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Posttranscriptional gene silencing in transgenic sugarcane: dissection of homology-dependent virus resistance in a monocot that has a complex polyploid genome

(1999) PLANT PHYSIOLOGY. 119(4). p.1187-1198
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Abstract
RNA-mediated, posttranscriptional gene silencing has been determined as the molecular mechanism underlying transgenic virus resistance in many plant virus-dicot host plant systems. In this paper we show that transgenic virus resistance in sugarcane (Saccharum spp. hybrid) is based on posttranscriptional gene silencing. The resistance is derived from an untranslatable form of the sorghum mosaic potyvirus strain SCH coat protein (CP) gene. Transgenic sugarcane plants challenged with sorghum mosaic potyvirus strain SCH had phenotypes that ranged from fully susceptible to completely resistant, and a recovery phenotype was also observed. Clones derived from the same transformation event or obtained after vegetative propagation could display different levels of virus resistance, suggesting the involvement of a quantitative component in the resistance response. Most resistant plants displayed low or undetectable steady-state CP transgene mRNA levels, although nuclear transcription rates were high. Increased DNA methylation was observed in the transcribed region of the CP transgenes in most of these plants. Collectively, these characteristics indicate that an RNA-mediated, homology-dependent mechanism is at the base of the virus resistance. This work extends posttranscriptional gene silencing and homology-dependent virus resistance, so far observed only in dicots, to an agronomically important, polyploid monocot.
Keywords
HIGH-LEVEL EXPRESSION, PATHOGEN-DERIVED RESISTANCE, MOSAIC-VIRUS, PLANTS, RNA, SEQUENCE, SUPPRESSION, INFECTION, SENSE, BOMBARDMENT

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Chicago
Ingelbrecht, Ivan, James E Irvine, and T Erik Mirkov. 1999. “Posttranscriptional Gene Silencing in Transgenic Sugarcane: Dissection of Homology-dependent Virus Resistance in a Monocot That Has a Complex Polyploid Genome.” Plant Physiology 119 (4): 1187–1198.
APA
Ingelbrecht, I., Irvine, J. E., & Mirkov, T. E. (1999). Posttranscriptional gene silencing in transgenic sugarcane: dissection of homology-dependent virus resistance in a monocot that has a complex polyploid genome. PLANT PHYSIOLOGY, 119(4), 1187–1198.
Vancouver
1.
Ingelbrecht I, Irvine JE, Mirkov TE. Posttranscriptional gene silencing in transgenic sugarcane: dissection of homology-dependent virus resistance in a monocot that has a complex polyploid genome. PLANT PHYSIOLOGY. 1999;119(4):1187–98.
MLA
Ingelbrecht, Ivan, James E Irvine, and T Erik Mirkov. “Posttranscriptional Gene Silencing in Transgenic Sugarcane: Dissection of Homology-dependent Virus Resistance in a Monocot That Has a Complex Polyploid Genome.” PLANT PHYSIOLOGY 119.4 (1999): 1187–1198. Print.
@article{2014535,
  abstract     = {RNA-mediated, posttranscriptional gene silencing has been determined as the molecular mechanism underlying transgenic virus resistance in many plant virus-dicot host plant systems. In this paper we show that transgenic virus resistance in sugarcane (Saccharum spp. hybrid) is based on posttranscriptional gene silencing. The resistance is derived from an untranslatable form of the sorghum mosaic potyvirus strain SCH coat protein (CP) gene. Transgenic sugarcane plants challenged with sorghum mosaic potyvirus strain SCH had phenotypes that ranged from fully susceptible to completely resistant, and a recovery phenotype was also observed. Clones derived from the same transformation event or obtained after vegetative propagation could display different levels of virus resistance, suggesting the involvement of a quantitative component in the resistance response. Most resistant plants displayed low or undetectable steady-state CP transgene mRNA levels, although nuclear transcription rates were high. Increased DNA methylation was observed in the transcribed region of the CP transgenes in most of these plants. Collectively, these characteristics indicate that an RNA-mediated, homology-dependent mechanism is at the base of the virus resistance. This work extends posttranscriptional gene silencing and homology-dependent virus resistance, so far observed only in dicots, to an agronomically important, polyploid monocot.},
  author       = {Ingelbrecht, Ivan and Irvine, James E and Mirkov, T Erik},
  issn         = {0032-0889},
  journal      = {PLANT PHYSIOLOGY},
  keyword      = {HIGH-LEVEL EXPRESSION,PATHOGEN-DERIVED RESISTANCE,MOSAIC-VIRUS,PLANTS,RNA,SEQUENCE,SUPPRESSION,INFECTION,SENSE,BOMBARDMENT},
  language     = {eng},
  number       = {4},
  pages        = {1187--1198},
  title        = {Posttranscriptional gene silencing in transgenic sugarcane: dissection of homology-dependent virus resistance in a monocot that has a complex polyploid genome},
  url          = {http://dx.doi.org/10.1104/pp.119.4.1187},
  volume       = {119},
  year         = {1999},
}

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