【作者】 周媛； 董艳芳； 张亚妮； 童俊； 毛静； 徐冬云；

【Author】 ZHOU Yuan;DONG Yan-fang;ZHANG Ya-ni;TONG Jun;MAO Jing;XU Dong-yun;Wuhan Scientific Research Institute of Forestry & Fruit-tree,Hubei Engineering Technology Research Center of Landscape Plant;

【机构】 武汉市林业果树科学研究所,湖北省园林植物工程技术中心；

【摘要】 以‘胭脂蜜’‘鸳鸯锦’‘花蝴蝶’‘紫宸殿’‘锦袍’‘紫鹤’为试材,研究了干旱胁迫对不同品种的杜鹃外观形态、生理指标和叶绿素荧光参数的影响。结果表明,随着干旱胁迫时间的延长,所有杜鹃品种叶片出现不同程度的下垂、萎蔫甚至死亡的现象,其中‘锦袍’的伤害程度相对最轻。MDA含量呈持续上升或先升后降的趋势;蛋白质含量变化较平缓,总体呈下降的趋势,其中‘紫鹤’在干旱第10天时含量达到最高;叶绿素含量呈先下降后上升的趋势;初始荧光(Fo)总体呈现下降再平缓上升的状态,其中花蝴蝶与紫鹤在10d后急剧下降至无,这与外观形态表现一致;最大光化学效率(Fv/Fm)与PSII潜在活性(Fv/Fo)变化规律一致,除两个干旱敏感品种急剧降低以外,其他品种均保持平稳状态。更多还原

【Abstract】 The morphology,physiological characteristics and chlorophyll fluorescence parameters were studied in Rhododendron ’ Yanzhimi’,’ Yuanyangjin’,’ Huahudie’,’ Zichendian’,’ Jinpao’,’ Zihe’ under drought stress.The results showed that the leaves of Rhododendrons became droop,wilting with different degrees and even died,among those,the leaves of ’ Jinpao ’ were hurt most lightly.The content of MDA increased and then decreased.The content of protein of most Rhododendrons appeared a gently decreasing trend but ’ Zihe’ decreased firstly and then increased,reaching the highest point after lOdays.The content of chlorophyll deceased firsdy and then increased.Initial fluorescence(Fo) indicated decreasing trend firstly,and then increasing,however,that of ’Huanhudie’ and ’Zihe’ decreased sharply to zero and which was consisted with their appearance.The value of Fv/Fm(Optimal photochemical efficiency of PSII) and Fv/Fo(Potential activity of PSII) remained at a certain state,except two drought- sensitivity cultivars(’Huanhudie’ and ’Zihe’) decreased sharply.更多还原