水杨酸预处理对低温胁迫下菊花叶片生理活性的影响.pdf

河南农业科学 1 1 2 1 1* 李永华 , 苏志国, 李洪涛, 田彦彦, 杨秋生 ( 1. , 450002; 2., 450051) : 以秋菊早花品种唐宇金秋和晚花品种祥云为试材, 研究了外施水杨酸( SA) 后不同低温处 下植株叶片脯氨酸含量净光合速率等生 生化指标的变化结果表明: 各温度处 下,SA 处 组的菊花叶片脯氨酸含量净光合速率SO 活性和 CAT 活性均高于喷施蒸馏水的对照组,丙二 醛含量则是对照组较高祥云的各项指标均优于唐宇金秋, 如在- 4 与- 8 下,祥云SA 处 的 脯氨酸含量分别比对照增加了96. 8%和54. 7% ; - 8 时祥云SA 处 的净光合速率为4 的 431%, 唐宇金秋SA 处 的净光合速率为4 时的14.7% 外施 1.0mmol/ L 的SA 能提高叶片 脯氨酸含量和抗氧化酶活性, 保持其光合作用能力,显著提高菊花的低温胁迫抗性 : 菊花; 水杨酸; 低温胁迫; 生 活性 : S682. 1 : A : 2010) Effects of Salicylic Acid Pretreatment on Physiological Activity of Chrysanthemum Leaves under Low T emperature Stress 1 1 2 1 1* LI Yonghua ,SU Zhiguo , LI Hongtao , TIAN Yanyan ,YANG Qiusheng ( 1.College of Forestry,Henan Agricultural University,Zhengzhou 450002, China; 2.Institute of City Landscape Science of Zhengzhou,Zhengzhou 450051,China) Abstract: Autumn chrysanthemum earlyflower cultivar T angyujinqiu and lateflower cultivar Xiangyun were used in this experiment, some physiological and chemical indices such as Pro con tent and Pn of chrysanthemum leaves were studied under low temperature after SA pretreatment. These results showed that Pro content, Pn, SO activity and CAT activity of leaf of two cultivars after SA pretreatment were higher than those of CK, but M A content lower, these index in Xiangyun was prior to those in Tangyujinqiu; for example, Pro content in Xiangyun SA was 968% and 54. 7% higher at - 4 and - 8 than that in Xiangyun CK respectively; Pn in Xiangyun SA at - 8 was 43. 1% of that at 4 , but Pn in Tangyujinqiu SA 14.7% . Exogenous 10mmol/ L SA could make Pro content and antioxidase activity in leaves higher, furtherm