Currently, the effects of global warming are one of the most important topics on the agendas of all governments and international economic and scientific organisations on the planet. Temperatures and rainfall will be especially subjected to increasing deregulation, and thus crop yields will be affected according to geographic location. Cellulosic materials, such as bast fibres, are considered one solution to decrease human environmental impact: they are a renewable resource, biodegradable and have a lower carbon emission than synthetic materials. However, their quality, yield and mechanical properties depend on environmental conditions during plant growth. In this paper, we explored the possible impact of seasonal drought linked to future climate change on flax plants and fibre quality. Two batches of the same textile flax plant cultivar were grown under two different field environmental conditions in the same year, one taken as a control under regular climatic conditions and the second one grown under drought stress. Carbon isotopic discrimination reveal an increase in water stress plant of the fibre δ¹³C, reflecting that plants are indeed suffering from drought stress from a physiological point of view. We characterized the mechanical properties, biochemistry and morphology parameters at both the stem and technical fibre scales. Our results showed that the plants of the two batches were morphologically different and that the drought-stressed plants were smaller, mainly in terms of the height of the stem (−28%) and diameter (−16%). Biochemical analyses highlighted a contrasting lignin content between the two batches. A difference in protein content was also measured, with an increased amount in stressed flax plants, with contrasting distributions revealed by tyrosine and tryptophan monitored by synchrotron UV fluorescence. In addition, polysaccharide composition was also quantified with an increase in mannose and an important decrease in glucose in the drought-stressed technical fibres. Surprisingly, despite the difference in biochemistry composition and morphological parameters, the mechanical properties of elementary flax fibres extracted from the two batches were not significantly different. This suggests that drought can affect the yield and biochemistry of the extracted technical flax fibres but does not necessarily impact the longitudinal mechanical performance of single fibres.

目前，全球变暖的影响是地球上所有政府和国际经济和科学组织议程上最重要的话题之一。气温和降雨量将特别受到放松管制的影响，因此作物产量将因地理位置而受到影响。纤维素材料，例如韧皮纤维被认为是减少人类环境影响的一种解决方案：它们是一种可再生资源，可生物降解，并且碳排放量低于合成材料。然而，它们的质量、产量和机械性能取决于植物生长过程中的环境条件。在本文中，我们探讨了与未来气候变化相关的季节性干旱对亚麻植物和纤维质量的可能影响。同一年在两种不同的田间环境条件下种植两批相同的纺织亚麻植物品种，一批在常规气候条件下作为对照，另一批在干旱胁迫下种植。碳同位素鉴别显示纤维δ ¹³的水分胁迫植物增加C，从生理角度反映植物确实遭受干旱胁迫。我们在茎和工业纤维尺度上对机械性能、生物化学和形态参数进行了表征。我们的研究结果表明，两批植物形态不同，干旱胁迫植物较小，主要表现为茎高（-28%）和直径（-16%）。生化分析突出了两批之间对比鲜明的木质素含量。还测量了蛋白质含量的差异，在受胁迫的亚麻植物中含量增加，同步加速器紫外荧光监测的酪氨酸和色氨酸显示出对比分布。此外，多糖干旱胁迫的工业纤维中甘露糖的增加和葡萄糖的显着降低也对成分进行了量化。令人惊讶的是，尽管生化成分和形态参数存在差异，但从两批提取的基本亚麻纤维的机械性能没有显着差异。这表明干旱会影响提取的工业亚麻纤维的产量和生物化学，但​​不一定会影响单纤维的纵向机械性能。