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Evaluación exhaustiva de germoplasma de maíz para la tolerancia a álcalis durante la germinación

Zhuyun Pan^1,2, Zhiqiang Ge^1,2, Fengming Gao^1,2

¹Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China.

Frontiers in plant science

|January 28, 2026

Resumen

El estrés alcalino afecta gravemente el crecimiento del maíz. Este estudio desarrolló un sistema de evaluación que identifica el índice de germinación y el peso seco del brote como indicadores clave para la cría de variedades de maíz tolerantes a los álcalis.

Área de la Ciencia:

Ciencia Agrícola
Ciencia de las Plantas
Genética

Sus antecedentes:

El estrés alcalino es un desafío agrícola importante, especialmente para el maíz, que inhibe la germinación y el crecimiento.
El desarrollo de métodos robustos para evaluar la tolerancia a los álcalis es crucial para la mejora del maíz y la resiliencia de los cultivos.

Objetivo del estudio:

Establecer un sistema preciso e integrado para evaluar la tolerancia a los álcalis en el germoplasma de maíz.
Identificar los rasgos morfológicos clave que contribuyen a la tolerancia a los álcalis en el maíz.

Principales métodos:

Se evaluaron 42 accesiones de maíz bajo estrés alcalino simulado (100 mM).
Se empleó un marco analítico integral que incluye PCA, análisis de función de membresía, regresión escalonada, análisis de clúster y discriminante.
Se utilizó el método de Lindeman-Merenda-Gold para cuantificar las contribuciones de los rasgos a la tolerancia a los álcalis.

Principales resultados:

El estrés alcalino inhibió significativamente la germinación del maíz y el crecimiento temprano de las plántulas.
Se identificaron el índice de germinación (GI) y el peso seco del brote (SDW) como los principales determinantes de la tolerancia a los álcalis.
La longitud de la raíz (RL) y el peso fresco de la raíz (RFW) también mostraron contribuciones significativas a la tolerancia.

Conclusiones:

El sistema de evaluación integrado clasifica eficazmente el germoplasma de maíz en función de la tolerancia a los álcalis.
Los rasgos morfológicos clave identificados proporcionan una base para la selección y mejora de maíz tolerante a los álcalis para una agricultura sostenible en entornos alcalinos.

Palabras clave:

análisis LMG tolerancia a álcalis evaluación de germoplasma maíz germinación de semillas

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