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作 者 ：孙宪芝¹;郭先锋²;郑成淑¹;王文莉¹;梁芳¹

期 刊 ：应用生态学报 2008年 19卷 09期 页码：1983-1988

关键词：菊花；

摘 要 ：以切花菊品种‘神马’为材料，研究了高温胁迫下外源Ca²⁺对菊花光合系统及活性氧清除酶系统的影响，探讨了Ca²⁺可能的作用机制.结果表明：高温胁迫下外源Ca²⁺抑制了净光合速率(P_n）与实际量子效率（Φ_PSⅡ）的大幅度降低，24 h后，二者分别比对照高出31.11％与21.88％，而初始荧光（F_o）比对照降低了13.19％；Ca²⁺明显激活了高温胁迫下叶片超氧化物歧化酶（SOD）、过氧化物酶（POD）、过氧化氢酶（CAT）的活性，活性氧得到及时清除，24 h后，膜脂过氧化产物丙二醛（MDA）的积累量与相对电导率（REC）分别比对照降低29.20％与35.81％，缓解了短期高温胁迫对菊花光合系统的破坏.

Abstract:

Taking cut flower chrysanthemum ‘Jinba’ as test material, the effects of exogenous Ca²⁺ on its photosynthetic system and antioxidant enzyme activities under high temperature stress were investigated, with the possible action mechanisms of Ca²⁺ discussed. The results showed that under high temperature stress, Ca²⁺ addition greatly inhibited the net photosynthesis rate (P_n) and quantum yield of PSⅡ electron transport (Φ_PSⅡ). After 24 h treatment, the P_n and Φ_PSⅡ were increased by 31.11% and 21.88%, respectively, and the initial fluorescence (F_o) decreased by 13.19%, compare with the control. Ca²⁺ addition also greatly enhanced the activities of SOD, POD and CAT, and thus, the active oxygen was scavenged timely. After 24 h treatment, the MDA accumulation and REC were 29.20% and 35.81% lower than the control, respectively. In conclusion, Ca²⁺ addition could efficiently protect chrysanthemum leaves from the damage in photosynthetic apparatus under shortterm high temperature stress.

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