Effects of Spraying Exogenous Salicylic Acid on Growth of Rice Seedlings Under Low Temperature Stress

doi:10.11924/j.issn.1000-6850.casb2024-0726

Abstract

Abstract:

To alleviate the damage of low-temperature stress to rice seedlings, a rice cultivar ‘Qingxiangyou 19 xiang’ was used to compare the effects of different concentrations of salicylic acid (0, 10, 100, 1000 µmol/L) by leaf spraying on the biomass, root system architecture, malondialdehyde (MDA), proline and antioxidant enzyme activities of rice seedlings under low temperature (8℃) stress. The results showed that with the increase of salicylic acid concentration, the root system architecture, plant height, and biomass of the rice seedlings under low temperature treatment presented a trend of first increasing and then decreasing, and the indicators were highest in the seedlings sprayed with 10 µmol/L salicylic acid. Compared with the control, the total root length and plant height of rice seedlings increased by 36.49% and 17.14%, respectively, and the root biomass, shoot biomass, and total biomass increased by 46.02%, 16.60%, and 21.93%, the proline content and the peroxidase (POD) activity increased by 529.87% and 40.6%, the MDA content reduced by 37.04%, under 10 µmol/L salicylic acid treatment. The above results indicated that the 10 µmol/L salicylic acid alleviated the low-temperature stress of rice seedlings by increasing POD activity and proline content, and by reducing MDA content.

Key words: salicylic acid, rice, low-temperature stress, proline, malondialdehyde, antioxidant enzyme

ZHU Feifei, LU Chusheng, ZHANG Yufen, QIN Yuanyu, YIN Yuanhong, PENG Binfeng, YE Qunhuan, ZHONG Xuhua, PAN Junfeng, LIU Yanzhuo, HU Xiangyu, HU Rui, LI Meijuan, WANG Xinyu, LIANG Kaiming, FU Youqiang. Effects of Spraying Exogenous Salicylic Acid on Growth of Rice Seedlings Under Low Temperature Stress[J]. Chinese Agricultural Science Bulletin, 2025, 41(33): 6-13.

Figures/Tables 5

References 41

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