Shortening the Vegetative Growth Stage of Phalaenopsis Queen Beer ‘Mantefon’ by Controlling Light with Calcium Ammonium Nitrate Levels under Enriched CO2
2022
Ah Ram Cho | Sun Woo Chung | Yoon Jin Kim
The vegetative growth, photosynthetic, and stomatal characteristics were investigated in Phalaenopsis Queen Beer &lsquo:Mantefon&rsquo: to determine light&rsquo:s influence with calcium ammonium nitrate (CAN) levels under 800 &mu:mol·:mol&minus:1 CO2. Two lights (150 ±: 20 and 300 ±: 20 &mu:mol·:m&minus:2·:s&minus:1) and CAN levels were employed for 40 weeks: calcium, ammonium, and nitrate levels by 0.90, 0.55, and 2.97 mmol·:L&minus:1 (CAN1), 8.63, 1.11, and 6.05 mmol·:L&minus:1 (CAN2), 12.80, 1.72, and 9.13 mmol·:L&minus:1 (CAN3), and 18.80, 2.27, and 12.20 mmol·:L&minus:1 (CAN4), respectively. The number of leaves increased in the plants grown at 300 ±: 20 &mu:mol·:m&minus:2·:s&minus:1 with CAN1 compared to control. Plants grown at 300 ±: 20 &mu:mol·:m&minus:2·:s&minus:1 with CAN4 had the lowest number of leaves among all plants. The time to the mature leaf span decreased in the plants grown at 300 ±: 20 &mu:mol·:m&minus:2·:s&minus:1 with CAN1. The net CO2 uptake was higher in the plants grown at 300 ±: 20 &mu:mol·:m&minus:2·:s&minus:1 than those grown at 150 ±: 20 &mu:mol·:m&minus:2·:s&minus:1 with CAN1&ndash:3 conditions. The water-use efficiency is higher in the plants grown with CAN1 than those with CAN2&ndash:4 at 300 ±: 20 &mu:mol·:m&minus:2·:s&minus:1. The maximum stomatal aperture was the largest in the plants grown at 300 ±: 20 &mu:mol·:m&minus:2·:s&minus:1 with CAN1&ndash:2 among all plants. Consequently, light levels of 300 ±: 20 &mu:mol·:m&minus:2·:s&minus:1 in Phalaenopsis Queen Beer &lsquo:Mantefon&rsquo: must be accompanied by nutrient CAN1 to improve photosynthesis and stomatal activity and promote leaf growth under 800 &mu:mol·:mol&minus:1 CO2 conditions.
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