人工盆栽条件下，研究不同剂量羧甲基壳聚糖和水杨酸混配液对化两优3号、桂农占和天优998移栽返青期幼苗在10℃低温下处理4d后的叶赤枯度和生理指标的变化。结果表明，喷施不同剂量羧甲基壳聚糖和水杨酸混配液后，移栽返青期水稻幼苗叶赤枯度下降，伤害度、丙二醛（MDA）的含量大幅下降，脯氨酸浓度下降幅度较小，超氧化物歧化酶（SOD）活性上升，而过氧化物酶（POD）活性下降；在100 mg羧甲基壳聚糖+100 mg/L蒸馏水和150 mg羧甲基壳聚糖+150 mg水杨酸/L蒸馏水的处理对提高水稻幼苗抗低温能力较好；在3个品种（组合）中，天优998喷施羧甲基壳聚糖和水杨酸混配液后抗低温能力提高最明显。%The effect and some physiological index were investigated in 3 rice varieties (combination), Hualiangyou 3, Guinongzhan and Tianyou 998, treated with mixed carboxymethyl chitosan and salicylic acid(MCCSA) with 5 dose levels, which then were subject-ed to 10℃ low temperature for 4 days in climatic chamber. The results showed that leaf’s discoloration degree, damage degree and MDA content of seedlings declined sharply reduced after sprayed different doses of MCCSA, meanwhile the concentration of proline declined slightly, however, the activity of SOD increased, but activity of POD decreased. The doses of MCCSA in T2 and T3 could in-creas resistance significantly of rice seedling to low temperature, Tianyou 998 showed strongest resistance to cold in 3 rice varieties af-ter sprayed with MCCSA.
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