（1College of Agriculture，Guizhou University，Guiyang 550025，Guizhou，China；2College of Horticulture Science and Engineering，Shandong Agricultural University，Tai’an 271018，Shandong，China）
Abstract：Taking Guizhou semi-wild tomato GZ-01 as rootstock，red fruit tomato R and pink fruit tomato P as scion，this experiment used 20% PEG-6000 solution as simulate drought stress to treat un-grafted（R，P，GZ-01），grafted（RGZ-01，PGZ-01）and self-grafted（RR，PP）tomato plants；and carried out analysis on the growth physiological indexes，stomatal opening and closing，defense enzyme activity，active oxygen accumulation and expression of MAPKs and ABA synthesis related genes．The results showed that under drought treatment，GZ-01 rootstock could enhance the activities of defense enzymes and antioxidant enzymes in grafted plants；reduce open state proportion of stomata and H2O2 and O2-. accumulation in leaf blades；and induce the expression of MAPKs and ABA-related genes in grafted plants，so as to enhance the drought tolerance of grafted plants．Drought tolerance was related to scion plants，no matter it was strong or weak．
