摘要
The rice seeds of IR661 (indica); Yanjing 2 (japonica) and Shanyou 53 indica hybrid Fwere grown in 15 nursery trays (40×20×15cm~2 each), A water stress treatment was carried out at the leaf age 5 by excluding water for 120h. Leaf water potential (LWP) was determined with chamber pressure. Abscisic acid (ABA) content in rice leaves was measured with radioimmnoassay. The content of ABA in the leaves changed a little when LWP was larger than—0.02 MPa, but increased rapidly when LWP was lower than this value. It could be considered that the critical LWP for obvious accumulation of ABA in rice seedling leaves was about—0.02 MPa.
