Effects of Different Plant Growth Regulators on the Rooting and Growth of Spatholobus Suberectus Cuttings
Spatholobus suberectus,a traditional Chinese medicinal herb,faces a severe decline in wild resources,leading to an urgent need for effiicient artificial propagation.This study investigated the effects of different con-centrations of plant growth regulators-NAA,IBA,and Indine Naphthalene Acetic Acid-on the rooting and growth characteristics of Spatholobus suberectus cuttings.The aim was to determine the optimal concentration of these growth regulators for the propagation of Spatholobus suberectus to provide a scientific basis for its efficient artifi-cial cultivation.The results showed that cuttings treated with 100 mg/L IBA had the highest rooting rate of 95.56％,significantly higher than the control by 13.34％(P＜0.05).The treatment with 1 mL/L Indine Naphtha-lene Acetic Acid resulted in the highest number of roots per plant(18.67),root length(158.38 cm),root volume(1.52 cm3),and rooting effect index(98.55),all significantly better than the control and other treatments(P＜0.05).The treatments with 50 mg/L NAA,2 mL/L Indine Naphthalene Acetic Acid,150 mg/L NAA,and 50 mg/L IB A showed the best results in SPAD value,new shoot length,new shoot diameter,and new shoot biomass.Based on the principal component comprehensive evaluation,the overall best performance was achieved with 150 mg/L NAA,indicating that this concentration provides the most favorable conditions for the rooting and growth of Spatholobus suberectus cuttings.
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