中文摘要：栽培的番茄经常暴露于极端高温环境中，并遭受番茄黄化曲叶病毒（TYLCV）的侵染。这种高温与病毒入侵的胁迫组合可导致严重的病害和减产。本研究比较了易感及抗TYLCV的番茄对高温胁迫和病毒入侵的反应。研究发现，感染了TYLCV的植物热胁迫反应遭到破坏，认为热胁迫反应的减弱是因为热休克转录因子HSFA2转运至受侵染细胞核的能力变弱。
外文摘要：Cultured tomatoes are often exposed to a combination of extreme heat and infection with Tomato yellow leaf curl virus (TYLCV). This stress combination leads to intense disease symptoms and yield losses. The response of TYLCV-susceptible and resistant tomatoes to heat stress together with viral infection was compared. The plant heat-stress response was undermined in TYLCV infected plants. The decline correlated with the down-regulation of heat shock transcription factors (HSFs) HSFA2 and HSFB1, and consequently, of HSF-regulated genes Hsp17, Apx1, Apx2 and Hsp90. We proposed that the weakened heat stress response was due to the decreased capacity of HSFA2 to translocate into the nuclei of infected cells. All the six TYLCV proteins were able to interact with tomato HSFA2 in vitro, moreover, coat protein developed complexes with HSFA2 in nuclei. Capturing of HSFA2 by viral proteins could suppress the transcriptional activation of heat stress response genes. Application of both heat and TYLCV stresses was accompanied by the development of intracellular large protein aggregates containing TYLCV proteins and DNA. The maintenance of cellular chaperones in the aggregated state, even after recovery from heat stress, prevents the circulation of free soluble chaperones, causing an additional decrease in stress response efficiency.
作者：Ghandi, Anfoka；Adi, Moshe；Lilia, Fridman；等
作者单位：以色列希伯莱大学
期刊名称：SCIENTIFIC REPORTS
期刊影响因子：5.228
出版年份：2016
出版刊次：1
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