6Steudle E, Peterson C A. How does water get through roets[J]. J. Exp. Bot., 1998,49:775--788.
7Lo Gullo MA, Nardini A, Salleo S, et al. Changes in root hydraulic conductance(KR) of Olea oleaster seedings following drought stress and irrigation[J]. New Phytol, 1998,140:25--31.
8North GB, Nobel P S. Hydraulic conductivity of concentric root tissues of Agave deserti Engelm. under wet and drying conditions[ J] . New Phytol, 1995,130:47-57.
9North GB, Nobel P S. Changes in hydraulic conductivity and anatomy caused by drying and rewetting roots of Agave desertii (Agavaceae) [J]. Am. J . Bot. , 1991,78:906-915.
10Perumalla C J, Peterson C A. Deposition of Casparian bands and subefin lamellac in the exodermis and endodermis of young corn and onion roots[J]. Can. J. Bot., 1986,64:1873-1878.
