9份具源511S背景的早稻两用不育系主要农艺、品质性状和异交特性研究OACSTPCD

To explore the potential application value of early rice dual-purpose male sterile lines improved based on Yuan 511S,the main agronomic traits,outcrossing characteristics,blast resistance and appearance quality traits of the nine im-proved male sterile lines were investigated.The results showed that the plant morphological characters such as plant type compactness,tillering ability,spikelet number per panicle,upper clover length and width of improved male sterile lines ba-sically maintained the characteristics of Yuan 511S,and some lines were improved in some characters.The sowing duration of 9 dual-purpose genic male sterile lines as early rice was 83-92 d,of which 8 were 0-6 d shorter than that of Yuan 511S.the variation directions of the improved male sterile lines were different in glume opening period,glume tip distance and glume opening angle,the total exposure rate of stigma was lower than that of background parent Yuan 511S,and the outcrossing seed setting rate of 21YSF21 and 22SF01 was significantly higher than that of Yuan 511S.The blast susceptibil-ity grade of improved male sterile lines was 1.1-4.8,of which 7 reached the level of moderate resistance or resistance,and the ratio of grain length to width and brown rice length-width ratio of improved male sterile lines were 4.2-5.1 and 3.6-4.2,respectively,which were significantly higher than those of Yuan 511S.the chalky grain percentage and chalkiness de-gree were significantly lower than that of Yuan 511S,and the chalkiness degree of 3 male sterile lines was less than 3.0.Comprehensive analysis showed that 21YSF10,21YSF21,22SF15 and 22SF16 had shorter growth period,ideal plant type,better outcrossing characteristics,moderate blast resistance and less than 5%chalkiness of rice,which is expected to provide new male sterile line resources for the preparation of high quality early hybrid rice combinations.