The Plant Pathology Journal 2005;21(4):355-360.
Published online December 31, 2005.
Altered Sulfate Metabolism of Arabidopsis Caused by Beet Severe Curly Top Virus Infection
Hong Gun Lee, Sung Hee Park, Dong Giun Kim, Taek Kyun Lee, Seung Shic Yum, Chung Kyoon Auh, Suk Chan Lee
Sulfur, an important component of plants, is regulated by a variety of stresses in sulfate assimilation and metabolism. Increase has been observed in the expression of O-acetylserine(thiol)lyase (OASTL) through two-dimensional electrophoresis with the shoot tips of Arabidopsis infected by beet severe curly top geminivirus (BSCTV). With the three- to six-fold increases in the transcript expression of OASTL, serine acetyltransferase (SAT) and γ-glutmylcysteine synthetase (GSH) were induced over the mock-inoculated organization in each organization through real-time RT-PCR analysis.The expression of those genes might affect the accumulation of anthocyanin in symptomatic tissues and the induction of abnormal callus-like structures formed by additional cell divisions as typical disease symptoms of BSCTV-infected Arabidopsis. This is the first report to describe the collaborative induction of OASTL, SAT,and GSH in virus-infected plants. The changed expressions of OASTL, SAT, and GSH in Arabidopsis infected with BSCTV raises new aspects regarding the biological function of symptomatic tissues related to sulfate metabolism.
Key Words: O-acetylserine(thiol)lyase, Arabidopsis, BSCTV, γ-glutmylcysteine synthetase, serine acetyltransferase
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