The 5′ third of Cauliflower mosaic virus gene VI conditions resistance breakage in Arabidopsis ecotype tsu-0

被引:24
作者
Agama, K
Beach, S
Schoelz, J
Leisner, SM
机构
[1] Univ Toledo, Dept Sci Biol, Toledo, OH 43606 USA
[2] Univ Missouri, Coll Agr Food & Nat Resources, Plant Sci Unit, Columbia, MO 65211 USA
关键词
virus resistance;
D O I
10.1094/PHYTO.2002.92.2.190
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Arabidopsis thaliana ecotypes vary in their responses to viruses. In this study, we analyzed the variation in response of A. thaliana ecotype Tsu-0 to Cauliflower mosaic virus (CaMV). This ecotype was previously reported to be resistant to two CaMV isolates (CM1841 and CM4-184), but susceptible to W260. In this study, we show that Tsu-0 is resistant to four additional CaMV isolates. CaMV propagated within the rosette leaves of Tsu-0 plants, but did not appear to spread systemically into the in-florescence. However, virus viability in rosette leaves of Tsu-0 plants apparently was not compromised because infectious CaMV could be recovered from these organs. W260 overcomes Tsu-0 resistance by a passive mechanism (i.e., this virus avoids activating plant defenses). The portion of the viral genome responsible for W260 resistance breakage was mapped to the 5' third of gene VI, which we have termed RBR-1. This region is also responsible for controlling the ability of CaMV to infect different types of solanaceous plants. Hence, the pathways by which plants of different families interact with CaMV may be conserved through evolution.
引用
收藏
页码:190 / 196
页数:7
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