Mizu-kussei1 (MIZ1) plays a crucial role in root hydrotropism, but it is still unclear whether auxin-mediated gravitropism is involved in MIZ1-modulated root hydrotropism. This study aimed to investigate whether the hydrotropism of the Arabidopsis miz1 mutants could be restored through pharmacological inhibition of auxin transport or genetic modification in root gravitropism. Our findings indicate that the hydrotropic defects of miz1 mutant can be partly recovered by using an auxin transport inhibitor. Furthermore, miz1/pin2 double mutants exhibit more pronounced defects in root gravitropism compared to the wild type, while still displaying a normal hydrotropic response similar to the wild type. These results suggest that the elimination of gravitropism enables miz1 roots to become hydrotropically responsive to moisture gradients.

Mizu-kusei1 (MIZ1) 在根向水性中起着至关重要的作用，但目前尚不清楚生长素介导的向地性是否参与 MIZ1 调节的根向水性。本研究旨在探讨拟南芥 miz1 突变体的向水性是否可以通过生长素运输的药理抑制或根部向地性的遗传修饰来恢复。我们的研究结果表明，使用生长素转运抑制剂可以部分恢复 miz1 突变体的水溶缺陷。此外，与野生型相比，miz1/pin2双突变体在根向重力性方面表现出更明显的缺陷，同时仍然表现出与野生型相似的正常向水反应。这些结果表明，向地性的消除使得 miz1 根能够对湿度梯度产生向水性响应。