基于土壤水分梯度鉴定法的栽培稻抗旱标识品种筛选

利用土壤水分梯度鉴定法，对20份在田间表现不同抗旱性的栽培稻进行了抗旱性研究。结果表明，干旱处理24 d后，正常和干旱处理的土壤含水量分别为42.0%和7.9%，在同一田块实现正常供水和干旱处理，可鉴定栽培稻的抗旱性。以抗旱指数为指标，把20份栽培稻划分为高抗、抗、中抗、中感、感5个抗旱级别。根据抗旱指数和综合农艺性状，筛选出了IR55459-05(高抗)、MARAVILHA(抗)、MONOLAYA(中抗)、IR30358-084-1-1(中感)和IR7790-18-1-2(感)5个抗旱级别的标识品种。这一套栽培稻抗旱鉴定流程和标识品种，为水稻节水抗旱研究提供了参考。

Screening Marker Varieties with Drought Resistance in Cultivated Rice (Oryza sativa L.)Using Identification Method with Soil Moisture Gradient

Twenty rice varieties with different drought resistance (DR) in the field were selected to be revaluated on the DR degree using the identification method with soil moisture gradient. After 24 days drought stress treatment, the soil water contents in normal irrigation and drought stress treatments were 42.0% and 7.9%, respectively. The results showed that both normal irrigation and drought stress treatments in the same field were achieved at the same time. These varieties were classified into five groups based on drought index. According to drought index and major agronomic performance, five “marker variety” were selected: IR55459-05 (high resistance), MARAVILHA (resistance), MONOLAYA (medium resistance), IR30358-084-1-1 (medium susceptible) and IR7790-18-1-2 (susceptible). The marker varieties and the standard DR screening process can be used as a reference rice drought resistance studies and breeding in the future.