ROL rates from roots were directly regulated by their growth conditions (Table 1). Compared to controls, total amount of ROL from entire roots were found to be significant lower when exposure
to salty solutions and high N deficient solution; while a low N deficiency tends to slightly increase ROL from roots. The results of ROL spatial pattern also showed that the salt directly reduced ROL from roots, especially in apical root regions; the control plants presented about 30 ng O2 cm2 min1 in apical root regions, however, the rates of ROL declined significantly to approximate 20 ng O2 cm2 min1 when exposed to 400 mM NaCl (Fig. 1).