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Pseudomonas oryzihabitans endofítico CB24 Aumenta la fotosíntesis a través de la reprogramación de lípidos impulsada
Nikky Deepa1,2, Shivam Chauhan1,2, Prabodh K Trivedi2,3
1Division of Crop Production and Protection, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India.
Plant, cell & environment
|August 29, 2025
Resumen
Las bacterias endofíticas Pseudomonas oryzihabitans mejoran el crecimiento de Pelargonium graveolens al aumentar el metabolismo de los lípidos y la producción de aceite esencial. Esta asociación microbiana mejora la fisiología y la fitoquímica de las plantas para aumentar el rendimiento.
Área de la Ciencia:
- Interacciones entre plantas y microbios
- Microbiología endofítica
- Bioquímica de las plantas
Sus antecedentes:
- Pelargonium graveolens es apreciado por su aceite esencial.
- Las asociaciones endosimbióticas influyen en la fisiología y la fitoquímica de las plantas.
- Los mecanismos de modulación mediada por endofitos están en gran parte inexplorados.
Objetivo del estudio:
- Investigar el impacto de la inoculación de Pseudomonas oryzihabitans CB24 en P. graveolens.
- Esclarecer los mecanismos detrás de los cambios inducidos por los endofitos en el metabolismo de las plantas.
- Para entender cómo los endofitos regulan el crecimiento y el rendimiento de las plantas.
Principales métodos:
- Inoculación de P. graveolens con P. oryzihabitans CB24.
- Análisis de la dinámica de los lípidos vegetales y la expresión génica.
- Medición de la actividad enzimática y acumulación de metabolitos.
Principales resultados:
- P. oryzihabitans CB24 aumentó los glicerolipidos de los cloroplastos (MGDG, SQDG) al mejorar la síntesis de precursores y la regulación al alza de los genes metabólicos clave (plc, MGD1, SQD2).
- Se observó un aumento de la regulación de los genes involucrados en los complejos de recolección de luz (LHCA2, LHCA1, PsaA, PetE, PetF, PsbO) y un aumento de la actividad de RuBisCO.
- La expresión mejorada del gen DXS condujo a un aumento de la producción de monoterpenoides (geraniol, linalool), desplazando el metabolismo hacia la biosíntesis secundaria.
Conclusiones:
- P. oryzihabitans CB24 endofítico altera significativamente el metabolismo de los lípidos de P. graveolens y la producción de metabolitos secundarios.
- El endófito mejora los procesos fisiológicos de las plantas, incluida la absorción de nitratos, la asimilación de carbono y la capacidad antioxidante.
- Esta asociación microbiana conduce a mejoras sustanciales en el crecimiento, desarrollo y rendimiento de aceite esencial de la planta huésped.
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