Experimental design
Ex vitro P. delenatii stem node elongation under different light conditions
The shoots with 1.5–2.0 cm length derived from ex vitro plants grown in the greenhouse were transferred into light chambers with different conditions including 100 % blue LED (100B, at a wavelength of 450 nm), 100 % red LED (100R, at a wavelength of 660 nm), 90 % red LED ? 10 % blue LED (90R:10B, 90 % red light at a wavelength of 660 nm and 10 % blue light at a wavelength of 450 nm), 50 % red LED ? 50 % blue LED (50R:50B, 50 % red light at a wavelength of 660 nm and 50 % blue light at a wavelength of 450 nm) or the darkness to investigate effect of light conditions on shoot elongation (Fig. 1b). Cultures with LED treatments were maintained at 16–25 C (day and night), with 30 lmol m-2 s-1 photosynthetic photon flux (PPF) under a 24-h photoperiod. After 4 months, in vitro young shoots with five leaves were used as explants in node cutting experiments (Fig. 1c, d). By this way, contamination of fungi and bacteria from substrates could be limited and the explants were harvested easily.
Experimental designEx vitro P. delenatii stem node elongation under different light conditionsThe shoots with 1.5–2.0 cm length derived from ex vitro plants grown in the greenhouse were transferred into light chambers with different conditions including 100 % blue LED (100B, at a wavelength of 450 nm), 100 % red LED (100R, at a wavelength of 660 nm), 90 % red LED ? 10 % blue LED (90R:10B, 90 % red light at a wavelength of 660 nm and 10 % blue light at a wavelength of 450 nm), 50 % red LED ? 50 % blue LED (50R:50B, 50 % red light at a wavelength of 660 nm and 50 % blue light at a wavelength of 450 nm) or the darkness to investigate effect of light conditions on shoot elongation (Fig. 1b). Cultures with LED treatments were maintained at 16–25 C (day and night), with 30 lmol m-2 s-1 photosynthetic photon flux (PPF) under a 24-h photoperiod. After 4 months, in vitro young shoots with five leaves were used as explants in node cutting experiments (Fig. 1c, d). By this way, contamination of fungi and bacteria from substrates could be limited and the explants were harvested easily.
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