设施栽培西瓜品种对盐胁迫的响应

采用营养液栽培，对16个设施栽培小型西瓜（Citrullus lanatus M．）品种在盐胁迫下的生长与生理响应进行了研究。结果表明：盐胁迫使供试所有西瓜品种幼苗的株高、茎粗、叶片数、最大叶长、最大叶宽、植株鲜质量和干质量均不同程度降低；所有品种的叶片质膜相对透性、丙二醛、脯氨酸和叶绿素含量明显增加，而根长和根系活力不同品种表现不同。相关性分析表明，除根长相对值外，各生长指标相对值均与干质量相对值呈显著正相关；所测生理指标中除叶绿素含量相对值外，也均与干质量相对值呈显著相关性。以干质量相对值和与其呈显著相关性的各生长和生理指标的相对值为变量，进行系统聚类分析，可将供试西瓜品种分为3类，其中早春黄冠、秀雅、夏星、爱丽四号这4个为耐盐性较强的品种，正品春红玉、正品小兰、世纪春秋、苏蜜一号、秋红莲、早春红玉、琼丽这7个为耐盐性中等的品种，世纪黑美人、春兰、秀丽、春红玉、中江黑美人这5个为耐盐性较弱的品种。

Response of Watermelon Cultivars to Salinity Stress in Protected Culture

The experiment was conducted to study the growth and physiological response of 16 mini-watermelon(Citrullus lanatus M.) cultivars to salinity stress in solution culture.The results showed that plant height,stem diameter,number of leaves,length and width of max leaf,fresh mass and dry mass of all tested watermelon cultivars were decreased to different extent under salinity stress,while membrane permeability,MDA,proline and chlorophyll contents of all tested cultivars were increased obviously,and root length ...