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Vu Phong Lam,Ricardo Hernandez,Jeongyeo Lee,Sung Jin Kim,Jongseok Park 한국원예학회 2022 원예과학기술지 Vol.40 No.1
In the hemp-seedling industry, the number of leaves on the harvested cuttings from mother plants is crucial for survival. Therefore, the present study determined the suitable number of leaves on hemp (Cannabis sativa L.) cuttings to promote adventitious root (AR) formation. Hemp cuttings with two, three, and four leaves were harvested from the apex of the mother plant. After disinfecting their base, 18 cuttings per replication were transplanted into a plug tray (72 holes) filled with a horticultural substrate. The photosynthetic characteristics of the cuttings and well-rooted hemp plants were measured at 22 and 60 days after transplantation (DAT), respectively. At 22 DAT, the average AR length, AR fresh weight, AR generation rate, and average number of ARs were the highest from two-leaf cuttings. Due to the higher AR generation, the net photosynthetic rate was the highest in cuttings with two-leaf cuttings at all the light intensity conditions (0, 50, 100, 175, 250, 500, 750, 1,000, and 1,500 μmol·m<SUP>-2</SUP>·s<SUP>-1</SUP>). The initial AR development of cuttings with two leaves likely enabled sufficient water uptake and photosynthesis to increase the survival rate. Growers may increase the productivity per unit area of well-rooted hemp plants by harvesting cuttings with two leaves.
Root pruning increased bioactive compounds of hydroponically-grown Agastache rugosa in a greenhouse
Vu Phong Lam,김성진,Hyun Joo Lee,Jong-SeokPARK 한국원예학회 2019 Horticulture, Environment, and Biotechnology Vol.60 No.5
The aim of this study was to determine the proper root pruning time and ratio for enhancing bioactive compound formationin Agastache rugosa without plant growth inhibition. The control (without root pruning) and fi ve treatments (1, 3, 5, 7, and9 days of root pruning before harvesting (RPBH)) with 50% root pruning (Experiment 1) and four treatments of root pruningratios with 30, 50, 70, and 90% root length at 5 days RBPH (Experiment 2) were performed in a hydroponic culture system. The results showed that shoot fresh and dry weights did not diff er signifi cantly between the 1, 3, 7, and 9 days RPBH andthe control. There were no signifi cant diff erences in shoot fresh and dry weights between 30 and 50% root pruning ratios andthe control. The soil–plant analysis development (SPAD) chlorophyll meter was signifi cantly decreased under ratios of 70and 90% and 1 and 3 days RPBH, compared to other treatments. The rosmarinic acid (RA) and tilianin concentrations of A. rugosa under 9 days RPBH with 50% root pruning were signifi cantly (105% and 141%) higher than those of the control. Theacacetin concentration under 7 days RPBH with 50% root pruning was signifi cantly (316%) higher than that of the control,while the RA and acacetin concentrations under 30% root pruning at 5 days were signifi cantly (108% and 251%) higher thanthat of the control. These results indicated that 50% root pruning at 7 or 9 days before harvesting increased the concentrationsof acacetin, RA, and tilianin and 30% root pruning at 5 days before harvesting increased in the levels of acacetin andRA concentration in A. rugosa without plant growth inhibition.
Vu Phong Lam,Jaeyun Choi,Sung Jin Kim,Jong-SeokPARK,Ricardo Hernandez 한국원예학회 2019 원예과학기술지 Vol.37 No.6
The objective of the present study was to evaluate the effects of plant spacing (14-, 20-, and 31-cm) on the lateral branch length, shoot fresh and dry weights, yield, and glucosinolate content of watercress at 35 and 56 days after transplanting (DAT) in a hydroponic culture system. Two-week-old seedlings were transplanted into three deep flow technique systems in a greenhouse with three plant spacing treatments: 31-cm (36 plants per bed), 20-cm (72 plants per bed), and 14-cm (144 plants per bed). Each treatment had three beds and the size of each bed was 3.24 m2. The lateral branch length, shoot fresh and dry weights, and yield were measured, and glucosinolate concentration in leaves and stems of watercress was analyzed at 35 and 56 DAT. Both lateral branch length and yield per unit area were significantly reduced by increasing plant spacing, whereas the shoot fresh and dry weights were significantly increased. The total concentration of glucosinolate in the shoots was higher at 56 DAT than at 35 DAT. Furthermore, at 35 DAT, the glucosinolate concentration was the highest in the leaves and stems of plants grown under 14-cm and 31-cm spacing, respectively, than under other spacing treatments. However, at 56 DAT, the total glucosinolate concentration was higher in the leaves and stems of plants grown under 20- and 31-cm spacing and under 14- and 20-cm spacing, respectively. The highest total glucosinolate content per shoot in a unit area was observed under 14-cm spacing at 35 DAT (6.58 mmol/shoot DW/m2) and under 20-cm spacing at 56 DAT (51.99 mmol/shoot DW/m2). These results suggest that watercress yield could be optimized by growing plants under 14-cm spacing and harvesting at 35 DAT, whereas growing plants under 20-cm spacing and harvesting at 56 DAT would be an optimal method for increasing glucosinolate content without negatively affecting the growth of plants grown under a hydroponic culture system in a greenhouse.