Video Experimental Relacionado
Updated: Jul 9, 2026
07:14
The Plant Infection Test: Spray and Wound-Mediated Inoculation with the Plant Pathogen Magnaporthe Grisea
Published on: August 4, 2018
La expresión del gen R inducida por un efector de tipo III desencadena la resistencia a las enfermedades en el arroz
Keyu Gu1, Bing Yang, Dongsheng Tian
1Temasek Life Sciences Laboratory, National University of Singapore, 1 Research Link, Singapore 117604, Singapore.
Nature
|June 24, 2005
Resumen
Los genes de resistencia a las enfermedades de las plantas (R) y los genes de avirulencia de patógenos (avr) dictan la especificidad. Este estudio revela que la expresión del gen Xa27 del arroz es inducida por el efector bacteriano AvrXa27, lo que confiere resistencia.
Área de la Ciencia:
- Patología vegetal patología vegetal.
- Genética molecular genética molecular.
- Interacciones entre plantas y microbios.
Sus antecedentes:
- La resistencia a las enfermedades de las plantas se basa en los genes R que reconocen los genes avr del patógeno.
- La base molecular de la especificidad gen por gen sigue siendo incompletamente entendida.
- Comprender esta interacción es crucial para la protección de los cultivos.
Objetivo del estudio:
- Clonar y caracterizar el gen R del arroz Xa27 y su gen bacteriano afín avrXa27.
- Para dilucidar el mecanismo subyacente a la resistencia a las enfermedades mediada por Xa27.
- Para investigar el papel de la expresión génica diferencial en la especificidad del gen R.
Principales métodos:
- Clonado de los genes Xa27 y avrXa27.
- Análisis comparativo de alelos Xa27 resistentes y sensibles.
- Ensayos de desafío bacteriano con plantas de arroz.
- Análisis de los patrones de expresión génica de Xa27.
- Estudios de expresión ectópica de Xa27.
Principales resultados:
- Las proteínas idénticas están codificadas por alelos Xa27 resistentes y susceptibles.
- La expresión de Xa27 se induce específicamente en el arroz cuando es provocado por Xanthomonas oryzae pv. las oryzae que llevan el avrXa27.
- AvrXa27 es un efector tipo III localizado en el núcleo.
- La expresión inducida de Xa27 está localizada en los tejidos infectados.
- La expresión ectópica de Xa27 confiere resistencia a cepas patógenas compatibles.
Conclusiones:
- La especificidad del arroz Xa27 implica la expresión génica diferencial desencadenada por el efector AvrXa27.
- El efector AvrXa27 induce la expresión localizada del gen de resistencia Xa27.
- Este estudio proporciona información sobre los mecanismos moleculares de la función y la especificidad del gen R de las plantas.
Videos de Conceptos Relacionados
01:56Riboswitches
Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
02:15Experimental RNAi
RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
02:50Transgenic Plants
Recombinant DNA technology called transgenesis is often used to add a foreign gene or remove a detrimental gene from an organism. Such genetically modified organisms are called transgenic organisms.
The first-ever transgenic plant was a tobacco plant developed in 1983 that showed resistance against the tobacco mosaic virus. Since then, many transgenic plants have been developed and commercialized for improving the agricultural, ornamental, and horticultural value of a crop plant. Transgenic...
The first-ever transgenic plant was a tobacco plant developed in 1983 that showed resistance against the tobacco mosaic virus. Since then, many transgenic plants have been developed and commercialized for improving the agricultural, ornamental, and horticultural value of a crop plant. Transgenic...
01:25Cell Signaling in Plants
Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
01:23Stringent Response in E. coli
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...