摘要
通过使用不同浓度梯度PEG6000(0、2.5%、5%、10%、15%、20%)对喀斯特适生植物鳞叶藓Taxiphyllum taxiramenum(Titt.)Fleisch进行水分胁迫处理,测定其不同胁迫强度和进程植物体内的含水量、游离脯氨酸和叶绿素等生长生理指标。结果为2天时植物体内含水量和叶绿素在相对低水分胁迫(PEG<10%)条件下随着胁迫强度的增强呈递减趋势,相对高强度水分胁迫(PEG>10%)条件下胁迫越强烈其抗胁迫的保水能力和生命活性越强;且胁迫时间的延长,植物体内含水量、叶绿素均减少,10%PEG水分胁迫条件下游离脯氨酸开始积累。研究结果表明鳞叶藓具有独特和较强的抗水分胁迫能力。另外,增加外源Ca+2能够增强鳞叶藓抗水分干旱胁迫能力。
Taxiphyllum taxiramenum （Titt.） Fleisch, a species of karst adaptive moss, was treated with different concentration gradient of PEG600 （0, 2. 5%, 5%, 10%, 15%, 20%） for the study of its response to water stress, with the changes of the water content, free proline and chlorophyll etc. were tested and analyzed. The result showed that two days after treatment, the water content and the chlorophyll content were decreasing in the lower range of water stress. （ PEG600 〈10%） as the PEG600 increased, and were increasing in the higher range of water stress （PEG600 〉10%） as the PEG600 increased. When PEG600 %10%, the free praline began to increase. In addition, Ca^＋2 help to accumulate the content of free praline and then improve the resistance of the plants to the drought stress.
出处
《贵州林业科技》
2006年第3期29-32,共4页
Guizhou Forestry Science and Technology
基金
国家自然科学基金"喀斯特适生植物环境适应性研究"资助
关键词
水分胁迫
生理适应性
鳞叶藓
Taxiphyllum taxiramenum （Titt.） Fleiseh
Water stress
Physiological adaptability
