摘要
探讨了重盐分胁迫地段植物展叶期的生理生化特性。2007年4月29日,在天津大港区官港森林公园选定绒毛白蜡和柽柳样株,从早10时到晚8时,每隔2h采集植物的根、枝、叶,按120°划分3个方位采样以做重复。用液氮罐带回实验室,测定组织含水量、水势、可溶性糖含量以及SOD和CAT活性。结果表明,柽柳的叶和根中的含水量显著高于绒毛白蜡,且含水量从叶到枝和从枝到根具有更大的变幅;绒毛白蜡叶水势与叶可溶性糖含量之间呈显著的线性负相关,而柽柳叶水势与叶可溶性糖含量之间呈二次曲线负相关的变化趋势但不显著;柽柳叶中SOD活性和CAT活性之间呈正相关,而绒毛白蜡展叶中SOD活性和CAT活性之间则呈负相关。这些结果表明,重盐分胁迫地段,柽柳以其较强的稀盐能力、渗透调节能力以及代谢能力使得其耐盐能力优于绒毛白蜡。
We studied physiological and bio-chemieal properties during the leaf expansion period under heavy salt stress. On the April 29th, 2007, the root, shoot and leaf samples of Fraxinus velutina and Tamarix chinensis were collected at two hours intervals from ten o＇clock am. to eight o＇clock pro. according to 120-degree orientation around the standard plants in the Guanggang Forest Park of Dagang district, Tianjin, respectively. Then, the samples were put into liquid nitrogen jug and brought to the laboratory. The tissue water content, water poten- tial and, soluble sugar, as well as SOD and CAT activity of those samples were determined, respectively. Our findings suggested that, the tissue water contents of T. chinensis in leaves and roots were higher than those of F. velutina, and the change amplitudes of the water con- tents of T. chinensis from leaf to shoot and from shoot to root were greater than those of F. ve- lutina. There existed a significant negative linear relationship between the water potential and the soluble sugar content in leaves of F. velutina, while there had a negative quadratic curve relationship between them in leaves of T. chinensis, but there was no significance. There was a positive correlation between SOD and CAT activities in leaves of T. chinensis, while a negative correlation between them in leaves of F. velutina. Thus, salt-resistance of T. chinensis,with abilities on salt-dilution, osmoregulation and metabolism, is stronger than that of F. velutina.
出处
《南开大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第4期18-23,共6页
Acta Scientiarum Naturalium Universitatis Nankaiensis
基金
天津市应用基础研究计划项目(06YFJMJC11500)
关键词
绒毛白蜡
柽柳
组织含水量
渗透调节
保护酶
Fraxinus velutina
Tamariz chinensis
tissue water content
osmoregulation
protective enzyme
