喷施赤霉素缓解多效唑对叶用莴苣幼苗的抑制作用

Spraying gibberellin to alleviate the Inhibition of paclobutrazol on leaf lettuce seedlings

    摘要
  • 摘要: 【目的】 研究喷施赤霉素缓解多效唑对叶用莴苣幼苗抑制作用。 【方法】 采用叶用莴苣不同品种与不同质量浓度的赤霉素进行双因素完全随机试验设计,采用5个叶用莴苣品种,赤霉素质量浓度以有效成分计,分别设A1(0 mg/L)、A2(15 mg/L)、A3(30 mg/L)、A4(60 mg/L)、A5(120 mg/L)、A6(240 mg/L)和A7(480 mg/L)共7种喷施水平,于叶用莴苣移栽期测定幼苗素质、叶形及叶片可溶性固形物含量。 【结果】 随赤霉素质量浓度增加,各叶用莴苣品种的株高、根鲜重、根干重、地上部鲜重、地上部干重、总叶面积、总叶长、总叶宽、最大功能叶叶长及最大功能叶叶宽均先增后降,各指标值均在A5处理时达最大,与A1处理相比,A5处理各指标分别增加36.8%~86.6%、30.1%~53.4%、21.1%~77.7%、56.2%~127.3%、56.0%~115.5%、63.4%~142.1%、30.4%~79.5%、27.0%~65.7%、24.0%~50.0%及21.8%~48.8%。可溶性固形物也呈现先增后降的趋势,以A2处理、A3处理表现最佳。叶用莴苣各品种SPAD值及根冠比先降后增,各指标值均为A5处理最低,与A1处理相比,A5处理各指标分别降低17.6%~28.6%及17.5%~36.2%。 【结论】 喷施赤霉素具有缓解多效唑抑制的作用,其中赤霉素质量浓度在A5(120 mg/L)时对叶用莴苣幼苗的调控效果最佳。

     

    Abstract: 【Objective】 In view of the major practical problem that paclobutrazole residue significantly inhibits the growth and development of leaf lettuce at seedling stage, a two-factor completely randomized trial design consisting of different leaf lettuce varieties and gibberellin mass concentrations was adopted to explore whether spraying gibberellin could alleviate the adverse effect of paclobutrazol. 【Methods】 A total of five leaf lettuce varieties and seven spraying levels with different mass concentrations of effective ingredient gibberellin, including A1 (0 mg/L), A2 (15 mg/L), A3 (30 mg/L), A4 (60 mg/L), A5 (120 mg/L), A6 (240 mg/L) and A7 (480 mg/L), were carried out and the seedling quality, leaf type and the content of soluble solids in leaves of leaf lettuce were determined at the transplanting stage. 【Results】 With the increase of gibberellin mass concentration, all parameters of the leaf lettuce height, root fresh weight, root dry weight, shoot fresh weight, shoot dry weight, total leaf area, total leaf length, total leaf width, maximum function leaf length, and maximum function leaf width of five cultivars were increased firstly and then decreased with the increase of gibberellin mass concentration.The values of all indexes reached the maximum at A5 treatment, and compared with A1 treatment, each index of A5 treatment were increased by 36.8%-86.6%, 30.1%-53.4%, 21.1%-77.7%, 56.2%-127.3%, 56.0%-115.5%, 63.4%-142.1%, 30.4%-79.5%, 27.0%-65.7%, 24.0%-50.0%, 21.8%-48.8%, respectively.The indexes of soluble solids also showed a tendency to increase first and then decrease, with the best performance in A2 andA3 treatments.The SPAD value and root shoot ratio of leaf lettuce exhibited an opposite tendency and the minimum of all indexes was found in A5 treatment.Compared with A1 treatment, each index of A5 treatment was significantly reduced by 17.6%-28.6%, 17.5%-36.2%, respectively. 【Conclusion】 In conclusion, the inhibition effect of paclobutrazol residue was alleviated by spraying gibberellin, and the gibberellins mass concentration A5(120 mg/L) exhibited the best regulation effect on leaf lettuce seedlings.

     

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