PDF(Pubmed)
Abstract：
Water deficit stress triggers various physiological and biochemical changes in plants, substantially affecting both overall plant defense response and thus nutritional quality of tomatoes. The aim of this study was to assess the antioxidant defense response and nutritional quality of different tomato genotypes under water deficit stress. In this study, six tomato genotypes were used and subjected to water deficit stress by withholding water for eight days under glass house conditions. Various physiological parameters from leaves and biochemical parameters from tomato fruits were measured to check the effect of antioxidant defense response and nutritional value. Multi-trait genotype-ideotype distance index (MGIDI) was used for the selection of genotypes with improved defense response and nutritional value under water deficit stress condition. Results indicated that all physiological parameters declined under stress conditions compared to the control. Notably, NBH-362 demonstrated resilience to water deficit stress, improving both defense response and nutritional quality which is evident by an increase in proline (16.91%), reducing sugars (20.15%), total flavonoids (10.43%), superoxide dismutase (24.65%), peroxidase (14.7%), and total antioxidant capacity (29.9%), along with a decrease in total oxidant status (4.38%) under stress condition. Overall, the findings suggest that exposure to water deficit stress has the potential to enhance the nutritional quality of tomatoes. However, the degree of this enhancement is contingent upon the distinct genetic characteristics of various tomato genotypes. Furthermore, the promising genotype (NBH-362) identified in this study holds potential for future utilization in breeding programs.
摘要：
水分亏缺胁迫引发植物的各种生理生化变化,大大影响整体植物的防御反应，从而影响西红柿的营养质量。本研究旨在评估不同基因型番茄在水分亏缺胁迫下的抗氧化防御反应和营养品质。在这项研究中,使用了六种番茄基因型，并通过在玻璃屋条件下停水八天来承受缺水胁迫。测量了叶片的各种生理参数和番茄果实的生化参数，以检查抗氧化剂防御反应和营养价值的影响。多性状基因型-理想型距离指数（MGIDI）用于在水分亏缺胁迫条件下选择防御反应和营养价值提高的基因型。结果表明，与对照组相比，所有生理参数在应激条件下均下降。值得注意的是,NBH-362表现出对水分亏缺压力的抵抗力，提高防御反应和营养质量，这从脯氨酸的增加(16.91%)中可以看出，还原糖（20.15%），总黄酮（10.43%），超氧化物歧化酶（24.65%），过氧化物酶（14.7%），和总抗氧化能力(29.9%)，在胁迫条件下，总氧化剂状态降低(4.38%)。总的来说,研究结果表明，暴露于水分亏缺的压力有可能提高西红柿的营养质量。然而,这种增强的程度取决于各种番茄基因型的独特遗传特征。此外，在这项研究中确定的有希望的基因型（NBH-362）具有未来在育种计划中利用的潜力。
