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<p>This study investigates the photosynthetic physiological basis for reduced potato (<i>Solanum tuberosum</i> L.) yield under the high temperature stress on the aerial or belowground parts alone of plant. Using two potato varieties (Qingshu 9 (Qs9) and Dian 187 (D187)) with differing heat resistance, we designed four treatments: high-temperature (30 ± 0.5&#xa0;°C) stress on the aerial parts (AH), high-temperature stress on the belowground parts (BH), high-temperature stress on the entire plant (EH), and a control with normal temperature (20 ± 0.5&#xa0;°C) on the entire plant (EN). During the tuberization stage, we measured photosynthetic characteristics including canopy area, gas exchange parameters, and accumulation of dry matter. The results showed that compared with the EN treatment, the AH-treated potato plants prolonged the growth period of Qs9 and D187 by 11 and 14&#xa0;days, respectively, significantly reduced the canopy area by 24.32 and 34.33 cm<sup>2</sup> respectively, increased the rate of light and dark respiration by 1.32, 1.39&#xa0;μmol∙m<sup>−2</sup>∙s<sup>−1</sup> and 0.45, 0.75&#xa0;μmol∙m<sup>−2</sup>∙s<sup>−1</sup> respectively, and the net photosynthetic rate and photosynthetic pigment content of Qs9 were significantly decreased by 2.14&#xa0;μmol∙m<sup>−2</sup>∙s<sup>−1</sup> and 0.44&#xa0;mg∙g<sup>−1</sup> respectively. These changes led to a notable reduction in the accumulation of dry matter under AH treatment. No significant differences were observed in photorespiration, dark respiration rates, net photosynthetic rate, and photosynthetic pigment content of Qs9 and D187 between EN and BH treatments. However, BH-treated plants showed the accumulation of dry matter decreased by 6.52% and 41.04% respectively, and the distribution ratio of dry matter in leaves and stems significantly increased by 16.49, 4.08% and 29.85, 9.42% respectively, and the growth period shortened by 11 and 12&#xa0;days, respectively. Based on the above results, it can be concluded that reduced tuber yield under AH treatment is primarily due to increased respiratory consumption. In contrast, the yield reduction under BH treatment arises from impaired transport of photosynthetic products from leaves to tubers, leading to dry matter accumulation in leaves and stems.</p>

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Analysis of Different Photosynthetic Characteristics in Different Plant Parts of Potato (Solanum tuberosum L.) During the Tuberization Stage Under High Temperature Stress Treatment

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Haitao Ma,
  • Teng Tian,
  • Baochen Liu,
  • Jinhua Zhou

摘要

This study investigates the photosynthetic physiological basis for reduced potato (Solanum tuberosum L.) yield under the high temperature stress on the aerial or belowground parts alone of plant. Using two potato varieties (Qingshu 9 (Qs9) and Dian 187 (D187)) with differing heat resistance, we designed four treatments: high-temperature (30 ± 0.5 °C) stress on the aerial parts (AH), high-temperature stress on the belowground parts (BH), high-temperature stress on the entire plant (EH), and a control with normal temperature (20 ± 0.5 °C) on the entire plant (EN). During the tuberization stage, we measured photosynthetic characteristics including canopy area, gas exchange parameters, and accumulation of dry matter. The results showed that compared with the EN treatment, the AH-treated potato plants prolonged the growth period of Qs9 and D187 by 11 and 14 days, respectively, significantly reduced the canopy area by 24.32 and 34.33 cm2 respectively, increased the rate of light and dark respiration by 1.32, 1.39 μmol∙m−2∙s−1 and 0.45, 0.75 μmol∙m−2∙s−1 respectively, and the net photosynthetic rate and photosynthetic pigment content of Qs9 were significantly decreased by 2.14 μmol∙m−2∙s−1 and 0.44 mg∙g−1 respectively. These changes led to a notable reduction in the accumulation of dry matter under AH treatment. No significant differences were observed in photorespiration, dark respiration rates, net photosynthetic rate, and photosynthetic pigment content of Qs9 and D187 between EN and BH treatments. However, BH-treated plants showed the accumulation of dry matter decreased by 6.52% and 41.04% respectively, and the distribution ratio of dry matter in leaves and stems significantly increased by 16.49, 4.08% and 29.85, 9.42% respectively, and the growth period shortened by 11 and 12 days, respectively. Based on the above results, it can be concluded that reduced tuber yield under AH treatment is primarily due to increased respiratory consumption. In contrast, the yield reduction under BH treatment arises from impaired transport of photosynthetic products from leaves to tubers, leading to dry matter accumulation in leaves and stems.