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<p>Heat stress is a major abiotic factor limiting tomato productivity, increasing the demand for heat-tolerant cultivars. This study aimed to investigate the relationship between pollen and fruit yield traits under heat stress conditions in tomatoes with different fruit sizes. Experiments were conducted in growth chambers and greenhouses over two years, using tomato genotypes categorized by fruit sizes: large (&gt; 100&#xa0;g), medium (50–100&#xa0;g), and cherry (&lt; 50&#xa0;g). Heat stress significantly reduced pollen viability and the number of pollen grains in most accessions. The number of fruits and fruit yield were consistently lower under high temperature compared to control temperature conditions. Significant correlations were observed between pollen viability and the number of fruits and fruit yield in large and medium fruit accessions under high temperature, suggesting that pollen viability can be a reliable indicator for selecting heat-tolerant genotypes in these fruit types. In contrast, no significant correlation was found between pollen traits and fruit yield in cherry fruit accessions, where the number of fruits per truss was a more appropriate target trait for heat tolerance. These findings indicate that different strategies may be needed for breeding heat-tolerant tomato cultivars based on fruit size. Selecting tomato lines with high pollen viability under high temperature conditions could enhance the selection process for heat-tolerant genotypes with large tomatoes, and the use of impedance flow cytometry for testing pollen viability can streamline the breeding process for heat-tolerant tomatoes.</p>

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Pollen traits significantly associated with fruit yield traits under heat stress among large fruit but not cherry fruit tomatoes

  • 期刊论文

  • 发表日期：

    2025年5月21日

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  • Jiwon Kim,
  • Hyobong Jeong,
  • Sumin Kim,
  • Wonbyoung Chae

摘要

Heat stress is a major abiotic factor limiting tomato productivity, increasing the demand for heat-tolerant cultivars. This study aimed to investigate the relationship between pollen and fruit yield traits under heat stress conditions in tomatoes with different fruit sizes. Experiments were conducted in growth chambers and greenhouses over two years, using tomato genotypes categorized by fruit sizes: large (> 100 g), medium (50–100 g), and cherry (< 50 g). Heat stress significantly reduced pollen viability and the number of pollen grains in most accessions. The number of fruits and fruit yield were consistently lower under high temperature compared to control temperature conditions. Significant correlations were observed between pollen viability and the number of fruits and fruit yield in large and medium fruit accessions under high temperature, suggesting that pollen viability can be a reliable indicator for selecting heat-tolerant genotypes in these fruit types. In contrast, no significant correlation was found between pollen traits and fruit yield in cherry fruit accessions, where the number of fruits per truss was a more appropriate target trait for heat tolerance. These findings indicate that different strategies may be needed for breeding heat-tolerant tomato cultivars based on fruit size. Selecting tomato lines with high pollen viability under high temperature conditions could enhance the selection process for heat-tolerant genotypes with large tomatoes, and the use of impedance flow cytometry for testing pollen viability can streamline the breeding process for heat-tolerant tomatoes.