Fig. 3From: Melatonin promotes adventitious root formation in apple by promoting the function of MdWOX11Morphological parameters of AR formation in tissue culture plantlets of Malus prunifolia for different categories of root diameter, according to the number, length, surface area, and volume of root. The ARs were classified into three groups based on root diameter: 0–2.0 mm, 2.0–5.0 mm and > 5.0 mmBack to article page