干旱地区农业研究Issue(2)：106-112,134,8.DOI:10.16302/j.cnki.1000-7601.2015.02.018
Zn 盐和干旱胁迫对纹党种子萌发和幼苗生理特性的影响
Effects of Zn salt and drought stress on seed germination and seedling physiological characteristics of Codonopsis pilosula in Gansu province
摘要
Abstract
A sand cultivation experiment was conducted to study the effects of Zn2 + with different concentrations (10 - 6 mol・L - 1 ,10 - 5 mol・L - 1 ,10 - 4 mol・L - 1 ,and 10 - 3 mol・L - 1 ) and PEG -6000 (5% 、10% 、15% 、20% 、30% ) on seed germination ,seedling growth ,osmotica accumulation ,and active oxygen metabolism of Codonopsis pilosula ,an authentic Chinese herbal medicine in Gansu province .The results showed that the low concentrations of Zn2 + and PEG could significantly enhance seed germination and seedling growth .With the increase of Zn2 + and PEG concentrations , the germination rate became decreased significantly ,and seedling growth was inhibited .The lowest permeability threshold was - 0 .94 MPa .O2 ・ production rate and H2O2 contents in leaf were increased dramatically .In addition ,activities of superoxide dismutase ,peroxidase ,catalase ,and ascorbate peroxidase went down after an initial increase .Contents of glutathione and ascorbic acid in leaf were decreased markedly .Levels of proline ,soluble sugar and malonaldehyde con-tents in young seedling leaf went up significantly with the increase of Zn2 + and PEG concentrations .It was found that 10 - 6 and 10 - 5 mol・L - 1 zinc salt could improve the drought tolerance capability of Codonopsis pilosula to moderate stress .10 - 3 mol・L - 1 zinc salt and drought stress caused the maximal damages .关键词
Zn2 +/PEG/纹党/透调节物质/活性氧代谢Key words
Zn2 +/PEG/Codonopisis pilosula/osmotica/active oxygen metabolism分类
农业科技引用本文复制引用
叶文斌,樊亮,叶建龙..Zn 盐和干旱胁迫对纹党种子萌发和幼苗生理特性的影响[J].干旱地区农业研究,2015,(2):106-112,134,8.基金项目
甘肃省中青年基金项目（3YSO61－ A25－030）；陇南师范高等专科学校重点项目 （）
