3种植物生长调节剂对黄花风铃木幼苗生长及生理特性的影响

以黄花风铃木（Tabebuia chrysantha）幼苗为试验材料，采用L₁₆(4⁵)正交试验设计，测定并比较了各个浓度组合处理下黄花风铃木幼苗的生长指标以及生理特性，研究3种植物生长调节剂（GGR、IAA、PP₃₃₃）不同组合对黄花风铃木幼苗的生长和抗性生理交互作用影响，得出提高黄花风铃木幼苗的抗性的最佳浓度组合。结果表明，11号处理（GGR浓度为400 mg·L^-1、IAA浓度为400 mg·L^-1、PP₃₃₃浓度为400 mg·L^-1）根系各生长指标大于其他组合处理，地径增长量8号处理最大，11号处理次之。8号、11号、15号苗高生长量高于其他处理。3种植物生长调节剂中GGR对黄花风铃木幼苗根系生长，地径增长和苗高增长起主导作用，IAA和PP₃₃₃作用不明显。11号处理幼苗的可溶性蛋白、超氧化物歧化酶（SOD）活性均大于其他处理组，丙二醛（MDA）含量最低，而过氧化物酶（POD）活性则是4、11和12号处理明显高于其他处理组合。经分析得出GGR对黄花风铃木幼苗的可溶性蛋白、SOD以及POD起主导作用，IAA和PP₃₃₃作用不明显。PP₃₃₃对黄花风铃木幼苗MDA含量影响显著，IAA和GGR对MDA含量作用不明显。通过对黄花风铃木幼苗各个指标综合分析结果表明，不同生长调节剂的适宜浓度组合为11号处理（GGR浓度为400 mg·L^-1、IAA浓度为400 mg·L^-1、PP₃₃₃浓度为400 mg·L^-1），在此浓度下黄花风铃木幼苗生长情况及抗性生理最佳。本实验揭示GGR、IAA和PP₃₃₃ 3种植物生长调节剂交互作用对黄花风铃木幼苗的影响，为植物生长调节剂在提高园林植物抗逆性，培育抗性品种等方面的运用提供更多的理论支持和依据。

Effects of three plant growth regulators on growth indexes and physiological characteristics of Tabebuia chrysantha seedlings

In order to study the interaction of combinations of three plant growth regulators (GGR, IAA and PP₃₃₃) on the growth and resistance physiological of Tabebuia chrysantha seedlings, and obtain the best concentration combination for improving the resistance of Tabebuia chrysantha seedlings, we chosen Tabebuia chrysantha seedlings as experimental materials, used L₁₆(4⁵) orthogonal experiment design, measured and compared the growth and physiological characteristics of Tabebuia chrysantha seedlings. The results showed that root growth index and growth amount of seedling height with No. 11 treatment (GGR 400 mg·L^-1, IAA 400 mg·L^-1, PP₃₃₃ 400 mg·L^-1) was greater than those with other combination treatments, and which had the largest growth ground diameter with No.8 treatment, followed by No. 11. Among the three plant growth regulators, GGR played a leading role in the root growth index, growth amount of seedling height and diameter of Tabebuia chrysantha seedlings, but IAA and PP₃₃₃ had no significant effect. The soluble protein and superoxide dismutase (SOD) activity in the seedlings with No. 11 treatment were greater than those with other treatment groups, while the content of malondialdehyde (MDA) in the seedlings with No. 11 treatment was the lowest, and the activities of peroxidase (POD) in the seedlings with No. 4, No. 11 and No. 12 treatments were significantly higher than those with other treatments. The results showed that: GGR plays a leading role in the soluble protein, SOD activity and POD activity of the Tabebuia chrysantha seedlings,