以杂交香稻品种青香优19香为材料，设置超声波处理种子（UT，种子发芽前，放入隧道式超声波处理器，在室温下以50 kHz频率处理1.0 min）及非超声波处理种子（CK），用钵苗盘在低温人工气候箱（白天12 h 22 ℃，晚上12 h 12 ℃）、高温人工气候箱（白天12 h 35 ℃，晚上12 h 25 ℃）和室温网室（白天平均温度为25.3 ℃，夜间平均温度为16.6 ℃）培育秧苗，20 d后统一转移至网室盆中种植至成熟，测定苗期秧苗素质、抗逆性相关酶活性、产量和2-AP含量，以探明超声波处理种子对香稻秧苗素质、抗逆性、产量和香气的影响。结果表明，与CK相比，UT处理提高了水稻苗期植株的株高和茎基宽，显著提高了苗期植株的鲜质量和干质量；UT处理后青香优19香的POD、CAT活性和MDA含量与CK相比无显著差异，但SOD活性、结实率和每穗粒数显著提高，从而显著提高产量；UT处理种子显著提高了青香优19香的2-AP含量。

The effects of treating seed with ultrasound on seedling quality, stress resistance, yield, and aroma of fragrant rice were studied using fragrant rice variety Qingxiangyou 19 xiang as the material. Two treatments were set up for the experient: ultrasound treatment (UT, before germination, the seeds placed in a tunneled ultrasonic processor, treated at 50 kHz frequency for 1.0 min at room temperature) and non-ultrasound treatment (CK). The seedling were grown under different temperature conditions: low-temperature artificial climate chamber (12 hours of 22 ℃ during the day and 12 hours of 12 ℃ at night), high-temperature artificial climate chamber (12 hours of 35 ℃ during the day and 12 hours of 25 ℃ at night), and ambient temperature greenhouse (average daytime temperature of 25.3 ℃ and average nighttime temperature of 16.6 ℃). After 20 days of cultivation in seedling trays, the seedlings were transferred to pots in the greenhouse until maturity. The results showed that capared to CK, UT treatment increased the plant height and stem base width of rice seedlings during the seedling stage and significantly improved the fresh weight and dry weight of the seedlings. Compared to CK, the activities of peroxidase(POD), catalase(CAT), and the malondialdehyde(MDA) content in Qingxiangyou 19 xiang treated with UT were not shown significant differences but the superoxide dismutase(SOD) activity was significantly increased. UT treatment significantly increased the grain setting rate and the number of grains per panicle, resulting in a significant increase in yield. UT also significantly increased the 2-acetyl-1-pyrroline (2-AP) content in Qingxiangyou 19 xiang.