The ion levels in the epidermal bulliform cells of epidermis, mesophyll cells and cells of the vascular bundle sheath of four ecotypes of reed (Phragmites australis (Cav.) Trin. ex Steud.) were determined by means of X-ray microanalysis. The results indicated that higher K+, Na+, Ca2+, Mg2+ and Cl- were distributed in the vascular bundle sheath cells than in mesophyll cells and epidermal bulliform cells of the swamp ecotype. Higher Ca2+ was found in the bulliform cells than in mesophyll cells and vascularbundle sheath cells, higher Mg2+ in the mesophyll cells and higher K+, Na+ and Cl- in the vascular bundle sheath cells of the dune ecotype. Higher Na+ and Mg2+ was determined in the mesophyll cells than in the bulliform cells and vascular bundle sheath cells, and higher K+, Ca2+ and Cl- in the vascular bundle sheath cells of the light salt meadow ecotype. In the heavy salt meadow ecotype, higher Na+ and Mg2+ were accumulated in the bulliform cells than in mesophyll cells and vascular bundle sheath cells, but higher K+, Ca2+ and Cl- in the mesophyll cells. Furthermore, the distributional conditions of the above five ions in leaf cells of the four ecotypes and their significance in the physiological adaptation of reed to habitat were discussed in detail.
四种生态型芦苇叶中离子分布对生境的生理适应
全 文 ：