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http://dx.doi.org/10.7732/kjpr.2014.27.4.371

Response of Turnip to Botrytis cinerea Infection and Their Relationship with Glucosinolate Profiles  

Kwon, Soon-Tae (Department of Horticulture and Breeding, Andong National University)
Kliebenstein, Daniel J. (Department of Plant Science, University of California)
Publication Information
Korean Journal of Plant Resources / v.27, no.4, 2014 , pp. 371-379 More about this Journal
Abstract
In order to determine the response of turnip leaves to various races of Botrytis cinerea, fourteen different races were infected to the leaf surface and measured the lesion size. Based on lesion size of the pathogen on the leaves, turnip showed susceptible response to four races, moderate to seven races and resistant to three races. Four glucosinolate (GLS) compounds, such as butenyl GLS, indole-3ylmethyl GLS (I3M), 4-methoxy-indole-3-ylmethyl GLS (4MOI3M) and normal methoxy-indole-3ylmethyl GLS (NMOI3M) were identified in turnip leaves infected with Botrytis cinerea. Leaves infected with resistant races showed higher GLS contents as compared with the leaves infected with susceptible races. Contents of I3M in the leaves with resistant races were 2.5 times as high as those in uninfected leaves, whereas I3M in the leaves with susceptible races showed lower contents than those in untreated leaves. Leaves infected with resistant races showed 4MOI3M and NMOI3M contents 2.3 and 2.7 times as high as those in uninfected leaves, respectively. GLSs in the infected leaves were most abundant at 5~10 mm area from center of the lesion. However, the GLSs in 5~10 mm area were rapidly degradated at leaves with susceptible races which resulted in continuous expansion of the lesion on the leaves, whereas no degradation was obseveved at leaves with resistant races. These results suggest that accumulation and degradation of GLS compounds in turnip leaves closely related to the susceptibility and resistance of turnip leaves to Botrytis races.
Keywords
Turnip; Botrytis cinerea; Glucosinolate; Phytoalexin; Defense;
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