Abstract
Fragrant rosewood (Dalbergia odorifera T.C. Chen) is a highly-valued species suffering from vulnerability due to over-development for wood and medicine. In this study, Fragrant rosewood seedlings were cultured with chitosan oligosaccharide (CO) addition at rates of 0 and 1/800 (v/v) under artificial lightings by 200-W high-pressure sodium (HPS) lamps and 280-W light-emitting diode (LED) panels for a 15 h daily photoperiod and a natural illumination as the control. The LEDs were designed to emit lights in 85% of red (600–700 nm), 15% of green(500–600 nm), and 5% of blue (400–500 nm). The height of artificial lightings was elevated every five to seven days to keep the mean photosynthetic photon flux density (PPFD) of 72–73 µmol m−2 s−1 of artificial lighting at shoot-tips. Seedlings under LED lighting with CO addition had the greatest diameter growth and leaf biomass, as well as the highest nutrient utilization and evaluated quality, while those under HPS lighting had a higher stem sugar concentration but unchanged shoot growth and biomass compared to the control. In conclusion, we recommend Fragrant rosewood seedlings to be cultured with CO addition under LED lighting to efficiently promote synthetic quality and nutrient utilization.
Highlights
Mature urban forest trees can improve air quality, reduce storm water run-off, and sequester carbon [1]
root-collar diameter (RCD) was highest in seedlings receiving chitosan oligosaccharide (CO) addition under the light-emitting diode (LED) lighting, which was greater by 22% and 28% than that under the LED and natural lightings, respectively (Table 2)
Our results showed that seedlings under the LED lighting had a greater height than those under the high-pressure sodium (HPS) and seedlings under both artificial lighting treatments had a greater height than the control
Summary
Mature urban forest trees can improve air quality, reduce storm water run-off, and sequester carbon [1]. Urbanization expansion results in the increases of population, city size, and demand for treed lands. Every year globally millions of public and private funds are invested in city agencies to undertake ambitious projects for urban afforestation [2,3]. In regional urban afforestation efforts, native tree species are generally preferred because they can use available resources most efficiently and are considered more effective than exotic species at supporting the native biodiversity of plants and animals [1]. Some slowly-growing species, are heavily preferred to dominate the urban landscape due to their high commercial values [5,6,7,8,9] and contribution to perceived well-being [10,11]
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