively. However, the percentage heterosis of anthracnose disease traits for Jindanil (JD) resulted in lower values than for the other susceptible parents (JD × ANT4 and JD × ANT10 were -3.24 and -26.91, respectively). Therefore, the JD variety is crucial for using an elite line for producing good F 1 hybrid tolerance to anthracnose disease.