Multi-Level Assessment of Environmental Effects on Winter Wheat
Keywords:
winter wheat, abiotic stress, miRNAs markers, production, NDVIAbstract
This study aimed to evaluate the variability in agronomic performance and physiological and molecular markers indicative of genomic responses in the winter wheat (Triticum aestivum L.) exposed to a gradient of environmental radiation. Field analyses and plant sampling were conducted at two locations situated 500 m and 1000 m from a nuclear power station (NPS). Parameters assessed included the normalized difference vegetation index (NDVI), plant density, spike number per plant, grain number per spike, thousand grain weight, and overall grain yield. NDVI values exhibited a declining trend from growth stage of Biologische Bundesanstalt, Bundessortenamt und CHemische Industrie (BBCH) 32 to BBCH 51 at both sites. Notably, a marked increase in NDVI was observed at BBCH 59 and the onset of flowering (BBCH 61). Vegetation indices and yield-related traits were consistently higher at the site located further from the radiation source. Genomic analysis of stress-sensitive markers revealed elevated amplification of miR168-based loci during early developmental stages regardless of the distance of the cultivation location. On the other hand, elevated amplification of miR408-based loci was observed during the transition to flowering and flowering stage. This corresponds with observations of agronomic and physiological indicators, as well as background radiation records. Multivariate correlation showed that miR168-based loci of 150 base pairs (bp) or 200 bp, respectively and miR408-based locus of 150 bp have moderate to strong non-linear relationship to developmental stage and growth location. These findings suggest that early growth stages of winter wheat are particularly sensitive to environmental stress, as reflected in both NDVI metrics and microRNA-based (miRNA) markers. The integration of agronomic, physiological and molecular analyses provides a robust framework for assessing crop responses to radiation-induced stress gradients.
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