野生番茄和栽培番茄的耐盐差异性比较研究

以野生番茄秘鲁番茄,潘那利番茄和栽培番茄“鲜丰98-7”、“交农1号”和“交农2号”为材料,并对其幼苗进行盐胁处理。15 d后对植株的干重、根冠比、叶片含水量和POD酶谱等进行检测与分析。结果表明,野生种的植株干重显著高于栽培种,且保持较高的叶片含水量和根冠比,具有较强的盐适应能力,且潘那利番茄耐盐性强于秘鲁番茄。栽培种的耐盐性低于野生种,且品种间存在差异:“交农1号”和“交农2号”显著优于“鲜丰98-7”。盐胁迫条件下野生番茄和栽培番茄在酶带数量和活性上有极显著的不同,尤其是表现在POD2这条酶带上,其在2个野生种体内活性很强,远远高于栽培番茄。

Comparative Studies on Salt Tolerance of Tomato Wild Species and Cultivar

Two wild tomato species and three cultivars were used and stressed with 1/3-strength and 1/2-strength artificial seawater when their seedlings had 4 true leaves.After salt treatment for 15 days,plant dry weight,root/shoot ratio,leaf water content and POD isozymes were analysed.The results showed that the plant dry weights in wild species were markedly higher than that in the cultivars under salt stress.Wild species had higher leaf water content and root/shoot ratio,and having better adaptability to salinity than the cultivars.Between the two wild species,the salt tolerance in Lycopersicon pennellii LA716 was better than that of Lycopersicon peruvianum LA111.Among the three cultivars,the salt tolerance in "Jiaonong No.1" and "Jiaonong No.2" was significantly greater than "Xianfeng 98-7".The POD isozymes analysis indicated that there were significant difference in the isozymes bands quantity and activity between wild species and cultivars,especially in POD2 band.Its activity was greatly stronger in wild species than that of cultivars.