Simultaneous determination of five flavonoids components in different parts of Callistephus chinensis by HPLC Somatic Embryogenesis and Plantlet Regeneration of Hypocotyl Explants of Callistephus chinensis ‘Bouquet Scarlet’ Establishment of Plantlet Regeneration System from Leaves Explants for Callistephus chinensis‘Bouquet Scarlet’ Establishment of Plantlet Regeneration System from Leaves Explants for Callistephus chinensis‘Bouquet Scarlet’ Root nutrient foraging of morphological plasticity and physiological mechanism in Callistephus chinensis Proliferation and growth of plant fine roots and the influences from nutrient variation―implications from the split-root experiments of Ailanthus altissima, Callistephus chinensis and Solidago canadensis