Department of Genetics, University of Valencia, Dr. Moliner 50, 46100, Burjassot, (Valencia), Spain.
CREA-Research Centre for Cereal and Industrial Crops, Via di Corticella 133, 40128, Bologna, Italy.
Plant Physiol Biochem. 2024 Dec;217:109195. doi: 10.1016/j.plaphy.2024.109195. Epub 2024 Oct 12.
Potato (Solanum tuberosum L.) is nowadays an important component of diversified cropping systems due to its adaptability, yielding capacity, and nutrition contribution. Breeding programs aiming at raising potato's nutritional value have mainly focused on the accumulation in potato tubers of health-promoting phytochemicals such as anthocyanins. In different plant species, increased amounts of anthocyanins in vegetative tissues have been associated with enhanced tolerance to abiotic and biotic stresses that challenge agrifood systems in the current context of global climate change. In the present study, we aimed at gaining insight into the effect of anthocyanin accumulation on the potato plants response to drought stress using three different potato genotypes with differential canopy and tuber pigmentation: the purple fleshed commercial variety Bleuet; the red fleshed breeding clone DAR170; and the non-pigmented commercial variety Monalisa. The varieties Bleuet and DAR170 exhibiting higher anthocyanin content in vegetative tissues than the Monalisa variety showed a remarkable inhibition of stem growth development under drought stress treatment suggestive of an anthocyanin-mediated physiological shift from growth to resilience as a mechanism of stress tolerance. The results of the expression analysis of stu-miR156a and its target StSPL9 gene in the potato plants with different anthocyanin content, as well as their change in response to drought stress support the participation of the conserved miR156-SPL9 regulatory module in coordinating potato plants development and plant responses to drought stress, involving precise fine-tuning of anthocyanin biosynthesis.
马铃薯（Solanum tuberosum L.）因其适应性、产量和营养价值，如今已成为多元化种植系统的重要组成部分。旨在提高马铃薯营养价值的育种计划主要集中在提高马铃薯块茎中有益健康的植物化学物质如花色苷的积累上。在不同的植物物种中，增加营养组织中的花色苷含量与提高对生物和非生物胁迫的耐受性有关，这些胁迫在当前全球气候变化的背景下挑战着农业食品系统。在本研究中，我们旨在深入了解花色苷积累对不同冠层和块茎色素马铃薯基因型对干旱胁迫响应的影响：紫色果肉商业品种 Bleuet；红色果肉的育种克隆 DAR170；以及非色素商业品种 Monalisa。Bleuet 和 DAR170 这两个品种的营养组织中花色苷含量高于 Monalisa 品种，在干旱胁迫处理下茎生长发育受到显著抑制，表明花色苷介导了一种从生长到弹性的生理转变，作为一种胁迫耐受机制。不同花色苷含量的马铃薯植株 stu-miR156a 及其靶基因 StSPL9 的表达分析结果，以及它们对干旱胁迫的响应变化，支持保守的 miR156-SPL9 调控模块参与协调马铃薯植株发育和对干旱胁迫的植物响应，涉及花色苷生物合成的精确微调。
