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<p>Water deficit can reduce sweet potato yield and quality. The development of drought-tolerant cultivars is strategic. The objective was to quickly identify, in a greenhouse, drought-tolerant sweet potato genotypes. Fifty-six accessions and cultivars were evaluated for plant wilting levels using scales of scores and physiological characteristics. Two commercial controls, ‘Canadense’ and ‘Mineirinha’, were used. The first stage was implemented in a randomized block design with four replications. Water deficiency stress was induced over 21&#xa0;days by suspending irrigation. At the end of the experiment, the number of plants with lower tolerance indices and the average number of days required for wilting with the onset of leaf drying were counted. From this first stage, 20 genotypes were selected to evaluate the physiological performance under irrigation suspension conditions at 7, 14, and 21&#xa0;days after stress imposition. The second experiment was conducted in a completely randomized design with two replicates. There was interaction between genotypes and the evaluations for water potential and chlorophyll <i>a</i> fluorescence. Some genotypes were able to maintain reasonable values for most traits throughout the water restriction and have the potential for inclusion in breeding programs aiming at drought tolerance. The most promising genotypes are CIP-440224, CIP-440186, CIP-440003, CIP-187012/2, Canadense, IAC Clara, and Mineirinha.</p>

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Pre-screening sweet potato genotypes for drought tolerance through assessment of physiological traits

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月9日

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  • Elisa Patrícia Ramos de Melo,
  • Vitória Jaqueline Signorini,
  • Dario Sousa da Silva,
  • João Lucas Pires Leal,
  • Beatriz Viezel Moraes,
  • Maria Albertina Monteiro dos Reis,
  • Ana Claudia Pacheco,
  • Edgard Henrique Costa Silva

摘要

Water deficit can reduce sweet potato yield and quality. The development of drought-tolerant cultivars is strategic. The objective was to quickly identify, in a greenhouse, drought-tolerant sweet potato genotypes. Fifty-six accessions and cultivars were evaluated for plant wilting levels using scales of scores and physiological characteristics. Two commercial controls, ‘Canadense’ and ‘Mineirinha’, were used. The first stage was implemented in a randomized block design with four replications. Water deficiency stress was induced over 21 days by suspending irrigation. At the end of the experiment, the number of plants with lower tolerance indices and the average number of days required for wilting with the onset of leaf drying were counted. From this first stage, 20 genotypes were selected to evaluate the physiological performance under irrigation suspension conditions at 7, 14, and 21 days after stress imposition. The second experiment was conducted in a completely randomized design with two replicates. There was interaction between genotypes and the evaluations for water potential and chlorophyll a fluorescence. Some genotypes were able to maintain reasonable values for most traits throughout the water restriction and have the potential for inclusion in breeding programs aiming at drought tolerance. The most promising genotypes are CIP-440224, CIP-440186, CIP-440003, CIP-187012/2, Canadense, IAC Clara, and Mineirinha.