Combination of abiotic stresses accelerates photoprotection in exceptionally chilling tolerant C4 grass by fine tuning content of multiple pigments

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ID: 314538
2026
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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 high-chilling-tolerant accession accumulates zeaxanthin and anthocyanins while reducing chlorophyll content at the end of chilling night when grown on the 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. Night-accumulated zeaxanthin led to 38% faster NPQ 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.
Reference Key
openalex_W7161953017 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Benjamin Turc, Asha Kumari, Maria Carter, Katarzyna Glowacka
Journal Journal of experimental botany
Year 2026
DOI
10.1093/jxb/erag236
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