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Four different ratios of river sand, ceramic pellets, vermiculite and perlite (1:1), and field soil were selected as the substrates in this experiment, and four gradient levels of root waterlogging, half waterlogging, full waterlogging and normal were set to investigate the effects of different gradients of waterlogging stress on the root morphology of  Taxus chinensis  var.  mairei  seedlings under different substrates. In this study, the root anatomical structure of  Taxus chinensis  var.  mairei  under different waterlogging stress was observed by the paraffin section method. The roots of  T. chinensis  var.  mairei  were diarch, with no pith and resin canals. There was a large number of tannins in the pericycle of the aerial adventitious roots of seedlings adapted to waterlogging. Also, the endodermis has obvious casparian strip thickening, and there were 4-5 layers of large parenchymatous cells in the close to the inner side of the pericycle in the vascular cylinder, which could increase the storage capacity, and transport capacity of the root. Under the treatment of root waterlogging stress, the development of plant roots in the mixed substrate of vermiculite and, perlite was the earliest. Under half waterlogging stress,  T. chinensis  var.  mairei  seedlings treated with various substrates all could better adapt to the environment of waterlogging stress. Under the stress of fully waterlogging, the roots of seedlings planted in river sand substrate developed secondary growth.

phyton-international journal of experimental botany

Comparison of Morphological and Anatomical Characteristics of  Taxus chinensis  var.  mairei  Seedlings Root under Waterlogging Stress in Different Substrates