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为明确土壤中施用噻虫啉对番茄植株生长的影响,分别用36%噻虫啉水分散粒剂有效成分1.0、1.5、2.0、2.5、3.0和5.0 mg/株处理盆栽番茄植株,测定处理后30 d番茄幼苗的生长量、叶片保护酶活性及根系活力。结果表明:1.0~2.5 mg/株噻虫啉处理均可提高番茄幼苗展开叶片数、株高、主根长和鲜重等生理指标,3.0 mg/株处理与对照相比无显著差异,而5.0 mg/株处理则对番茄幼苗生长有显著的抑制作用。不同剂量的噻虫啉处理均可提高番茄幼苗叶片中超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)、苯丙氨酸解氨酶(PAL)和多酚氧化酶(PPO)的活性及根系活力。PPO和SOD活性在2.0 mg/株噻虫啉处理时达到最大值,分别为47.9和14.2 U/(min·g FW),比对照高29.6%和49.5%;POD、CAT和PAL活性在2.5 mg/株剂量时达到最大值,分别为46.0、62.4和26.0 U/(min·g FW),比对照高47.0%、36.7%和35.3%。1.0~5.0 mg/株噻虫啉处理后番茄幼苗根系活力比对照提高2.7%~33.1%。研究表明,土壤施用适量的噻虫啉可显著促进番茄幼苗植株的生长。
In order to clarify the effects of applying thiacloprid on the growth of tomato plants in soil, the potted tomato plants were treated with the effective components of 1.0, 1.5, 2.0, 2.5, 3.0 and 5.0 mg / ml of 36% thiabendazole water dispersible granules, respectively, Growth of tomato seedlings, activities of protective enzymes and root activity of leaves on 30 d. The results showed that: 1.0 ~ 2.5 mg / plant thiacloprid treatment can increase the leaf number, plant height, root length and fresh weight of tomato seedlings and other physiological indicators, 3.0 mg / plant treatment compared with the control no significant difference, while 5.0 mg / Plant treatment of tomato seedling growth was significantly inhibited. Different doses of thiacloprid treatment could increase the activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), phenylalanine ammonia lyase (PAL) Activity and root activity of phenoloxidase (PPO). The activities of PPO and SOD reached the maximum values of 47.9 and 14.2 U / (min · g FW) when treated with 2.0 mg / plant thiacloprid, which were 29.6% and 49.5% higher than that of the control. The activity of POD, CAT and PAL were both 2.5 mg / Strain reached the maximum at 46.0, 62.4 and 26.0 U / (min · g FW), 47.0%, 36.7% and 35.3% higher than the control. The root activity of tomato seedlings increased by 2.7% ~ 33.1% after being treated with 1.0 ~ 5.0 mg / plant thiacloprid. The results showed that application of thiacloprid in soil could significantly promote the growth of tomato seedlings.