Changes in the Vascular Cylinder of Wild Soybean Roots Under Alkaline Stress
NIU Lu, LU Jing-mei, WU Dong-mei, LI Yan , GAO Ting-ting (1College of Natural Resources and Environment, Northwest AF University, Yangling 712100, P.R.China 2School of Agriculture, Henan University of Science and Technology, Luoyang 471003, P.R.China 3State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest AF University, Yangling 712100, P.R.China)
Changes in the vascular cylinder of wild soybean (Glycine soja Sieb. et Zucc) roots under alkaline stress were investigated in an experiment that applied 90 mmol L-1 alkaline stress for 10 d at the five-trifoliate plant growth stage in Huinan County, Jilin Province, China. Root samples were collected and paraffin-cut sections were made, and the root structure was observed under an optical microscope. There were significant changes in the vascular cylinder of G. soja roots under alkaline stress. Root diameter was reduced and the vascular cylinder changed from tetrarch to triarch pattern. Alkaline stress resulted in reduced, diameters of root vessels, and a large amount of residual, alkaline solution was stained cyaneous in vessels. The paratracheal parenchymatous cells of the vessels were large and there was little secondary xylem. Thus, alkaline stress caused structural changes in the vascular cylinder of G. soja.
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