Drought is one of the most important abiotic stresses that adversely affect plant growth and productivity. Drought regulates a multitude of biochemical and physiological processes in plant system. It is necessary to understand the traits associated for identifying drought-resilient sorghum lines. A field experiment was conducted with 20 rabi sorghum genotypes to study the variation in physiological and key root traits that contribute the drought tolerance under irrigated and stress conditions. Genotypes, Phule Anuradha and RSV 2145 recorded early flowering (68 and 69 days, respectively) under the stress condition, while both STG 25 and RSV 2145 recorded 108 days for physiological maturity. Genotype RV 48 recorded significantly higher leaf area (1355 cm²) and leaf area index (2.01) than check M 35–1 (1288 cm² and 1.90, respectively) under the stress condition. The maximum relative leaf water status was recorded in M 35-1 (84.40%) under the stress condition, an indicator of wider adaptability. Genotypes CRS 67 and STG 44 recorded higher root length (56 cm and 55 cm, respectively) compared to check M 35–1 (40.67 cm) under the stress condition reflecting that root length helps in absorption of water from deep ground level. Root volume was significantly higher in Phule Suchitra and STG 21 (7.56 cm³ and 6.30 cm³, respectively) under the stress condition. The root dry matter was more in Phule Suchitra (8.83 g) followed by CRS 67 (7.73 g) and M-35–1 (5.03 g) under the irrigated condition. Under stress, M 35–1 recorded significantly higher root biomass (4.06 g) followed by STG 44 (3.78 g). The grain yield was maximum in Phule Suchitra (80.00 g) followed by Phule Anuradha (64.00 g) under the stress condition. The experiment concluded that the root traits indicate the adaptability of the genotypes for drought condition, and CRS 67, Phule Suchitra and STG 44 with higher root traits can further be used in the breeding programs for drought tolerance. Collectively, these results demonstrate that the role of physiological traits and root architecture development are key factors in understanding the interplay of drought stress.

干旱是对植物生长和生产力产生不利影响的最重要的非生物胁迫之一。干旱调节植物系统中的多种生化和生理过程。有必要了解与识别抗旱高粱品系相关的性状。对 20 个rabi sorghum基因型进行了田间试验，以研究在灌溉和胁迫条件下有助于耐旱的生理和关键根系性状的变化。基因型、Phule Anuradha 和 RSV 2145 在胁迫条件下记录了早期开花（分别为 68 天和 69 天），而 STG 25 和 RSV 2145 的生理成熟期均为 108 天。基因型 RV 48 记录的叶面积显着增加（1355 cm ²) 和叶面积指数 (2.01) 比在胁迫条件下检查 M 35–1（分别为1288 cm ^{2和 1.90）。}在胁迫条件下，M 35-1 (84.40%) 记录了最大相对叶片水分状态，这是更广泛适应性的指标。与 M 35-1（40.67 cm）相比，基因型 CRS 67 和 STG 44 记录的根长（分别为 56 cm 和 55 cm）在反映根长有助于从深层地面吸收水分的胁迫条件下更高。^{Phule Suchitra 和 STG 21（7.56 cm 3}和 6.30 cm ³）的根体积显着增加，分别）在应力条件下。在灌溉条件下，Phule Suchitra (8.83 g) 的根干物质较多，其次是 CRS 67 (7.73 g) 和 M-35-1 (5.03 g)。在胁迫下，M 35-1 的根生物量显着增加（4.06 g），其次是 STG 44（3.78 g）。在胁迫条件下，Phule Suchitra (80.00 g) 的粮食产量最大，其次是 Phule Anuradha (64.00 g)。试验得出的结论是，根性状表明基因型对干旱条件的适应性，具有较高根性状的CRS 67、Phule Suchitra和STG 44可进一步用于耐旱性育种计划。总的来说，这些结果表明生理性状和根结构发育的作用是理解干旱胁迫相互作用的关键因素。