RNA-mediated gene silencing in the cereal fungal pathogen Cochliobolus sativus.

Abstract:

:A high-throughput RNA-mediated gene silencing system was developed for Cochliobolus sativus (anamorph: Bipolaris sorokiniana), the causal agent of spot blotch, common root rot and black point in barley and wheat. The green fluorescent protein gene (GFP) and the proteinaceous host-selective toxin gene (ToxA) were first introduced into C. sativus via the polyethylene glycol (PEG)-mediated transformation method. Transformants with a high level of expression of GFP or ToxA were generated. A silencing vector (pSGate1) based on the Gateway cloning system was developed and used to construct RNA interference (RNAi) vectors. Silencing of GFP and ToxA in the transformants was demonstrated by transformation with the RNAi construct expressing hairpin RNA (hpRNA) of the target gene. The polyketide synthase gene (CsPKS1), involved in melanin biosynthesis pathways in C. sativus, was also targeted by transformation with the RNAi vector (pSGate1-CsPKS1) encoding hpRNA of the CsPKS1 gene. The transformants with pSGate1-CsPKS1 exhibited an albino phenotype or reduced melanization, suggesting effective silencing of the endogenous CsPKS1 in C. sativus. Sectors exhibiting the wild-type phenotype of the fungus appeared in some of the CsPKS1-silenced transformants after subcultures as a result of inactivation or deletions of the RNAi transgene. The gene silencing system established provides a useful tool for functional genomics studies in C. sativus and other filamentous fungi.

journal_name

Mol Plant Pathol

authors

Leng Y,Wu C,Liu Z,Friesen TL,Rasmussen JB,Zhong S

doi

10.1111/j.1364-3703.2010.00666.x

subject

Has Abstract

pub_date

2011-04-01 00:00:00

pages

289-98

issue

3

eissn

1464-6722

issn

1364-3703

journal_volume

12

pub_type

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