Integration of a hairpin RNA-encoding gene derived from Tobacco streak virus confers resistance in groundnut (Arachis hypogaea L.) against peanut stem necrosis disease

Madam Gurivi Reddy, Chinnaiah Senthilraja, Rangasamy Adhithya, Vijayalakshmi Kothandaraman Satya, Easwaran Kokiladevi, Durailagaraja Sudhakar, Ramalingam Rabindran, Rethinasamy Velazhahan

Research output: Contribution to journalArticle

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Abstract

The feasibility of controlling peanut stem necrosis disease caused by Tobacco streak virus (TSV) in groundnut (Arachis hypogaea L.) was explored by expressing double-stranded RNA of the replicase (Rep) gene of TSV in groundnut through genetic engineering. A hairpin (hp) RNAi construct containing 535-bp sense and antisense TSV-Rep sequences flanking a 742-bp spacer sequence (Pdk intron) under the control of the constitutive Cauliflower mosaic virus 35S promoter was made in the binary vector pART27. This chimeric gene construct was then mobilized into Agrobacterium tumefaciens strain LBA4404 via triparental mating using pRK2013 as a helper. Cotyledon explants of groundnut cultivar TMV-7 were transformed with A. tumefaciens harboring the hpRNA cassette. The presence of the transgene in the transgenic plants was confirmed up to T3 generation by PCR amplification of the 535-bp fragment of TSV-Rep gene. The bioassay results indicated that necrotic lesions were observed on the leaves of the wild-type plants 7-9 days after inoculation with TSV and stem necrosis appeared 16-20 days after inoculation, whereas the transgenic plants did not develop symptoms until harvest. ELISA results indicated that the wild-type plants inoculated with TSV recorded the highest virus concentration as compared to the transgenic lines.

Original languageEnglish
Pages (from-to)205-214
Number of pages10
JournalJournal of Plant Diseases and Protection
Volume123
Issue number5
DOIs
Publication statusPublished - Oct 1 2016

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Keywords

  • Agrobacterium tumefaciens
  • Arachis hypogaea
  • Genetic engineering
  • Replicase
  • Rnai
  • Tobacco streak virus

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science
  • Horticulture

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