Abstract
Colletotrichum acutatum spp. infects various economical crops worldwide and causes massive loss on their yields. Among those, Capsicum spp., which known as chili pepper, is on a critical issue by those pathogens. Due to the lack of their genetic markers in Korea, the unidentifiable various species of C. acutatum obstructs the mechanism studies of these pathogens and the selection of disease resistant breed lines. Therefore, we screened RGB images of the colonization progresses of pathogens to identify the species of Ca40042, K1, NN, AS2, and SW1 by time and temperature. Cultivated pathogens such as Ca40042, K1, and SW1 were detectable on quantified shape and color data of images from specific temperature conditions, while other pathogens were difficult to recognize. Although several limitations exist in identification results of current experiment, but also, we can expect this method can suggest the possibility to replace the genetic marker methods which is now unavailable in Korea.
Highlights
IntroductionSpecies of Colletotrichum acutatum J.H. Simmonds, cosmopolitan plant pathogen that causes pre- and postharvest anthracnose diseases
Chili pepper, which belongs to the genus Capsicum, family Solanaceae, and is one of the most important food additives used in spicy cuisines worldwide, has the major causes of fruit anthracnose in various countries including Korea, Taiwan, India, and Indonesia (Than et al, 2008; Tozze Jr et al, 2010)
The present study aims to find the identification criteria based on the characteristics of CA40042 strains, that are feasible to replace the genetic markers
Summary
Species of Colletotrichum acutatum J.H. Simmonds, cosmopolitan plant pathogen that causes pre- and postharvest anthracnose diseases. Chili pepper, which belongs to the genus Capsicum, family Solanaceae, and is one of the most important food additives used in spicy cuisines worldwide, has the major causes of fruit anthracnose in various countries including Korea, Taiwan, India, and Indonesia (Than et al, 2008; Tozze Jr et al, 2010). All C. acutatum species isolated from pepper remains unclear whether they are pathogenic or host-specific, and their degrees of toxicity. This results in the unprecise trait selection in breeding processes for the cultivation of resistant varieties which is the most effective method to overcome this disease. Due to the absence of genetic markers for identifying the various C. acuatum species that spread in Korea (Kang et al, 2005), yet, no resistant varieties were developed and provided
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