外源色氨酸对番茄幼苗生长和生理特性的影响
Effects of Exogenous Tryptophan on Growth and Physiological Characteristics of Tomato Seedlings

为研究外源色氨酸对番茄幼苗生长和生理特性的影响，进行了不同浓度(0、50、100、200、400 mg/L)色氨酸水溶液叶片喷施处理试验。结果表明，200 mg/L的色氨酸处理下番茄幼苗的生物量和壮苗指数高于其它处理。随着色氨酸浓度的提高，叶片的叶绿素和类胡萝卜素含量均呈先升高后降低的趋势，且均在200 mg/L处理时达到最大。色氨酸水溶液处理显著提高了番茄幼苗叶片可溶性糖和可溶性蛋白含量，以200 mg/L色氨酸处理最优。叶片中的抗氧化酶SOD和POD的活性均呈先升高后降低的趋势，在200 mg/L处理时达到最大，MDA含量在50 mg/L处理时最低。综合来看，本研究表明200 mg/L色氨酸叶片喷施处理最有利于提高番茄幼苗的生长和生理活性。
In order to study the effects of exogenous tryptophan on the growth and physiological characteristics of tomato seedlings, different concentrations (0, 50, 100, 200, and 400 mg/L) of tryptophan solution were sprayed on the leaves. The results showed that the biomass and strong seeding indexes of tomato seedlings under 200 mg/L tryptophan treatment were greater than those of other treatments. With the increase of tryptophan concentration, the chlorophyll and carotenoid contents of leaves showed the trend of increasing first and then decreasing, reaching the maximum at 200 mg/L treatment. The tomato seedlings’ soluble sugar and soluble protein contents were significantly increased by exogenous tryptophan treatment, with the 200 mg/L tryptophan treatment having the highest value. The antioxidant enzyme activities of SOD and POD in tomato leaves of all treatments were increased first and then decreased, reaching the maximum at 200 mg/L treatment, and the lowest MDA content occurred in the 50 mg/L treatment. Taken together, our results showed that 200 mg/L exogenous tryptophan treatment exhibited the most benefits in improving tomato seedlings’ growth and physiological activity.