| 3个地理种群蒙古沙拐枣同化枝解剖结构及抗旱性比较 |
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| 引用本文： | 赵小仙,李毅,苏世平,白潇.3个地理种群蒙古沙拐枣同化枝解剖结构及抗旱性比较[J].中国沙漠,2014,34(5):1293-1300. |
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| 作者姓名： | 赵小仙 李毅 苏世平 白潇 |
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| 作者单位： | 甘肃农业大学林学院, 甘肃 兰州 730070 |
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| 基金项目： | 国家国际科技合作专项(2012DFR30830);甘肃省财政厅甘肃省高等学校基本科研业务费资助 |
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| 摘 要： | 按自然降水梯度沿河西走廊从东到西选择3个地理种群蒙古沙拐枣为研究对象，采用常规石蜡切片方法和光学显微镜观察的方法对同化枝解剖结构进行比较分析。测定了同化枝直径、细胞角质化外壁厚等15个抗旱性结构指标，并进行方差分析和相关性分析以及主成分分析，采用隶属函数对不同种群抗旱性进行综合评价。结果表明：研究的同化枝都具有典型的旱生结构，这是植物长期适应干旱环境的结果；其中14个指标在各种群间的差异极显著；筛选出了4项具有代表性的旱性结构指标——细胞角质化外壁厚、气室径向长、皮下纤维簇数/直径以及小维管束个数/直径。对蒙古沙拐枣抗旱性进行综合评价得出，3个地理种群随着水分条件的降低其抗旱性增强，抗旱性大小顺序为酒泉>张掖>武威。
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| 关 键 词： | 沙拐枣 同化枝 解剖结构 抗旱性 |
| 收稿时间： | 2013-07-04; |
| 修稿时间： | 2013-08-18 |
Drought Resistance Analysis Based on Anatomical Structures of Assimilating Shoots of Calligonum mongolicum from Three Geographic Populations |
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| Zhao Xiaoxian,Li Yi,Su Shiping,Bai Xiao.Drought Resistance Analysis Based on Anatomical Structures of Assimilating Shoots of Calligonum mongolicum from Three Geographic Populations[J].Journal of Desert Research,2014,34(5):1293-1300. |
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| Authors: | Zhao Xiaoxian Li Yi Su Shiping Bai Xiao |
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| Institution: | College of Forestry, Gansu Agricultural University, Lanzhou 730070, China |
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| Abstract: | The anatomical structures of assimilating shoots of Calligonum mongolicum from three geographic populations of different habitats under precipitation gradient from east to west along the Hexi Corridor, were observed and measured under optical microscope with the paraffin-section method. The 15 drought resistance indexes such as the diameter of assimilating shoots and the thickness of cuticles were measured, the variance, correlation and principal component analysis were used in the analysis of the indexes, the drought resistances of different populations were evaluated by membership function. The results showed that assimilating shoots of the populations tested had the typical xeromorphic structure. this was the result of long term adaptibility to the arid environment of plateau. 14 indexes had significant difference in the populations (p<0.01), and 4 typical xeromorphic indexes which were thickness of cuticles, thickness of air chamber, the ratio of fibre cluster numbers under epidermal cell to diameter of assimilating shoots and the ratio of the number of small vascular bundle to diameter of assimilating shoots were selected by principal component analysis. According to the comprehensive evaluation of drought resistance of C. mongolicum, drought resistance was enhanced with the loss of the moisture condition with the order of Jiuquan > Zhangye > Wuwei. |
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| Keywords: | Calligonum mongolicum" target="_blank">Calligonum mongolicum')" href="#">Calligonum mongolicum assimilating shoots anatomical structure drought resistance |
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