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以“京欣四号”西瓜为试材,在温室栽培条件下,设置不同浓度的邻苯二甲酸二丁酯进行处理,探讨其对西瓜苗光合作用及枯萎病的影响。结果表明:浓度为1.0mL·L~(-1)的邻苯二甲酸二丁酯在促进西瓜植株生长,提高净光合速率(Pn)、蒸腾速率(Tr),增加胞间二氧化碳浓度(Ci)和气孔导度(Gs)的同时,能够有效降低西瓜枯萎病的发病率和病情指数,防效达到37.5%;当邻苯二甲酸二丁酯浓度为2.0mL·L~(-1)时,其对西瓜植株的生长和净光合速率(Pn)、蒸腾速率(Tr)、胞间二氧化碳浓度(Ci)和气孔导度(Gs)呈抑制作用,且对西瓜枯萎病的抑制作用减弱,防效仅为9.4%。因此,在生产中,合理利用邻苯二甲酸二丁酯会对预防、抑制西瓜枯萎病的发生产生积极的作用。
Using “Jingxin No.4” watermelon as test material, different concentrations of dibutyl phthalate were set up under greenhouse cultivation conditions to investigate their effects on photosynthesis and blight of watermelon seedlings. The results showed that the concentration of 1.0 mL·L -1 of dibutyl phthalate could promote the growth of watermelon plant, increase the net photosynthetic rate (Pn), transpiration rate (Tr) and increase the intercellular carbon dioxide concentration (Ci) And stomatal conductance (Gs), the morbidity and disease index of watermelon fusarium wilt could be effectively reduced, and the control effect reached 37.5%. When the concentration of dibutyl phthalate was 2.0mL·L -1, It inhibited the growth and net photosynthetic rate (Pn), transpiration rate (Tr), intercellular carbon dioxide concentration (Ci) and stomatal conductance (Gs) of watermelon plants, but also inhibited the inhibition of watermelon blight, Only 9.4%. Therefore, in the production, rational use of dibutyl phthalate will have a positive effect on the prevention and suppression of watermelon blight.