浙江农林大学学报2017，Vol.34Issue(4)：597-607,11.DOI:10.11833/j.issn.2095-0756.2017.04.005
4个杜鹃花品种对干旱胁迫的生理响应及抗旱性评价
Physiological response to drought stress and drought resistance evaluation of four Rhododendron cultivars
摘要
Abstract
Rhododendron has poor drought resistance, which limits its use in gardens of arid areas in North China. Therefore, study on the drought resistance of Rhododendron could provide a theoretical basis for its ap-plication in northern arid gardens. Four Rhododendron cultivars: 'Lan Yin' , 'Guoqihong' , 'Aiding-bao' , and 'Fenzhenzhu' , were selected as test material, each cultivar contains 6 plants, and leaf anatomic structural characteristics and physiological responses to different degrees of drought stress were studied (2 fac-tors 3 level complete randomized trial). A membership function was also used to rank drought resistance. Re-sults illustrated that total water content of the leaf and the content of soluble sugar increased significantly as drought stress increased (P<0.05), but the content of chlorophyll, carotenoids, and the content of soluble pro-teins decreased significantly (P<0.05). In addition, cell membrane permeability significantly rose (P<0.05);whereas, superoxide dismutase (SOD) and peroxidase (POD) activities went up first then down. Furthermore, the H2O2 content of 'Lan Yin', and 'Aidingbao' declined as drought stress increased, but H2O2 content of'Guoqihong' and 'Fenzhenzhu' decreased significantly (P<0.05) first and then increased significantly (P<0.05). Above all, the order of drought resistance was: 'Lan Yin' < 'Guoqihong' < 'Fenzhenzhu' <'Aidingbao'. Key indicators and relativities in evaluating drought resistance of these Rhododendron cultivars were thickness of palisade tissue, 0.850; thickness rate of palisade, 0.733; sponge tissue, 0.711; proline con-tents, 0.893;leaf relative water content, 0.703;and the content of H2O2, 0.699. [Ch, 2 fig. 7 tab. 36 ref.]关键词
植物学/杜鹃花/干旱胁迫/抗旱性Key words
botany/Rhododendron cultivars/drought stress/drought resistance分类
农业科技引用本文复制引用
高晓宁,赵冰,刘旭梅,黄文梅..4个杜鹃花品种对干旱胁迫的生理响应及抗旱性评价[J].浙江农林大学学报,2017,34(4):597-607,11.基金项目
西北农林科技大学基本科研业务费资助项目(Z109021703) （Z109021703）
