Broad spectrum resistance to ssDNA viruses associated with transgene-induced gene silencing in cassava

被引：97

作者：

Chellappan, P ^{[1
]}

Masona, MV ^{[1
]}

Vanitharani, R ^{[1
]}

Taylor, NJ ^{[1
]}

Fauquet, CM ^{[1
]}

机构：

[1] Danforth Plant Sci Ctr, St Louis, MO 63132 USA

来源：

PLANT MOLECULAR BIOLOGY | 2004年 / 56卷 / 04期

关键词：

cassava; cassava mosaic disease; geminivirus; post-transcriptional gene silencing; siRNA; virus resistance;

D O I：

10.1007/s11103-004-0147-9

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Geminiviruses are ssDNA viruses that infect a range of economically important crop species. We have developed a pathogen-derived transgenic approach to generate high levels of resistance against these pathogens in a susceptible cultivar of cassava (Manihot esculenta). Integration of the ACl gene (which encodes the replication-associated protein) from African cassava mosaic virus imparted resistance against the homologous virus and provided strong cross-protection against two heterologous species of cassava-infecting geminiviruses. Short-interfering RNAs specific to the ACl transgene were identified in the two most resistant transgenic plant lines prior to virus challenge. Levels of ACl mRNA were suppressed in these plants. When challenged with geminiviruses, accumulation of viral DNA was reduced by up to 98% compared to controls.. providing evidence that integration of ACl initiates protection against viral Infection via a post-transcriptional gene silencing mechanism. The robust cross-resistance reported has important implications for field deployment of transgenic strategies to control germiniviruses.

引用

页码：601 / 611

页数：11