关键词: 烟草, 烟草, 青枯病抗性, 主基因遗传

Abstract: In order to achieve sorghum deficit irrigation and reach the purpose of water-saving and non-drop production, it is necessary to understand and grasp the changes of yield traits under water stress at different growth stages of sorghum. In this study, a two-factor and four-level randomized block design was conducted. The results showed that the re-watering compensation effect was obvious under long period mild and moderate water stress and short period severe water stress in seedling stage, the water-saving efficiency reached 50.7%. Compared with that of CK, the yield of MMD15, MMD20 and MSD10 increased by 4.96%, 5.98% and 7.18%, respectively, and the difference reached the significance of 5%, the yield of MSD20 decreased by 1.88%. The re-watering compensation effect was not obvious under long period of mild and moderate and short period severe water stress in the jointing stage, the negative effect of water stress was greater than the positive effect of re-watering compensation, the water-saving efficiency reached 37.9%. Compared with that of CK, the yield of BMD5 to BSD5 decreased by 5.38%, 7.44%, 8.78% and 5.4%, respectively, and the difference reached the significance of 5%. The yield of BSD10 and BSD15 decreased by 20.9% and 22.45%, respectively, and the difference reached the significance of 1% . The water- saving efficiency reached 50.0% under mild and moderate water stress in the filling stage, but the difference of thousand grain weight was not significant. Thousand grain weigh of GSD5, GSD10 and GSD15 under severe water stress decreased by 20.0%, 20.8% and 24.4%, respectively, and the difference reached a significant level of 1%, which caused yield decrease of 15.2%, 15.7% and 16.2%, respectively. Compared with that of mild and moderate water stress, the thousand grain weigh under severe water stress also had the significance of 1%.