Regulatory insights and first report of fructan accumulation in early vegetative sunflower lines contrasting in osmotic adjustment under water deficit.

In early vegetative sunflower (Helianthus annuus L.) stems, inulin-type fructan accumulation is evidenced by detecting 1-kestose and nystose under both water conditions, with LOA showing higher short-chain fructans under stress.

• Why it matters: Water deficit limits early growth in sunflower, yet how carbohydrate metabolism and fructan accumulation relate to osmotic adjustment remains unclear, limiting targets for improving drought performance.
• What they did: Two inbred lines with contrasting osmotic adjustment (HOA vs LOA) were exposed to short-term water deficit during early vegetative growth, and carbohydrate profiles were measured alongside proline and transcriptomic support for fructan synthesis genes (1-SST, 1-FFTs).
• The result: HOA plants showed greater root growth and proline contribution to osmotic potential, while chromatographic profiling linked water stress to higher short-chain fructans in LOA; drought also induced 1-SST expression in shoots across both genotypes and in roots only in the drought-tolerant line.

AI summary of the abstract · may contain errors · not medical advice · read the paper.