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<p>Abscisic acid (ABA) plays an important role in adaptive responses to drought. The aim of this study was to examine the effects of long-term moderate drought on ABA-contrasting tomato genotypes (Ailsa Craig and <i>flacca</i> mutant) in relation to plant growth and fruit quality. Our results showed distinct genotypic differences in ABA-mediated responses. The drought-induced stomata response associated with elevated ABA concentration in leaves and roots was more pronounced in the wild type than in the mutant. The wild type exhibited a lower specific leaf area and a greater increase in root dry mass compared with the <i>flacca</i> mutant, suggesting an ABA-mediated response linked to these drought-tolerant traits. A higher antioxidative response in wild type leaves indicated that the ABA mutation reduced the plant’s ability to mitigate oxidative imbalance induced by prolonged drought. The reduction in fruit growth due to drought was associated with the genotypic difference in ABA fruit concentration, but it was compensated by the accumulation of soluble solids, mostly in the wild type. The difference in antioxidative response may be linked to the higher accumulation of vitamin C and ABA concentration in the fruits of the wild type compared with the mutant. These results also imply that ABA accumulation is crucial not only for adaptive responses to prolonged drought at the leaf and root levels but also for modulated responses at the fruit level helping to maintain or even improve tomato quality under adverse conditions.</p>

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ABA-mediated plant growth and fruit quality responses to drought in tomato wild type and flacca mutant

  • 期刊论文

  • 发表日期：

    2025年7月10日

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  • Ivana Radović,
  • Slađana Savić,
  • Milena Marjanović,
  • Zorica Jovanović,
  • Radmila Stikić

摘要

Abscisic acid (ABA) plays an important role in adaptive responses to drought. The aim of this study was to examine the effects of long-term moderate drought on ABA-contrasting tomato genotypes (Ailsa Craig and flacca mutant) in relation to plant growth and fruit quality. Our results showed distinct genotypic differences in ABA-mediated responses. The drought-induced stomata response associated with elevated ABA concentration in leaves and roots was more pronounced in the wild type than in the mutant. The wild type exhibited a lower specific leaf area and a greater increase in root dry mass compared with the flacca mutant, suggesting an ABA-mediated response linked to these drought-tolerant traits. A higher antioxidative response in wild type leaves indicated that the ABA mutation reduced the plant’s ability to mitigate oxidative imbalance induced by prolonged drought. The reduction in fruit growth due to drought was associated with the genotypic difference in ABA fruit concentration, but it was compensated by the accumulation of soluble solids, mostly in the wild type. The difference in antioxidative response may be linked to the higher accumulation of vitamin C and ABA concentration in the fruits of the wild type compared with the mutant. These results also imply that ABA accumulation is crucial not only for adaptive responses to prolonged drought at the leaf and root levels but also for modulated responses at the fruit level helping to maintain or even improve tomato quality under adverse conditions.