组培条件下不同番茄品种及砧木自交系幼苗期硝酸盐耐性的比较

采用组培的方法，对15个番茄普通栽培品种的幼苗进行系列浓度Ca(NO₃)₂胁迫处理，10 d后调查不同品种单株幼苗的生长情况和盐害程度。结果表明，15个供试品种幼苗期硝酸盐耐性存在显著差异。上海903、苏红2003、阳光906、大禹中蔬4号、三星L402、番茄大红、中蔬4号、宝大903、霞粉、毛粉 802为硝酸盐敏感品种；早丰番茄、江蔬14号、宝粉和三星906为中等耐硝酸盐品种；日本大粉皇后为耐硝酸盐品种。同时对7个番茄砧木自交系（TR-1、TR-2、TR-3、TR-4、TR-5、TR-7、TR-8）进行了幼苗期高浓度Ca(NO₃)₂的耐盐分析。结果表明，砧木自交系的平均侧根数均显著高于同浓度下供试的普通番茄栽培品种，盐胁迫指数均显著低于普通栽培品种，具有较强的耐盐性；其中TR-8耐盐性最强。

In Virto Comparision of Ca(N03)2 Tolerance of Different Tomato Cultivars and Rootstock Selfed Lines at Seedling Stage

In vitro salt tolerance at seedling stage of tomato cultivars were evaluated under a series of Ca(NO3)2 concentrations. Seedling growth and salinity injury of different cultivars were examined after 10 days of treatment. Results showed that significant differences in salt tolerance were observed among 15 different cultivars. Cultivars of Shanghai 903, Suhong 2003, Sunshine 906, Dayu Zhongshu No. 4, Sanxing L402, Tomato Dahong, Zhongshu No. 4, Baoda 903, Xiafen, Maofen 802 were Ca(NO3)2 sensitive; Zaofeng Tomato, Jiangshu No. 14, Baofen, Sanxing 906 were medium Ca(NO3)2 tolerant; Japanese Dafen Queen was Ca(NO3)2 tolerant. The analysis of salt tolerance of 7 tomato rootstock selfed lines: TR-1, TR-2, TR-3, TR-4, TR-5, TR-7, TR-8 was studied at a high Ca(NO3)2 concentration. It was founded that under the same treatment the average numbers of lateral roots of rootstock selfed lines were significantly higher than those of tomato cultivars, while the salt stress indexes of rootstock selfed lines were significantly lower than those of tomato cultivars. The salt tolerance of rootstock selfed lines was higher than that of tomato cultivars, and salt tolerance of TR-8 was highest among the experimented tomato materials.