Climate change greatly influences coffee production, especially in areas infested with plant‐parasitic nematodes. In this study, coffee genotypes showed differences in their morphological and physiological characteristics when subjected to a water deficit and parasitism by Meloidogyne paranaensis. The cultivar IPR 100 had the largest superficial and volumetric root system area, even when parasitized. The two progenies (MG 0179‐1 and MG 0179‐3) and the cultivar Catuai IAC 62 had a similar surface area (p < .05) when parasitized. However, the root surface area and volume of MG 0179‐3 increased by 96% and 400%, respectively, when parasitized by M. paranaensis. On the other hand, Catuai IAC 62 had a 31% reduction in root surface area. Catuai 62 and IPR 100 showed higher sensitivity to drought when parasitized because of the increased photochemical sensitivity and reduction in photochemical quenching. In MG 0179‐1 and MG 0179‐3, an increase in non‐photochemical quenching occurred in response to stress, indicating that these progenies use a photochemical response to protect photosystem II. In this work, MG 0179‐3, which is resistant to M. paranaensis, was remarkable because, interestingly, the infestation caused an increase in its root surface area. In addition, MG 0179‐3 had relatively good photochemical performance under water deficit and M. paranaensis parasitism.

中文翻译：

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偏南根结线虫侵染和缺水改变咖啡品种和后代的根形态、气体交换和叶绿素荧光

气候变化极大地影响了咖啡生产，特别是在植物寄生线虫感染的地区。在这项研究中，咖啡基因型在遭受水分亏缺和巴拉那根结线虫寄生时表现出其形态和生理特征的差异。栽培品种 IPR 100 具有最大的表面和体积根系面积，即使在寄生时也是如此。当寄生时，两个后代（MG 0179-1 和 MG 0179-3）和栽培品种 Catuai IAC 62 具有相似的表面积（p < .05）。然而，MG 0179-3 的根表面积和体积在被 M. paranaensis 寄生时分别增加了 96% 和 400%。另一方面，Catuai IAC 62 的根表面积减少了 31%。由于光化学敏感性增加和光化学猝灭减少，Catuai 62 和 IPR 100 在寄生时对干旱表现出更高的敏感性。在 MG 0179-1 和 MG 0179-3 中，响应应力发生非光化学猝灭增加，表明这些后代使用光化学反应来保护光系统 II。在这项工作中，对 M. paranaensis 有抗性的 MG 0179-3 非常引人注目，因为有趣的是，侵染导致其根表面积增加。此外，MG 0179-3在水分亏缺和M. paranaensis寄生条件下具有较好的光化学性能。表明这些后代使用光化学反应来保护光系统 II。在这项工作中，对 M. paranaensis 有抗性的 MG 0179-3 非常出色，因为有趣的是，侵染导致其根表面积增加。此外，MG 0179-3在水分亏缺和M. paranaensis寄生条件下具有较好的光化学性能。表明这些后代使用光化学反应来保护光系统 II。在这项工作中，对 M. paranaensis 有抗性的 MG 0179-3 非常引人注目，因为有趣的是，侵染导致其根表面积增加。此外，MG 0179-3在水分亏缺和M. paranaensis寄生条件下具有较好的光化学性能。