几种多浆植物耐旱性的初步比较.doc

目 录 摘 要 II 关键词 II Abstract III Key words III 1 前言 1 1.1 耐旱性植物品种筛选的意义 1 1.2 植物耐旱性的研究进展 1 1.2.1 植物适应干旱的机理 1 1.2.2 植物耐旱性鉴定指标 5 1.2.5 植物耐旱性研究中存在的问题 5 1.5 多浆植物耐旱性研究的目的和意义 4 2 试验材料与方法 4 2.1 试验材料 4 2.2 试验设计和方法 4 2.2.1 反复干旱胁迫处理 5 2.2.2 一次干旱胁迫处理 5 2.2.5 耐旱性生理指标测定 5 2.5 测定内容和方法 5 5 结果分析 6 5.1 反复干旱的状态分析 6 5.2 1次干旱处理过程中暂时萎蔫率的结果分析 7 5.5 耐旱性生理指标测定的结果分析 8 5.5.1 叶片持水力的结果分析 8 5.5.2 离体叶片相对含水量的结果分析 8 5.5.5 离体失水速率（RWL）的结果分析 9 5.5.4 气孔密度测定的结果分析 10 5.5.5 离体叶片相对电导率测定 11 4 小结与讨论 11 4.1 6种多浆植物材料的抗旱性综合分析 11 4.2 讨论 12 参考文献 15 致 谢 15 几种多浆植物耐旱性的初步比较 摘 要 随着节水型园林的建设与发展，耐旱性植物的筛选受到广泛关注。通过人工干旱胁迫处理八宝景天、凹叶景天、佛甲草、露草等6种多浆植物，观察植株形态，并对叶片持水力、离体叶片相对含水量（RWC）和离体叶片失水速率（RWL）等生理指标进行测定，结果分析表明：①八宝景天和露草在干旱胁迫条件下比其他供试材料具有更好的生长表现，并且与其他供试材料差异显著,在节水型园林中可以考虑应用这两种材料。②佛甲草和细叶佛甲草在干旱胁迫下的生长表现较好，它们在电导率方面与凹叶景天和垂盆草有显著性差异，③凹叶景天和垂盆草在干旱胁迫下的生长表现较差，在节水型园林中不要大规模使用。多浆植物的抗旱性的初步研究为节水型园林中耐旱性植物材料的筛选提供依据从而为节水型园林的发展作出一定的贡献。 关键词 多浆植物；相对含水量；离体叶片失水速率；气孔；干旱胁迫  Abstract With the constructing and developing of water-saving gardens, the selection of drought-tolerant plants takes more and more attention. The drought stress were studied on six sedums such as Sedum spectabile, Sedum emarginatum, Sedum linears, Atenia cordifolia etc by manual drought stress. The plant form was observed and the physiological indexes including the capacity of water holding of excised-leaf, the leaf relative water content, rate of water loss of excised-leaf were determined. The results indicated that ①Sedum spectabile and Atenia cordifolia had a better growth performance than other experimental cultivars with the extension of stress and they had significance difference from others. So in the water-saving gardens, the two plants should be considering. ②The performance of Sedum linears and Sedum spp. were similar, they had significance difference from Sedum emarginatum and Sedum sarmentosum in electric conductivity of excised-leaf. ③Sedum emarginatum and Sedum sarmentosum had worse growth performance. There is no significance difference between Sedum emarginatum and Sedum