Research in Plant Disease 2008;14(3):159-164.
Published online December 30, 2008.
뿌리혹병 감염이 장미의 생육과 개화에 미치는 영향
한경숙, 김원희, 박종한, 한유경, 정승룡
Influence of Crown Gall Infection on Growth and Flowering of Rose
Kyung Sook Han, Won Hee Kim, Jong Han Park, You Kyoung Han, Seung Rong Cheong
Crown gall of rose (Rosa hybrida) was observed in greenhouse during 2003-2007. The average disease incidence was up to 38.1% and was more severe in hydroponic culture as compared to soil culture. The typical gall symptom occurred mainly on the root, crown, or both, and resulted on poor rooting, growth retardation and yield loss. The reduction rate of rooting influenced by crown gall was 57.5% as compared to healthy plants on nursery stock. The location of gall formation in the plant influenced growth vigor resulting in symptoms such as poor shooting. Healthy plants produced 19.1 flowers/m2, while diseased plants produced 9.5 flowers/m2 during the same cultivation period. Moreover, the number of days to flowering was longer for the diseased plants than for healthy plants - 51.2 days and 39.8 days for first harvest, and 60.6 days and 52.1 days for the second harvest, respectively. Conclusively, infection on the basal stem caused serious loss of the number of shoot formation; yield loss of cut flower was 38.7% due to crown gall infection and delay of harvesting time about 8-10 days.
Key Words: Agrobacterium tumefaciens, Crown gall, Rose

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