Abstract: Taking Morus alba cv. Tortuosa, Morus australis Poir. var. Australis, Morus mongolica Schneid. as experimental material, this paper explored the effects of the three different concentrations (0, 100, 200, 300, 400 mmol·L-1) on malondialdehyde (MDA), chlorophyll, soluble sugar (SS), peroxidase (POD), superoxide dismutase (SOD).The content of MDA in three mulberry plants increased with the increase salt concentration. And MDA content in Morus mongolica Schneid. was higher than that in other two mulberry varieties.The content of chlorophyll gradually decreased with the increase of salt concentration, and Morus alba cv. Tortuosa, Morus australis Poir. var. Australis, Morus mongolica  Schneid. reached the minimum values of 6.75, 12.61 and 8.93 mg·g-1 at 400 mmol·L-1 salt concentration. Activity of SOD, POD and the content of SS increased first and then decreased with the increasing salt concentration.  The theoretical basis was provided for the evaluation of salt tolerance of different mulberry varieties planted in saline areas of Western China by the determination of each index.

Key words: Morus alba cv. Tortuosa, Morus australis Poir. var. Australis, Morus mongolica Schneid., salt stress, physiological index

摘要： 以龙桑（Morus alba cv. Tortuosa）、鸡桑（Morus australis Poir. var. Australis）、蒙桑（Morus mongolica Schneid.）为研究对象，探究了不同浓度盐胁迫（0、100、200、300、400 mmol·L-1）对3种桑的丙二醛(malondialdehyde，MDA)、叶绿素、可溶性糖（soluble sugar，SS)、过氧化物酶（peroxidase，POD）、超氧化物歧化酶（superoxide，SOD）等生理指标的影响。结果表明：在盐胁迫过程中，3种桑科植物中MDA含量随盐浓度的升高而增加,蒙桑MDA含量均高于其他桑品种；叶绿素含量随盐浓度的升高逐渐下降，在盐浓度为400 mmol·L-1时，龙桑、鸡桑、蒙桑叶绿素含量达到最小值，分别为6.75、12.61、8.93 mg·g-1；随着盐浓度的升高，SOD活性、POD活性、SS含量均呈现先增加后降低的趋势。研究结果可为西部盐渍化地区栽植不同桑品种的耐盐性能评价提供理论依据。

关键词: 龙桑, 鸡桑, 蒙桑, 盐胁迫, 生理指标