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<p>Self-incompatibility restricts the genetic diversity and stability of <i>Prunus sibirica</i>. Applying plant growth regulators can promote pollen tube growth and improve the fruit-setting rate. However, few studies have investigated the application of exogenous gibberellin 3 (GA<sub>3</sub>) to improve the self-compatibility of <i>P. sibirica</i>. Therefore, the present study treated self-incompatible <i>P. sibirica</i> clone 508 with an exogenous GA<sub>3</sub> spray with the aim of examining the impacts on the fruit-setting rate and physiological and biochemical indices. Spraying 50, 100, and 200 mg·L<sup>− 1</sup> GA<sub>3</sub> resulted in self-pollination fruit-setting rates of 15.37, 19.36, and 9.65%, respectively, which were significantly higher than that under the control (3.55%). The pollen tube elongation rate reached 83.29% under the 100 mg·L<sup>− 1</sup> GA<sub>3</sub> treatment compared with 43.38% under the control. The endogenous auxin (IAA), zeatin riboside (ZR), and GA<sub>3</sub> contents were significantly higher under the GA<sub>3</sub> treatments than under the control, whereas the endogenous abscisic acid (ABA) and jasmonic acid (JA) contents were significantly lower; thus, a high (IAA+GA<sub>3</sub>+ZR)/(ABA + JA) ratio was maintained. The antioxidant enzyme activity in the pistils was higher under the GA<sub>3</sub> treatments than under the control, and the activity of callose synthase (CS) remained at a high and stable level. In general, exogenous GA<sub>3</sub> may regulate hormone levels, increase antioxidant enzyme activity, and maintain higher CS activity in pistils. This physiological regulation considerably boosts pollen tube growth, which subsequently results in a higher self-pollination fruit-setting rate and effectively improves self-compatibility in <i>P. sibirica</i>.</p>

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Effect of Exogenous GA3 on Pollen Tube growth, Endogenous Hormone Levels and Enzyme Activity in the Pistil in Self-Incompatible Prunus sibirica

  • 期刊论文

  • 发表日期：

    2026年3月24日

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  • Junxin Feng,
  • Yongqiang Sun,
  • Yuncheng Zhang,
  • Jing Wang,
  • Jianhua Chen,
  • Shengjun Dong

摘要

Self-incompatibility restricts the genetic diversity and stability of Prunus sibirica. Applying plant growth regulators can promote pollen tube growth and improve the fruit-setting rate. However, few studies have investigated the application of exogenous gibberellin 3 (GA3) to improve the self-compatibility of P. sibirica. Therefore, the present study treated self-incompatible P. sibirica clone 508 with an exogenous GA3 spray with the aim of examining the impacts on the fruit-setting rate and physiological and biochemical indices. Spraying 50, 100, and 200 mg·L− 1 GA3 resulted in self-pollination fruit-setting rates of 15.37, 19.36, and 9.65%, respectively, which were significantly higher than that under the control (3.55%). The pollen tube elongation rate reached 83.29% under the 100 mg·L− 1 GA3 treatment compared with 43.38% under the control. The endogenous auxin (IAA), zeatin riboside (ZR), and GA3 contents were significantly higher under the GA3 treatments than under the control, whereas the endogenous abscisic acid (ABA) and jasmonic acid (JA) contents were significantly lower; thus, a high (IAA+GA3+ZR)/(ABA + JA) ratio was maintained. The antioxidant enzyme activity in the pistils was higher under the GA3 treatments than under the control, and the activity of callose synthase (CS) remained at a high and stable level. In general, exogenous GA3 may regulate hormone levels, increase antioxidant enzyme activity, and maintain higher CS activity in pistils. This physiological regulation considerably boosts pollen tube growth, which subsequently results in a higher self-pollination fruit-setting rate and effectively improves self-compatibility in P. sibirica.