Ion gradients in xylem exudate and guttation fluid related to tissue ion levels along primary leaves of barley

Makiko Nagai, Miwa Ohnishi, Takeo Uehara, Mutsumi Yamagami, Eiko Miura, Mai Kamakura, Akira Kitamura, Shu Ichi Sakaguchi, Wataru Sakamoto, Teruo Shimmen, Hidehiro Fukaki, Robert J. Reid, Akio Furukawa, Tetsuro Mimura