关键词: 香稻, 超声波, 秧苗素质, 抗逆性, 产量, 2-乙酰-1-吡咯啉

Abstract:

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.

Key words: fragrant rice, ultrasound, seedling quality, stress resistance, yield, 2-acetyl-1-pyrroline