ArticleJournal of experimental botany2026
Combination of abiotic stresses accelerates photoprotection in exceptionally chilling-tolerant C4 grass by fine-tuning the content of multiple pigments.
Article in Journal of experimental botany, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
C4 grasses are crucial for food and biofuel production. Originating from warm regions of the world, C4-photosynthesizing plants typically exhibit poor chilling tolerance. Some C4 grasses of Miscanthus are recognized for their exceptional chilling tolerance; however, the mechanism behind it is not fully understood. Here, we hypothesize that the rapid adjustment of leaf pigment composition contributes to mechanisms that protect photosynthesis during the initial short-term response to chilling. Miscanthus accessions with documented contrasting levels of chilling tolerance were subjected to chilling under dark and light conditions with or without nutrient limitations. The changes in pigment composition were assessed by hyperspectral indexes and molecularly validated. Our results showed that a high-chilling-tolerant accession accumulates zeaxanthin and anthocyanins while reducing chlorophyll content at the end of a night of chilling treatment when grown on low-fertility soil. Interestingly, at the end of the night, low-soil fertility alone was able to induce a significant difference in zeaxanthin accumulation between accessions. Zeaxanthin accumulated during the night led to 38% faster non-photochemical quenching on the following morning. Transcriptional differential regulation of enzymes involved in pigment anabolism and catabolism supports the dynamic adjustment in leaf pigment composition. The investigated changes in pigment composition can inspire new strategies to engineer crops for better stress resistance.
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