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2015 ; 11
(11
): 1296-305
Nephropedia Template TP
gab.com Text
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Transgenic Cotton Plants Expressing Double-stranded RNAs Target HMG-CoA Reductase
(HMGR) Gene Inhibits the Growth, Development and Survival of Cotton Bollworms
#MMPMID26435695
Tian G
; Cheng L
; Qi X
; Ge Z
; Niu C
; Zhang X
; Jin S
Int J Biol Sci
2015[]; 11
(11
): 1296-305
PMID26435695
show ga
RNA interference (RNAi) has been developed as a powerful technique in the
research of functional genomics as well as plant pest control. In this report,
double-stranded RNAs (dsRNA) targeting 3-hydroxy-3-methylglutaryl coenzyme A
reductase (HMGR) gene, which catalyze a rate-limiting enzymatic reaction in the
mevalonate pathway of juvenile hormone (JH) synthesis in cotton bollworm, was
expressed in cotton plants via Agrobacterium tumefaciens-mediated transformation.
PCR and Sothern analysis revealed the integration of HMGR gene into cotton
genome. RT-PCR and qRT-PCR confirmed the high transcription level of dsHMGR in
transgenic cotton lines. The HMGR expression both in transcription and
translation level was significantly downregulated in cotton bollworms
(helicoverpa armigera) larvae after feeding on the leaves of HMGR transgenic
plants. The transcription level of HMGR gene in larvae reared on transgenic
cotton leaves was as much as 80.68% lower than that of wild type. In addition,
the relative expression level of vitellogenin (Vg, crucial source of nourishment
for offspring embryo development) gene was also reduced by 76.86% when the insect
larvae were fed with transgenic leaves. The result of insect bioassays showed
that the transgenic plant harboring dsHMGR not only inhibited net weight gain but
also delayed the growth of cotton bollworm larvae. Taken together, transgenic
cotton plant expressing dsRNAs successfully downregulated HMGR gene and impaired
the development and survival of target insect, which provided more option for
plant pest control.