【摘要】 为缓解低温胁迫对水稻幼苗的伤害，本研究以‘青香优19香’为试材，设置4个水杨酸浓度(0、10、100、1000μmol/L)，采用叶片喷施方式，研究不同浓度水杨酸对8℃低温胁迫下水稻幼苗生物量、根系形态及丙二醛含量、脯氨酸含量、抗氧化酶活性等指标的影响。结果发现，低温胁迫下随水杨酸浓度的增加，根系形态、株高和生物量均呈先增后降的趋势，10μmol/L水杨酸处理最高。与对照相比，10μmol/L水杨酸处理的水稻幼苗总根长、根表面积、根体积和株高分别增加了36.49%、43.06%、50.67%和17.14%，根系生物量、地上部生物量和总生物量分别增加了46.02%、16.60%和21.93%，脯氨酸和过氧化物酶活性较对照分别增加了529.87%和40.6%，丙二醛含量下降了37.04%。上述结果表明，10μmol/L的水杨酸主要通过提高过氧化物酶活性和脯氨酸含量，降低丙二醛含量，从而有效缓解水稻幼苗的低温胁迫伤害。更多还原

【Abstract】 To alleviate the damage of low-temperature stress to rice seedlings, a rice cultivar‘Qingxiangyou19 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%, under10 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.更多还原