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Symptoms of infected plants and selection of resistance to bacterial canker in Kiwifruit accessions (Actinidia deliciosa & Actinidia chinensis)

Mockhee Lee: Namhae branch, NIHHS, RDA

<div>Bacterial canker that causes serious damage to the Kiwifruit (<em>Actinidia deliciosa</em> & <em>Actinidia chinensis</em>) industry is caused by <em>Pseudomonas syringae</em> pv. <em>actinidiae </em>(<em>Psa</em>). This study was carried out to identify symptoms of bacterial canker and to select resistance resources. Bacteria, Psa2 (KBE9) and Psa3 (SYS2), were cultured. Before inoculation, the grafted kiwifruits, one or two-year-old, were disinfected by 80% ethanol and adapted at a temperature of 18 to 20 degrees Celsius and relative humidity of 80% or higher. After that, the plantlets were inoculated by spraying without no-wounds. Main symptoms were composed of angular necrotic dark leaf spot with a halo, angular necrotic dark leaf spot without a halo, yellowish chlorotic halos and necrosis like wilting. In <em>A. deliciosa</em>, Psa2 inoculation gave an average disease index 2.0 and Psa3 did 2.29. Jecy Green (A. hybrid), Chin Mei and M51-2 showed no or fewer symptoms. In <em>A. chienesis</em>, Psa2 and Psa3 showed 2.56 and 1.96 disease index respectively. Golden King and Songoku also showed no or fewer symptoms. We selected germplasms that has low disease index and the second test is underway.</div>