Two experiments were conducted with 'Ponkan' mandarin and the 'Tahiti' acid lime grafted on Rangpur Lime cultivated in five litters pots. Water stress was applied to plants placed in growth chamber, under controlled temperature (25º C day/ 20º C night), and 16 hours photoperiod, with photosynthetic photons flux (PPF) of about 170 µmol m-2 s-1. In greenhouse conditions temperatures were ranging from 9,9º C (minimum) to 29,0º C (maximum) and PPF from 427 to 803 µmol m-2 s-1. Water stress did not induce the flowering of 'Ponkan' mandarin plants and the 'Tahiti' lime under growth chamber conditions. However the water stress favored the increase of flowering of 'Ponkan' plants and 'Tahiti' lime placed in the greenhouse conditions. The leaf hydric potential reduced with the water stresses imposed to the plants of 'Ponkan' mandarin and the 'Tahiti' acid lime; however, there were changes concerning the cultivars. Higher values were noted with 'Tahiti' lime.
Citrus; leaf hydric potential; floral induction
