蚯蚓粪基质黄瓜、西瓜穴盘苗耐热性研究

为深入了解蚯蚓粪基质对瓜类蔬菜穴盘苗耐热性的影响,以常规草炭系基质为参比,测定了黄瓜、西瓜穴盘苗叶片叶绿素含量、抗氧化酶活性等生理生化指标。结果表明:蚯蚓粪基质穴盘苗与对照穴盘苗在高温胁迫下叶片叶绿素含量均降低,蚯蚓粪基质穴盘苗叶绿素a,b及总量仍显著高于对照(n=3,p<0.05)。蚯蚓粪基质穴盘苗在高温胁迫下叶片SOD,CAT活性增强,与此相反,对照SOD,POD,CAT活性均减弱;高温胁迫下对照穴盘苗叶片电解质渗出率和MDA含量增加幅度较大,分别比蚯蚓粪基质穴盘苗提高了4.47%~102.31%和33.69%~47.75%。说明蚯蚓粪基质黄瓜、西瓜穴盘苗具有较强的耐热性。

Studies on Heat Tolerance of Cucumber and Watermelon Plug Seedling with Vermicompost-based Substrate

Chlorophyll content and antioxidant enzyme activities in leaves of cucumber and watermelon were tested in order to understand the effects of vermicompost-based substrate on heat tolerance of plug seedling.The results showed that high temperature stress decreased chlorophyll content in leaves of plug seedling and chlorophyll content with vermicompost-based substrate was significantly higher than that of control(n=3,p<0.05).Superoxide dismutase(SOD),catalase(CAT) activities in leaves of plug seedling with vermicompost-based substrate increased under high temperature stress,but they decreased in control;The permeation rate of electrolyte and MDA content in control were 4.47%-102.31% and 33.69%-47.75% higher than that with vermicompost-based substrate under high temperature stress.It was suggested that cucumber and watermelon plug seedling with vermicompost-based substrate had stronger heat tolerance.