Abstract: Using polyethylene glycol PEG6000 with osmotic potential from－0. 2 MPa to－0. 4 MPa as simulating water stress,experiment on germination of seeds of eight tomato varieties was done,effections of osmotica stress on tomato seed germination were researched. The result indicated that the higher the osmotic concentration was,the greater degree of coercion stress on seed germination was,all the materials could not germinate under－0. 4 MPa osmotic potential,the relative germinative energy,relative germination rate,relative germination index,relative vigor index,embryo roots growth were inhibited in diferent degrees under－0. 2 MPa and－0. 3 MPa osmotic potential,germination drought resistance index (GDRI) under two kinds of concentration were positively correlated (r =0. 759^* ). By cluster and correlation analysis of GDRI and the other indices,we thought that PEG-6000 with osmotic potential from－0. 2 MPa to－0. 3 MPa could be used for drought resistance identification,it cleared identification indexes system of drought resistance at germination stage,laid the foundation of comprehensively evaluated drought resistance of tomoto varieties.

Key words: Tomota, Germination stage, Identification index for drought resistance, Osmotic stress

CLC Number: 

• S641.2