| 摘要: |
| 【目的】研究不同程度干旱胁迫对2个菊花品种光合生理特性的影响，为菊花抗旱栽培提供理论依据。【方法】以秋菊早花品种“唐宇金秋”和晚花品种“祥云”为供试材料，利用盆栽试验，以正常浇水为对照(CK，土壤含水率为(40±2)%)，研究不同干旱胁迫强度(中度干旱(T1，土壤含水率为(23±2)%)、重度干旱(T2，土壤含水率为(16±2)%))下2个菊花品种叶片生理指标的变化。【结果】随着干旱胁迫程度的加剧，“祥云”和“唐宇金秋”叶片的相对电导率、丙二醛(MDA)和脯氨酸含量均呈上升趋势，在T2处理下，“祥云”叶片的相对电导率、MDA和脯氨酸含量分别较对照升高23.5%，84.8%和120.4%，而“唐宇金秋”上升幅度均小于“祥云”；“祥云”和“唐宇金秋”叶片SOD、POD及CAT活性均呈上升趋势，其中“唐宇金秋”上升幅度均大于“祥云”。随着干旱胁迫程度的加剧，“唐宇金秋”和“祥云”叶片的叶绿素含量及净光合速率、气孔导度、蒸腾速率均逐渐降低；在相同胁迫条件下，“唐宇金秋”叶片的叶绿素含量及3个光合指标均明显高于“祥云”。【结论】“唐宇金秋”和“祥云”具有不同的干旱胁迫响应机制，“唐宇金秋”具有较强的抗旱能力，在干旱胁迫条件下仍具有较强的光合作用能力。 |
| 关键词: 干旱胁迫 菊花 光合作用 生理指标 |
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| 基金项目:河南省自然科学基金项目(20070220003) |
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| Effect of drought stress on photosynthesis and physiologica characteristics of Chrysanthemum morifolium |
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| Abstract: |
| 【Objective】In order to provide theoretical basis for drought resistance cultivation,the effect of drought stress on the photosynthesis and physiological characteristics of two Chrysanthemum morifolium cultivars was studied in this research.【Method】Taking autumn Chrysanthemum early-flowering cultivar “Tangyujinqiu” and late-flowering cultivar “Xiangyun” as materials,using pot experiment,and contrasting with regular watering(CK,soil water content:（40±2)%),the change of the physiological indices of two cultivar leaves under different drought stresses（Modest drought stess(T1,soil water content:（23±2)%) studied;Serious drought stess(T2,soil water content:（16±2)%） was studied through pot experiments.【Result】With the increase of stress degree,the relative conductivity,MDA content and proline content in leaves of “Xiangyun” and “Tangyujinqiu” increased;under T2 treatment,the relative conductivity,MDA content and proline content of “Xiangyun” leaves rose by 23.5%,84.8% and 120.4% respectively,while those of “Tangyujinqiu” increased less;the activities of SOD,POD and CAT increased,and that in leaves of “Tangyujinqiu” increased more.As the stress degree increased,the Pn,Gs and Tr of “Tangyujinqiu” and “Xiangyun” all decreased;and in the same stress condition,the three photosynthesis indices of “Tangyujinqiu” were obviously higher than those of “Xiangyun”.【Conclusion】“Tangyujinqiu” and “Xiangyun” had different responsive mechanisms to drought stress;“Tangyujinqiu” had stronger drought resistance,and under drought stress its photosynthetic rate was quite high. |
| Key words: drought stress Chrysanthemum morifolium photosynthesis physiological index |
