The aim of this study is to evaluate the effects of three types of plant growth regulators (α-naphthyl acetic acid, indole-3-acetic acid and β-indol butyric acid) on the root formation of the semihardwood and hardwood cuttings of Sarcandra glabra (Thunb.) Nakai. | TAP CHI Evaluation SINH HOC of plant 2016, growth 38(3): regulators 359-366 DOI: EVALUATION OF PLANT GROWTH REGULATORS ON ROOT FORMATION OF SEMIHARDWOOD AND HARDWOOD CUTTINGS OF Sarcandra glabra (Thunb.) Nakai Le Hong En*, Nguyen Thanh Nguyen, Giang Thi Thanh Forest Science Institute of Central Highlands and South of Central Vietnam ABSTRACT: The aim of this study is to evaluate the effects of three types of plant growth regulators (α-naphthyl acetic acid, indole-3-acetic acid and β-indol butyric acid) on the root formation of the semihardwood and hardwood cuttings of Sarcandra glabra (Thunb.) Nakai. The effects of plant growth regulators on root formation were evaluated based on living percentage, rooting percentage, secondary rooting percentage, and the number and the length of roots. The results showed that the best root growth regulator was β-IBA. The overall effective concentrations of growth regulators were and . The living percentage of the semihardwood cuttings was lower than that of the hardwood cuttings. However, the root growth parameters of the semihardwood cuttings were better than those of the hardwood cuttings. Keywords: Sarcandra glabra, α-NAA, IAA, β-IBA, cuttings, plant growth regulators, root formation. Citation: Le Hong En, Nguyen Thanh Nguyen, Giang Thi Thanh, 2016. Evaluation of plant growth regulators on root formation of semihardwood and hardwood cuttings of Sarcandra glabra (Thunb.) Nakai. Tap chi Sinh hoc, 38(3): 359-366. DOI: . *Corresponding author: lehongen@. INTRODUCTION Sarcandra glabra (Thunb.) Nakai is an evergreen subshrub that grows to the height of 50 - 150 cm. The branches of Sarcandra glabra are cylindric, erect, and glabrous with swollen nodes. Sarcandra glabra is distributed in various environments such as forest, valleys, ravines, slopes, roadsides, trailsides, grasslands, swamps, streamside, and sandy soil of from near sea level to 2,000 m. .
