Abstract: Low-temperature hazard is a key problem for direct-seeding rice in the middle and lower reaches of Changjiang River region In this paper,the possible role of seed soaking and flooding in ameliorating rice plants resistance to low temperature in a bud with a leaf stage was evaluated in an artificial climate-room,using Xiang-zaoxian24(V1)and Zhuliangyou2(V2).Seed treatments included A1(drug-soaked),A2(drug-dressed),A3(water-soaked)and flooding treatments,B1(moist non-flooded),and B2(flooded).The test results showed that under low temperature conditions,the seedling rate increased significantly compared with A3 maintainedas a control,36.61% and 33.57% for V1 and V2,respectively.All seed soaking treatments resulted in better seedling quality,lower membrane permeability,and lower MDA concentration.Considering flooding treatments,a significant increase of seedling rate was found with B1,51.2% and 19.6% for V1 and V2,respectively,compared to B2.Of all the treatments,A1B1 combination was found to building apopulation with high available seedling rate,good seedling quality and fast growth vigor,and to protecting seedlings from low temperature damages during the seedling stage.

Key words: Rice（OryzasativaL.）, Directseeding, Lowtemperature, Seedsoaking, Flooding, Available seedling rate, Seedling quality

CLC Number: 

• S511.048