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Effects of the plant growth regulator NAA on young fruit drop prevention and seed quality of Ngoc Linh ginseng (Panax vietnamensis Ha et Grushv.)

100%

Quang T. C., Cuong N. C., Thien N. P., Truong N. X., Lien T. T.

World News of Natural Sciences

2026

vol. 64

303-315

Ngoc Linh ginseng (Panax vietnamensis Ha et Grushv.) is a rare and highly valuable medicinal plant endemic to Vietnam, whose large-scale cultivation is constrained by low fruit set, early fruit drop and limited seedling quality. This study evaluated the effects of different concentrations of the plant growth regulator Naphthalene Acetic Acid (NAA) on flower and fruit development, seed quality, seed germination and seedling growth of Ngoc Linh ginseng under nursery conditions. The experiment was conducted from March 2022 to March 2024 at Ngoc Linh Mountain, Quang Nam Province, using four treatments: water spray (control) and foliar application of NAA at 20, 30 and 40 ppm, arranged in a randomized complete block design. The results showed that NAA application significantly influenced reproductive and seedling-related parameters compared with the untreated control. NAA at 30 ppm produced the most favorable outcomes, increasing the number of flowers per inflorescence (61.63 flowers), flower stalk length (1.43 cm), flower diameter (3.59 mm), and the number of fruits per cluster (44.08 fruits). Fruit quality was also improved, with the highest proportion of red fruits (>46%) and the lowest proportion of green fruits. In addition, seed treatment with NAA at 30 ppm resulted in the highest germination rate (78.89%), seedling formation rate (75.56%) and proportion of marketable seedlings (74.11%). Seedlings from this treatment exhibited superior growth performance, including greater plant height, canopy diameter, and the highest weight of 100 tubers (132.65 g). Overall, foliar application of NAA at a concentration of 30 ppm is recommended to enhance flower and fruit set, improve seed quality and promote seedling growth of Ngoc Linh ginseng, thereby contributing to the development of a standardized and sustainable seedling production system.

Research on the effects of planting season, density and spacing on the growth, development and yield components of honeysuckle (Lonicera japonica Thunb.)

86%

Dinh D. X., Phong P. X., Son N. H., Truong N. X., Giang D. T., Lien T. T.

World News of Natural Sciences

2026

vol. 64

232-245

Honeysuckle (Lonicera japonica Thunb.) has traditionally been used in medicine to treat mastitis, boils, itching, and allergic conditions. This study was conducted in Gia Lai to determine the appropriate planting season, density, and spacing to optimize the growth, development, yield, and quality of honeysuckle. May was identified as the optimal planting season, suitable for achieving high yield, vigorous growth, and good medicinal quality. The most suitable planting spacing for honeysuckle is 0.8 m × 0.8 m, corresponding to a density of 15,600 plants per hectare. The average yield of dried honeysuckle flowers ranges from 0.7 to 0.8 tons per hectare, while the yield of honeysuckle stems reaches 7.5 tons or more. The active compound content meets the standards specified in the Vietnamese Pharmacopoeia V (2017).

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2 World News of Natural Sciences

2 2026

2 Lien T. T.

2 Truong N. X.

1 Cuong N. C.

1 Dinh D. X.

1 Giang D. T.

1 Phong P. X.

1 Quang T. C.

1 Son N. H.

1 Thien N. P.

Search results

Effects of the plant growth regulator NAA on young fruit drop prevention and seed quality of Ngoc Linh ginseng (Panax vietnamensis Ha et Grushv.)

Research on the effects of planting season, density and spacing on the growth, development and yield components of honeysuckle (Lonicera japonica Thunb.)